Service manual

ManualsBrandsSharp ManualsAll in One PrinterAR-810

CONTENTS

Parts marked with “ ” are important for maintaining the safety of the set. Be sure to replace these parts with

specified ones for maintaining the safety and performance of the set.

SHARP CORPORATION

This document has been published to be used

for after sales service only.

The contents are subject to change without notice.

SERVICE MANUAL

CODE: 00ZAR810//F1E

DIGITAL COPIER

AR-651

MODEL

AR-810

1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

2. COMPONENT LAYOUT & FUNCTIONS . . . . . . . . . . . . . . . . . . . . 2-1

3. COPY PROCESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

4. GENERAL OPERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

5. CONTROL PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

6. SCANNING SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

7. IMAGE PROCESSING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

8. LASER & OPTICAL UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

9. PAPER FEEDING SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

10. PROCESS SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1

11. DRUM/CLEANER UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1

12. DEVELOPER UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1

13. TRANSFER/TRANSPORT UNIT . . . . . . . . . . . . . . . . . . . . . . . . . 13-1

14. FUSER UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-1

15. EXIT/REVERSING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-1

16. RADF (DOCUMENT FEEDER) . . . . . . . . . . . . . . . . . . . . . . . . . . 16-1

17. POWER SUPPLY UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-1

18. PRINTED WIRING BOARDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-1

19. UNPACKING AND INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . 19-1

Summary of content (342 pages)

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SERVICE MANUAL CODE: 00ZAR810//F1E DIGITAL COPIER MODEL AR-651 AR-810 CONTENTS 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 COMPONENT LAYOUT & FUNCTIONS . . . . . . . . . . . . . . . . . . . . 2-1 COPY PROCESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 GENERAL OPERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 CONTROL PANEL .
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GENERAL PRECAUTIONS REGARDING THE INSTALLATION AND SERVICE FOR THE COPIER AR-651/810 The installation and service should be done by a qualified service technician. 1. Transportation/Installation • When transporting/installing the copier, move it by the casters while lifting the stoppers. The copier is quite heavy and weighs approximately 200 kg (441 lb), therefore use caution when handling it. • Be sure to use a dedicated line with AC 115V or 120V/20A (220V, 230V, 240V/10A) or more for its power source.
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. Main Service Parts for Safety • The breaker's, door switch's, fuse's, thermostat's, thermofuse's, thermistor's, etc. are particularly important for safety. Be sure to handle/install them properly. Do not allow a short circuit to occur to maintain the safety rating of the equipment replace these parts with only genuine Sharp parts of the same type and makers. 4.
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CONTENTS 1. 2. 3. 4. 5. 6. 7. SPECIFICATIONS 1. 1. Specifications . . . . . . . . . . . . . . . . . . 1-1 1. 2. Accessories . . . . . . . . . . . . . . . . . . . 1-13 1. 3. Options . . . . . . . . . . . . . . . . . . . . . . 1-13 1. 4. Supplies. . . . . . . . . . . . . . . . . . . . . . 1-14 1. 5. System List . . . . . . . . . . . . . . . . . . . 1-15 COMPONENT LAYOUT & FUNCTIONS 2. 1. Sectional View. . . . . . . . . . . . . . . . . . 2-1 2. 2. Electric Parts Layout . . . . . . . . . . . . . 2-5 2.
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14. FUSER UNIT 14. 1. General Description. . . . . . . . . . . . . 14-1 14. 2. Operation. . . . . . . . . . . . . . . . . . . . . 14-1 14. 3. Functions. . . . . . . . . . . . . . . . . . . . . 14-2 14. 4. Heater Control Circuit . . . . . . . . . . . 14-4 14. 5. Fuser Motor Drive . . . . . . . . . . . . . 14-11 14. 6. Disassembly and Replacement. . . 14-13 15. EXIT/REVERSING UNIT 15. 1. General Description. . . . . . . . . . . . . 15-1 15. 2. Operation. . . . . . . . . . . . . . . . . . . . . 15-1 15. 3.
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1. SPECIFICATIONS 1.1. Specifications 1.1.1.
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1.1.2. Basic specifications A.
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C. Original Max. size A3 or LD Kind Sheet, cubic material, book Original size detection Glass surface: Yes Note 1: Fixed detection system with the RADF open RADF: Yes Note 1: Document width and length are detected in RADF paper feed. Note 2: Only the first paper is detected except when mixed sizes of sheets are loaded. Allowable original size for auto detection Fixed size AB series: A3, A4, A4-R, A5-R, B4, B5, B5-R LT series: LD, LG, LT, LT-R, ST-R D.
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E. Paper feed Paper feed means Cassette, 2 steps Tandem LCF Manual feed Capacity Cassette: 500 sheets (Loading height: 55mm or less) Tandem LCF: 1250 x 2 sheets (Loading height: 137mm or less) Manual feed: 100 sheets (Loading height: 11mm or less) Manual feed start START key start Priority paper feed means Yes Tandem LCF Note 1: Priority can be switched to the other paper feed means by date input in the adjustment mode.
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(2) Selected magnification ratio a. AB series Paper Document A3 A3 B4 FOLIO A4 B5 A5 100 86 71 71 61 50 B4 115 100 82 82 71 57 FOLIO 127 110 100 90 78 63 A4 141 122 100 100 86 71 B5 163 141 115 115 100 82 A5 200 173 141 141 122 100 LD COMP LG LT ST LD 100 82 78 65 50 COMP 108 100 84 78 54 LG 121 100 100 78 60 LT 129 119 100 100 65 ST 200 165 154 129 100 b.
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K. Charger wire cleaning Charger wire cleaning Automatic cleaning system Note: The charger wire is cleaned. L. Special functions Interruption Pre-heating Sleep Auto off Yes Yes Note 1: Automatic pre-heat function can be set in the adjustment mode. Note 2: Time can be set in the adjustment mode. (Setup: 15, 20, 30, 45, 60 min) Note 3: The fusing unit temperature in pre-heating can be changed in the adjustment mode.
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Sheet insertion mode Yes (following 2 modes) Weekly timer Pre-heat start Pre-heat copy (1) White sheet insertion mode (2) Copy paper insertion mode Yes Yes Yes Max. 6 jobs. Note 1: The next copy job mode setup can be made when document scan is completed. When the START key is pressed, preceding entry of document is started. Note 2: In the 6th job, the machine is in the scan reservation state. After completion of copy 1 job, scan is automatically started.
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M. Edit functions Continuous paper copy Yes Edge erase Yes Note: The edge erase priority mode Factory setup: No priority can be selected by the adjustment mode. Binding margin (Image shift) Yes Trimming, masking Yes 2 in 1 Yes 4 in 1 Yes Normal position for document set N. Tab paper Paper feed means Supported only for manual paper feed and the second stage cassette. Paper feed direction The tab side must be on the rear side when feeding.
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P. Operation panel Operation keys Status display Hard key Note 1: The number of keys is 19 as follows: ENERGY SAVER INTERRUPT CLEAR ALL (CA) CLEAR STOP START PRINTER/NETWORK COPY 0 to 9 (10 keys) JOB STATUS HELP Displayed with the message display and LED Message display Note 1: There are following 9 LEDs.
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R. Noises When ready 45dB (A) or less When continuous copying 65dB (A) or less S. Complying standards Safety standards Interruption wave standards 1) Electric appliances safety regulation 2) S mark 3) UL 4) CSA (C-UL) 5) CDRH 6) TUV 7) CE mark 1) VCCI 2) FCC (IC) 3) CE mark 4) C-TICK (Australia) 5) Radio wave regulations 6) Domestic harmonic wave T. Power source Power voltage, frequency Power consumption Power cord 100V-50/60Hz, 115V-50/60Hz, 220 to 240V-50/60Hz 2.
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W. Maintenance (1) Periodic inspection Execution interval AR-651 AR810 460,000 sheets 500,000 sheets X. Automatic document feeder Automatic document feeder Standard provision (1)Functions Functions Automatic separation and feed of loaded documents a) Automatic magnification ratio/paper selection b) Duplex documents supported c) SADF/ADF Allowed documents Fixed size AB series: A3, A4, A4-R, A5-R, B4, B5, B5-R LT series: LD, LG, LT, LT-R, ST-R Kind: Quality paper Max.
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Z. Tandem LCF Standard provision Kind Single paper feed (Right), single shift (Left) type large capacity paper feed unit Paper supply system Front loading type No separation of right and left (Overall pull-out) Max. loading capacity Loading height: 137mm or less x 2 stages (1250 x 2 sheets, paper thickness 0.106mm, 80 g/m² / 20 lbs paper) Allowable paper size AB series: A4 Paper kind PPC paper LT series: LT (OHP films, gum labels, and special paper cannot be used.
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1.2. Accessories Operation manual Drum Drum cover Operation Manual pocket Spacer for original tray Rear edge guide for tab paper Maintenance management table (CCASZ0067FC02) Delivery and installation report (TCADZ1510FCZZ) (Australia) MSDS card (TCADZ) (North America, Europe) Warranty paper for Australia (TGANE1001QCZB) (Australia) cover-screws, 3 pcs. 1.3. Options ITEM MODEL Large capacity paper feed tray AR-LC4 Finisher AR-F11 Punch unit NOTE AR-F12 Saddle stitch finisher AR-PN3A 2 holes (φ6.
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1.4. Supplies SEC/SECL/(LAG) No. Item 1 Toner CA (Black) 2 Developer 3 Drum Life Model Name 240k (60K x 4) 460K (AR-651) 500K (AR-810) 460K (AR-651) 500K (AR-810) AR-810MT Packing Unit 1 AR-810ND 4 AR-810DR 10 Content Toner (Toner; Net Weight 1350g) Developer (Developer; Net Weight 1500g) Drum x4 x1 x1 Remarks * Life: A4 size at 6% AC MT=NT x 4 Note 1) Master/individual cartons are printed in 2 languages (English/French).
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1.5.
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2. COMPONENT LAYOUT & FUNCTIONS 2. 1.
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1 Exposure lamp 39 Cleaning roller (felt) 2 Reflector 40 Upper fuser roller thermistor 3 Mirror 1 41 Thermostat 4 Mirror 2 42 Pressure roller thermistor 5 Mirror 3 43 Engine exit rollers 6 Original glass 44 Reverse/exit switching gate 7 Lens 45 Reverse path rollers 1 8 CCD driving PC board 46 Reverse path rollers 2 9 Scanner control PC board SLG 10 Drum 47 Transfer rollers 1 11 Drum thermistor 48 Transfer rollers 2 12 Charger wire cleaner 49 Transfer rollers 3 1
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[B] Rear side view (Drive system) 4 3 2 1 6 5 14 18 9 7 8 15 10 19 16 11 12 13 17 AR-651/810 COMPONENT LAYOUT & FUNCTIONS 2 - 3
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1 Scanner motor 2 Drive pulley 3 Drive belt 4 Driven pulley 5 Drum motor 6 Developer unit motor 7 Registration motor 8 Fuser motor 9 Web motor 10 Exit motor 11 Reverse motor 12 LCF tray-up motor 13 LCF end fence motor 14 Cleaner brush motor 15 TX belt lift cam motor 16 Tray 1 & 2 paper lift motor 17 Paper feed motor 18 TX belt drive motor 19 Waste toner transport motor (TX belt) AR-651/810 COMPONENT LAYOUT & FUNCTIONS 2 - 4
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2. 2.
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[B] Scanner unit (B-1) Motor/Exposure lamp EXP M31 M1 Rear side (B-2) Sensor/Switch S1-2 S1-1 S1-3 S1-5 S1-4 A4 series S2 Rear side S1-2 S1-3 S1-5 LT series S1-4 S2 Rear side AR-651/810 COMPONENT LAYOUT & FUNCTIONS 2 - 6
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(B-3) PC board CCD INV SLG Rear side (B-4) Other parts DHR DHL THMO4 Rear side AR-651/810 COMPONENT LAYOUT & FUNCTIONS 2 - 7
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[C] Laser unit GLV LDR1 M2 LDR2 SNS PLG Rear side [D] Transfer/Transport unit THMO3 DHT FUSE S5 S4 S3 CLT3 Rear side AR-651/810 COMPONENT LAYOUT & FUNCTIONS 2 - 8 CLT2 CLT1
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[E] Fuser unit M30 IH M3 IHCOIL S6 THM1 THMO2 S7 THM2 THMO1 THM5 THM3 Rear side AR-651/810 COMPONENT LAYOUT & FUNCTIONS 2 - 9
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[F] Copier unit (F-1) Motor/Fan M19 M18 M17 M25 M20 M24 M16 M15 M26 M21 M22 M27 M14 M28 M13 M23 M29 M12 M11 M10 M9 M8 M7 M4 M5 M6 M32 Rear side AR-651/810 COMPONENT LAYOUT & FUNCTIONS 2 - 10
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(F-2) Clutch/Solenoid SOL2 SOL1 SOL3 CLT4 CLT5 CLT6 SOL5 CLT8 CLT7 CLT10 CLT9 CLT11 SOL4 Rear side AR-651/810 COMPONENT LAYOUT & FUNCTIONS 2 - 11
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(F-3) Sensor/Switch S52 S14 S17 S16 S15 S19 S49 S50 S51 S21 S26 S27 S28 S29 S32 S33 S34 S35 S25 S38 S39 S40 S41 S18 S24 S20 S31 S30 S37 S36 S10 S23 S11 S22 S42 S13 S43 S44 S47 S45 S46 Rear side AR-651/810 COMPONENT LAYOUT & FUNCTIONS 2 - 12 S12
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(F-4) PC board SYS HDD MOT LGC HVT MOT2 Rear side AR-651/810 COMPONENT LAYOUT & FUNCTIONS 2 - 13
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(F-5) Other parts THM4 S8 S9 S48 ERS NF1 BRK1 PS Rear side AR-651/810 COMPONENT LAYOUT & FUNCTIONS 2 - 14
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[G] Reversing automatic document feeder SSOL DFOPSW TRYS SMOT COPSW LMOT DFLG TLMOT TRVR RMOT FMOT SOES a b SSBS REGS APS ITFS c LLMTS ESSOL SIZE2 SIZE1 SIZE3 COPS ULMTS EMPS LNGS READS LOES DFOPNS LSOL AR-651/810 COMPONENT LAYOUT & FUNCTIONS 2 - 15
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2. 3.
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Symbol M22 Name ADU-FAN-MOT1 Function Remarks Cooling down the reverse section (F-1) Cooling down the reverse section (F-1) Cooling down of the exit section (F-1) Sucking of ozone (F-1) Cooling down of the laser unit (F-1) Cooling down of the copier inside (F-1) Cooling down of the copier inside (F-1) DEV-FAN-MOT Sucking of the toner in the developer (F-1) Developer unit fan motor unit M30 IH-FAN-MOT IH fan motor Cooling down of the IH board M31 SLG-FAN-MOT Cooling down of the SL
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(2) Sensors and switches Symbol S1-1 – S1-5 Name Function Remarks APS 1-5 Automatic original detection sensor Original size detection (B-2) S2 HOME-SNR Carriage home position sensor Carriage home position detection (B-2) S3 TR-SNR 1 Transport sensor 1 Paper detection at the duplex paper transport path [D] S4 TR-SNR 2 Transport sensor 2 Paper detection at the duplex paper transport path [D] S5 TR-SNR 3 Paper detection at the duplex [D] Transport sensor 3 paper transport path S6 WEB-
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Symbol Name Function Remarks S23 TR-BELT-SW 2 Transfer belt contact switch Transfer belt contact position detection (F-3) S24 TNR-FULL-SNR Waste toner bottle full detection sensor Used toner full detection (F-3) S25 COV-R-SNR Feed cover sensor Right door feed cover open/close detection (F-3) S26 CST1-TR-SNR 1st cassette transport sensor 1st cassette paper detection (F-3) S27 CST1-TRY-SNR 1st cassette tray position detection (F-3) 1st cassette paper detection (F-3) CST1-EMP-SNR Det
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Symbol S45 S46 S47 S48 S49 S50 Name Function EMP-SNR-SS Tandem LCF paper position Standby side empty sensor detection at the standby side END-F-HP-SNR Tandem LCF end fence home End fence home position sensor position detection Remarks (F-3) (F-3) PR-MST-SS Tandem LCF detection of paper Standby side paper mis-stacking sensor stacking error at the standby side (F-3) HTR-SW Detection of the fuser unit presence Fuser unit switch or absence SFB-COV-SNR Open/close detection of the bypass By
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(3) Electromagnetic spring clutches Symbol Name Function Remarks CLT1 TR-DRV-CLT Duplex paper transport driving clutch Driving of the reversed paper transport section [D] CLT2 REV-TR1-CLT Duplex paper transport clutch 1 Reversed paper transporting [D] CLT3 REV-TR2-CLT Duplex paper transport clutch 2 Reversed paper transporting [D] CLT4 MDL-TR-CLT Intermediate transport clutch Paper transporting (F-2) CLT5 SFB-FEED-CLT Bypass feed clutch Driving of the bypass pickup roller (F-2) CLT6
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Symbol MOT MOT2 Name Function PWA-F-MOT Driving of the drum motor and Motor driving PC board transfer belt motor PWA-F-MOT2 Driving of the reverse motor Remarks (F-4) (F-4) Motor driving PC board 2 PLG PWA-F-PLG Control of the printing section and Laser control PC board (PLG board) image processing [C] (5) Heaters and lamps Symbol Name Function Remarks EXP LP-EXPO Exposure lamp Exposing of original to the light (B-1) DHR DNP-HTR-R Scanner damp heater (R) Preventing of the condensat
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(8) Others Symbol Name Function Remarks INV INV-EXP Lamp inverter Control of the exposure lamp (B-3) HDD HDD Hard disk Storing of the image data (F-4) GLV MIR-GLV Galvanometer mirror Control of the laser vertical position PS PS-ACC Switching power supply DC power supply THMO1 THERMO-C-HTR Center thermostat Preventing of the fuser unit over-heating [E] THMO2 THERMO-S-HTR Side thermostat Preventing of the fuser unit over-heating [E] THMO3 THERMO-DAMP-HTR Dump heater thermostat Prev
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2. 4.
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(4) Switches and sensors Symbol COPSW Name COV-OPN-SW Function Interrupts power to the DF motors Remarks Micro switch Cover open/close switch when the top cover is open DFOPSW DF-OPN-SW Interrupts power to the DF motors RADF open/close switch when the DF unit is up DFOPNS DF-OPN-SNS RADF open/close sensor Detecting if RADF is opened/closed APS AUTO-PS-SNS APS operation sensor Detecting the angle opened and Semiconductive switching ON/OFF of the APS sensor photosensor COPS COV-OPN-SNS Cover o
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HDD 16 LCD 0 8 4 ASIC 32 1 2 3 4 5 6 7 8 9 CLR COPY ASY-COMPANE AR-651/810 COMPONENT LAYOUT & FUNCTIONS 2 - 26 LCF IPC TANDEM LCF PWA-F-SYS-340 SDRAM NVRAM RTC IDE-I/F or PFC 8 Serial-I/F 8 ASIC 32 32 PCI-Bus Serial-I/F Flash ROM SRAM Image Data Image Data 32 32 8 Flash ROM Gate Array 8 32 32 16 32 M-CPU SRAM SDRAM 32 32 16 Flash ROM Download JIG Serial-I/F NVRAM Flash ROM SRAM PWA-F-LGC-340 32 CPU PWA-F-SCN-340 Printer Controller ADR/DAT-Bus L
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2. 6. Disassembly and Replacement of Covers and PC boards 2. 6. 1. Covers [A] Front cover/Front side right inner cover (1) Open the front cover. (2) Pull out 2 L-shaped pins and take off the front cover. L-shaped pin Front cover (3) Remove 2 screws and take off the front side Front side right inner cover right inner cover. [B] Feed side rear cover/Feed side top cover/ Feed side center cover Feed side top cover Feed side rear cover (1) Remove 1 screw and take off the feed side rear cover.
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[D] Rear cover (1) Loosen 1 screw (shown by a white arrow), remove 6 screws, release 2 hooks and take off the rear cover. Hook [E] Right top cover Right top cover (1) Remove 1 screw and take off the right top cover. [F] Left top cover Left top cover (1) Remove 1 screw and take off the left top cover.
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2. 6. 2. PC boards [A] System control board (SYS board)/Hard disk/ Rear feed side inner cover Rear exit side inner cover Logic board (LGC board) (1) Remove the rear cover. (2) Disconnect 1 connector. (3) Remove 2 screws (shown by 2 white arrows), loosen 14 screws and take off the rear feed side inner cover (plate cover). (4) Remove 1 screw (shown by a white arrow), loosen 8 screws and take off the rear exit side inner cover (plate cover).
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(3) Disconnect 19 connectors to the LGC board. (4) Remove 6 screws and take off the bracket LGC board with the LGC board. (5) Disconnect 6 connectors, remove 1 screw, High-voltage transformer release 3 lock supports and take off the high voltage transformer. Lock support [C] Power supply unit (1) Remove the SYS board, hard disk and LGC board with the bracket. (2) Remove 4 screws and take off the bracket of the power supply unit. (3) Disconnect 1 link connector.
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3. COPY PROCESS 3. 1. General Description Image processing Original exposure Xenon lamp 29W 2 Scanning CCD 600dpi, 7500pixel 3 Writing 4 Semiconductor laser Pw=3.
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Laser beam Surface Charge Prsipatron OPC Resulting Hall OPC Current Gen. AL core 3. 2. Details of Copy Process (1) OPC drum The OPC drum has two layers, an outer and an inner layer. The outer layer is a photovoltaic layer made of OPC layer Aluminum conductive base an organic photovoltaic carrier (OPC). The inner layer is an aluminum conductive base in a cylindrical form.
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(2) Charging Main charger Charging is a process of applying a charge uniformly to the photoconductive drum surface. The charger wire produces a negative corona discharge, which is controlled by the grid so that the Rotation of drum drum surface is uniformly charged with negative potential. The surface potential on the drum is determined by the grid potential and controlled to a specifed value by the grid control circuit as determined by the proc- Discharge ess controll system.
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(4) Writing Writing is a process of converting the image signals Image processing section sent from the image processing section into optical signals and exposing the drum surface to the light. Laser Drive board Semiconductor laser elements convert image signals sent from the image processing section into optical signals (laser emission) and exposes the Polygonal mirror drum surface to the light to form an electrostatic Semiconduc- latent image on it.
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• Developer material Carbon (5~10%) The developer material is a mixture of toner and carrier. The toner is charged to negative polarity and the carrier to positive polarity, due to the friction with Ferrite 5~20µm each other caused by mixing. Toner : Mainly consists of resin and carbon. Carrier : Consists of ferrite and resin coating on its Resin (90~95%) [Toner] surface to provide consistent frictional elec- 30~100µm trification.
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Additional Explanation The life of the toner cartridge (number of copies) varies depending on the following conditions. 1. Coverage of originals (printing image ratio of the original size) and density of original background 2. Size and density of originals 3. The existence of solid black when making copies (when a book is copied and the original cover is partially open) 4. Temperature and humidity in the room when making copies 5.
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(6) Transfer/Separation Drum Transfer: Transfer is a process of transferring the toner image (visible image) formed on the drum surface onto the paper. An electric charge applied by the high voltage power Transfer belt supply flows to the transfer belt from the power supply roller. Then it flows to the paper and OPC drum. The toner, which has been developed on the Paper drum's surface, is transferred to the paper by electrostatic attraction.
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(7) Fusing Fusing is a process of melting and fixing the toner Fuser roller on the paper. Method : The melting point of the toner (main Paper ingredient: resin) is 100~110°C. 훹 (Heat) The toner is melted by the heat of the surface of the fuser roller. + Pressure (Pressure) The pressure roller is pressed against the fuser roller by the springs to increase adherence of the melted toner to the paper.
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(9) Discharging Discharging is a process of eliminating any (–) charge remaining on the OPC drum before the next Dischage LED array charging process begins. If discharging does not occur, the following phenomenon could occur: Drum The (–) charge remains on the photoconductive drum. 훹 Uneven charge is applied to the drum during the next copy. 훹 The next copy has a double image. (Preceding image appears.) Solution : Expose the entire surface of the OPC drum to the light by the discharge LED array.
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3. 3. Comparison of Copy Process to AR-650/800 Process 1. Photoconductive drum AR-650/800 OD-6570 (OPC drum) AR-651/810 OD-6510 (OPC drum) (1) Sensitivity Highly sensitized drum Same as AR-650/800 (2) Surface potential –650 V (grid voltage –720V) –700 V (grid voltage –733V) 2.
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Process AR-650/800 AR-651/810 12.
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4. GENERAL OPERATIONS 4. 1. Overview of Operation Copier operation Operation during warming-up, pre-running and standby Automatic feed copying by pressing [START] key Copying operation Bypass copying Interrupt copying 4. 2. Operation 4. 2. 1.
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4. 2. 2. Standby state (ready for copying) • Keys on control panel enabled • When no key is pressed for a certain period of time: ~ Set number “1” and reproduction ratio “100%” displayed and copier returning to normal standby state 4. 2. 3.
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(7) Paper discharging • Exit sensor detecting passing of paper trailing edge • Main charger, developer bias and discharge lamp turned OFF • Each operation of drum, transfer belt, fuser unit and developer unit stopping and each fan returning to standby mode rotation • “READY” displayed and copier entering standby mode AR-651/810 GENERAL OPERATIONS 4 - 3
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Reverse rotation AR-651/810 GENERAL OPERATIONS 4 - 4 Exit sensor Discharge lamp Developer bias Main charger MVDEN signal Registration motor Registration sensor 1st cassette feed sensor 1st cassette feed clutch Drum motor Exposure lamp Scanner motor Forward rotation 22 0 260 260 430 830 260 890 830 220 250 236 536 1270 1280 1365 1365 1423 1780 1830 1790 1906 2470 2980 3330 3240 3680 4040 (ms) Timing chart for copying one A4 sized sheet fed from the 1st cassette
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4. 2. 4. Bypass copying (1) Paper inserted into bypass feed tray.
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4. 3. Abnormality Detection When an abnormality occurs in the copier, a symbol corresponding to the type of the abnormality is displayed to draw the operator’s attention. 4. 3. 1. Abnormality classification A) Abnormalities which can be cleared without resetting the door switch (1) Add paper (2) Paper misfeed in bypass (3) Set key copy counter B) Abnormalities which cannot be cleared without resetting the door switch.
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• When power is turned ON or feed unit initializing is operated: ↓ Presence or absence of paper detected Tray motor ON ~ Tray going up When tray-up sensor is not turned ON within a certain period of time: ↓ Tray being abnormal “Add paper” displayed regardless of paper being present ↔ or not Turn ON and OFF the power to clear this condition.
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A-2) Bypass misfeed ( ) • When doing a bypass feeding: Bypass feed pickup solenoid turned ON ↓ Registration sensor turned ON * When the registration sensor is not turned ON after a certain period of time (E12): ↓ Bypass misfeeding ↓ “Clear paper” symbol ( ) displayed ↓ Copying operation disabled Solution: Remove paper from the bypass tray, and the bypass sensor will be turned OFF.
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B-1) Misfeed in copier ( ) • Paper leading edge jam detected by exit sensor Registration motor turned ON ↓ Exit sensor not turned ON within 0.975 sec. ON ↓ “Clear paper” symbol ( Exit sensor ) displayed (E01) ↓ Timer 0.975sec. 0 Copying stopped • Paper trailing edge jam detected by exit sensor Registration motor OFF Misfeed in copier (E01) Registration motor ↓ Exit sensor not turned OFF within 0.952 sec.
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• When a sheet of reversed paper is transported: Transport sensor 1 not detecting paper in a certain timing ↓ “Clear paper” symbol ( ) displayed (E51, 52, 53, 54) • When a sheet of paper is fed: Feed sensor not turned ON after feed clutch has been turned ON ↓ “Clear paper” symbol ( ) displayed (E13, 14, 15, 16, 18, 19: Error codes change depending on the cassette used.
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4. 4. Flowchart 4. 4. 1.
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A Polygonal motor rotating Scanning section initialization Is toner full detection sensor ON? YES NO NO Is toner empty? Drum motor ON (used toner full clear operation) for 6 sec. NO YES Is toner full detection sensor ON? YES Toner bag replacement Toner supply Is initialization finished? NO Have 20sec.
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4. 4. 2.
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B Paper jam "E02" NO Is fuser unit exit sensor ON? YES Main charger OFF Discharge lamp OFF Developer bias OFF Drum motor OFF Transfer belt motor OFF Fuser motor OFF Developer unit motorOFF Recycle toner transport motorOFF Used toner transport motor OFF Drum reversed Standby AR-651/810 GENERAL OPERATIONS 4 - 14
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5. CONTROL PANEL 5. 1. Control Panel and Display Panel The display unit consists of key switches and touch-panel switches to operate the copier and select various modes. LEDs and an LCD are used to display the state of the copier and show messages. When the operator’s attention is required, graphic symbols appear with messages explaining the condition of the copier in the LCD panel.
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5. 2. Items Shown on Display Panel 5. 2. 1. Display during normal copying Note No. Message 1 WAIT WARMING UP - The set number “1” and the reproScanner warming up - Displayed when the power is turned ON un- duction ratio “100%” are displayed til the copier becomes ready to start scan- when the power is turned ON. ning. 2 READY(WARMING UP) Ready for scanning 3 READY State of copier - The set number “1” is displayed.
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No. Message 12 READY (SADDLE STITCH TRAY FULL) State of copier Note Ready for scanning Printing is resumed by removing pa- The copier is ready for scanning and waiting per from the saddle stitcher unit. for the operator to select the copying conditions. The saddle stitcher is full of paper.
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C A Fig. 5.2-1 G I E J D H F E K B Fig. 5.
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5. 2. 2. Display in abnormal condition No. 1 Message Add paper Abnormal state and indication on display panel Solution Paper run out [Fig.5.2-1 A] - Add paper to the cassette. - The cassette with no paper flashes. - Select a different cassette. 2 Add toner Press [HELP] - Replace the toner cartridge and close Toner run out [Fig.5.2-2 B] the front door. - The toner cartridge is empty. - The message is displayed and the copier is stopped. 3 Set key copy counter Key copy counter not installed [Fig.
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No. Message Abnormal state and indication on display panel Solution 15 Select the same Displayed when the paper sizes for sized Inserter sheets inserter paper and original are different as the originals - Select the same size for the inserter sheets and originals. 16 Set Tab sheets in the Displayed when the paper directions for same direction as tab paper and original are different the originals - Set the tab sheets in the same direction as the originals.
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Operation - - Paper jammed inside the machine Service call indicated AR-651/810 CONTROL PANEL 5 - 7 : Operation enabled - : Operation disabled - Power OFF Manual operating - - - In energy saver mode Ready for interrupt copying - - Paper misfeed in bypass copying (optional) Key copy counter not inserted Toner empty Paper run out Scanning Printing - - - - - - - - - - - - - - - - - - key - - - - - - - key - feeding Cassette INTERRUPT ENERGYSAVER Bypass sele
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5. 4. Operation 5. 4. 1. Dot matrix LCD circuit (1) Structure (320 x 240) The DSP-LCD-320 is an STN blue mode transmissive type LCD with a 320 x 240-dot display capacity. It consists of a driver LSI, frame, printed circuit board, and lateral type CFL backlight.
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(3) LCD drive operation The following describes the drive operation to display the message “READY”. PWA-F-SYS-300 PWA-F-SYS-340 (a) The System CPU requests the PROM data to display “READY”. (a) GA System CPU (c) (c) LCD controller (d) PROM (b) The PROM outputs data to display the message to the System CPU. (b) R A M (c) The System CPU writes the data to be displayed on the LCD into the RAM. (d) The LCD controller/driver reads the LED display data from the RAM, and outputs the data to the LCD.
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5. 4. 2. LED display circuit (1) Method of LED display ex) Displaying “COPY” 5VL Current LDON0 "L" Q3 "L" 17 D7 G (COPY) LED4 R3 IC8(7932) The transistor is turned ON when the LDON 0 signal becomes “L” level. Also, when IC8-17pin (D7) changes to “L”, the current flows from 5VL via the transistor to LED4 (“COPY”) to turn ON LED4 (“COPY”). Conditions to turn ON the LED (a) The transistor (Q3) connected to the LED anode is ON. (b) The output from the cathode side of the LED is “L” level.
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5. 5. Disassembly and Replacement [A] Control panel unit (1) Open the front cover and take off the front side right inner cover, toner cartridge drive unit and toner recycle unit. (2) Remove 2 screws and take off the control panel bottom cover. Control panel bottom cover Clamp (3) Disconnect 3 connectors, remove 2 screws, release harnesses from 2 clamps and take off the control panel unit.
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(6) Remove 9 screws and take off the MKEY board. (7) Remove 8 screws and take off the SKEY board. (8) Remove 4 screws and take off the LCD panel.
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6. SCANNING SECTION 6. 1. Function In the scanning section of this copier, the surface of an original is irradiated with a direct light and the reflected light is led through mirrors and lens to the CCD where the optical-to-electrical conversion is performed, converting the optical image data into an electrical signal. This analog signal is changed to a digital signal, and then undertakes various corrective processes necessary for image formation.
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6. 2. Construction The construction and purpose of the scanning system are described in this section. (1) Original glass This is the glass on which originals to be copied are placed. The light from the exposure lamp is irradiated to the original through this glass. (2) Carriage-1 The carriage-1 consists of the exposure lamp, lamp inverter, reflector, mirror-1, etc. It is driven by the scanner motor and scans the original on the glass. a.
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(3) Carriage-2 The carriage-2 consists of mirror-2, mirror-3, etc. and directs the reflected light from the mirror-1 through mirrors-2 and -3 to the lens. This carriage-2 is driven by the scanner motor as the carriage-1, at half the scanning speed of carriage-1 (the scanning distance is also half of carriage-1). (4) Lens unit The light reflected from mirror-3 is led to the CCD placed at the focal point of the lens which is fixed in position.
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6. 3. Operation 6. 3. 1. Scanner motor Scanner motor Carriage wire Carriage-1 Pulleys for carriage-2 Ø20 Idler pulley Motor pulley Ø20 2GT-Z24 Carriage-2 Wire pulley Ø30.83/2GT-Z84 (a) Scanning original on original glass This motor drives the carriages-1 and -2 through the timing belt and carriage wire. The scanner motor first drives carriages-1 and -2 to their respective home positions. The home positions are detected when carriage-1 passes the home position sensor.
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9 M2 AR-651/810 SCANNING SECTION 6 - 5 ENABLE 15 Mol 14 RESET 13 M3 12 CLOCK 11 CWB 10 8 M1 CR oscillation Excitation status monitor Switching pulse ON/OFF detection Excitation mode setting Generation of reference clock Phase counter PWM control Generation of phase excitation signal Generation of pseudo sine wave SUB 7 6 Switching current fraction ratio Vref Vcc2 5 A 4 AB 3 B 2 BB 1 PG 6. 3. 2.
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PWA-F-SLG J8 SCNREF-0A 6 SCNEN-0 2 SCNRST Scanner CPU SCN-MOT 1 3 SCNDIR-0 Motor 4 SCNCLK-0 driver 5 5 4 SCNMD1-0 3 2 1 6 SCNMD2-0 IC4 IC9 J9 +36V +36V SCNMD3-0 1 2 3 4 Circuit diagram Input signals SCNCLK-0 CLK input Input The motor is rotated by setting the number of pulses. * The internal circuit of the motor driver works at the rising and falling edge of the pulse.
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6. 4. Control for Exposure Lamp 6. 4. 1. General description Control circuit of the exposure lamp consists of the following 3 blocks. (1) Lighting device for the Xenon lamp (Inverter) Turns the exposure lamp ON/OFF. (2) CCD sensor circuit This circuit works to the convert the reflected light amount from the original surface and the shading correction plate to the electrical signals. The reflected light amount from the shading correction plate is read to control the exposure amount.
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6. 4. 2. Exposure lamp External electrode type Xenon fluorescent lamp is used as an exposure lamp in this copier. (1) Structure The fluorescer is applied to the inside surface of the lamp pipe (except for a part which serves as an opening) which is filled with the Xe- PET film Aluminum tape electrode Glass valve non gas. A pair of the external electrodes Fluorescer covered by film with adhesive agent is attached around the pipe.
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6. 4. 3.
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6. 5. CCD Control 6. 5. 1. Opto-electronic conversion A CCD (charge-coupled device) is used to produce an electrical signal corresponding to the reflected light amount from the original. The CCD is a one-chip opto-electronic conversion device, comprised of several thousand light-receiving elements arranged in a line; each one of them is a few microns square. This model is equipped with a CCD which has 7,500 light-receiving elements.
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6. 6. Automatic Original Size Detection Circuit This circuit detects the size of original (standard sizes only) using the reflection type photosensors arranged on the base frame of the scanner unit. 6. 6. 1. Principle of original size detection The reflection type photosensors are placed on the base frame of the scanner unit as shown in the Fig. 6.61. Each sensor consists of an infrared light emitting diode (LED) on the light emitting side, and a phototransistor on the light receiving side.
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[A4 Series] A5 B5 A4 APS-5 APS-4 A5–R B5–R A4–R APS-3 APS-1 B4 APS-2 A3 [LT Series] ST LT APS-5 APS-4 ST–R APS-3 LT–R LG APS-2 LD Fig.6.
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(4) Original size is determined by the combination of the presence/absence of signals which are output at each detection point. The combination chart for size determination of A4 series and LT series are as followed.
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About reflection type photosensor The reflection type photosensor is comprised of an infrared light emitting diode and a phototransistor. It uses the pulse modulation to detect an original. Original 8µsec 130µsec LED Phototransistor The light emitting diode is driven by a pulse having a 130-µsec cycle and an 8-µsec ON time. When the phototransistor receives the same signal as this pulse, it is determined that there is an original.
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7. IMAGE PROCESSING 7. 1. General Description The following diagram shows the process from scanning of the original to data writing on the photoconductive drum surface of the digital copier. ASIC stands for “Application Specific IC”, meaning an IC designed for a particular use.
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7. 2. Image Processing Circuit 7. 2. 1. General description The image of an original placed on the original glass is scanned by the carriage. The CCD (Charge Coupled Device) reads the optical image signals and converts them into the electrical signal. The electrical signals then undergo the analog-to-digital conversion and are changed into digital signal.
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7. 2. 2. Configuration The following diagram shows the image processing section of this copier.
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7. 3. SLG Board (PWA-F-SLG-340) 7. 3. 1. Features (1) The image processing ASIC on the SLG board is controlled by the CPU on the SLG board. (2) The image processing ASIC on the SLG board realizes the following functions: • High-quality image processing • Image memory editing • Editing processing • Gamma correction • Gradation processing • External output system interface 7. 3. 2.
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(b) Filtering This function is enabled by a low-pass filter circuit and a high-pass filter circuit. • Low-pass filter circuit This circuit removes image noise and electrical noise, decreases moire, and realizes high reproducibility of original by applying an averaging operation on the image signal of the targeted pixel and those of the pixels positioning next to it. The density of the targeted pixel position is “x”.
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(2) Image memory editing This function performs editing such as enlargement/reduction, mirror imaging, etc. using the line memory. Pixel data for one line in the primary scanning direction are stored in the line memory and the memory is renewed at each line. (a) Enlargement/reduction The enlargment/reduction is accomplished by using the line memory control function in the process of the image processing operation.
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7. 4. PLG Board (PWA-F-PLG-340) 7. 4. 1. Features (1) The image processing ASIC on the PLG board is controlled by the CPU on the PLG board. (2) The image processing functions of the PLG board realizes the following functions: • Smoothing processing • External input system interface • Image area control • Laser related control 7. 4. 2.
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7. 5. Scanning Section Light reflected from original surface is directed to the CCD which performs the opto-electronic conversion, and the optical image data is converted into an electrical signal. This analog signal undergoes the A/D conversion processing and is changed into a digital signal. The signal then undertakes various corrective processes necessary for image formation.
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8. LASER & OPTICAL UNIT 8. 1. General Description The laser optical unit radiates the laser beam onto the photoconductive drum responding to the digital image signals, which have been sent from the scanner, printer controller, etc., to create a latent image. The Image signal is converted into the light emission signal of the laser diode on the laser driver board, and it is radiated on the drum through the optical elements such as cylinder lenses, polygonal mirror and fØ lens.
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Laser emission unit 1st laser diode 1st laser drive PC board Finite focus lens 2nd laser drive PC board fØ lens 2 2nd laser diode Finite focus lens Half mirror Galvanic mirror Cylinder lens Polygonal motor fØ lens 1 H-Sync detection PC board Front side H-Sync turnup mirror 2nd turnup mirror Front side 1st turnup mirror Slit glass (Laser light exit) Rear side [Laser optical unit overview] AR-651/810 LASER & OPTICAL UNIT 8 - 2
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8. 2. Structure (1) Laser emission Unit This unit consists of the laser diode, finite focus lens and aperture. a. Laser diode This laser diode features low droop, small laser variation and low threshold current. An aperture determines the shape of the laser beam at the laser emission position. The laser diode radiates the laser beam responding to the laser emission control (ON/OFF) signals from the laser drive board. The laser beam which passed through the finite focus lens are focused on the drum surface.
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(2) Polygonal motor unit (A) This unit consists of the polygonal motor, polygonal mirror and polygonal mirror cover. a. Polygonal motor Drum This motor rotates the polygonal mirror at high speed. The DC motor controls the rotation speed of the mirror polygon as follows: During standby :10,000.000 rpm (approx.) During copying :37,216.337 rpm (approx.) Laser light (B) b. Polygonal mirror Laser beams emitted from the laser diode are reflected by this mirror.
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(3) fØ lenses 1 and 2 These two lenses perform the following adjustment on the laser beams reflected by the polygonal mirror. Wider a. Uniform-velocity scanning Since the polygonal mirror is rotating at a uniform velocity, the laser beam reflected from the Narrower mirror scans over the drum surface at a uniform angular velocity; namely, the pitch between the dots on the drum is wider at both ends than at Drum the center of the scanning range.
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(5) Laser drive board This control board has the following functions: a. APC control function (adjusts disparity of the laser intensity caused by temperature) b. Laser ON/OFF function c. Function to generate the primary scanning synchronizing signals (6) Slit glass Slit glass is located where the laser beams are output from the laser optical unit, and it protects the unit from dust.
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8. 3. Laser Diode The laser used in this copier is a A1GaAs type semiconductive laser. It is generated in the single-horizontal mode, and its wavelength is approx.780nm. This semiconductive laser outputs 15mW with standard DC power supply. Laser intensity is controlled by using the output from the PIN diode for monitoring light output in the semiconductive laser. The relation between the current and optical output of the semiconductive laser is as shown at right.
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8. 4. Disassembly and Replacement [A] Laser fan motor (1) Remove the top right cover, feed side upper cover and feed side center cover. Remove 1 screw and loosen 10 screws and take off the plate cover. (2) Remove 2 screws and take off the optical unit fixing stay. (3) Disconnect 1 connector and remove 2 screws Laser fan motor to take off the laser fan motor.
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[B] Laser optical unit (1) Remove the original glass and lens cover. ( Chap.6) (2) Loosen 2 laser unit set screws. (3) Remove the laser fan motor. (4) Disconnect 3 connectors and pull out the laser unit. Laser unit [C] Laser control PC board (PLG board) (1) Remove the laser unit. (2) Disconnect 5 connectors and remove 4 screws to take off the PLG board. Notes: 1. Do not leave fingerprints or stain on the slit glass. 2.
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9. PAPER FEEDING SECTION 9. 1. General Description The paper feeding system is for transporting paper set on the cassette, bypass tray and tandem LCF to the transfer section. The clutch controls to convey the motor drive to each roller, and each sensor detects the transporting state of the paper. 9. 2. Functions 5 15 4 2 1 3 7 6 8 14 9 10 13 11 12 Paper feeding system sectional view (Front side) No. Name No.
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(1) Pickup roller These rollers draw paper off the stack from the bypass tray, cassette or tandem LCF and send it to the feed roller. (2) Feed roller This roller is placed against the separation roller. It transports paper from the pickup roller to the transport roller. (3) Separation roller This roller is placed against the feed roller.
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(10) Tray-up sensor This sensor detects the tray position when the paper lift plate of the cassette and tandem LCF is in the up position. (11) Bottom sensor This sensor detects when the paper lift plate is at the lower unit position for the cassette and tandem LCF.
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9. 3. Operation 9. 3. 1. Operation of bypass pickup roller Bypass pickup solenoid Spring Pickup arm Lever Bypass pickup roller Shaft Bypass feed roller When the bypass pickup solenoid is turned ON, the plunger is pulled and the lever is rotated and lowered. The pickup arm, which is linked with the lever, is also lowered with the lever by its own weight. When the bypass pickup solenoid is turned OFF, the pickup arm is brought up by the spring force.
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9. 3. 3. Paper separation This model is equipped with a separation roller which Feed roller works to prevent multiple paper feeding. The separation roller unit consists of the feed roller, separation roller, torque limitter, etc., as shown at the right. The feed roller is rotated by the feed clutch in the direction of the arrow ( ) at the same timing as the pick up roller rotation.
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9. 3. 4. General operation [A] From power ON to standby status (1) When the copier is turned ON, the tray-up motor is activated and the 1st cassette tray starts to rise. When the tray-up sensor is turned ON (H 촞 L), the tray-up motor is turned OFF and the tray is stopped. At this time, if the empty sensor is OFF (L), it is judged that there is no paper in the cassette. With the empty sensor being ON (H), there is paper in the cassette.
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[E] Tandem LCF (E-1) From power ON to standby status (1) When the copier is turned ON, the power is supplied to start the pre-running operation. The tandem LCF tray-up motor starts to rotate forward and raises the tray. The tandem LCF tray-up motor is turned OFF when the tray turns ON the tandem LCF tray-up sensor, and the tray is then stopped. At this time, it is judged whether there is paper on the feed side tray when the tandem LCF empty sensor is ON.
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(E-2) Standby status (1) Trays detect the paper as described above, and the copier goes into the standby status. (2) The tray goes down automatically when the tray unit is removed and is raised as soon as the tray unit is reinstalled it then checks if there is paper in the tray. (E-3) From the start to the end of copying (1) The drum motor of the copier is turned ON when the [START] key is pressed. The transport motor is also turned ON to drive the transfer belt unit.
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b) Call for service (1) When the tandem LCF tray-up sensor is not turned ON even through a specified time has passed since the tray started to be raised, it is assumed that the tray cannot be used (there is no paper) and the corresponding message is displayed on the control panel.
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9. 4. Drive Circuit for Tray-up Motor Cassette tray-up motor (MOT) : Driven by IC72 (tray-up motor 1) and IC36 (tray-up motor 2) (LGC: TA8428) Block diagram of TA8428 Thermal shutdown overcurrent protection circuit Control logic 1 2 3 4 5 6 7 IN1 IN2 M(+) GND M(–) N.C. VCC IN1 and IN2 are input terminals to receive the signals from the microcomputer. The control logic, based on the signals from the microcomputer, controls the rotation direction and ON/OFF of the motor.
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9. 5. Disassembly and Replacement [A] Feed unit (A-1) Pickup roller/Feed roller/Separation roller (1) Remove the feed side rear cover. (2) Open the feed side center cover and disconnect 1 connector. Connector (3) Remove 2 pins and lift the bypass feed unit with the feed side center cover to take off. (4) Open the feed side bottom cover and lift it to take off. (5) Pull out the cassette or tandem LCF completely. Note: With failing that, sensors may be damaged.
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(7) Remove 1 clip and take off the pickup roller. (8) Remove 3 screws and take off the guide. Clip (9) Remove 1 clip and take off the feed roller. Feed roller (10)Remove 1 clip and take off the separation roller.
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(A-2) Empty sensor/Tray-up sensor/Transport sensor Connector (1) Disconnect 1 connector and take off the empty/ tray-up sensors. Empty sensor Tray-up sensor (2) Disconnect 1 connector, remove 1 screw and take off the transport sensor. Note: Make sure to put on the spring properly after replacing the sensors.
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(A-3) Feed clutch/Transport clutch (1) Release the harness from the harness clamp. Then remove 1 screw and take off the clutch cover. Clutch cover (2) Disconnect 1 connector, remove 1 E-ring for each clutch and take off the feed and transport Transport clutch clutches. Harness: purple Notes: 1. When installing the clutches, pay attention to the color of harness and fit the stoppers on them completely. 2.
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(5) Remove 4 screws (2 in the front and 2 in the rear side) and take off the guide. E-ring Remove 2 E-rings (1 in the front and 1 in the rear side) and take off the transport roller. REAR E-ring FRONT (6) Disconnect 1 connector, remove 2 screw and take off the solenoid. [B] Transport unit (1) Disconnect 1 connector and remove 2 screws to take off the transport unit.
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(2) Remove 1 E-ring, disconnect 1 connector and release the intermediate transport clutch. Note: 1. When installing the clutch, fit the stopper on it completely. 2. Make sure that the E-rings are tightly fit not to be loosen and one end of E-ring does not ride too much on the flat part of shaft. [C] Bypass feed unit (1) Remove the bypass feed unit. (2) Remove 1 clip and 1 bushing and displace the bypass transport roller.
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Bypass feed clutch (6) Remove 1 clip, disconnect 1 connector, take off 1 harness band and release the bypass feed clutch. Clip Harness band (7) Remove 5 screws, disconnect 1 connector and Connector take off the stay. (8) Disconnect 1 connector and remove 2 screws to take off the solenoid. Notes: 1. When installing the solenoid, install it for the edge of the solenoid to get in phase with the edges of the plate. 2.
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(9) Remove 4 screws and take off the guide. (10)Remove 1 clip, displace the shaft and take off the separation roller. Separation roller Clip (11)Remove 2 screws for each bracket and release 2 fixing brackets. Then take off the bypass tray. Fixing bracket (12)Remove 3 screws, release 4 latches and take off the bypass tray upper cover.
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(13)Remove 1 screw and take off the plate spring. (14)Remove 1 screw (as shown with the white arrow) from the back side and release the bracket. Bracket Earth plate spring (15)Disconnect 1 connector, remove 1 screw and take off the paper size detection sensor board. Paper size detection sensor board Connector Note: When installing the bracket, install it so that the Pointer pointer of the bracket comes to the position where it has been before being removed.
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[D] Tray drive unit (1) Remove the rear cover and take off the power supply unit. (2) Remove 4 screws and take off the tray drive unit. (3) Turn over the tray drive unit. Then release 6 Latch latches and take off the cover. Note: Since the spring inside the tray drive unit is forcing the cover to extend, be careful when taking off the cover. Latch (4) Remove the tray-up motor. Note: Make sure the bosses of the gear fit into the hole of the cover when installing the unit.
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[F] Feed drive unit (1) Remove the power supply unit. (2) Remove 3 screws and take off the power cable connecting section. (3) Remove 6 screws and take off the feed drive unit.
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[G] Tandem LCF (G-1) Feed side front guide (1) Remove 2 screws fixing the feed side front guide. (2) Lift the paper guide a little and insert it in the groove of the paper size marking. Then tighten up the screw after confirming the screw hole position. Paper size marking A4 LT (G-2) Feed side rear guide (1) Remove 2 screws fixing the feed side rear guide. (2) Lift the paper guide a little and insert it in the groove of the paper size marking.
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(G-3) Standby side front guide (1) Remove 1 screw fixing the standby side front guide and move the guide toward the direction of the white arrow. (2) Lift the paper guide a little and insert it in the groove of the paper size marking. Then tighten up the screw after confirming the screw hole position. LT A4 (G-4) Standby side rear guide (1) Remove 1 screw fixing the standby side rear guide and move the guide toward the direction of the white arrow.
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(G-5) Standby side paper mis-stacking detection sensor (1) Remove 2 screws and release the sensor bracket. (2) Disconnect 1 connector. (3) Release the latches and take off the sensor. Latch (G-6) End fence home position sensor/Standby side empty sensor (1) Disconnect 1 connector and release the harness from the clamp. (2) Remove 1 screw fixing the standby side rear guide. Then move the guide toward the direction of the white arrow and take it off.
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(G-7) End fence stop position sensor (1) Disconnect 1 connector, remove 1 screw and release the bracket. (2) Release the latches and take off the sensor. Note: Remember that the position where the end fence stop position sensor is installed depends on a [A4 size] [LT size] End fence stop position sensor Feed side paper size. Bracket (G-8) End fence motor (1) Disconnect 1 connector. (2) Remove 3 screws, and take off the end fence motor.
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10. PROCESS SECTION 10. 1. Construction This chapter describes the image formation process related units, parts and control circuit, etc. Mainly included in this chapter are the followings. • Main charger • Charger wire cleaner • Discharge lamp • Ozone filter • High-voltage transformer • Surface potential sensor • Exhaust duct The drum/cleaner unit, developer unit and transfer belt unit are described in other chapters.
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10. 2. Functions (1) Drum The drum is a cylindrical aluminum base which has thinly applied to it an organic photosensitive material. The photosensitive material produces an electrical current when exposed to light. The amount of current produced is indirect proportion to the light intensity and exposure time. (2) Main charger The main charger is configured by stretching a thin wire between two insulation blocks provided at both ends of the U-shaped metal housing.
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10. 3. Charger Wire Cleaner Operational Circuit (1) Role of the charger wire cleaner circuit This circuit is for cleaning the main charger wire. It reciprocates the wire cleaner regularly to avoid a poor charging and irregularities of the drum.
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10. 4. High-voltage Transformer Output Control Circuit 10. 4. 1. General description The high-voltage transformer output control circuit is a circuit that generates the output control voltage (Vc) for the main charger (Main), transfer belt power supply roller (Transfer), drum cleaning brush (Brush) and developer bias (Developer). It changes the output current linearity by changing the Vc. 10. 4. 2.
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J347-2 HVTVR D/A converter J347-8 HVDVR J347-5 HVMVR Gate array IC18 IC56 Main CPU BC-RAM IC58 IC27 AR-651/810 PROCESS SECTION 10 - 5 Transfer Developer Main
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10. 5. Surface Potential Sensor 10. 5. 1. General description The surface potential sensor detects the surface potential of the photoconductive drum and controls it to keep constant. 10. 5. 2. Construction The surface potential is controlled by the following construction.
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(2) Conrol during warming-up When the warming-up begins, the control is carried out following (1) at the previous page and the warming-up ends within the control allowable level. (3) Control when finishing printing job When the printing job has finished, the control is carried out following (1) at the previous page and the printing operation ends within the control allowable level.
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10. 6. Disassembly and Replacement Main charger [A] Main charger (1) Open the front cover and take off the front side right inner cover, toner cartridge drive Chap.12.6) unit and toner recycle unit. ( (2) Remove 1 screw and pull out the main charger. (3) Push the button to release the tension of the Main charger grid main charger grid and take off the grid. (4) Release 1 latch and take off the front side Terminal cover terminal cover.
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(6) Pull up the terminal, release the spring, Terminal unhook the rear side hook and take off the charger wire. Charger wire (7) Remove 1 screw and take off the cleaning Spring Cleaning pad pad. Note: When installing the cleaning pad, install it so that the charger wire go through the pad side. Pad Wire [B] Wire cleaner drive unit Main charger (1) Remove the main charger and cleaner unit. (2) Disconnect 1 connector, remove 1 screw and take off the charger guide.
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(3) Disconnect 1 connector, remove 2 screws and Wire cleaner drive motor take off the wire cleaner drive motor with the bracket. (4) Remove 2 screws and take off the motor. (5) Disconnect 2 connectors, remove 1 screw and take off the wire cleaner stop position switch. Purple Black 45 Connector A Note: When installing the switch, fix it with pushing it toward the arrow 훽.
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[E] Surface potential sensor (1) Take off the developer unit, main charger, cleaner unit and control panel bottom cover. (2) Disconnect 1 connector, remove 1 screw and take off the bracket. Bracket (3) Disconnect 1 connector, remove 1 screw and take off the surface potential sensor. Connector Surface potential sensor [F] Temperature/humidity sensor (1) Take off the control panel unit ( Chap.5.5). (2) Disconnect 1 connector, remove 1 screw and take off the temperature humidity sensor.
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[G] Exhaust duct Clamp Connector (1) Take off the exit side upper cover and open the exit cover. (2) Disconnect 3 connectors and release the harnesses from 4 clamps. (3) Unhook the exhaust duct with sliding it toward the front side and pull it out. Connector (4) Disconnect 1 connector and pull out the duct Duct out fan out fan. (5) Remove 2 screws and take off the exit fan with the bracket. (6) Remove 2 screws and release the exit fan from the bracket.
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11. DRUM/CLEANER UNIT 11. 1. Construction This chapter describes about the drum and cleaner unit related units, parts, control circuit, etc. The cleaner unit consists of the drive section, cleaning section, recovered toner transport section, image quality sensor, drum separation finger, etc.
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11. 2. Functions (1) Drum cleaning blade It is pushed to the drum with a certain pressure by a weight and scrapes off the residual toner on the drum surface. The pressure is released and the blade is separated from the drum by turning the cam manually. (2) Drum recovery blade It catches the toner scraped by the drum cleaning blade. (3) Recovered toner transport auger It transports the scraped toner to the recycle unit.
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11. 4. Image Quality Control 11. 4. 1. General description This copier carries out the image quality control with the image quality sensor. The image quality control is for changing the image formation condition to minimize the changing of the image density and line width caused by the environment and life. The image quality sensor detects the density of the test pattern developed on the drum, and the image formation condition is changed depending on the result. 11. 4. 2.
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11. 4. 3. Outline of control Start controlling (e.g.
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11. 4. 4.
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11. 5. Disassembly and Replacement Cleaner unit [A] Cleaner unit Main charger (1) Open the front cover and take off the front side right inner cover, toner cartridge drive unit, toner recycle unit, developer unit and main charger. (2) Remove 2 screws and pull out the cleaner unit. [B] Drum thermistor/Drum Connector (1) Disconnect 1 connector and remove 1 screw. Drum thermistor Then take off the drum thermistor with the bracket.
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(5) Remove 3 screws and take off the front side flange. (6) Pull out the drum upward. [C] Cleaning blade Cleaner top cover (1) Pull out the drum. (2) Remove 4 screws and take off the cleaner top cover. (3) Turn over the cleaning blade with holding the bracket. (4) Remove 1 screw. (5) Pull out the cleaning blade with holding each foot of 2 screws.
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[D] Recovery blade Recovery blade (1) Remove the recovery blade. Notes: 1. The recovery blade is attached with a double-faced tape, so remove the tape completely before attaching a new blade. Recovery blade 2. Attach the recovery blade fitting its A bottom edge into the notch of the cleaner frame. Cleaner flame Drum surface [E] Cleaning brush (1) Pull out the rear side holding shaft and take off the cleaning brush.
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(2) Remove 1 E-ring and take off the cam. E-ring Cam (3) Move the shaft of the separation finger toward the rear side and pull it out. (4) Remove the screws and pull out the separation fingers from the shaft. Separation finger [G] Image quality sensor (1) Remove 2 screws and take off the sensor with the bracket. (2) Remove 2 screws and take off the image quality sensor.
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[H] Drum motor (1) Remove the rear cover and take off the SYS Drum wheel board and hard disk with the bracket. (2) Remove 3 screws and take off the drum wheel. (3) Disconnect 1 connector and remove 3 screws to take off the drum motor with the bracket. Drum motor (4) Remove 3 screws and take off the motor. Note: When installing the drum motor, fix it keeping the bracket in the direction of the white arrow.
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12. DEVELOPER UNIT 12. 1. Construction This chapter describes about the following units related to the development process, parts, control circuit, etc.
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12. 2. Functions (1) Toner cartridge drive unit The toner cartridge is filled with toner and supplies it to the developer unit with the driving of the new toner supply motor. (2) Toner recycle unit This copier takes a toner recycle method. The toner recovered from the drum surface with the cleaner is transported to the developer unit by the toner recycle unit and then reused. (3) Developer unit a. Developer material The developer material consists of the carrier and toner.
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g. Scattered toner recovery roller This is a roller for trapping and recovering the toner scattered from the developer sleeve not to get outside of the developer unit.
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12. 3.
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Developer unit drive Motor shaft G10 Idle gear G48 P25 Idle gear P25 Developer unit Paddle G25 Drive input gear G27 Idle gear G24 Rear paddle gear G31 Idle gear G20 Lower and upper developer sleeves G17 Front paddle gear G18 Idle gear G19 Transport sleeve G23 Copier rear side drive Rear side Mixer-1 G24 Mixer-2 G45 G45 G18 Idle gear G16 Idle G30 gear G16 Idle gear G20 AR-651/810 DEVELOPER UNIT 12 - 5 Scattered toner recovery roller G20 Front side
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12. 4. Motor Drive Circuit 12. 4. 1. New toner supply motor The new toner supply motor (brush motor) is a motor for supplying toner to the developer unit from the toner cartridge. It is driven by the motor driver IC38, and its circuit configuration is shown in the following.
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12. 4. 2. Developer motor FG pulse 5.1V Wave shaping DEVCK Reference requency V-phase Phase comparator Difference Current detection circuit Speed comparator Difference Control signal +24VA DEVON Rotation control U-phase Excited phase switching unit W-phase C A B Developer motor (M13) Roter position detector A, B, C: Hall element (1) The LGC transmits control signals for the developer motor rotation (DEVON: motor rotation command).
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(1) DEVCK signal (LGC DEV-MOT: input) This signal is a reference clock signal for the developer motor to rotate at a fixed speed. The frequency of the reference clock is 821.2Hz. When the cycle of the FG pulse deviation from the reference frequency is within +6.25%, this state is specified as lock range (normal rotation). Also, at this time, the LED “D4” light comes ON. (2) DEVON signal (LGC DEV-MOT: input) This signal is the motor ON/OFF control signal.
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12. 5. Auto-toner Sensor Circuit 12. 5. 1.
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12. 5. 2. Operation of auto-toner sensor (1) Functions of the auto-toner sensor a. Initializing function: When the copier is set up or when the developer material is replaced The automatic adjustment is made so that the output of the auto-toner sensor (input value of the main CPU) will be 2.45 to 2.55V for the toner density of new developer material. b. Toner density stabilizing function: During the printing operation Through the following phases, the toner density is kept constant.
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When the toner density is low: Toner ratio to the carrier in the developer material decreased 촞 Magnetic resistance decreased 촞 Detection output increased 촞 Auto-toner output VATS increased When the toner density is high: Toner ratio to the carrier in the developer material increased 촞 Magnetic resistance increased 촞 Detection output decreased 촞 Auto-toner output VATS decreased AR-651/810 DEVELOPER UNIT 12 - 11
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12. 6. Disassembly and Replacement [A] Toner cartridge drive unit (A-1) Toner cartridge drive unit (1) Open the front cover and take off the toner cartridge and front side inner cover. (2) Loosen 1 screw and take off the bracket. (3) Disconnect 1 connector. (4) Pull down the fixing pin and turn it 90 degrees. Fixing pin (5) Pull out the toner cartridge drive unit about 30 degrees and take it off toward the direction of the arrow.
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[B] Toner recycle unit (B-1) Toner recycle unit (1) Remove the toner cartridge drive unit. (2) Remove 2 screws and take off the toner recycle unit. Notes: 1. Be careful when treating this unit because the toner is liable to be spilled out from the connecting section among the toner recycle unit, cleaner unit and developer unit. 2. When installing the toner recycle unit, put the window of the toner recycle unit shutter section and protrusion of the developer unit together. 3.
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[D] Developer unit Developer unit (1) Remove the toner cartridge drive unit and toner recycle unit. (2) Turn the L-shaped shaft upward to release the lock. (3) Disconnect 1 connector and pull out the developer unit to the front side. L-shaped shaft [E] Developer material Top cover (1) Remove the developer unit. (2) Remove 2 screws and take off the top cover. (3) Tilt the developer unit and get out the developer material with turning the rear side Gear gear. (4) Put in a new material.
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Note: When installing the top cover, insert the latches completely and be careful not to catch up the urethane seal. Also, pay attention to the lap of the urethane sheets. [F] Doctor blade (1) Remove the developer material. Doctor blade (2) Remove 2 screws and take off the doctor blade. Note: When installing the doctor blade, put the both Protrusion edges of it against the protrusions at the front and rear side frames, and tighten up the screws to fix it.
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[H] Guide roller (1) Remove the developer unit. (H-1) Front side (2) Remove 2 screws and take off the bracket and 3 gears. Bracket (3) Remove 1 E-ring and take off the spring. (4) Remove 2 E-rings and take off 2 guide rollers. Guide roller Spring E-ring E-ring (H-2) Rear side Bias connector Bushing (5) Remove 1 E-ring and take off the gear. (6) Remove 1 E-ring and 1 spring and take off the bushing. (7) Remove 4 screws, take off the rear side frame and disconnect the bias connector.
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[I] Scattered toner recovery roller/Developer sleeves (magnetic roller) (1) Remove 3 screws and take off the front side plate. Front side plate (2) Remove the scattered toner recovery roller. Developer sleeve holder (3) Remove 2 screws of the front side developer sleeve holder. Scattered toner recovery roller (4) Remove the bearing and E-ring and take off Developer sleeve holder the gear and parallel pin. (5) Remove 2 screws of the rear side developer sleeve holder.
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(8) Remove 4 E-rings and take off 2 gears. Developer sleeve holder (9) Take off the developer sleeve holders at both the front and rear sides. Gear (10) Remove 2 seals, 4 shield bushings and the scraper and take off both the upper and lower Seal Shielded bushing Scraper side developer sleeves. (11) If necessary, replace the oil seals that are pressed in 2 rear side shield bushings.
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[K] Mixer Gear (1) Remove the auto toner sensor. (2) Remove 2 E-rings and take off 2 rear side gears. (3) If necessary, remove 2 bearings and replace 2 oil seals that is pressed in the frame. Note: When installing the bearing, install it after E-ring spreading the grease (Albania No.2) all round the mixer shaft. (4) Remove 2 E-rings and 2 screws and take off Mixer nozzle the front side mixer nozzle. (5) Pull out 2 mixers. (6) If necessary, replace the oil seal that is pressed in the mixer nozzle.
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(4) Remove the gear and 1 E-ring and take off the E-ring front side paddle bushing. (5) If necessary, replace the oil seal that is pressed in the paddle bushing. (6) Pull out the paddle. * Procedure for replacing an oil seal: Page 12-20 Paddle bushing <> In the developer unit, the oil seals are used at the following 9 places. • Rear side of the upper and lower developer sleeves (1pc. for each) • Front side transport sleeve (1pc.
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[M] Developer unit motor Connector (1) Remove the rear cover. (2) Remove the SYS board and hard disk with the bracket. (3) Disconnect 1 connector, remove 3 screws, and take off the developer unit motor with the bracket. (4) Remove 2 screws and release the motor from the bracket. Developer unit motor [N] Developer unit switch (1) Remove the developer unit, main charger, cleaner unit and control panel bottom cover. (2) Disconnect 1 connector, remove 1 screw and take off the bracket.
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13. TRANSFER/TRANSPORT UNIT 13. 1. General Description Transfer/Transport unit consists of the transfer belt unit, fuser unit and transport path through which a duplex printing is carried out. This chapter excludes the description of the fuser unit. 4 3 2 1 No. 5 6 Name 1 Follower roller 2 Power supply roller 3 Transfer belt 4 Transfer belt drive roller 5 Cleaning blush 6 Recovery auger 7 Cleaning blade 7 Fig. 1 Belt transport unit sectional view 13. 2.
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13. 3. Functions (1) Transfer belt unit The transfer belt is coated with a high-precision flat rubber belt and has electrical resistance. The transfer belt unit is divided into a belt support/power supply section and a cleaning mechanism. The belt support/power supply section supports the belt and rotates to supply power, and the cleaning mechanism scrapes of toner from the belt surface.
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(8) Belt transport unit lock/unlock mechanism The belt transport unit is locked inside the copier. It is structured in such a way that it is locked when a paper jam is cleared, and can be drawn out towards you. The belt transport unit has a function for separating the transfer belt from the drum and a function for preventing erroneous operation of the handle when it is drawn out. • When the handle is rotated clockwise when viewed from the front, the belt transport unit can be drawn out horizontally.
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13. 4. Disassembly and Replacement [A] Transfer belt unit (1) Open the front cover, turn the handle clockwise and pull out the transfer/transport unit. (2) Remove 1 screw and take off the handle. (3) Remove 2 screws and take off the cover. (4) Disconnect 2 connectors, remove 1 clip and take Clip Connector off the front side bearing. Then remove 4 screws and take off the transfer belt unit. Note: When installing the transfer belt unit, install it as the lever comes under the cam.
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[B] Transfer belt (1) Remove the transfer belt unit. (2) Turn the transfer belt keeping/feeding section 90 degrees and pull it out upward. (3) Remove 2 screws. Note: When tightening up the screws, tighten them so that the link plate is securely fixed by pushing it toward the direction of the white arrows. (4) Turn the drive roller as the picture shows. (5) Pull out the transfer belt. Notes: 1. When installing the transfer belt, install it at the center not to be moved aside. 2.
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[C] Brush 2 (1) Remove the transfer belt keeping/feeding section. (2) Remove 1 screw and take off the plate spring. 1 (3) Move the transport guide to the rear side and pull it out upward. c (4) Remove 1 clip and take off 3 gears. b Notes: 1. The gears a/c has a latch, and remove the gears in the order a, b, c. 2. When installing each gear, make sure the a latch fits into the groove portion of the shaft. 2 (5) Remove 1 clip and take off the bushing.
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[E] Damp heater (1) Remove the transfer belt unit. (2) Remove 2 screws, disconnect 1 connector and take off the damp heater. Dump heater Note: When installing the dump heater, be careful not to catch it in the harness. Connector [F] Transfer/Transport unit (1) Open the front cover, turn the lever clockwise and pull out the transfer/transport unit. (2) Remove the fuser unit and transfer belt.
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(5) 쩸 Lift the transfer/transport belt unit and take off the catch-up section. 쩹 Slack off the right slide rail a little. 쩺 Push the rail to the inside of the unit. 1 3 2 (6) Change the A or B section to the right hand and hold the C section with the left hand. Then lift the transfer/transport unit and take it off. Notes: 1. Since the guide is sometimes transformed when being pressured, be careful not to hold the D section when lifting the transfer/ transport unit. 2.
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[G] Transport detection sensor (1) Remove the transfer belt and fuser unit. (2) Disconnect 1 connector, remove 1 screw and take off each sensor. [H] Transport clutch (H-1) Transport clutch 1, 2 E-ring (1) Disconnect 1 connector, remove 1 E-ring and take off each transport clutch. Notes: 1. When installing the clutches, pay attention to the color of harness. 2. Make sure that the E-rings are tightly fit not to be loosen and one end of E-ring does not ride too much on the flat part of shaft.
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[I] Transfer belt drive motor unit Connector (1) Remove the rear cover and take off the flywheel. (2) Disconnect 1 connector, remove 1 spring and 2 screws and take off the drive motor unit. Note: When installing the motor, rotate it counterclockwise to fix. Spring [J] Transfer belt contact/release cam drive unit (1) Remove the rear cover and take off the flywheel. (2) Disconnect 1 connector, remove 2 screws and take off the cam drive unit. (3) Disconnect the connector and take off 2 sensors.
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14. FUSER UNIT 14. 1. General Description The toner is fused on the paper separated from the photoconductive drum by applying heat and pressure to it. The paper is then discharged through the paper exit section. The fuser unit consists of the IH coil, fuser roller, pressure roller, separation fingers, cleaning web, cleaning rollers, thermistors, thermostat, exit rollers, exit sensor, etc.
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14. 3. Functions (1) IH coil (IH: Induction heating) The IH coil is inside the fuser roller and applies the induction heat to the fuser roller. This IH coil is divided into two parts, the center IH coil heating the center of the fuser roller and the side IH coil heating both ends of the fuser roller. Those parts become ON/OFF separately to always keep the fuser roller at a certain temperature without wasting excessive electric power.
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This sensor is for detecting that the trailing edge of the paper has reached the fuser unit exit sensor and also for detecting of paper jams at the fuser unit exit section. (9) Fuser roller center thermistor/Fuser roller side thermistor (rear) This thermistor detects the temperature of the fuser roller to maintain it in a certain range, which is higher than the lower limit causing the poor fusing and lower than the upper limit causing the high temperature offset.
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AR-651/810 FUSER UNIT 14 - 4 Temperature control circuit 5V SW CPU LGC IH ON/OFF signal Error signal Electric power setting Power supply for photocoupler AC line DC line IH Photocoupler AC input N Fuse Control circuit including CPU L Fuser roller IH power source/ drive circuit Coil output Coil Side thermistor (rear) [Block diagram of fuser unit and IH control circuit] 5V SW Drum thermistor Center thermistor Thermostat Side thermistor (front) Noise filter Breaker Power code 14.
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14. 4. 2. Heating principle of IH coil The magnetic field is generated by applying a high frequency current to the IH coil inside the fuser roller, which then produces the eddy current in it. When the eddy current flows, the Joule heat is generated by the resistance element of the fuser roller, which is then heated. In the IH coil method, the thermal efficiency is higher than the lamp method because the fuser roller is directly heated.
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14. 4. 3. IH control circuit interface The IH control circuit uses a photocoupler as an insulator against the secondary circuit. The interface signals are as followed.
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14. 4. 4. IH control circuit abnormalities The IH output is stopped when an abnormality occurs in the IH control circuit. (1) When the power voltage of the copier is too high or too low IH output is stopped to protect the IGBT when the input voltage, which is higher or lower than specified range, is applied to the copier. This is an error [C47]. (2) When the AC is not applied to the IH control circuit The error that the AC is not applied to the IH control circuit properly is [C47].
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14. 4. 5. Temperature detecting section To keep the fuser roller at a certain temperature, the center thermistor and side thermistor (rear) detect the temperature of the fuser roller and control ON/OFF of the IH coil. Outputs from the thermistors are used to detect abnormalities of the fuser roller temperature. (1) Relation between the thermistor output voltage and surface temperature of the fuser roller: Approx. 4.0V when the temperature is 200°C Approx. 3.8V when the temperature is 183°C, and approx. 3.
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(5) Error detection during warming up (2) 쩸 If the output voltage of either the center thermistor or side thermistor (rear) does not go over approx. 1.9V(100°C) even in a certain period of time after it has exceeded 40°C or 쩹 if it does not go over approx. 3.2V(150°C) even in a certain period of time after it has exceeded 100°C, the “Call for service” [C44] is displayed (6) Error detection during warming up (3) If the output voltage of the thermistor does not go over approx. 4.
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14. 4. 6. Detection of open-circuited thermistors A thermistor is a device which resistance decreases when it detects a high temperature. If the fuser roller thermistor is open-circuited, the control circuit finds that the fuser roller temperature is extremely low and keeps turning ON the IH coil. As a result, the fuser roller temperature rises, possibly activating the thermostat, which is a safety protection device. To prevent this, CPU works to detect if the thermistor is open-circuited or not.
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14. 5. Fuser Motor Drive 14. 5. 1. Outline of operation FG pulse +5.1V Reference Wave shaping Phase comparator V Current detecting circuit frequency Speed comparator (HTRCK) Control signal +36A Difference Difference HTRML HTRMT Rotation control Excited phase switching unit U W A B C Rotor position detection Fuser motor M/DC-HTR-340N U, V, W : Phase A, B, C : Hall element (2) The excited phase switching unit excites each phase on the fuser motor.
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14. 5. 2. Control signals (1) HTRCK signal (LGC → MOT:Input) This signal is a reference clock signal for the fuser motor to rotate at a fixed speed. The frequency of the reference clock is 1247.6Hz. (2) HTRML signal (LGC → MOT:Input) This signal switches low-speed fuser motor rotation ON/OFF. When the signal is “L”, the fuser motor rotates at a low speed. (3) HTRMT signal (LGC → MOT:Input) This signal is the fuser motor ON/OFF control signal. When the signal changes to “L”, the fuser motor is turned ON.
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14. 6. Disassembly and Replacement [A] IH control board (1) Open the front cover, turn the handle clockwise and take off the transfer/transport unit. (2) Remove 2 screws and open the cover forward slowly. (3) Remove 4 screws and release the IH coil fuser harness. C S IGBT Tighten 4 screws of the IH coil fuser harness FLOW C completely (tightening torque: 1.2~2.0Nm). Since the IH control board is a high-voltage section, S 3.
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[B] Fuser unit Cover 2 C (1) Remove 2 screws and open the cover forward slowly. S C S G (2) Remove 4 screws and release the IH coil fuser harness. Disconnect 2 connectors. (3) Remove 1 screw and open the cover 2 forward. Connector (4) Remove 1 screw move the fuser unit forward and lift it off upward. Notes: 1. Make sure that the harness (A) at the right B figure does not touch the bearing and shaft A of the transfer/transport unit when installing the fuser unit. 2.
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(4) Remove 2 E-rings and take off the web pushing roller. E-ring Cautions: 1. Take up the cleaning web a little (3~5 rotations with Pin hand) after replacing the cleaning web and web pushing roller. 2. When installing the cleaning web unit to the fuser unit, make sure that the web is not slacked off. 3. Turn the fuser unit jam access knob 10~15 times to adapt the cleaning web to the fuser roller. At this time make sure that there is no defect caused by an installing inadequacy. 4.
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[D] IH coil (1) Remove the cleaning web unit. (2) Remove 2 screws and take off the fuser cover (front). (3) Remove 2 screws and take off the bracket. (4) Pull out the IH coil. Note: Make sure that the “C” and “S” harnesses of the power supply harness comes to the left side when installing the IH coil.
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[E] Upper separation finger unit (1) Remove 2 screws and take off the crank plate and upper separation finger unit. Crank plate Upper separation finger unit (2) Remove each spring and take off each separation finger. Spring Upper separation finger [F] Cleaning roller (metal)/Lower separation finger (1) Remove 2 screws and open the guide. (2) Remove the cleaning roller (metal). Cleaning roller (metal) Spring (3) Remove each spring and take off each lower separation finger.
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(4) Remove 2 E-rings and take off the exit roller. Exit roller E-ring [G] Cleaning roller (felt) (1) Remove 2 screws and open the entrance lower guide unit. Entrance lower guide unit (2) Remove the cleaning roller (felt). Cleaning roller (felt) [H] Thermistor/Thermostat (1) Loosen 2 pressure screws completely.
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(2) Remove 2 screws and take off the stay. (3) Disconnect each connector, remove each screw and take off the thermistor and thermostat. Notes: 1. When installing the thermistor and thermostat, be careful not to deform them and plate to which they are installed. 2. Adjust the gap between the thermostat (2 points) and fuser roller to the range between 2~2.5mm. 2.0~2.5mm [I] Fuser roller (1) Loosen 2 pressure screws completely. (2) Remove 2 screws and take off the fuser unit cover (rear).
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(3) Remove 2 screws, release 2 harness clamp and Harness clamp take off the bracket with releasing the catching section. (4) Remove 2 screws and disconnect 1 connector. C-ring (rear) (5) Remove 1 C-ring (rear). Connector (6) Remove 1 E-ring and take off the gear. (7) Remove 2 screws and take off the bearing (rear). Bearing (rear) Gear (8) Remove 1 C-ring (front).
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(9) Take off the fuser roller covering it with paper and such not to make scars on it. [J] Pressure roller (1) Remove the fuser roller and take off pressure roller. [K] Web detection sensor (1) Remove the fuser unit cover (front). (2) Remove 1 screw and take off the web detection sensor with the bracket.
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15. EXIT/REVERSING UNIT 15. 1. General Description This copier conducts a paper reverse operation when printing more than 2 sheet of paper or carrying out a duplex printing. Its reversing device once transports the paper from the fuser unit to the reverse path where the paper is switched back and reversed, and then transports it to the exit roller or transfer section. 2 1 No.
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(a) 3 sheets × 1 copy Single-sided printing operation (A4/LT) [3] [1] [2] Step 1 Step 6 [1] [2] [3] Step 2 [2] Step 7 [3] [3] [1] Step 8 Step 3 [2] [3] [1] Step 4 [3] [2] Step 5 AR-651/810 EXIT/REVERSING UNIT 15 - 2
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(b) 5 sheets × 1 copy Duplex printing operation (A4/LT) [2] [1] [4] [3] Step 1 Step 6 [2] [2] [5] [1] [4] Step 2 [3] Step 7 [3] [3] [5] [2] [4] [1] Step 8 Step 3 [3] [1] [3] [4] [2] [5] Step 9 Step 4 [4] [1] [5] [4] [3] [2] Step 10 Step 5 AR-651/810 EXIT/REVERSING UNIT 15 - 3
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(c) 3 sheets × 1 copy Single-sided printing operation (A3/LD/B4/LG/A4-R/LT-R) [3] [1] Step 1 Step 6 [2] [3] [2] [2] [1] Step 2 Step 7 [2] Step 8 Step 3 [3] [1] [2] [3] [1] Step 9 Step 4 [3] [2] Step 5 AR-651/810 EXIT/REVERSING UNIT 15 - 4
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(d) 4 sheets × 1 copy Duplex printing operation (A3/LD/B4/LG/A4-R/LT-R) [2] [1] [4] [3] Step 1 Step 6 [3] [2] [1] Step 2 Step 7 [4] [3] [1] [4] Step 8 Step 3 [2] [1] [4] [3] [2] Step 9 Step 4 [4] [2] Step 10 Step 5 [3] AR-651/810 EXIT/REVERSING UNIT 15 - 5
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15. 3. Disassembly and Replacement [A] Exit/Reverse unit (1) Remove 6 screws and take off the exit side cover. (2) Remove 1 screw and take off the fixing bracket. (3) Disconnect 1 connector and lift the exit/reverse unit to take it off. Connector [B] Reverse section fan (1) Remove the exit side cover. (2) Disconnect 1 connector, remove 2 screws and take off the fans.
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[C] Reverse sensor (1) Disconnect 1 connector, remove 2 screws (1 for the lower sensor) and take off the sensors. Reverse sensor 1 Reverse sensor 2 [D] Gate solenoid (1) Disconnect 1 connector, remove 2 screws and take off the solenoid. Note: When installing the solenoid, position it so that it is flush with the edge of the mounting plate. While the solenoid is normally mounted in the A position, can be also be mounted in the B position. B A [E] Reverse motor (1) Remove the exit/reverse unit.
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[F] O-ring E-ring When installing the receiving tray, add the O-rings (service parts) to the exit roller in order to improve the paper stacking condition. (1) Remove 6 screws and take off the exit side cover. (2) Remove 2 E-rings and move the 2 bearings toward the inside. (3) Move the exit roller to the near side and install 2 O-rings to the grooves of the exit roller. Note: O-ring: Refer to the parts list for the parts number and so on.
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16. RADF (DOCUMENT FEEDER) 16. 1. General Description The Reversing Automatic Document Feeder (RADF) is a device that automatically feeds originals one by one to the ADF original glass and discharges them to the receiving tray after scanning is finished. RADF consists of the following sections. • Original feeding section This section, consisting of the pickup belt, feed roller, separation roller, registration roller, etc., feeds originals one by one to the ADF original glass.
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16. 2.
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16. 3. Drive System (1) Feed motor rotating forward (seen in front) One-way pulley lock One-way pulley idling Feed motor Rear Registration roller Feed motor rotates clockwise to feed originals. Front (2) Feed motor rotating in reverse (seen in front) One-way pulley idling One-way pulley lock Rear Feed motor rotates counterclockwise to feed originals.
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(3) Read motor rotating in reverse (seen in front) Large original Large original exit motor exit roller Rear Large original exit motor switches to the backside of an original by rotating clockwise and registers Read motor that side. Intermediate transport roller Read motor rotates counterclockwise to Front transport, scan and Read roller discharge originals.
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(5) Tray lift motor rotating forward (seen in front) Tray lift motor Tray lift motor rotates clockwise to lower the tray. Lifting tray (6) Tray lift motor rotating in reverse (seen in front) Tray lift motor Tray lift motor rotates counterclockwise to lift the tray.
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16. 4.
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16. 5. Operations 16. 5. 1. A4 single-sided feeding (Operational condition: A4 original/Reproduction ratio: 100%) (1) Original setting The empty sensor turns ON when the original has been set on the original feeding tray. (2) Lifting of the lifting tray The tray lift motor rotates to lift the tray after receiving the original feeding signal from the copier. With a specified delay after the upper limit sensor has detected a top side of the original, the tray lift motor stops rotating.
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(4) Start of feeding The feed motor starts to rotate in reverse. After the feed motor has finished accelerating, the read motor starts to rotate forward. With 1st original, both the feed and read motors start to slow down when the leading edge of the original has come to a specified distance before the read sensor. From 2nd original, the feed motor starts to slow down when the leading edge of the original has come to a specified distance before the 1st roller.
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The SCN-STR turns OFF when the trailing edge of the original has passed the scanning section, and before the trailing edge of the original passes the 3rd roller, 2nd original reaches the scanning waiting section and stops being transported. (6) Start of 2nd original scanning Scanning begins after receiving the original transport signal from the copier. At the same time,the original stop signal is reset.
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The SCN-SCR turns OFF when the leading edge of the original has reached the scanning section. When the trailing edge of the original has proceeded a specified distance after passing the 3rd roller, the large original exit motor starts to accelerate. (7) After the original trailing edge has passed the 3rd roller When the leading edge of the original has come to a specified distance before the small original exit roller, the small original exit motor starts to rotate forward.
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When the original has proceeded a specified distance after the small original exit sensor had detected the trailing edge of the original, the small original exit motor stops rotating. Then the operation ends after 2nd original has been discharged.
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16. 5. 2. A4 two-sided feeding (Operational condition: A4 original/Reproduction ratio: 100%) (1) Original setting Same operation as 16.5.1.(1) (2) Lifting of the lifting tray Same operation as 16.5.1.(2) (3) Start of separation Same operation as 16.5.1.(3) (4) Start of feeding Same operation as 16.5.1.(4) (5) Start of top side scanning Scanning starts after receiving the original transport signal from the copier. At the same time, the original stop signal is reset.
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The large original exit solenoid turns OFF when the large original exit motor stops rotating. (6) Start of 1st original back side registering The large original exit motor starts to rotate forward. After the large original exit sensor has detected the leading edge of the original then the original has proceeded a specified distance and been registered, the large original exit motor stops rotating.
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When the leading edge of the original has been transported to the intermediate transport section and come to a specified distance before the intermediate transport roller, the large original exit motor starts to rotate in reverse and the small original exit motor also starts to rotate in reverse and the small original exit solenoid turns ON. Feeding of the next original starts when the read motor has counted a specified time since the start of the scanning operation.
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The SCN-STR turns OFF when the trailing edge of the original has passed the scanning section. At the same time, both the read and the large original exit motors start to accelerate and the disengagement solenoid turns OFF. When the trailing edge of the original has passed the 4th roller then proceeded a specified distance, the large original exit motor starts to slow down.
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(12) Start of 2nd original back side scanning Scanning begins after receiving the original transport signal from the copier. At the same time, the original transport signal turns OFF. When the read motor starts to rotate forward, the large original exit motor also starts to rotate forward and the disengagement solenoid turns ON. The SCN-STR turns ON when the leading edge of the original has reached the scanning section. The large original exit motor stops when the disengagement solenoid has turned ON.
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The small original exit motor starts to rotate forward. Then it starts to slow down with a specified time delay after the small original reverse sensor has detected the leading edge of the original. The small original exit motor stops rotating when the trailing edge of the original has been detected by the small original exit sensor then proceeded a specified distance. The small original exit solenoid turns OFF and the operation ends when the original has been discharged.
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16. 5. 3. A4 single-sided feeding (Operational condition: A3 original/Reproduction ratio: 100%) (1) Original setting Same operation as 16.5.1.(1) (2) Lifting of the lifting tray Same operation as 16.5.1.(2) (3) Start of separating Same operation as 16.5.1.(3) (4) Start of feeding The feed motor starts to rotate in reverse. When the feed motor has completed acceleration, the read motor starts to rotate forward.
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(5) Start of 1st original scanning Scanning begins after receiving the original transport signal from the copier. At the same time the original stop signal is reset. When the read motor starts to rotate forward, the feed motor also starts to rotate in reverse and the large original exit solenoid turns ON. The SCN-STR turns ON when the leading edge of the original has reached the scanning section.
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When the trailing edge of the original has passed the 4th roller then proceeded a specified distance, the large original exit motor starts to slow down. After the large original exit sensor has detected the trailing edge of the original, the read motor stops rotating soon and the large original exit motor stops rotating when the original has proceeded a specified distance. Then the original is discharged. Both the read and feed motors stop when 2nd original has reached the scanning waiting section.
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When the trailing edge of the original has passed the 4th roller then proceeded a specified distance, the large original exit motor starts to slow down and the read motor stops rotating. The large original exit motor stops rotating when the trailing edge of the original has been detected by the large original exit sensor then proceeded a specified distance. The large original exit solenoid turns OFF and the operation ends when the original has been discharged.
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16. 5. 4. A3 two-sided feeding (Operational condition: A3 original/Reproduction ratio: 100%) (1) Original setting Same operation as 16.5.1.(1) (2) Lifting of the lifting tray Same operation as 16.5.1.(2) (3) Start of separation Same operation as 16.5.1.(3) (4) Start of feeding Same operation as 16.5.1.(4) (5) Start of 1st original top side scanning Scanning begins after receiving the original transport signal from the copier. At the same time the original stop signal is reset.
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When the trailing edge of the original has passed the scanning section, the SCN-STR turns OFF and both the read and large original exit motors start to accelerate. The large original exit motor slows down when the trailing edge of the original has passed the 4th roller and proceeded a specified distance.
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When the leading edge of the original has been transported to the large original exit side and come the 3rd roller, the large original exit motor starts to rotate in reverse . The SCN-STR turns OFF when the trailing edge of the original has passed the scanning section. At the same time, both the read and large original exit motors start to accelerate and the disengagement solenoid turns OFF.
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(9) Reversing and discharging of 1st original Both the large original exit and read motors start to rotate foward. When the leading edge of the original has reached the read sensor then been transported a specified distance by the read motor, the disengagement solenoid turns ON. The large original exit motor stops when the disengagement solenoid has turned ON.
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(10) Start of 2nd original top side scanning Scanning begins after receiving the original transport signal from the copier. At the same time the original stop signal is reset. When the read motor starts to rotate forward, the feed motor also starts to rotate in reverse. (The large original exit solenoid has been ON from 1st original.) The SCN-STR turns ON when the leading edge of the original has reached the scanning section.
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(11) Start of 2nd original back side registering Same operation as 16.5.2.(6) (12) Start of 2nd original back side feeding Same operation as 16.5.2.(7) (13) Start of 2nd original back side scanning Same operation as 16.5.2.(8) (14) Idle reversing and discharging of 2nd original Both the large original exit and read motors start to rotate foward.
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16. 5. 5. Single-sided feeding at mixed-original mode (Operational condition: A4-R and FOLIO originals/Reproduction rario: 100%) (1) Original setting Same operation as 16.5.1.(1) (2) Lift of the lifting tray Same operation as 16.5.1.(2) (3) Start of separation Same operation as 16.5.1.(3) (4) Start of feeding The feed motor starts to rotate in reverse. After the feed motor has finished accelerating, the read motor starts to rotate forward.
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The large original exit motor starts to slow down when the trailing edge of the original has proceeded a specified distance after passing the 4th roller. After the large original exit sensor has detected the trailing edge of the original, the read motor stops rotating soon and the large original exit motor stops rotating when the original has proceeded a specified distance. The original is nipped by the large original exit roller. (5) Start of back side registering Same operation as 16.5.2.
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(7) Back side registering to set the top side Same operation as 16.5.2.(6) (8) Start of top side feeding Same operation as 16.5.2.(7) (9) Start of scanning Scanning begins after receiving the original transport signal from the copier, and at the same time, the original stop signal is reset. The read motor starts to rotate foward and so does the large original exit motor. Then the disengagement solenoid turns ON. (The large original exit solenoid has been ON since the original was idle reversed.
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The large original exit motor starts to slow down when the trailing edge of the original has proceeded a specified distance after passing the 4th roller. At the same time, the read motor stops rotating unless there is a next original. The large original exit motor stops rotating when the trailing edge of the original has proceeded a specified distance after being detected by the large original exit sensor. Then the original is discharged.
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16. 6. Jams 16. 6. 1. Jams at feeding section (1) Original jammed not reaching the original length sensor • Jam detection This jam is detected during the time after the feed motor begins to rotate forward to start separation until an original reaches the original length sensor. • Jam timer setting The setting value for the jam timer is three times as much time as it takes to transport an original from the pickup position (where the empty sensor detects the original) to the original length sensor.
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(3) Original jammed not reaching the read sensor • Jam detection This jam is detected during the time after an original comes to the 1st roller until it reaches the read sensor. • Jam pulse setting The setting value for the jam pulse is the equivalent number of pulses it takes for an original to proceed the distance from the 1st roller to the read sensor plus 60mm.
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(2) Original jammed at the large original exit sensor (while discharging) • Jam detection This jam is detected during the time after the leading edge of an original passes the position 20mm further from the 4th roller until it passes through the large original exit sensor.
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(3) Original jammed not reaching the small original reverse sensor (from the small original reverse side to the small original exit side) • Jam detection This jam is detected during the time after discharging starts at the small original reverse section until an original reaches the small original reverse sensor. • Jam timer setting The setting value for the jam timer is three times as much time as mentioned above.
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(3) Original jammed not reaching the small original exit sensor (from the small original reverse side) • Jam detection This jam is detected during the time after an original reaches the small original reverse sensor until it reaches the small original exit sensor. • Jam timer setting The setting value for the jam timer is the time mentioned above plus necessary time for an original to proceed 60mm.
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16. 7. Errors Errors can be divided into the sensor adjustment error, EEPROM error and tray lift motor error. (1) Sensor adjustment error There are 4 kinds of sensor adjustment errors: 1) Original length sensor adjustment error 2) Read sensor adjustment error 3) Large original exit sensor adjustment error 4) Small original reverse sensor adjustment error The D/A output voltage is adjusted so that the A/D input voltage for each sensor is kept within the range between 3.16V~3.
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16. 8. Original Size Detection The original position base code is transmitted to the copier during the time after the feed signal is sent until 1st original passes through the original width sensor. The original size is detected whenever feeding an original and transmitted to the copier as a code before scanning starts. 16. 8. 1. Original size detection method (1) Original position base code The tray guide width is measured and stored when the feed signal is received.
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16. 8. 2. Original size detection chart A4 series Trayguide width Notover detected 160mm? receiving ORG-IN (mm) NO ~114 ~165 ~196 ~234 Trayguide width decided receiving ORG-IN (mm) 79 148 Original length sensor at scanning standby position OFF ON 182 OFF ON 210 OFF ON Size 2 (width 268.4mm or over) Size 1 Mixed (Width originals 196.
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LT series Trayguide width Not over detected 160mm? receiving ORG-IN (mm) NO ~110 ~178 ~237 Trayguide width decided receiving ORG-IN (mm) 79 140 Original length sensor at scanning standby position OFF ON 216 OFF ON Size 2 (Width 268.4mm or over) OFF ON Size 1 Mixed (Width originals 196.
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16. 9.
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(2) Rewriting of flash ROM A Normal ROM installed on jig board? NO YES ROM abnormality displayed on LED Flash ROM deleted Flash ROM succeeded to delete? NO YES Failure of deleting flash ROM displayed on LED Flash ROM rewritten Flash ROM rewriting succeeded? NO YES Success of rewriting displayed on LED Failure of rewriting displayed on LED Flash ROM rewriting completed AR-651/810 RADF (DOCUMENT FEEDER) 16 - 42
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(3) Start of communication line → Operation monitoring 3 B Cover closed? 1 NO Operation started YES All sensors OFF? NO Operation completed? YES NO YES Initialization Cover opened? YES Initialization detected jam? YES 4 3 Finished due to jam? NO NO Cover open? YES YES NO NO Original setting signal received? 4 YES 1 Cover opened? NO 3 AR-651/810 RADF (DOCUMENT FEEDER) 16 - 43 NO
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(4) Initialization Initialization started Feed motor reverse rotation Read motor forward rotation Large original exit motor reverse rotation Small original exit motor forward rotation For paper no removal detection, specified time passed? Original found on the transporting path? YES NO Paper no removal detection Initialization completed AR-651/810 RADF (DOCUMENT FEEDER) 16 - 44 Jam
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(5) Control for separation Control for Separation started 2 1 Lifting tray up Registration sensor ON? NO From original length sensor ON, specified pulse passed? YES YES Lifting tray up completed? NO NO A Feed motor stopped Registration sensor ON? YES NO YES A Feed motor forward rotation Registration sensor OFF? NO Specified pulse passed? YES Original length sensor ON? YES NO Feed motor forward rotation Feed motor stopped YES 2 Lifting tray down Pre-feeding control from registrati
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(6) Control for pre-feeding from registration roller Control for pre-feeding from registration roller started Feed acceptable? Control for pre-feeding from the 1st roller started NO YES Read sensor ON? NO YES Feed motor reverse rotation Specified pulse passed? NO YES Feed motor acceleration completed? NO Size detected YES First copy? NO YES NO YES Read motor stopped Read motor forward rotation Reached the 1st roller? Size detection succeeded? NO Control for leading edge scanning st
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(7) Trailing edge control for pre-feeding Trailing edge control for pre-feeding started Original trailing edge passed original length sensor? 1 NO Small original? YES NO YES A Feed motor stopped Original length data acquired NO Small original? Next original detection started YES Feed motor stopped Midpoint between registration roller and the 1st roller passed? YES Trailing edge control for pre-feeding completed Next original detection started Registration sensor OFF? NO YES 1 AR-651/81
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(8) Control for next original detection Control for next original detection started Lifting tray up YES NO Specified time passed? YES NO Next original? YES NO Lifting tray up completed? Lifting tray down YES Next original separation started Lifting tray down completed? NO YES Control for next original detection completed AR-651/810 RADF (DOCUMENT FEEDER) 16 - 48
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(9) Leading edge control during scanning Leading edge control during scanning started Original trailing edge on separation side? 1 NO Leading edge transported to large original exit side? NO YES YES A Original trailing edge passed original length sensor? YES Large original exit motor forward rotation Large original exit solenoid ON Disengagement solenoid ON Original trailing edge on large original exit side? NO Feed motor reverse rotation NO YES Previous original trailing edge passed the 3
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C Leading edge transported to large original exit side? NO YES Large original exit motor used in RADF transporting operation? NO Leading edge control during transporting started YES Disengagement solenoid ON Large original exit motor stopped? NO YES Large original exit motor started The 4th roller reached? NO YES Large original exit sensor ON? NO YES Large original exit roller reached? NO YES Leading edge control during scanning completed AR-651/810 RADF (DOCUMENT FEEDER) 16 - 50
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(10) Trailing edge control during scanning Trailing edge control during scanning started Original trailing edge on separation side? 1 NO Transported to large original exit side? YES Original trailing edge passed the 1st roller? YES NO Read motor accelerated until max. speed YES Read sensor OFF? NO Large original exit motor accelerated until max.
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2 The 3rd roller passed? NO YES Transported to large original exit side? NO YES The 4th roller passed? YES The 4th roller pass margin passed? NO The 3rd roller pass margin passed? YES Trailing edge control during transporting started YES Trailing edge control for large original discharging started Trailing edge control during scanning completed AR-651/810 RADF (DOCUMENT FEEDER) 16 - 52 NO
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(11) Trailing edge control for large original discharge Trailing edge control for large original discharging started 1 Large original exit motor decelerated Back side aligned? YES NO Large original sensor OFF? A NO Large original exit motor forward rotation NO Read motor forward rotation Large original exit motor forward rotation YES Original reversed? YES After transporting the specified pulse, large original exit motor stopped Large original exit roller passed? Large original exit sensor
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(12) Leading edge control during transporting Leading edge control during transporting started Specified pulse of original leading edge passed from the 3rd roller? 1 NO Intermediate transport roller reached? NO YES YES Large original exit motor reverse rotation Back side? NO YES Back side? NO Small original exit motor reversal sensor ON? YES YES Small original exit solenoid ON Leading edge control during transporting completed Small original exit motor reverse rotation Intermediate trans
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(13) Trailing edge control during transporting Trailing edge control during transporting started Intermediate transport sensor OFF? 1 NO Small original reversal sensor OFF? YES NO YES A Specified pulse of original trailing edge passed from intermediate transport roller? After counting specified pulse, small original exit motor stopped NO YES Next original leading edge reached? Small original exit motor forward rotation NO YES Large original exit motor stopped Small original reversal sensor
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(14) Leading edge/trailing edge control for small original discharging Leading edge control for small original discharging started Trailing edge control for small original discharging started Specified pulse of original leading edge NO passed from intermediate transport roller? Back side? YES NO YES A Small original exit motor forward rotation Small original reversal sensor OFF? NO YES Small original exit sensor ON? YES NO Specified pulse passed? NO YES Leading edge control for small origin
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OFF ON CW H CW L Stop Read sensor Read motor AR-651/810 RADF (DOCUMENT FEEDER) 16 - 57 OFF ON OFF ON Large original exit sensor Intermediate transport sensor OFF ON OFF ON OFF ON Small original reverse sensor Small original exit sensor Small original exit solenoid CW H CW L Stop CCW L CCW H OFF ON Disengagement solenoid Small original exit motor OFF ON Large original exit solenoid Large original exit motor CW H CW L Stop CCW L CCW H OFF ON OFF ON Registration sensor Reading start s
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OFF ON CW H CW L Stop Read sensor Read motor AR-651/810 RADF (DOCUMENT FEEDER) 16 - 58 OFF ON OFF ON Large original exit sensor Intermediate transport sensor OFF ON OFF ON OFF ON Small original reverse sensor Small original exit sensor Small original exit solenoid CW H CW L Stop CCW L CCW H OFF ON Disengagement solenoid Small original exit motor OFF ON Large original exit solenoid Large original exit motor CW H CW L Stop CCW L CCW H OFF ON OFF ON Registration sensor Reading start s
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AR-651/810 RADF (DOCUMENT FEEDER) 16 - 59 OFF ON CW H CW L Stop Read sensor Read motor OFF ON OFF ON Large original exit sensor Intermediate transport sensor OFF ON OFF ON OFF ON Small original reverse sensor Small original exit sensor Small original exit solenoid CW H CW L Stop CCW L CCW H OFF ON Disengagement solenoid Small original exit motor OFF ON Large original exit solenoid Large original exit motor 7867 8120 7894 8095 8519 8572 8773 8519 8572 8646 8773 8586 8469 8657 8751 8
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OFF ON CW H CW L Stop Read sensor Read motor AR-651/810 RADF (DOCUMENT FEEDER) 16 - 60 OFF ON OFF ON Large original exit sensor Intermediate transport sensor OFF ON OFF ON OFF ON Small original reverse sensor Small original exit sensor Small original exit solenoid Small original exit motor OFF ON Disengagement solenoid CW H CW L Stop CCW L CCW H OFF ON Large original exit solenoid Large original exit motor CW H CW L Stop CCW L CCW H OFF ON OFF ON Registration sensor Reading start s
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OFF ON CW H CW L Stop Read sensor Read motor AR-651/810 RADF (DOCUMENT FEEDER) 16 - 61 OFF ON OFF ON Large original exit sensor Intermediate transport sensor OFF ON OFF ON OFF ON Small original reverse sensor Small original exit sensor Small original exit solenoid Small original exit motor OFF ON Disengagement solenoid CW H CW L Stop CCW L CCW H OFF ON Large original exit solenoid Large original exit motor CW H CW L Stop CCW L CCW H OFF ON OFF ON Registration sensor Reading start s
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16. 11. Circuits (1) Input circuits for read sensor, large original exit sensor, small original reverse sensor and original length sensor Since the read sensor, large original exit sensor, small original reverse sensor and original length sensor have almost the same circuitry, only the input circuit for the read sensor is described as followed.
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(2) Irruptive current control circuit This circuit controls the irruptive current flowing into the current regeneration condensers mounted on the drive circuits for the motors to a certain value. The circuit consists of a posister (PTH1) which controls the current and FET (Q12) which supplies the current in normal conditions.
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(3) Drive circuit for read motor This circuit controls the rotation/stoppage and the direction of rotation, excitation mode and motor current of the read motor. A drive clock signal (RMOT_CLK) and rotation direction signal (CWB) are input to control the speed and direction of the motor rotation. M1 and M2 are the exciting mode setting signals. The PWM signal of RMOT_CU is separated and smoothed at R80, R76 and C91, and it is input into IC10-7pin(Vref) to set the motor current value.
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(5) Drive circuit for large original exit motor, small original exit motor and tray lift motor Since the large original exit motor, small original exit motor and tray lift motor have almost the same circuitries, the drive circuits for the small original exit motor and tray lift motor are not described. The following is the drive circuit for the large original exit motor. This circuit controls the rotation/stoppage, the direction of the rotation of the large original exit motor and the motor circuit.
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(7) Reset circuit This circuit generates a CPU reset signal when the power is turned ON and the power voltage is detected to have become lower. The level of IC5-6pin (OUT) is normally "H" after the power is turned ON. However, when the power is turned OFF or the voltage of the +5V power supply is decreased to 4.25V or lower for some reason, the level of IC5-6pin becomes "L" and the CPU is reset. (8) EEPROM circuit This circuit is an EEPROM to store ADF data and its peripheral circuit.
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(9) Conversion circuit for D-A This is a circuit of the D-A converter to converse the digital signal from CPU to the analog signal. Controls of CPU are done by the serial communications of each DI, CLK, LD signal. The analog output signals from Ao1 to Ao4 are used to adjust the light intensity of the light emitting diode (LED) of the reflective sensor. Also, Ao5 and Ao6 output 5V or 0V and are used as the output ports.
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16. 12. Input/Output Signals (1) TXD/ACK/REQ signals This is an input circuit to communicate with the copier. “1” substitutes 5V and “0” substitutes 0V. The same logic is used in both the connector and CPU input port.
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(2) RXD/SCN-STR/DF_ACK/DF_REQ signals This is an input circuit to communicate with the copier. “1” substitutes 5V and “0” substitetes 0V. The same logic is used in both the connector and CPU output port.
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(3) Input circuits for each sensor RADF open/close sensor APS operation sensor Original width sensor 1 Original width sensor 2 Original width sensor 3 Registration sensor Empty sensor Upper limit sensor Lower limit sensor Intermediate transport sensor Small original exit sensor Cover open/close sensor Tray sensor Tray width sensor AR-651/810 RADF (DOCUMENT FEEDER) 16 - 70
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Small original reverse sensor Read sensor Large original exit sensor Original length sensor These are the input circuits from each photosensor.
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Signal logic Sensor Connector level 5V(“1”) Connector level 0V(“0”) DFOPNS (RADF open/close sensor) RADF open RADF close APS (APS operation sensor) APS OFF APS ON COPS (Cover open/close sensor) Cover close Cover open EMPS (Empty sensor) No original Original existing ULMTS (Upper limit sensor) Upper limit — SIZES 1 (Original width sensor 1) Original existing No original SIZES 2 (Original width sensor 2) Original existing No original SIZES 3 (Original width sensor 3) Original existing
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16. 13. Disassembly and Replacement [A] RADF unit (1) Remove the rear cover and disconnect 1 connector. Connector (2) Remove 2 screws, open and move the RADF unit toward the rear side and take it off upward. [B] Covers ADF front cover (B-1) ADF front cover (1) Open the jam access cover, remove 3 screws and take off the ADF front cover. (B-2) ADF rear cover ADF rear cover (1) Open the jam access cover, remove 4 screws and take off the ADF rear cover.
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(B-3) ADF left cover ADF left cover (1) Remove 2 screws and take off the ADF left cover while moving it downward. [C] ADF board (4) Lock support (1) Remove 4 screws and take off the rear cover. (2) Disconnect all 15 connectors from the board. (3) Remove 1 screw and 2 lock supports and take (3) off the ADF board. (4) Remove 2 screws, release the harness from the clamp and take off the bracket.
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(4) Remove 3 clips and pull out the feed roller shaft, pickup roller belt and pickup Pickup belt Clip intermediate shaft. Then take off the pickup belt and feed roller. Feed roller (D-2) Separation roller Upper guide unit (1) Open the jam access cover. (2) Remove the pickup unit. (3) Remove 2 screws and take off the upper guide unit. (4) Remove 2 screws and take off the separation unit.
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(6) Remove the clip and pull out the pulley, parallel Pulley, Parallel pin pin and separation roller from the shaft. Clip Separation roller [E] Motors (3) Connector (E-1) Feed motor (4) (1) Open the jam access cover. (2) Remove the ADF rear cover. (3) Remove 2 screws of the harness cover and (6) (4) slack off the harness. (3) (4) Disconnect 1 connector, take off the tension spring, remove 2 screws and take off the feed motor with the tension bracket.
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(E-2) Tray lift motor Tray lift motor (1) Remove the ADF rear cover. (2) Remove the ADF board with the bracket. (3) Remove 2 screws and take off the tray lift motor with the bracket. (4) Pull out 2 pulleys from the shaft and release the tray lift motor from the bracket. (E-3) Read motor Read motor (1) Remove the ADF rear cover. (2) Remove the tension spring. (3) Disconnect 1 connector. (4) Remove 2 screws and take off the read motor with the bracket.
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(E-4) Small original exit motor Tension spring Connector (1) Remove the ADF rear cover. (2) Remove the ADF board with the bracket. (4) (3) Remove the tension spring. (6) (4) Disconnect 1 connector, remove 2 screws and take off the small original exit motor with the tension bracket. (5) Remove 2 screws and release the small (4) original exit motor from the tension bracket. Small original exit motor (6) Install the small original exit motor to the tension bracket.
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[F] Solenoids Small original exit solenoid (F-1) Small original exit solenoid (1) Remove the ADF rear cover. (2) Remove the ADF board with the bracket. (3) Remove the large original exit motor. (4) Remove 1 screw and take off the small original exit solenoid with the bracket. (5) Remove 2 screws and release the small original exit solenoid from the bracket. (F-2) Large original exit solenoid (1) Remove the ADF front cover while keeping the jam access cover open.
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[G] Sensors/Switches Cover open/close sensor (G-1) Lifting tray upper limit sensor/Empty sensor/ Cover open/close sensor (1) Open the jam access cover, remove 2 screws Empty sensor and take off the upper guide cover. (2) Disconnect the connectors and release the latches and take off the lifting tray upper limit sensor, empty sensor and cover open/close Lifting tray upper limit sensor sensor. (G-2) Lifting tray lower limit sensor Upper guide stay (1) Remove the upper guide unit.
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(G-3) Original length sensor Original length sensor (1) Remove the lower guide. (2) Remove 1 screw, disconnect 1 connector and take off the original length sensor with the bracket. (3) Remove 1 screw and release the original length sensor from the bracket. (G-4) Cover open/close switch (1) Remove the ADF rear cover. (2) Remove 1 screw and take off the cover open/ close switch. Cover open/close switch (G-5) Tray sensor Back cover (1) Open the tray, remove 3 screws and take off the back cover.
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(G-6) Tray width sensor (1) Open the tray, remove 3 screws and take off the back cover. (2) Disconnect 1 connector, remove 1 screw and take off the tray width sensor. Note: Put together both marks at the rack and pinion as shown by the right figure when installing the tray width sensor. (G-7) APS operation sensor (1) Remove the ADF rear cover. (2) Disconnect 1 connector. (3) Remove 1 screw and take off the APS operation sensor with the bracket.
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(5) Disconnect 1 connector, release the latches Intermediate transport sensor and take off the intermediate transport sensor. (G-9) RADF open/close switch (1) Remove the ADF rear cover. Blue Orange Brown (2) Disconnect 3 connectors. (3) Remove 1 screw and take off the RADF open/ close switch with the bracket. (4) Remove 1 screw and release the RADF open/ close switch from the bracket.
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(5) Remove 1 screw, disconnect 1 connector and Large original exit sensor take off the large original exit sensor with the bracket. (6) Remove 1 screw and release the large original exit sensor from the bracket. (G-11) Read sensor (1) Remove the ADF left cover. (2) Remove 1 screw, disconnect 1 connector and take off the read sensor with the bracket. (3) Remove 1 screw and release the read sensor from the bracket.
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[H] Platen guide Platen guide (1) Remove 2 screws fixing the platen guide. (2) Move the platen guide toward the direction of the white arrow until the right side edge of (2) the guide can be seen. (3) Remove the platen guide toward the direction of the white arrow.
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[I] Mylar and mirror seal (I-1) Mirror seal for original length sensor Ref. 0 ~ 0.5 mm Upper guide Ref. 0 ~ 0.
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(I-2) Mylar for read sensor Attach the mylar aligning the edge of it with the 0 ~ 0.5 mm corner end of the guide. Positioning the mylar Ref. other than from the corner end of the guide is not allowed. Platen outside guide Attach the mylar passing through the guide window to prevent twisting and too strong contact on the edge of the guide window.
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(I-3) Mirror seal for large original exit sensor Ref. Ref. 0 ~ 0.5 mm Large original exit guide Attach the mirror seal aligning the doublesided tape edge with the guide window edge. Attach the mirror seal Double-sided tape passing through the must not be out of the guide window to guide window edge. prevent twisting and too strong contact on the edge of the guide window.
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(I-4) Mirror seal for small original reversal sensor Ref. Attach the mirror seal 0 ~ 0.5 mm with fitting the edge of it to the rib. Do not interfere the rib. Ref. 0 ~ 0.
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(I-5) Mirror seal for read sensor Reference hole: Attach the mirror seal with locating its edge to the reference hole position. Mirror seal Platen guide Mirror seal Reference hole Ref. 1 ~ 1.
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(I-6) Mirror seal for large original exit sensor Positioning other than from the edge of the guide is not allowed. 0 ~ 1.0 mm Ref. Reverse guide Mirror seal Attach the mirror seal between ribs. Do not interfere the rib.
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17. POWER SUPPLY UNIT 17. 1. Construction The power supply unit is comprised of the AC filter and insulation type DC output circuits. (1) AC filter AC filter eliminates noise from the outside and prevents the noise generated by the copier from leaking to the outside. (2) DC output circuits The DC outputs are roughly divided into the following two lines: 쩸Main switch system : Power supply used during image forming processes, consisting of the outputs of four voltages (+3.3V, +5.
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17. 3. Output Channel There are 4 output channels which do not work with the door switch. (1) 3.3V 3.3VA : J407 5pin Output to PLG board 3.3VB : J408 5pin Output to SLG board 3.3VC : J405 1pin, 2pin Output to SYS board (2) 5.1V 5.1VB : J405 5pin, 6pin Output to SYS board and printer board (via SYS board) 5.1VC : J405 7pin Output to HDD 5.1VD : J406 1pin, 2pin Output to LGC board 5.1VE : J408 7pin, 8pin Output to SLG board 5.1VF : J407 1pin Output to PLG board 5.
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(4) 24V 24VF : J408 1pin, 2pin Output to RADF 24VG : J406 4pin Output to LGC board There are 3 output channels which work with the door switch. (1) 5.1V 5.
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<> Not working with the door switch J405 for SYS board J406 for LGC board J407 for PLG board J408 for SLG board J409 for Finisher (1pin, 2pin) Working with the door switch J402 for LGC board J403 for PLG board J404 for SLG board J409 for Finisher (3pin~6pin) AR-651/810 POWER SUPPLY UNIT 17 - 4
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17. 4. Fuse When the power supply secondary fuse is blown out, confirm that there is no abnormality with each part using the following table.
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Voltage Board/Unit 24VC LGC Part Registration motor Fuse type F5: 4A (Semi time-lag) LCF unit IH fan motor Cassette tray-up motor 1/2 LCF tray-up motor 36VA LGC Fuser unit motor F6: 4A (Semi time-lag) Feed motor 36VB LGC Drum motor Transfer belt motor 24VD PLG (OPT) 24VE SLG (Scanner) Polygonal motor F7: 4A (Semi time-lag) Laser unit fan motor SLG fan motor SLG fan motor driver circuit (SLG board) Lamp inverter 36VC SLG (Scanner) Scanner motor F8: 4A (Semi time-lag) Scanner motor dri
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17. 5. Configuration of Power Supply Unit IH Frequency reactor Breaker Main switch Live F1 Noise filter Neutral Noise filter Reg. Door switch F3 24VA(LGC) F4 F5 24VB(LGC) F6 36VA(LGC) 24VC(LGC) 36VB(LGC) F7 24VD(PLG) 24VE(SLG) F8 F9 Switching power supply 5.1VA(PLG) 36VC(SLG) 24VH(FIN) 3.3VC(SYS) 5.1VB(SYS) 12VA(SYS) Frequency reactor 5.1VC(SYS) 5.1VD(LGC) 12VD(LGC) F2 Noise filter 24VG(LGC) F10 Reg. 24VF(RADF) 3.3VB(SLG) 5.1VE(SLG) 12VC(SLG) 5.1VF(PLG) 5.1VG(PLG) 3.
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17. 6. Power Supply Sequence ON AC input +3.3V(MAIN) OFF Within 700ms Within10ms 3.2V or more 3.2V or more 0~200ms 4.95V or more 0~200ms +5.1V(MAIN) 20ms 10ms 20ms or or or more more more 4.95V or more 10ms~120ms 0~200ms 50ms or more PWR-DN 0~200ms 5ms or more 5ms or more 11.4V or more 0ms or more 0ms or more 21.6V or more 11.4V or more +12V(MAIN) 21.6V or more +24V(MAIN) PWR-DN Within 200ms 4.95V or more 4.95V or more 21.6V or more 21.6V or more 34.2V or more 34.
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18.
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(2) PWA-F-LGC-340 AR-651/810 PRINTED WIRING BOARDS 18 - 2
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(3) PWA-F-SLG-340 AR-651/810 PRINTED WIRING BOARDS 18 - 3
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(4) PWA-F-PLG-340 AR-651/810 PRINTED WIRING BOARDS 18 - 4
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(5) PWA-F-CCD2-340 AR-651/810 PRINTED WIRING BOARDS 18 - 5
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(6) PWA-F-LDR-340 (7) PWA-F-SNS-340 (8) PWA-F-MOT-340 AR-651/810 PRINTED WIRING BOARDS 18 - 6
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(9) PWA-F-MOT2-340 (10) PBA-CONTROL (ADF CONTROL PC BOARD) AR-651/810 PRINTED WIRING BOARDS 18 - 7
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19. UNPACKING AND INSTALLATION WARNING 5) UNLOAD 6) REMOVE 7) INSTALL The unpacking and set-up procedure shall be done by a qualified service technician.
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8-2) REMOVE 12) REMOVE (Japan only) 2 3 1 9) 13) REMOVE REPLACE 10) OPEN 14) INSTALL 15) REMOVE 11) REMOVE 1 2 2 3 1 1 AR-651/810 UNPACKING AND INSTALLATION 19 - 2 1
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20) REMOVE 16) ROTATE 1 2 21) REMOVE 17) DISCONNECT 1 3 2 18) REMOVE 22) REMOVE 1 2 2 19) REMOVE 23) REMOVE 1 2 2 1 1 AR-651/810 UNPACKING AND INSTALLATION 19 - 3 2 1
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24) REMOVE 28) APPLY 29) LOCK 25) REMOVE 30) APPLY 26) REMOVE 31) INSTALL 27) REMOVE 1 2 AR-651/810 UNPACKING AND INSTALLATION 19 - 4
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32) UNLOCK 36) INSTALL 33) ROTATE 37) INSTALL 1 2 34) APPLY 38) INSTALL 2 1 1 35) ROTATE 39) INSTALL 1 2 1 AR-651/810 UNPACKING AND INSTALLATION 19 - 5 2
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44) INSTALL 40) REMOVE 41) FILL 45) INSTALL 1 2 2 42) INSTALL 46) INSTALL 2 1 43) INSTALL 47) ROTATE 3 1 2 2 1 AR-651/810 UNPACKING AND INSTALLATION 19 - 6
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52) INSTALL 48) INSTALL • When options are installed, be sure to fasten the screw securely after the installation.
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(4) After a short time, the value in Zone “B” will automatically stop changing and, at the same time, the message will also change as shown below. 56) PLUG IN AR-S810 (Japan only) (5) In this status, check that the value in Zone “B” is in the range of 245 to 255 (auto-toner sensor output range of 2.45V to 2.55V). (6) If the value in Zone “B” is in not in the range of 245 to 255, use the [ Down] / [ Up] keys to adjust the value. 57) INSTALL (7) Press the [SET] key.
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64) INSTALL 61) INSTALL 1 2 62) TURN ON 65) INSTALL 66) PRESS 63) ADJUSTMENT Setting the time (1) Press the PROGRAM key to enter the program menu. Then, press the DATE/TIME key. • If the key for the desired function is not shown, press the Next key to switch the screen. (2) Key in the year (last two digits only), month, date, day of the week, time (24-hour format) and minute, in this order from the left column. • Press the → key to move to the next entry column. [Ex.
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