SERVICE MANUAL REVISION 0 AUG. 1998 COPYRIGHT © 1998 CANON INC. FY8-13FB-000 CANON NP7161/NP7160 REV.0 AUG.
IMPORTANT THIS DOCUMENTATION IS PUBLISHED BY CANON INC., JAPAN, TO SERVE AS A SOURCE OF REFERENCE FOR WORK IN THE FIELD. SPECIFICATIONS AND OTHER INFORMATION CONTAINED HEREIN MAY VARY SLIGHTLY FROM ACTUAL MACHINE VALUES OR THOSE FOUND IN ADVERTISING AND OTHER PRINTED MATTER. ANY QUESTIONS REGARDING INFORMATION CONTAINED HEREIN SHOULD BE DIRECTED TO THE COPIER SERVICE DEPARTMENT OF THE SALES COMPANY.
INTRODUCTION This Service Manual contains basic facts and figures on the NP7161/NP7160 needed to service the machine in the field. This copier is designed to enable full automatic copying work, and comes with the following systems accessories: 1. ADF-G1* 2. Staper Sorter-L1* 3. MS-C1* 4. Cassette Feeding Module-C1 * NP7161 only.
The following rules apply throughout this Service Manual: 1. Each chapter contains sections explaining the purpose of specific functions and the relationship between electrical and mechanical systems with reference to the timing of operation. In the diagrams, represents the path of mechanical drive—where a signal name accompanies the symbol , the arrow indicates the direction of the electric signal.
System Configuration The copier is designed to accommodate the following accessories: *NP7161 only. ADF-G1* Feeds a stack of original pages to the copyboard page by page. Control Card IV N MS-C1* Stapler Sorter-L1* Sorts and groups up to In addition to the functions 10 sets of pages of a 10-bin sorter, staples automatically. sorted pages automatically. Controls volumes of copying work. Cassette Feeding Module-C1 Provides an additional cassette. COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.
iv COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CONTENTS CHAPTER 1 GENERAL DESCRIPTION I. FEATURES .............................................. 1-1 II. SPECIFICATIONS ................................... 1-2 A. Copier ................................................. 1-2 1. Type ............................................. 1-2 2. Mechanisms ................................. 1-2 3. Performance ................................. 1-3 4. Others ........................................... 1-5 III. NAMES OF PARTS .................................. 1-8 A.
CHAPTER 3 EXPOSURE SYSTEM I. OUTLINE OF OPERATION ..................... 3-1 A. Changing the Reproduction Ratio ...... 3-1 II. LENS DRIVE SYSTEM ............................ 3-3 A. Driving the Lens ................................. 3-3 1. Outline .......................................... 3-3 2. Motor Control Circuit .................... 3-4 3. Moving the Lens ........................... 3-5 III. SCANNER DRIVE SYSTEM .................... 3-6 A. Outline ................................................ 3-6 B.
1. Removing the Drum Unit ........... 4-28 2. Cleaning the Photosensitive Drum ........................................... 4-29 3. Removing the Cleaner Thermistor .................................. 4-29 D. Primary Charging Assembly ............ 4-30 1. Removing the Primary Charging Assembly .................... 4-30 E. Transfer Charging Assembly ........... 4-31 1. Removing the Transfer Charging Assembly .................... 4-31 F. Charging Wire .................................. 4-32 1. Outline .........
CHAPTER 6 FIXING SYSTEM I. OUTLINE OF OPERATION ..................... 6-1 A. Outline ................................................ 6-1 B. Controlling the Fixing Temperature ... 6-2 C. Error Detection Circuit ........................ 6-5 1. Outline .......................................... 6-5 2. Surface Temperature of the Fixing Upper Roller ...................... 6-6 3. Activation of the Fixing Heater (H1) ........................ 6-6 II. DISASSEMBLY/ASSEMBLY ................... 6-7 A.
CHAPTER 8 INSTALLATION I. SELECTING THE SITE ............................ 8-1 II. UNPACKING AND INSTALLATION ........ 8-2 A. Unpacking .......................................... 8-2 B. Removing the Metal Fixings ............... 8-3 C. Mounting the Drum Unit ..................... 8-4 D. Cleaning the Parts and Making Checks .. 8-6 E. Checking the Images/Operations and User Mode .......................................... 8-8 F. Supplying Toner ............................... 8-10 III. RELOCATING THE MACHINE ..
B. Image Fault Samples ..................... 10-28 C. Troubleshooting Image Faults ....... 10-29 1. The copy is too light. (halftone area only) .................. 10-29 2. The copy is too light. (including solid black area) ...... 10-30 3. The copy is too light. (entirely, considerably) ............. 10-30 4. The copy has uneven density. (front side dark) ........................ 10-31 5. The copy has uneven density. (front side light) ........................ 10-31 6. The copy is foggy. (overall) ......
1. 2. 3. 4. DC Controller PCB ................... 10-77 Power Supply PCB .................. 10-80 Lamp Regulator PCB ............... 10-80 High-Voltage Power Supply PCB .......................................... 10-81 VII. SERVICE MODE .................................. 10-82 A. Outline ............................................ 10-82 B. Using Service Mode ....................... 10-82 1. Starting Service Mode .............. 10-82 2. Selecting Service Mode ........... 10-82 C.
CHAPTER 1 GENERAL DESCRIPTION This chapter introduces the copier’s features and specifications, shows how to operate the copier, and explains how copies are made. I. FEATURES .............................................. 1-1 II. SPECIFICATIONS ................................... 1-2 A. Copier ................................................. 1-2 III. NAMES OF PARTS .................................. 1-8 A. External View ..................................... 1-8 B. Cross Section ...........................
CHAPTER 1 GENERAL DESCRIPTION I. FEATURES 1. The copier is designed light in weight (about 42 kg), and compact in size (566 mm wide, 541mm deep). 2. The copier turns out as many as 16 copies each minute (A4/LTR). 3. The addition of the Cassette Feeding Module-C1 (accessory) enables a source of paper capable of holding a maximum of 1,050 sheets. 4. The density may be adjusted to 33 different shades, or in automatic mode (AE). 5. The use of a photo mode promises faithful reproduction of halftone. 6.
CHAPTER 1 GENERAL DESCRIPTION II. SPECIFICATIONS A. Copier 1. Type Body Desktop Copyboard Fixed Light source Halogen lamp (120V:200W/230V:220W) Lens Lens array Photosensitive material OPC (30 dia.) 2. Mechanisms Copying Indirect electrostatic Charging Corona Exposure Slit (moving light source) Copy density adjustment Auto or manual Development Dry (toner projection) Auto Front cassette (1 pc.) Manual Multifeeder (5 mm deep approx.
CHAPTER 1 GENERAL DESCRIPTION 3. Performance Original type Sheet, book, 3-D object (2 kg max.) Maximum original size A3/279 × 432 mm (11"×17") Direct 1:1.000 Reduce I 1:0.5000 Reduce II 1:0.707 Reduce III 1:0.0816 Reproduction Reduce IV ratio Enlarge I 1:0.0865 1:1.154 Enlarge II 1:1.224 Enlarge III 1:1.414 Enlarge IV 1:2.000 Zoom 1:0.500 to 2.000 (in 1% increments) Wait time 30 sec or less (at 20°C room temperature) First copy 5.
CHAPTER 1 GENERAL DESCRIPTION Cassette Claws Used Frame 55 mm deep (500 sheets of 80 g/m2 paper; 250 sheets if B5) 100 sheets approx. (plain paper ; 64 to 80 g/m2) Copy tray Leading edge Direct 2.0 ±1.0 mm Non-image Trailing edge Direct 2.5 ±1.5 mm width Direct 2.5 ±2.
CHAPTER 1 GENERAL DESCRIPTION 4. Others Operating conditions Temperature 7.5° to 32.5°C/45.5° to 90.5°F Humidity 5% to 80% RH Atmospheric pressure 810.6 to 1013.3 hPa (0.8 to 1.0 atm) NP7160 NP7161 NLB xxxxx ---- ---- NLD xxxxx 127V NLC xxxxx ---- 230V PHQ xxxxx PHS xxxxx 120V Power source 120V (UL) Maximum Power consumption Standby Continuous Noise 1.5 kW or less 0.135 kWh (approx.; reference only) 0.645 kWh (approx.
CHAPTER 1 GENERAL DESCRIPTION Size Copy paper Copies/min A3 (297 × 420mm) A3 9 A4 (210 × 297mm) A4 16 B4 (257 × 364mm) B4 11 B5 (182 × 257mm) B5 17 A4R (297 × 210mm) A4R 13 B5R (257 × 182mm) B5R 14 I (70.7%) A3 → A4R A4R 11 B4 → B5R B5R 13 II (81.6%) B4 → A4R A4R 12 III (86.5%) A3 → B4 B4 10 A4 → B5 B5 17 I (200%) A5R → A3 A3 8 II (141.4%) A4R → A3 A3 8 B5R → B4 B4 9 III (122.4%) A4R → B4 B4 9 IV (115.
CHAPTER 1 GENERAL DESCRIPTION Reproduction mode Direct Reduce Enlarge Size Copy paper Copies/min 11" × 17" (279 × 432mm) 11" × 17" 9 LTR (297 × 216mm) LTR 16 LGL (216 × 356mm) LGL 11 LTRR (216 × 297mm) LTRR 13 I (64.7%) 11" × 17" → LTRR LTRR 12 II (73.3%) 11" × 17" → LGL LGL 11 III (78.6%) LGL → LTRR LTRR 12 I (200%) STMTR → 11" × 17" 11" × 17" 8 II (129.4%) LTRR → 11" × 17" 11" × 17" 8 III (121.
CHAPTER 1 GENERAL DESCRIPTION III. NAMES OF PARTS A.
CHAPTER 1 GENERAL DESCRIPTION B. Cross Section 1. Copier [1] [2] [3] [4] [5] [6] [26] [25] [24] [7] [8] [9] [10] [11] [12] [13] [14] [23] [22] [21] [20] [15] [19] [18] [17] [16] [1] No. 3 mirror [11] Dust-proofing glass [21] Transfer charging assembly [2] No. 2 mirror [12] Developing cylinder [22] Separation static eliminator [3] Scanning lamp [13] No. 4 mirror [23] Heat discharging roller [4] No. 1 mirror [14] No.
CHAPTER 1 GENERAL DESCRIPTION IV. OPERATING THE MACHINE A. Control Panel [1] [2] [3] [5] [6] [7] [8] [9] [10] [11] [4] Image Combination Fit Image Sort StapleSort Two-page Separation Photo Group A Max. 200% A4/LTR A3 B5 B4 A4/LTR B4 B4 A3 B5 A4/LTR 1:1 A3 B4 A4/LTR B5 B4 A4/LTR A3 A4/LTR B4 B5 Min.
CHAPTER 1 GENERAL DESCRIPTION Ref. Name Description Location indicator Flashes when the waste toner box needs to be replaced. When the case becomes full, it stops flashing and remains on. [11] Paper Size indicator Indicates the size of the paper in the cassette selected by the Paper Select key. [12] Paper Select key Press it to select Auto Paper Select*, Cassette, or Manual Feed Tray mode. [13] Copy Count/Ratio indicator Indicates the copy count/ratio and the selected user mode.
CHAPTER 1 GENERAL DESCRIPTION B. User Mode 1. Outline The copier provides user modes, which may be changed freely by the user. These modes provide the functions shown in the following table. Notation Item Description Factory settings (default) Resetting user mode Use it to reset new settings made in user mode to default settings. – Changing auto clear time Use it to set the auto clear time length between 1 an 9 min in 1-min increments. Setting it to 0 disables the auto-clear function.
CHAPTER 1 GENERAL DESCRIPTION Factory settings (default) Notation Item Description U09 Changing Page Fit mode (ratio) Use it to change the reproduction ratio used in Page Fit mode between 90% and 99% in 1% increments. U10 Changing Page Fit mode (centering) Use it to turn on/off the centering function in ON Fit Page mode. O N : Enable centering. OFF : Disable centering. U11 Changing Page Fit mode (non-image width) Use it to turn on/off the non-image width function in Page Fit mode.
CHAPTER 1 GENERAL DESCRIPTION V. ROUTINE MAINTENANCE (BY THE USER) 1. 2. 3. 4. 5. 6. Instruct the user to clean the following parts at least once a week. Copyboard Glass Wipe with a moist cloth (moistened with water or mild detergent solution); then, dry wipe. Copyboard Cover Wipe it with a moist cloth (moistened with water or mild detergent solution); then, dry wipe. Primary Charging Assembly Pull out and then push in the wire cleaner several times to clean the charging wire.
CHAPTER 1 GENERAL DESCRIPTION VI. POINTS TO NOTE (BY THE USER) • Toner Cartridge Instruct the user to dispose of any used (empty) toner cartridge according to governmental guidelines. • Waste Toner Box Instruct the user to keep any waste toner box for collection during a servicing visit. Caution: Do not dispose of the toner cartridge or the waste toner box into fire. Toner can catch fire, causing implosion or explosion. COPYRIGHT © 1998 CANON INC. CANON NP7160/NP7161 REV.0 AUG.
CHAPTER 1 GENERAL DESCRIPTION VII.IMAGE FORMATION A. Outline The copier is constructed as shown in Figure 1-701. Copyboard glass Scanning lamp Lens Developing assembly Blanking exposure Primary charging lamp assembly Pre-exposure Fixing assembly lamp Static Transfer charging eliminator assembly Pick-up (multifeeder) Pick-up (cassette) Figure 1-701 1–16 COPYRIGHT © 1998 CANON INC. CANON NP7160/NP7161 REV.0 AUG.
CHAPTER 1 GENERAL DESCRIPTION The copier's image formation processes consist of the following eight steps: Step 1 Pre-exposure Step 2 Primary charging (negative DC) Step 3 Image exposure Step 4 Development (AC + negative DC) Step 5 Transfer (negative DC) Step 6 Separation (curvature + static eliminator) Step 7 Fixing Step 8 Drum cleaning Static latent image formation block 2. Primary charging 3. Image exposure 1. Pre-exposure 4. Development Flow of copy paper Rotation of drum 8. Drum cleaning 5.
CHAPTER 2 BASIC OPERATION This chapter provides outlines of the copier’s various mechanical workings. Process speed I. BASIC MECHANISMS ............................. 2-1 A. Functional Construction ..................... 2-1 B. Outline of the Electrical Circuitry ........ 2-2 C. Basic Sequence of Operations .......... 2-4 D. Main Motor (M1) Control Circuitry ...... 2-8 COPYRIGHT © 1998 CANON INC. 105 mm/s E. Inputs to the DC Controller ................ 2-9 F. Outputs from the DC Controller .......
CHAPTER 2 BASIC OPERATION I. BASIC MECHANISMS A. Functional Construction The copier can broadly be divided into the following four functional blocks: pick-up, feeding, exposure, image formation, and control.
CHAPTER 2 BASIC OPERATION B. Outline of the Electrical Circuitry The copier's major electrical mechanisms are controlled by the microprocessor on the DC controller PCB. The ICs on the DC controller PCB are shown below. IC121 (ROM) • Controls copying sequence. JC113 (gate array) • Controls scanning lamp (LA1) error detection. • Controls thermistor (TH1, TH2) error detection. • Controls triac short circuit error detection. • Controls power at time of error. • Turns on/off the scanning lamp (LA3).
CHAPTER 2 BASIC OPERATION Sensors Switches DC controller PCB Toner sensor Motors IC119 (CPU) Fans AE sensor Thermistors Control panel Clutches IC121 (ROM) Solenoids IC116 (RAM) Counter IC117 (RESET) LEDs IC113 (GA) Charging assembly HVT IC114 (IPC) Developing cylinder Power supply PCB Lamp regulator PCB Scanning lamp Heaters Sensors Switches Cassette relay PCB Cassette feeding module Sensors Switches ADF controller PCB MicroIPC processor ADF Sensor
CHAPTER 2 BASIC OPERATION C. Basic Sequence of Operations 1.
CHAPTER 2 BASIC OPERATION Period Description Remarks WMUP (warm-up) From when the power switch is turned on until the surface temperature of the upper fixing roller reaches 120˚C. Waits until the upper fixing Moves the lens, mirror, roller warms up. and scanner to home position. WMUPR (warm-up rotation) From when WMUP ends until the surface temperature of the upper fixing roller reaches 160˚C. • Evens out the surface temperature of the upper fixing roller.
CHAPTER 2 BASIC OPERATION 2.
CHAPTER 2 BASIC OPERATION Period Description Remarks INTR (initial rotation) From when the Start key is pressed until the scanner starts to move forward. Stabilizes the drum sensitivity in preparation for copying operation. AER (AE rotation) From when the Start key is pressed until the scanner finishes measuring densuty. Measures the density of Used only in AE mode. the original while the scanner is moving forward. SCFW (scanner forward) While the scanner is moving forward.
CHAPTER 2 BASIC OPERATION D. Main Motor (M1) Control Circuitry 1. Outline Figure 2-105 shows the circuit used to control the main motor (M1), and the circuit has the following functions: • Turning on and off the main motor. • Controlling the rotation of the main motor.
CHAPTER 2 BASIC OPERATION E. Inputs to the DC Controller 1.
CHAPTER 2 BASIC OPERATION 2. Inputs to the DC Controller (2/3) DC controller PCB Right door open sensor PS11 J303 -1 -3 -2 Waste toner sensor Toner sensor J47 -1 -3 -3 -1 -2 -2 J48 -3 -1 -2 TS1 J15 -1 -3 -2 -2 -3 -1 J797 -5 -3 -7 -1 -6 -2 J107 -B5 -B7 -B6 HVT Power supply +5V J301 PCB J210 J212 J106 -9 -1 -10 -16 J721 -3 -3 -2 -2 -1 -1 J720 -3 -1 -2 -2 -1 -3 J102 -B3 -B2 -B1 +5V RDOPDT When the right door is closed, '1'. (When the light-blocking plate is at PS11.
CHAPTER 2 BASIC OPERATION 3. Inputs to the DC Controller (3/3) DC controller PCB AE sensor Cassette size switch PCB SW651 SW652 SW653 SW654 J531 -4 -1 -3 -2 -2 -3 -1 -4 J103 -A4 -A3 -A2 -A1 J16 -2 -3 -4 -5 -1 J110 -4 -3 -2 -1 -5 CSTS0 CSTS1 CSTS2 CSTS3 J108 -1 +5V +24V AE_DATA AE_REF Main thermistor See p. 5-7. TH1 When the temperature of the fixing roller increases, the voltage lowers. (analog signal) TH1_DT When the main thermistor is connected to the DC controller PCB, '1'.
CHAPTER 2 BASIC OPERATION F. Outputs from the DC Controller 1.
CHAPTER 2 BASIC OPERATION 2. Outputs from the DC Controller (2/4) Main motor Scanner motor Lens motor Mirror motor M1 M2 M3 M4 J601 -4 -1 -2 -3 J209 -4 -1 -2 -3 Power supply PCB +24V DC controller PCB J212 -9 -8 J106 -16 -17 MM_LKDT* MM_DR See p. 2-8. J37 -3 -1 -4 -2 -5 J104 -A3 -A5 -A2 -A4 -A1 SC_COM SC_A SC_A* SC_B SC_B* See p. 3-7. J38 -3 -3 -1 -5 -2 -4 -4 -2 -5 -1 J101 -A3 -A1 -A2 -A4 -A5 LNS_COM LNS_A LNS_A* LNS_B LNS_B* See p. 3-4.
CHAPTER 2 BASIC OPERATION 3. Outputs from the DC Controller (3/4) DC controller PCB FM1 Cooling fan 1 FM2 Exhaust fan 1 J14 -1 -3 -2 -2 -3 -1 J104 -B1 -B2 -B3 SCFAN_DR SCFAN_DT* J20 -1 -3 -2 -2 -3 -1 -B10 -B11 -B12 EXFAN1_DR EXFAN1_DT* See p. 7-2.
CHAPTER 2 BASIC OPERATION 4.
CHAPTER 2 BASIC OPERATION G. Inputs to and Outputs from Accessories (1/1) DC controller PCB J754 -4 -2 -3 -1 To ADF J750 -4 -4 -2 -2 -3 -3 -1 -1 J752 -9 -1 -1 -10 -2 -2 -11 -3 -3 -12 -4 -4 J755 -9 -10 -11 -12 To Sorter -4 -2 -3 -1 J753 -1 -1 -2 -2 -3 -3 -4 -4 J120 -1 -3 -2 -4 Accesory power J955 supply PCB -1 +24V1 -2 +24V2 -3 GND1 -4 GND2 J951 -1 -3 J952 -1 +24V1 -2 +24V2 -3 GND1 -4 GND2 J751 -4 -4 -2 -2 -3 -3 -1 -1 DF-TXD DF-RXD See the ADF Service Manual.
CHAPTER 3 EXPOSURE SYSTEM This chapter discusses the principles of operation used for the copier's lens drive unit and scanner drive unit. It also explains the timing at which these drive units are operated, and shows how they may be disassembled/assembled and adjusted. I. OUTLINE OF OPERATION ..................... 3-1 A. Changing the Reproduction Ratio ...... 3-1 II. LENS DRIVE SYSTEM ............................ 3-3 A. Driving the Lens ................................. 3-3 III. SCANNER DRIVE SYSTEM ....
CHAPTER 3 EXPOSURE SYSTEM I. OUTLINE OF OPERATION A. Changing the Reproduction Ratio The reproduction ratio in the axial direction of the photosensitive drum is varied by the lens drive system and the mirror drive system, and that in the peripheral direction of the photosensitive drum is changed by the scanner drive system.
CHAPTER 3 EXPOSURE SYSTEM Copyboard glass Enlarge/reduce Enlarge Reduse Lens No.4/No.5 mirror unit Photosensitive drum Figure 3-102 3–2 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 3 EXPOSURE SYSTEM II. LENS DRIVE SYSTEM A. Driving the Lens 1. Outline The lens is driven by the lens motor (M3) and the mirror motor (M4). As shown in Figure 3-201, when the lens motor rotates in normal direction, the lens moves in the direction of Enlarge by the drive coming through gears and drive belt. At this time, the No. 4/No.
CHAPTER 3 EXPOSURE SYSTEM 2. Motor Control Circuit The lens motor (M3) and the mirror motor (M4) are 4-phase stepping motors, and are controlled by the motor drive power supply signal (COM) and four drive pulse signals (A, B, A*, B*) generated by the DC controller PCB. The direction of rotation of the motor is switched by changing the timing at which the four drive pulse signals (A, B, A*, B*) are generated. The motor drive power supply signal (COM) is used to supply +24 V when rotating each motor.
CHAPTER 3 EXPOSURE SYSTEM 3. Moving the Lens The lens and the No. 4/ No. 5 mirror unit are moved with reference to the points at which the lens home position sensor (PS2) and the mirror home position sensor (PS3) turn on. The number of pulses (indicating the positions of the lens and the No. 4/ No. 5 mirror) applied to each motor is stored in memory by the microprocessor on the DC controller PCB. When the lens and the No. 4/ No.
CHAPTER 3 EXPOSURE SYSTEM III. SCANNER DRIVE SYSTEM A. Outline The scanner is driven by the scanner motor (M2) As shown in Figure 3-301, when the scanner motor rotates in reverse direction, the scanner moves forward by the drive coming through the gears, drive belt, and cable. The scanner motor is rotated in the opposite direction to move the scanner in reverse. The speed of rotation of the scanner motor when the scanner is moved forward is varied according to the selected reproduction ratio.
CHAPTER 3 EXPOSURE SYSTEM B. Scanner Motor Control Circuit The scanner motor (M2) is a 4-phase stepping motor, and is controlled by four pulse signals (SC_A, SC_B, SC_A*, SC_B*) generated by the DC controller PCB. The scanner motor is turned on/off and its direction of rotation are controlled by changing the timing at which these four pulse signals are generated. The speed of rotation, on the other hand, is controlled by switching the current supplied to the scanner motor.
CHAPTER 3 EXPOSURE SYSTEM D. Basic Sequence of Operations (scanner) The scanner is moved forward over a distance determined by the microprocessor based on the selected paper size, reproduction ratio, and copying mode. The microprocessor computes the dimensions of the original in reference to the selected paper size and reproduction ration to determine how much the scanner should be moved forward.
CHAPTER 3 EXPOSURE SYSTEM E.
CHAPTER 3 EXPOSURE SYSTEM IV. OTHERS A. Detecting the Original Size 1. Outline The NP7161 is equipped with auto paper selection and auto reproduction selection functions, and these functions require identification of the size of originals. To enable identification, the copier uses the following: • original size detection by the ADF (NP7161) 2. Detection of the Original Size by the ADF The size of originals is detected when originals are fed by the ADF. (For details, see the ADF Service Manual.
CHAPTER 3 EXPOSURE SYSTEM V. DISASSEMBLY/ASSEMBLY The copier may be disassembled and assembled as shown here. Pay attention to the copier's mechanical characteristics along with the steps for disassembly/assembly. Important: 1. Turn off the power and disconnect the power plug to ensure safety whenever disassembling/ assembling the copier. 2. Unless otherwise noted, assemble the parts by reversing the steps used to disassemble them. 3.
CHAPTER 3 EXPOSURE SYSTEM A. Scanner Drive Assembly 1. Removing the Scanner Motor 1) Remove the rear upper cover. 2) Disconnect the connector [1] and the two mounting screws [2]. [2] [1] Figure 3-501 3) Slide the scanner motor [3] to the right to detach from the motor mount; then, move it to the cut-off [A] to remove. [A] [3] Figure 3-502 3–12 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 3 EXPOSURE SYSTEM 2. Removing the Scanner Drive Cable 1) In standby state, press the Reduce key so that the lens and the No.4 /No.5 mirror unit move to 70% reproduction position. 2) Turn off the power switch, and disconnect the power plug. Caution: Whenever you need to perform disassembly/assembly work, be sure to turn it off and disconnect its power plug. 3) Remove the lens hood. (See p. 3-20.) 4) Remove the scanner motor. (See p. 3-12.) 5) Remove the control panel (See p. 7-13.
CHAPTER 3 EXPOSURE SYSTEM [6] 10) Remove the three mounting screws [4], and detach the motor base [5] and the timing belt [6]. [4] [5] Caution: When detaching the motor base, be sure to mark its position at its four corners. When mounting it, on the other hand, be sure to refer to these markings. Figure 3-504 11) Holding the bent [A], pull the scanner until it reaches the hole [B]; then, remove the two screws [7].
CHAPTER 3 EXPOSURE SYSTEM 3. Routing the Scanner Drive Cable Route the scanner drive cable following the sequence indicated in Figure 3-507, i.e., [1] through [7]. Be sure to adjust the mirror position and the tension as indicated later after routing the scanner drive cable. [3] [4] Secure temporarily. [1] Steel ball Wind 11 times. [2] [6] [5] [2] [7] [6] Figure 3-507 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 3 EXPOSURE SYSTEM 4. Adjusting the Position of the Mirror Be sure to adjust the position of the mirror as follows after you have mounted the scanner drive cable. 1) Keep the mirror positioning tool nearby. Arrange the mirror positioning tool (FY93009-050) as shown to adapt it to the copier. Figure 3-508a (Rear) Figure 3-508b (Front) 2) Fit the mirror positioning tool [1] to the No. 1 mirror base and the No. 2 mirror base (both front and rear).
CHAPTER 3 EXPOSURE SYSTEM 5. Adjusting the Tension of the Scanner Drive Cable Be sure to adjust the tension as follows after routing the scanner drive cable. 1) Move the scanner to home position. 2) Pull the center of the scanner drive cable with a spring gauge about 10 mm. At this time, adjust the position [A] of the tension spring [1] so that the reading of the spring gauge is 95 ±15 g. [A] [1] [1] Scanner 10mm 10mm Figure 3-510 COPYRIGHT © 1998 CANON INC. Figure 3-511 CANON NP7161/NP7160 REV.
CHAPTER 3 EXPOSURE SYSTEM B. Lens Drive Assembly 1. Removing the Lens Drive Motor 1) Remove the copyboard glass. (See p.7-14) 2) Holding the bend [A], slide out the scanner as far as the cut-off [B]. [B] [A] [B] Figure 3-512 3) Remove the inside cover and the delivery upper cover. (See p.7-11) 4) Disconnect the connector [1]. [1] Figure 3-513 5) Remove the two screws [2], and remove the lens motor [3]. [2] [3] [2] Figure 3-514 3–18 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 3 EXPOSURE SYSTEM 2. Removing the Mirror Motor 1) While the copier is in standby state, press the Enlarge key to move the lens and the No. 4/No. 5 mirror unit to 200% position. 2) Turn off the power switch, and disconnect the power plug. Caution: Whenever you are disassembling/ assembling the copier, be sure to turn off the power switch and disconnect the power plug. 3) Remove the copyboard glass. (See p.7-14) 4) Remove the developing assembly. (See p.4-37) 5) Remove the drum unit. (See p.
CHAPTER 3 EXPOSURE SYSTEM 8) Remove the two mounting screws [2], and remove the lens hood [3]. [2] Caution: When mounting the lens hood, take care not to trap the wire. [3] [2] Figure 3-516 9) Remove the two mounting screws [4], and remove the mirror motor [5]. [5] [4] Figure 3-517 3–20 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 4 IMAGE FORMATION SYSTEM This chapter discusses the principles of how images are formed. It also explains the timing at which the various units involved in image formation are operated, and shows how they may be disassembled/ assembled and adjusted. I. OUTLINE OF THE PROCESSES ............ 4-1 A. Outline ................................................ 4-1 B. Basic Sequence of Operations (image formation system) .................. 4-2 C. Controlling the Intensity of the Scanning Lamp .............
CHAPTER 4 IMAGE FORMATION SYSTEM I. OUTLINE OF THE PROCESSES A. Outline Figure 4-101 shows the copier's basic construction in reference to image formation. Image formation consists of the following functions: • Scanning lamp control • Primary corona current control • Transfer control current control • Separation static eliminator bias control • Developing bias control • Blank exposure lamp control Copy board glass Lamp regulator PCB No.2 mirror Lens Scanning lamp (LA1) No.
CHAPTER 4 IMAGE FORMATION SYSTEM B. Basic Sequence of Operations (image formation system) Start key ON Sequence STBY INTR AER SCFW SCRV SCFW SCRV LSTR STBY Main motor (M1) Primary charging assembly Developing DC bias Voltage control Developing AC bias Transfer charging assembly Static eliminator Pre-exposure lamp (LA2) Blank exposure lamp (LA3) Partial activation Scanning lamp (LA1) Figure 4-102 4–2 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 4 IMAGE FORMATION SYSTEM C. Controlling the Intensity of the Scanning Lamp 1. Outline Figure 4-103 shows the circuit used to control the intensity of the scanning lamp, and the circuit has the following functions: 1. Turning on/off the scanning lamp 2.
CHAPTER 4 IMAGE FORMATION SYSTEM 2. Operation a. Turning On/Off the Scanning Lamp When the scanning lamp drive signal (LMPDR) is ‘0’, the output of the control circuit goes ‘0’, keeping the drive circuit from turning on and therefore not supplying the scanning lamp (LA1) with AC power. When LMPDR is ‘1’, the output of the control circuit will be ‘1’, turning on the drive circuit and thereby supplying the scanning lamp (LA1) with AC power. b.
CHAPTER 4 IMAGE FORMATION SYSTEM 3. Protection Mechanisms To prevent malfunction of the scanning lamp (LA1), the copier is equipped with a fuse (FU1). If the temperature around the scanning lamp increases abnormally (about 141°C or more) because of a short circuit or the like, the thermal fuse (FU1) will melt to cut the power to the scanning lamp. COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 4 IMAGE FORMATION SYSTEM D. Controlling the Primary/Transfer Bias 1. Outline Figure 4-108 shows the circuit used to control the primary/transfer bias, and the circuit has the following functions: 1. Turning on/off the primary/transfer bias 2. Controlling the grid bias to a specific voltage 3.
CHAPTER 4 IMAGE FORMATION SYSTEM E. Controlling the Developing/Separation Static Eliminator Bias 1. Outline Figure 4-109 shows the circuit used to control the developing/static eliminating bias, and the circuit has the following functions: 1. Turning on/off the developing DC bias 2. Turning on/off the developing AC bias/separation static eliminator bias 3.
CHAPTER 4 IMAGE FORMATION SYSTEM 2. Turning On/Off the Developing DC Bias a. Turning On/Off the Developing DC Bias • When DV_DC_DR is 0, Oscillation control circuit turns off DC high-voltage transformer turns off The above condition deprives the developing cylinder of developing DC bias. • When DV_DC_DR is 1, Oscillation control circuit turns on DC high-voltage transformer turns on The above condition supplies the developing cylinder with developing DC bias. b.
CHAPTER 4 IMAGE FORMATION SYSTEM 3. Turning On/Off the Developing AC Bias/Separation Eliminator Bias a. Turning On/Off the Developing AC Bias • When DV_AC_DR is 0, control circuit turns off oscillation circuit turns off amplification circuit turns off AC high-voltage transformer turns off The above condition deprives the developing cylinder of developing AC bias.
CHAPTER 4 IMAGE FORMATION SYSTEM 4. Controlling the Developing DC Bias to a Specific Voltage to Suit Copy Density While copies are being made, developing AC bias and developing DC bias are applied to the developing cylinder. The developing AC bias is 1400 Vp-p, and the developing DC bias may be varied by sliding the Copy Density lever on the control panel. When the Copy Density lever on the control panel is slid, the CPY_DNS signal will vary between 1 and 5 V.
CHAPTER 4 IMAGE FORMATION SYSTEM Copy density F1 F1.25 F1.5 F1.75 F2 F2.25 F2.5 F2.75 F3 F3.25 F3.5 F3.75 F4 F4.25 F4.5 F4.75 F5 F5.25 F5.5 F5.75 F6 F6.25 F6.5 F6.75 F7 F7.25 F7.5 F7.75 F8 F8.25 F8.5 F8.75 F9 Developing DC bias [V] -110 -120 -130 -140 -150 -160 -170 -180 -190 -200 -210 -220 -230 -240 -250 -260 -270 -280 -290 -300 -310 -315 -330 -347.5 -365 -382.5 -400 -425 -450 -475 -500 -525 -550 CPY_DNS [V] 1.00 1.09 1.18 1.27 1.36 1.45 1.54 1.63 1.72 1.81 1.91 2.00 2.09 2.18 2.27 2.36 2.45 2.54 2.
CHAPTER 4 IMAGE FORMATION SYSTEM F. Controlling the Blank Exposure Lamp 1. Outline The blank exposure lamp is an LED array (40 built-in LEDs), and its activation is controlled by a static method. All LEDs of the blank exposure lamp are turned on while the photosensitive drum is rotating and, in addition, the scanner is not exposing an original so as to prevent adhesion of excess toner to the photosensitive drum.
CHAPTER 4 IMAGE FORMATION SYSTEM 2. Turning On the Blank Exposure Lamp in Reduce Mode While the original is being illuminated in Reduce mode, as many LEDs (both front and rear) as suited to the selected reduction ratio are turned on to blank out the non-image widths on the photosensitive drum regardless of the selected paper size. 3.
CHAPTER 4 IMAGE FORMATION SYSTEM II. DEVELOPING ASSEMBLY/DRUM CLEANER ASSEMBLY A. Outline The developing assembly and the drum cleaner are rotated by the drive from the main motor (M1) through drive gears. The level of toner inside the developing assembly is monitored by the toner sensor (TS1); when the amount drops below a specific level, the copier turns on or flashes the Toner indicator on the control panel.
CHAPTER 4 IMAGE FORMATION SYSTEM The copier is designed to collect more waste toner than existing models, and is equipped with a paddle at the bottom of the waste toner box. The paddle is linked to the movement of the cassette, and is designed to tap on the bottom of the waste toner box to even out the toner inside it. Waste toner assembly Paddle Paddle Waste toner assembly Cassette Waste toner assembly Paddle Figure 4-202 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 4 IMAGE FORMATION SYSTEM B. Detecting and Controlling the Level of Toner The toner inside the developing assembly is monitored by the toner sensor (TS1). The toner sensor uses a piezoelectric oscillator which oscillates in the absence of toner over the sensor at several kHz and sends an oscillation signal (TNEMP) to the DC controller PCB. In the presence of toner over the sensor, on the other hand, the weight will prevent oscillation.
CHAPTER 4 IMAGE FORMATION SYSTEM C. Monitoring the Waste Toner Feeding Screw If the waste toner inside the drum cartridge cakes and, as a result, hinders the rotation of the waste toner feeding screw, waste toner can start to leak from the pipe. To prevent such a problem, the copier is equipped with a waste toner feeding screw detection mechanism constructed as shown in Figure 4-206.
CHAPTER 4 IMAGE FORMATION SYSTEM D. Monitoring the Waste Toner Box The copier monitors the waste toner box in two levels. The amount of waste toner inside the waste toner box is checked by the waste toner sensor. The waste toner sensor is a pair of photosensors (light-emitting cell and light-receiving cell), and is designed to generate the waste toner full detection signal (TNFDT) when waste toner blocks the light between the two photosensors.
CHAPTER 4 IMAGE FORMATION SYSTEM When as many as 100 copies (A4) have been made during a pre-waste toner full condition, the DC controller PCB will identify the condition as “waste toner full,” stopping to flash the Waste Toner indicator and instead keeping it on. The copier will not accept the Start key while the Waste Toner indicator remains on.
CHAPTER 4 IMAGE FORMATION SYSTEM E. Control by the Cleaner Thermistor The copier is equipped with a thermistor (cleaner thermistor TH3) used to detect overheating of the drum cleaner assembly, and is designed to perform the following according to the temperature detected by the thermistor. • controlling the rotation of the exhaust fan (See p. 7-2.
CHAPTER 4 IMAGE FORMATION SYSTEM F. Auto Density Adjustment (AE) 1. Outline The copier is equipped with an automatic density adjustment mechanism (AE), which controls the developing DC bias to suit the density of originals. As long as the original is of even density, the AE mechanism is capable of ensuring copies free of fogging by changing the developing DC bias to suit the density of the original. 2.
CHAPTER 4 IMAGE FORMATION SYSTEM Figure 4-209 shows changes in the developing DC bias in relation to the density of different originals. If the density of the original is higher (darker) than the Test Sheet and lower (lighter) than a newspaper, the developing DC bias will vary between F5.0 and F7.5 in terms of Copy Density lever position. If the original is lighter than the Test Sheet, copies are made at an F5.
CHAPTER 4 IMAGE FORMATION SYSTEM III. DISASSEMBLY/ASSEMBLY The copier may be disassembled and assembled as shown here. Pay attention to the copier's mechanical characteristics along with the steps for disassembly/assembly. Important: 1. Turn off the power and disconnect the power plug to ensure safety whenever disassembling/ assembling the copier. 2. Unless otherwise noted, assemble the parts by reversing the steps used to disassemble them. 3.
CHAPTER 4 IMAGE FORMATION SYSTEM A. Scanning Lamp Assembly 1. Removing the Scanning Lamp 1) Remove the copyboard glass. (See .7-14) 2) Holding the bend [A], pull out the scanner as far as the cut-off [B]. [B] [A] [B] Figure 4-301 3) Remove the mounting screw [1], and remove the reflecting cover [2]. [1] [2] Figure 4-302 4–24 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 4 IMAGE FORMATION SYSTEM 4) Wrap both ends of the scanning lamp [3] with lint-free paper. Then, remove the lamp while pushing toward the rear end. Caution: 1. Do not work if the surface of the scanning lamp is hot. 2. Do not leave fingerprints on the surface of the scanning lamp. 3. If the surface of the scanning lamp is soiled, dry wipe it. 4. Do not leave fingerprints on the reflecting cover. 5. Do not deform the reflecting cover. 2.
CHAPTER 4 IMAGE FORMATION SYSTEM B. Exposure Assembly 1. Removing the Pre-Exposure/Blank Exposure Lamp Assembly 1) Remove the developing assembly. (See p.4-37) 2) Remove the drum unit. (See p.4-28) 3) Remove the inside over. 4) Disconnect the two connectors [1], and remove the mounting screw [2] ; then, remove the pre-exposure/blank exposure lamp assembly [3]. [3] [2] [1] Figure 4-306 2. Removing the Dust-Proofing Glass 1) Remove the inside cover.
CHAPTER 4 IMAGE FORMATION SYSTEM 3. Cleaning the No. 6 Mirror 1) Remove the developing assembly. (See p. 4-37.) 2) Remove the drum unit. (See p. 4-28.) 3) Remove the dust-proofing glass. (See p. 4-26.) 4) Remove the mounting screw [1], and remove the developing assembly rail [2]. [1] [2] Figure 4-308 5) Clean the No. 6 mirror [3]. [3] Figure 4-309 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 4 IMAGE FORMATION SYSTEM C. Drum Unit 1. Removing the Drum Unit 1) Open the top unit, release the developing assembly. 2) Remove the thumb screw [1], and slide out the drum unit [2] to the front to remove. Caution: • The photosensitive drum is susceptible to strong light. If it was subjected to strong light for a long time, it can cause copies to have white spots or black lines. Whenever you have taken out the drum unit from the copier, be sure to keep it in the bag used at time of installation.
CHAPTER 4 IMAGE FORMATION SYSTEM 2. Cleaning the Photosensitive Drum If the surface of the photosensitive drum is soiled, wipe it with a flannel cloth coated with toner. Caution: • Do not dry wipe the surface of the photosensitive drum. Do not use solvent. • Do not use paper, lint-free or otherwise, to avoid damaging the surface of the photosensitive drum. • Work briskly when cleaning the photosensitive drum to avoid unnecessarily subjecting it to light and thus affecting images.
CHAPTER 4 IMAGE FORMATION SYSTEM D. Primary Charging Assembly 1. Removing the Primary Charging Assembly 1) Remove the drum unit. (See p. 4-28.) 2) Pull the charging wire cleaning lever [1] slightly to the front. 3) Detach the hook [2], and detach the drum front cover [3]. [3] [2] [1] Figure 4-312 4) Remove the mounting screw [4], and remove the primary charging assembly [5]. [5] [4] Figure 4-313 4–30 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 4 IMAGE FORMATION SYSTEM E. Transfer Charging Assembly 1. Removing the Transfer Charging Assembly 1) Open the copier top, and remove the front door. 2) Pull the charging wire cleaning lever [1] slightly to the front. 3) Remove the mounting screw [2], and lift the stopper [3] to remove. 4) Pull the transfer charging assembly [4] to the front to remove. [4] [1] [2] [3] Figure 4-314 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 4 IMAGE FORMATION SYSTEM F. Charging Wire 1. Outline As many as two charging wires are located around the photosensitive drum. (These charging wires are 0.06 mm in diameter.) 2. Stringing the Charging Wires Basically, all charging wires are strung in the same way. (The following uses the primary charging wire as an example.) 1) Remove the mounting screw [1], and remove the stopper [2] and the grid plate [3].
CHAPTER 4 IMAGE FORMATION SYSTEM 2) Remove the sheet (front) [4] and the sheet (rear) [5]. To remove the transfer charging assembly, remove the sheet (front) [c] and the sheet (rear) [d]. • Primary Charging Assembly • Transfer Charging Assembly [c] [5] [d] [4] Figure 4-316a Figure 4-316b 3) Remove the spring [6], and remove the charging wire [7]. To remove the transfer charging assembly, remove the spring [e], and remove the charging wire [f].
CHAPTER 4 IMAGE FORMATION SYSTEM 4) Free a length of about 5 cm from the charging wire reel (0.06 mm wire). Reference: To form a loop, wind the charging wire around a hex key once, and turn the hex key three to four times; then, twist the charging wire. 5) Cut the end (excess) of the twisted charging wire with a nipper. 6) Hook the loop on the charging electrode at the rear.
CHAPTER 4 IMAGE FORMATION SYSTEM 8) Cut the excess charging wire with a nipper. 9) Pick the end of the charging wire tensioning spring with tweezers, and hook it on the charging electrode. Figure 4-320 Note: Go through the following: • Be sure that the charging wire is free of bending and twisting, and its gold plating has not peeled. • Be sure that the charging wire is in the V-groove of the charging wire positioner.
CHAPTER 4 IMAGE FORMATION SYSTEM 3. Adjusting the Height of the Charging Wires To adjust each charging wire, turn its respective height adjusting screw. A full turn on the screw will change the height of the primary charging wire by about 0.5 mm and that of the transfer charging wire by about 0.7 mm. Charging assembly Height of charging wire (mm) Range 11.0 0.2mm Primary Transfer 1.0mm 1.0mm 9.5 0.
CHAPTER 4 IMAGE FORMATION SYSTEM G. Developing Assembly [2] [1] [3] 1. Removing the Developing Assembly 1) Open the front door, and release the developing assembly. 2) Remove the mounting screw [1], and remove the stopper [2]. 3) Pull the developing assembly [3] to remove. Figure 4-324 Caution: Take care not to damage the developing cylinder. 2. Removing the Developing Blade 1) Remove the developing assembly.
CHAPTER 4 IMAGE FORMATION SYSTEM 4) Lift the front of the developing upper cover [6] slightly, and slide it in the direction of the arrow to remove. [6] Figure 4-327 5) Place a newspaper or the like on the floor, and empty the developing assembly of toner. 6) Put copy paper between the developing blade and the developing cylinder. 7) Remove the two mounting screws [7], and remove the developing blade [8].
CHAPTER 4 IMAGE FORMATION SYSTEM 3) Remove the grip ring [3], and remove the developing roll [4]. 4) Remove the two mounting screws [5], and remove the bearing holder (front) [6] and the bearing [7]. [5] [7] [6] [3] [4] [5] Figure 4-330 5) Remove the two mounting screws [8], and remove the gear support plate [9]. Caution: Take extra care when removing the gear support plate. The gear will be freed. [8] [9] Figure 4-331 6) Remove the E-ring [10], and remove the gear [11].
CHAPTER 4 IMAGE FORMATION SYSTEM 9) Remove the two mounting screws [15]; then, remove the bearing holder (rear) [16], bearing [17], and developing roll [18]. [15] [16] [17] [18] Figure 4-333 10) Remove the developing cylinder [19]. Caution Do not leave fingerprints or oils on the surface of the developing cylinder. As necessary, dry wipe the surface with lint-free paper. 4–40 COPYRIGHT © 1998 CANON INC. [19] Figure 4-334 CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 5 PICK-UP/FEEDING SYSTEM This chapter explains the principles used from when copy paper is picked up to when a copy is delivered in view of the functions of electrical and mechanical units and in relation to their timing of operation. It also shows how these units may be disassembled/assembled and adjusted. I. OUTLINE OF OPERATION ..................... 5-1 II. PICK-UP FROM THE CASSETTE .......... 5-2 A. Pick-Up Operation .............................. 5-2 B.
CHAPTER 5 PICK-UP/FEEDING SYSTEM I. OUTLINE OF OPERATION The copier uses a center reference feeding method, in which copy paper is moved along the center of the pick-up/feeding path to ensure stable movement. The pick-up system consists of the cassette No. 1 holder and the multifeeder.
CHAPTER 5 PICK-UP/FEEDING SYSTEM II. PICK-UP FROM THE CASSETTE A. Pick-Up Operation The pick-up roller and the feed roller are controlled by the pick-up solenoid (SL1). The stack of copy paper inside the cassette is held up by the lifter, and the pick-up roller is controlled by the pick-up solenoid and is kept away from the surface of the stack.
CHAPTER 5 PICK-UP/FEEDING SYSTEM B. Sequence of Operations (pick-up/feeding) • A4, 2 Copies Start key ON Sequence STBY INTR AER SCFW SCRV FW RV SCFW SCRV LSTR STBY Main motor (M1) Scanner motor (M2) Scanner home position sensor (PS1) Pick-up solenoid (SL1) Registlation paper sensor (PS5) Registlation roller clutch (CL1) Feed roller clutch (CL2) Delivery paper sensor (PS6) Figure 5-202 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 5 PICK-UP/FEEDING SYSTEM C. Operation of the Cassette Lifter When the cassette is pushed inside the copier, the lifter stopper will be freed, and the lifter will move up by the force of a spring. At this time, the copy paper will push up the paper detecting lever of the cassette paper sensor (PS4) to enable detection of the presence/absence of copy paper. The rear end guide plate is slid in conjunction with the upward movement of the lifter to improve pick-up performance.
CHAPTER 5 PICK-UP/FEEDING SYSTEM The copier’s cassette is designed to apply auxiliary pressure on paper of B4 or wider. The auxiliary tension spring acts on the lifter through the cut-off in the bottom of the cassette when the side guide plate is slid to the outside. In the case of paper narrower than B4, the spring remains slack and therefore does not act on the lifter. Auxiliary pressure spring Cut-off Auxiliary pressure lever Lifter Figure 5-206 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.
CHAPTER 5 PICK-UP/FEEDING SYSTEM D. Detecting the Size of the Cassette 1. Outline The presence of paper and the size of paper inside the cassette are checked by the cassette size switch PCB mounted to the left of the cassette slot. When the cassette is set in the copier, the cassette paper size switching block and the AB/ Inch switching block act on the cassette size switch PCB to enable detection of the presence/ absence of a cassette and the size of paper inside it.
CHAPTER 5 PICK-UP/FEEDING SYSTEM 2. Detecting the Cassette Size The AB configuration and the Inch configuration are distinguished by the switch (SW654) on the cassette switching PCB. The size of the paper inside the cassette is identified with reference to the states (on/off) of the switches (SW651 through 653) on the cassette size switch PCB. Table 5-201 shows the combinations used to identify specific paper sizes.
CHAPTER 5 PICK-UP/FEEDING SYSTEM III. PICK-UP FROM THE MULTIFEEDER A. Pick-Up Operation The presence/absence of copy paper in the multifeeder is detected by the multifeeder paper sensor (PS7). When the multifeeder is selected and the Start key is pressed, the multifeeder solenoid (SL2) turns on to butt the paper guide plate against the multifeeder pick-up roller. Then, the multifeeder roller clutch (CL3) turns on to transmit the drive of the main motor (M1) to the multifeeder pick-up roller.
CHAPTER 5 PICK-UP/FEEDING SYSTEM B. Detecting the Size of Paper in the Multifeeder When the user sets the slide guide of the multifeeder to the width of copy paper, the multifeeder paper width sensor 1 (PS9) and the multifeeder paper width sensor (PS10) operating in conjunction with the movement of the side guide detect the width of the copy paper. The identified width is used for blank exposure and fixing temperature control.
CHAPTER 5 PICK-UP/FEEDING SYSTEM C. Sequence of Operations (pick-up from multifeeder) • A4, 2 Copies Start key ON Sequence STBY INTR AER SCFW SCRV FW RV SCFW SCRV LSTR STBY Main motor (M1) Scanner motor (M2) Scanner home position sensor (PS1) Multifeed solenoid (SL2) Registration paper sensor (PS5) Registration roller clutch (CL1) Multifeed roller clutch (CL3) Delivery paper sensor (PS6) Figure 5-303 5–10 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 5 PICK-UP/FEEDING SYSTEM IV. CONTROLLING THE REGISTRATION CLUTCH The registration clutch exerts the following control so as to match copy paper with the image on the photosensitive drum at a specific location. Selected copy mode Control timing Standard copying A Page separation A Centering OFF A Centering ON B Image area on copy paper Remarks The size of margin C varies to suit the selected reproduction ratio and copy paper size. The size of margin D is 21.6 mm maximum.
CHAPTER 5 PICK-UP/FEEDING SYSTEM V. DETECTING JAMS A. Outline The copier is equipped with the following two sensors used to check the movement of copy paper. • Registration paper sensor (PS5) • Delivery paper sensor (PS6) Jams are identified in relation to the presence/absence of copy paper over each sensor at such times as programmed in the microprocessor. As soon as a jam is identified, the microprocessor will immediately stop the operation, and flash the Jam indicator on the control panel.
CHAPTER 5 PICK-UP/FEEDING SYSTEM B. Sequence of Operations (jam detection) 1. Registration Delay Jam Start key ON Sequence STBY Jam indicator flashed INTR SCFW approx 1.5sec Jam check SCRV SCFW approx 1.5sec Pick-up solenoid (SL1) Feed roller clutch (CL2) Registration paper sensor (PS5) Normal Error Main motor (M1) Figure 5-502 2.
CHAPTER 5 PICK-UP/FEEDING SYSTEM 3. Delivery Delay Jam Start key ON Sequence STBY Jam indicator flashed INTR SCFW SCRV approx 2.2sec Jam check SCFW SCRV approx 2.2sec Registration roller clutch (CL1) Normal Delivery paper sensor (PS6) Error Main motor (M1) Figure 5-504 4.
CHAPTER 5 PICK-UP/FEEDING SYSTEM VI. DISASSEMBLY/ASSEMBLY The copier may be disassembled and assembled as shown here. Pay attention to the copier’s mechanical characteristics along with the steps for disassembly/assembly. Important: 1. Turn off the power and disconnect the power plug to ensure safety whenever disassembling/ assembling the copier. 2. Unless otherwise noted, assemble the parts by reversing the steps used to disassemble them. 3.
CHAPTER 5 PICK-UP/FEEDING SYSTEM A. Pick-Up Assembly 1. Removing the Pick-Up Roller 1) Remove the cassette. 2) Remove the stepped screw [1], and pull the roller support plate [2] to the front to remove. 3) Remove the pick-up roller assembly [3]. [3] [1] [2] Figure 5-601 4) Push the section indicated by an arrow, and remove the two pick-up rollers [4]. [4] Figure 5-602 2.
CHAPTER 5 PICK-UP/FEEDING SYSTEM 3. Removing the Pick-Up Drive Assembly 1) Remove the registration roller assembly. (See p. 5-23.) 2) Remove the E-ring [1], and slide the vertical path roll [2] in the direction of the arrow. 3) Remove the bushing [3], and then vertical path roller [2] together with the gear [4]. [1] [3] [2] [2] [4] Figure 5-603 4) Remove the four mounting screws [5], and remove the pick-up drive assembly [6]. [5] [6] [5] Figure 5-604 4.
CHAPTER 5 PICK-UP/FEEDING SYSTEM 4) Slide the pick-up assembly [3] to the rear, and remove the hook. [3] Figure 5-606 5. Removing the Feed Roller 1) Remove the separation roller assembly. 2) While holding the claw [A], move the feed roller [2] in the direction of the arrow to remove. [A] [2] Figure 5-607 6. 1) 2) 3) Removing the Separation Roller Remove the cassette. Remove the right door. (See p.7-10) Remove the two mounting screws [1], and remove the separation roller assembly [2].
CHAPTER 5 PICK-UP/FEEDING SYSTEM 4) Remove the roller cover [3]. [3] Figure 5-609 [5] 5) Remove the two bushings [4], and remove the two springs [5]. [4] Figure 5-610 [6] 6) While pushing the claw [A] with a flatblade screwdriver, remove the separation roller [6]. [A] Figure 5-611 7.
CHAPTER 5 PICK-UP/FEEDING SYSTEM B. Multifeeder Assembly 1. Removing the Multifeeder Tray 1) Open the multifeeder tray, and remove the face cover [1] using a flat-blade screwdriver. [1] Figure 5-613 2) Remove the guide pin [2], and remove the multifeeder tray [3]. [2] [3] Figure 5-614 2. Removing the Multifeeder Assembly 1) Remove the rear cover, and open the right door. 2) Remove the lower inside cover. (See p.712.) 3) Disconnect the two connectors [1], and remove the mounting screw [2].
CHAPTER 5 PICK-UP/FEEDING SYSTEM 4) Disconnect the two connectors [3], and remove the three mounting screws [4]; then, detach the multifeeder assembly [5]. [3] The two holes each (upper/lower) are spare holes. [5] [4] [4] Figure 5-616 3. Removing the Multifeeder Pick-Up Roller 1) Remove the developing assembly. (See p. 4-37.) 2) Remove the drum unit. (See p. 4-28.
CHAPTER 5 PICK-UP/FEEDING SYSTEM 2) Turn off the copier, and disconnect the power plug. Caution: Whenever you need to perform disassembly/assembly work, be sure to turn off the copier and disconnect its power plug. [2] [3] 3) Open the right door. 4) Remove the mounting screw [2], and slide the multifeeder separation pad assembly [3] in the direction of the arrow to remove. Figure 5-619 [4] [5] 5) Detach the multifeeder separation pad [5] from the holder [4]. Figure 5-620 5.
CHAPTER 5 PICK-UP/FEEDING SYSTEM C. Registration Roller Assembly [1] 1. Removing the Registration Roller Assembly 1) Remove the developing assembly. (See p. 4-37.) 2) Remove the drum unit. (See p. 4-28.) 3) Remove the multifeeder assembly. (See p. 5-20.) 4) Disconnect the connector [1], and remove the grip right [2]; then, detach the registration roller clutch [3].
CHAPTER 5 PICK-UP/FEEDING SYSTEM D. Cassette Assembly 1. Removing the Cassette Size Switch 1) Remove the cassette. 2) Remove the delivery lower cover. (See p.7-11) 3) Disconnect the connector [1] (J110) of the DC controller PCB, and remove the mounting screw [2] ; then, free the harness from the harness guide. [2] [1] Figure 5-624 [3] [5] [4] 4) Remove the mounting screw [3], and remove the stopper [4]. 5) Remove the cassette switch assembly [5].
CHAPTER 5 PICK-UP/FEEDING SYSTEM 2. Changing the Cassette Size (AB/ INCH) 1) Slide out the cassette. 2) Loosen the mounting screw [1] on the left side of the cassette; then, slide the size switching block [2] to the desired size position, and fix it in place. •AB [2] [1] [2] [1] •INCH Figure 5-627 3) Remove the mounting screw [3]; then, slide the size switching lever [4] to the desired size position, and fix it in place. •AB [4] [3] [4] [3] •INCH Figure 5-628 COPYRIGHT © 1998 CANON INC.
CHAPTER 5 PICK-UP/FEEDING SYSTEM 3. Adjusting the Left/Right Registration Turn the adjusting screw [1] until the cassette locking lever plate [2] and the cassette locking lever [3] engage. When the adjusting screw [1] is turned clockwise, the cassette locking plate moves to the front. When the adjusting screw [1] is turned counterclockwise, the cassette locking lever plate [2] moves to the rear. [1] [2] [3] Figure 5-629 (-) (+) 0 2 4 6 8 10 Figure 5-630 5–26 COPYRIGHT © 1998 CANON INC.
CHAPTER 6 FIXING SYSTEM This chapter explains the principles used to fuse toner images to transfer medium in view of the functions of electrical and mechanical units and in relation to their timing of operation. It also shows how these units may be disassembled/assembled and adjusted. I. OUTLINE OF OPERATION ..................... 6-1 A. Outline ................................................ 6-1 B. Controlling the Fixing Temperature ... 6-2 C. Error Detection Circuit ........................
CHAPTER 6 FIXING SYSTEM I. OUTLINE OF OPERATION A. Outline The upper roller and the lower roller of the fixing assembly and the delivery roller of the delivery assembly are operated by the drive from the main motor (M1) coming through gears. The upper roller has a built-in heater which is kept on during WMUP after power-on at 1000 W (120 V)/1050 W (230 V). Other than WMUP, the heater is subjected to phase control, and is turned on at 805 w (120/230 V) or off.
CHAPTER 6 FIXING SYSTEM B. Controlling the Fixing Temperature The copier uses two thermistors mounted at the rear ends of the upper roller to monitor surface temperature. When copies are made continuously using sheets of B4 or less, the temperature of the area (center) coming into contact with the paper will be lower than the temperature of the areas (ends) not coming into contact with the paper.
CHAPTER 6 FIXING SYSTEM • 182 mm > Paper Width Temperature detected by thermistor at Start key on Target temperature immediately after Start key on General plain paper Paper with rough surface Target temperature during continuous copying (upper limit) Tracing paper Less than 170°C 175°C 196°C 165°C 170°C or more, less than 180°C 186°C 204°C 176°C 180°C or more, less than 190°C 194°C 208°C 184°C 190°C or more 200°C 215°C 190°C General plain paper Paper with rough surface 200°C 215°C T
CHAPTER 6 FIXING SYSTEM • Power Save Key ON or Auto-Power OFF Start key ON Sequence STBY INTR Energy saver Auto power key ON OFF COPY LSTR STBY *2 Energy saver indicator Main motor (M1) Target temperature control Fixing heater (H1) 220°C *1 200°C 180°C 160°C 140°C 120°C *1:Varies according to paper width. *2:May be varied in user mode. Figure 6-103 6–4 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 6 FIXING SYSTEM C. Error Detection Circuit 1.
CHAPTER 6 FIXING SYSTEM 2. Surface Temperature of the Fixing Upper Roller The main thermistor (TH1) and the sub thermistor are arranged nearby at the rear of the fixing upper roller, and are used to monitor the difference in voltage between two thermistor signals (TH1, TH2). If either thermistor suffers an open circuit, the CW input terminal of the differential amplifier circuit will be about 5 V.
CHAPTER 6 FIXING SYSTEM II. DISASSEMBLY/ASSEMBLY The copier may be disassembled and assembled as shown here. Pay attention to the copier’s mechanical characteristics along with the steps for disassembly/assembly. Important: 1. Turn off the power and disconnect the power plug to ensure safety whenever disassembling/assembling the copier. 2. Unless otherwise noted, assemble the parts by reversing the steps used to disassemble them. 3.
CHAPTER 6 FIXING SYSTEM A. Fixing Assembly 1. [1] [2] [3] [4] [1] Construction Upper roller Lower roller Heat discharge roller Delivery roller [4] [2] [3] Figure 6-201 2. Locking Mechanism Fulcrum Locking arm Figure 6-202 [1] 3. Removing the Fixing Assembly 1) Remove the rear cover. 2) Disconnect the connector [1]. Figure 6-203 6–8 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 6 FIXING SYSTEM 3) Remove the drum unit. (See p. 4-28.) 4) Remove the delivery upper cover. (See p. 7-11.) 5) Remove the delivery lower cover. (See p. 7-11.) 6) Disconnect the two connectors [2] (J108, J109) on the DC controller PCB, and free the wires from the harness guide. [2] Figure 6-204 7) Remove the front door. 8) Turn the screw [3] counterclockwise, and remove the fixing knob [4]. 9) Remove the two mounting screws [5], and remove the fixing front cover [6].
CHAPTER 6 FIXING SYSTEM 12) Lift the front of the fixing assembly [9] slightly to remove. Caution: When removing the fixing assembly, take care not to damage the feeding assembly. [9] Figure 6-207 [1] 4. Removing the Fixing Heater 1) Remove the fixing assembly. (See p. 6-8.) 2) Disconnect the two connectors [1], and free the harness from the harness guide. 3) Remove the mounting screw [2], and detach the heater support plate (front) [3].
CHAPTER 6 FIXING SYSTEM 7) Free the harness from the harness retainer [9]. 8) Remove the two mounting screws [10], and detach the heater support plate (rear) [11]. [10] [9] [11] [10] Figure 6-210 9) Free the harness from the harness guide [12], and detach the fixing heater [13]. Caution: 1.Do not start work if the surface of the fixing heater is hot. 2.Do not touch the surface of the fixing heater. 3.If the surface of the fixing heater is soiled, dry wipe it. 5.
CHAPTER 6 FIXING SYSTEM 3) Remove the mounting screw [2], and detach the thermal switch assembly [3]. [2] [3] Figure 6-213 6. Removing the Main Thermistor 1) Remove the fixing assembly. (See p. 6-8.) 2) Remove the mounting screw [1], and free the harness from the harness guide; then, detach the main thermistor [2]. [2] [1] Figure 6-214 7. Removing the Sub Thermistor 1) Remove the fixing assembly. (See p. 6-8.
CHAPTER 6 FIXING SYSTEM 4) Remove the mounting screw [2]. 5) Free the harness from the harness guide, and remove the sub thermistor [3]. [3] [2] Figure 6-217 [2] 8. Removing the Fixing Upper Roller 1) Remove the fixing heater. (See p. 6-10.) 2) Remove the upper delivery assembly. (See p. 6-16.) 3) Remove the lower delivery assembly (See p. 6-17.) 4) Remove the three mounting screws [1], and remove the fixing upper inlet guide assembly [2].
CHAPTER 6 FIXING SYSTEM 9. Removing the Fixing Lower Roller 1) Remove the fixing upper roller. (See p. 613.) 2) Remove the bearing [1] and the fixing lower roller [2]. [1] [2] [1] Figure 6-221 10. Removing the Heat Discharge Roller 1) Remove the fixing assembly. (See p. 6-8.) 2) Remove the two mounting screws [1], and detach the fixing inlet guide assembly [2]. [1] [1] [2] Figure 6-222 3) Remove the heat discharge roller [3].
CHAPTER 6 FIXING SYSTEM 12. Adjusting the Nip The nip is appropriate if it is as indicated in Table 6-201. If it is not as indicated, relocate the tension spring [1]. [1] [1] Note: a and c are points 10 mm from both ends of copy paper. Figure 6-225 Feeding direction A3 size c b Center of copy paper a Figure 6-226 a. Dimensions Measurements* b 4.8 ± 0.3mm Ia-cI 0.5mm or less *Be sure both upper and lower rollers are sufficiently warm before taking measurements.
CHAPTER 6 FIXING SYSTEM B. Delivery Assembly [A] 1. Removing the Upper Separation Claw 1) Remove the fixing assembly. (See p. 6-8.) 2) Remove the stepped screw [1], and detach the bend [A]); then, detach the upper delivery assembly [2]. [2] [1] Figure 6-227 3) Remove the two stepped screws [3], and slide the upper separation claw assembly [4] in the direction of the arrow to remove. [3] [3] [4] Figure 6-228 4) Detach the spring [5], and detach the upper separation claw [6].
CHAPTER 6 FIXING SYSTEM [4] 3) Detach the spring [3], and detach the lower separation claw [4]. [3] Figure 6-231 3. Removing the Delivery Roller 1) Remove the two tension springs [1] and the two mounting screws [2]; then, remove the delivery roller assembly [3]. [2] [1] [3] [1] [2] Figure 6-232 2) Remove the grip ring [4], and remove the gear [5]. 3) Remove the two E-rings [6] and the two bushings [7]; then, detach the delivery roller [8].
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS This chapter shows the copier's external parts, and explains the principles used for the copier's various control mechanisms in view of the functions of electrical and mechanical units and in relation to their timing of operation. It also shows how these units may be disassembled/assembled and adjusted. I. FANS ........................................................ 7-1 II. POWER SUPPLY ..................................... 7-4 A. Outline of Power Supply ..........
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS I. FANS The copier is equipped with three fans for cooling and discharging ozone. When a sorter is installed, the vent for the exhaust fan (FM2, FM4) is blocked, preventing discharge of ozone to the left of the copier. To enable discharge, use a sorter kit fan (FM5) to the front of the copier to route the ozone from the exhaust fan (FM2, FM4) to the front. Table 7-101 shows the function of each fan and the orientation of the fan.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS The exhaust fan (FM2) and the sorter kit fan (FM5) are rotated at half speed during standby to prevent heating inside the machine. If the reading of the cleaner thermistor (TH3) is 50°C or more (38°C or more if the sorter kit is installed), all fans will be rotated at full speed.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS If the heat exhaust fan rotation detection signal (FM2ROT) is not detected 0.5 sec after the exhaust fan (FM2, FM4) starts to rotate, error code E805 will be indicated on the control panel. COPYRIGHT © 1998 CANON INC. CANON NP7160/NP7161 REV.0 AUG.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS II. POWER SUPPLY A. Outline of Power Supply Figure 7-201 is a block diagram showing distribution of power inside the machine.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS B. Power Supply Circuitry 1. AC Power Supply AC power is supplied to the power supply PCB when the power plug is connected and the front door switch (DS1) is turned on. 2. DC Power Supply The power supply PCB provides three types of DC outputs: +24 V, +5 VR, and +5 VU. When the power plug is connected and the front door switch (DS1) is turned on, the power supply PCB supplies the DC controller PCB with +5 VR.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS 3. Mirror Heater, Cassette/Drum Heater, and Accessory Cassette Heater The following three heaters are made available as accessories to the copier, designed to prevent condensation of the scanner and the drum and to keep paper inside the cassette dry. Table 7-201 shows the function of each heater. Figure 7-202 shows the timing at which each heater turns on. Notation Function Name H2 Mirror heater Prevents condensation on the scanner.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS C. Protection Mechanisms of the Power Supply Circuitry The copier’s power supply PCB is equipped with a circuit breaker (CB1, CB2) and a fuse (FU1, FU2) on its AC input side. To protect against overcurrent and over voltage, the copier is also equipped with an overcurrent protection circuit and an over-voltage protection circuit.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS III. DISASSEMBLY/ASSEMBLY The copier may be disassembled and assembled as shown here. Pay attention to the copier’s mechanical characteristics along with the steps for disassembly/assembly. Important: 1. Turn off the power and disconnect the power plug to ensure safety whenever disassembling/assembling the copier. 2. Unless otherwise noted, assemble the parts by reversing the steps used to disassemble them. 3.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS A. External Covers [1] [2] [3] [4] [5] [6] [7] [8] [9] [3] Front cover Right door (5) Upper right cover (2) Right cover (2) Rear cover (5) Upper rear cover (4) Upper left cover (2) Delivery lower cover (2) Delivery upper cover (2) [4] [2] [1] Figure 7-301 [6] [7] The number in parentheses indicates the number of mounting screws used.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS Remove the appropriate covers as follows when cleaning, checking, or repairing the inside of the copier. Covers which may be detached by mere removal of mounting screws are omitted from the discussions. 1. Removing the Right Door 1) Open the right door. 2) Remove the four mounting screws [1], and remove the right door [2] and the paper guide [3]. [4] Caution: When mounting the paper guide, be sure to fit the foot of the spring [4] at the rear into its hole.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS 3. Removing the Upper Left Cover 1) Remove the copyboard glass. 2) Remove the two mounting screws [1], and detach the upper left cover [2]. [1] [2] Figure 7-306 4. Removing the Delivery Lower Cover 1) Open the copier top, and remove the copy tray. 2) Remove the two mounting screws [1], and detach the delivery lower cover [2]. [1] [2] Figure 7-307 5. Removing the Delivery Upper Cover 1) Open the copier top, and remove the inside cover.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS 6. Removing the Lower Inside Cover 1) Remove the front door and the transfer charging assembly. 2) Slide out the registration knob [1] to the front. 3) Remove the mounting screw [2]. 4) Loosen the two mounting screws [3], and remove the lower inside cover [4]. [2] [1] [4] [3] Figure 7-309 7–12 COPYRIGHT © 1998 CANON INC. CANON NP7160/NP7161 REV.0 AUG.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS B. Control Panel 1. Removing the Control Panel 1) Open the copyboard cover, and remove the two mounting screws [1]; then, detach the two ADF metal catches [2]. 2) Remove the inside cover. [2] [1] Figure 7-310 [4] 3) Remove the three mounting screws [3]. 4) Slide the control panel [4] to the front to remove; then, turn over the control panel. [3] Figure 7-311 5) Disconnect the three connectors [5], and remove the control panel.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS C. Copyboard Glass 1. Removing the Copyboard Glass 1) Remove the two mounting screws [1], and detach the glass retainer (right) [2]. [2] [1] Figure 7-313 2) Slide the copyboard glass [3] to the right. 3) Remove the two mounting screws [4], and detach the glass retainer (left) [5]. 4) Remove the copyboard glass [3]. [4] [3] [5] Caution: When mounting the NP7161’s copyboard glass, make sure that the blue marking on the side of the glass is to the front left.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS D. Fans 1. Removing the Scanner Cooling Fan 1) Remove the two mounting screws [1], and detach the filter [2]. [2] [1] Figure 7-315 2) Disconnect the connector [3], and remove the scanner cooling fan [4]. [3] [4] Figure 7-316 COPYRIGHT © 1998 CANON INC. CANON NP7160/NP7161 REV.0 AUG.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS 2. Removing the Exhaust Fan 1) Remove the developing assembly, drum unit, inside cover, and delivery upper cover. 2) Disconnect the two connectors [1]. [1] Figure 7-317 3) Remove the two mounting screws [2], and slide the exhaust fan assembly [3] to the front to remove. [2] [3] Figure 7-318 4) Disconnect the two connectors [4], and remove the two exhaust fans [5].
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS 3. Remove the Ozone Filter 1) Open the top unit. 2) Shift down the lever [1], and remove the ozone filter assembly [2]. [2] [1] Figure 7-320 3) Remove the ozone filter [3]. [3] Figure 7-321 COPYRIGHT © 1998 CANON INC. CANON NP7160/NP7161 REV.0 AUG.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS E. Counter Assembly 1. Removing the Counter Assembly 1) Remove the control panel. 2) Remove the two mounting screws [1], and remove the magnet [2]. 3) Disconnect the two connectors [3], and remove the two mounting screws [4]; then, detach the counter assembly [5]. Caution: When removing the magnet, mark its position and mount it with reference to the markings. [4] [2] [5] [1] [3] Figure 7-322 [1] [4] F. Main Motor Assembly 1.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS G. DC Controller PCB [1] 1. Removing the DC Controller PCB 1) Remove the delivery lower cover. 2) Disconnect all connectors of the DC controller PCB; then, free the harness from the harness guide. 3) Remove the six mounting screws [1], and remove the DC controller PCB [2] together with the base plate. [2] Caution: Take extra care not to damage the harness whenever you are removing the DC controller PCB.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS H. Removing the Power Supply PCB [4] 1. Removing the Power Supply PCB 1) Remove the rear cover. 2) Disconnect the fixing heater connector [1]. 3) Disconnect all connectors of the power supply PCB. 4) Free the AC harness [2] from the harness guide. 5) Remove the four mounting screws [3], and detach the power supply PCB [4]. [3] [1] [2] Figure 7-325 I. Removing the High-Voltage Power Supply PCB 1.
CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS J. Lamp Regulator PCB 1. Removing the Lamp Regulator PCB 1) Remove the rear cover. 2) Disconnect the two connectors [1] of the lamp regulator PCB. 3) Remove the three locking supports [2], and detach the lamp regulator PCB [3]. [1] [2] [3] Figure 7-327 COPYRIGHT © 1998 CANON INC. CANON NP7160/NP7161 REV.0 AUG.
CHAPTER 8 INSTALLATION This chapter introduces requirements for the site of installation, and shows how the copier may be installed using step-by-step instructions. I. SELECTING THE SITE ............................ 8-1 II. UNPACKING AND INSTALLATION ........ 8-2 A. Unpacking .......................................... 8-2 B. Removing the Metal Fixings ............... 8-3 C. Mounting the Drum Unit ..................... 8-4 D. Cleaning the Parts and Making Checks .. 8-6 E.
CHAPTER 8 INSTALLATION I. SELECTING THE SITE Check the site of installation against the following requirements. If possible, visit the site in advance of the delivery of the machine. 1. There must be a dedicated power outlet for exclusive use by the copier capable of providing the rated voltage (±10%). 2. The temperature must be 7.5° to 32.5°C (45.5° to 90.5°F), and humidity must be 5% to 85% RH. (Avoid areas near a water faucet, water boiler, humidifier, and refrigerator.) 3.
CHAPTER 8 INSTALLATION II. UNPACKING AND INSTALLATION When a piece of metal is brought in from a cold to warm place, droplets of water tend to form on its surface. This phenomenon is known as condensation, and copiers suffering from condensation can generate blank copies. If the copier has been brought in from a cold place, keep it unpacked for one hour or more before starting the installation work. The copier weighs about 42 kg/92.4 lb. Be sure to work in a group of two when lifting it. A.
CHAPTER 8 INSTALLATION B. Removing the Metal Fixings Step Work Checks/remarks 1 Remove the packing tape, cushioning Check to make sure that the covers are free of material, protective sheet of the scratches and dents. copyboard glass, and protective sheet of the size index. 2 Slide out the cassette, and remove the packing tape and the cushioning material from inside. 3 Slide the cassette into the copier. 4 Remove the two scanner fixing screws from the copier’s left side.
CHAPTER 8 INSTALLATION C. Mounting the Drum Unit Step 1 Work Checks/remarks Turn the toner supply lever counterclockwise to unlock the developing assembly. Toner supply lever 2 Remove the thumb screw, and remove the dummy drum. (You will be using the thumb screw when mounting the drum unit. Store away the dummy drum for possible relocation of the machine.) Thumb screw Dummy drum 3 Take out the drum unit from the box, and remove the cushioning material and the protective sheet.
CHAPTER 8 INSTALLATION Step Work 5 Fill out the label that came with the drum unit, and attach the label to the front cover of the drum unit. Checks/remarks date 6 date Datum counter compteur Zahler note notes Notiz Turn the toner supply lever clockwise to lock the developing assembly in place; then, close the copier top. COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 8 INSTALLATION D. Cleaning the Parts and Making Checks Step Work Checks/remarks 1 Clean the charging wire using the primary charging wire cleaning lever. 2 Clean the charging wire using the transfer charging wire leaning lever. 3 Take out the static eliminator, and clean it using the static eliminator cleaner stored behind the front door. Thereafter, set the static eliminator and the static eliminator cleaner back to their initial positions.
CHAPTER 8 INSTALLATION Step 5 Work Checks/remarks Take out the dust-proofing glass (1 screw), and dry wipe it with lint-free paper. Then, mount it back to the copier. Screw 6 Mount the inside cover. 7 Turn the toner supply lever counterclockwise to unlock the developing assembly. Toner supply lever 8 Remove the stopper (1 screw), and take out the developing assembly. Caution: • Do not touch the developing cylinder. • Take care not to damage the developing cylinder.
CHAPTER 8 INSTALLATION E. Checking the Images/Operations and User Mode Step Work Checks/remarks 1 Connect the power cord to the copier, and connect the power plug to the outlet. 2 Turn on the power switch. 3 Supply toner. 4 In standby state, execute service mode 401 (stir toner). • Check to make sure that the Paper indicator flashes. • Press the keys on the numeric keypad and the Clear key to make sure that copy counts are indicated correctly. See F. “Supplying Toner.
CHAPTER 8 INSTALLATION Step 6 Work While the toner is being stirred, perform the following: Checks/remarks To switch the cassette between AB and Inch, see the instructions under “Changing the Cassette Size (AB/Inch). (See p. 5-25.) 1) Set the cassette size to suit the needs of the user, and put copy paper inside the cassette. 2) Mount the copy tray to the copier. Copy tray 7 When drum unit installation mode has been executed, press the Reset key to end service mode.
CHAPTER 8 INSTALLATION F. Supplying Toner Step Work 1 Open the front door. 2 Turn the toner supply lever counterclockwise to unlock the developing assembly. Checks/remarks Tonner supply lever 3 Holding the grip, pull the developing assembly to the front until it stops. Handle 4 Holding the toner cartridge horizontal, shake it left and right several times. 5 Put the toner cartridge over the developing assembly, and push it in fully to the rear. 8–10 COPYRIGHT © 1998 CANON INC.
CHAPTER 8 INSTALLATION Step Work Checks/remarks 6 Push the toner cartridge from above to Check to make sure that the opening tab of the lock it to the developing assembly. toner cartridge has sprung to the front. 7 Pull the opening tab to the front until the STOP line is in view. 8 Tap lightly on the top of the toner cartridge so that the toner falls into the developing assembly. 9 Push in the grip of the developing assembly so that the toner cartridge may be detached.
CHAPTER 8 INSTALLATION III. RELOCATING THE MACHINE If you need to relocate the machine by truck or any other means of transportation, perform the following: Step Work Checks 1 Make a copy in Direct. 2 Take out all copy paper from the cassette. 3 Excute ‘403’ in service mode. The scanner, lens, and No.4/No.5 mirror unit move to the position for transportation. 4 Turn off the power switch, and disconnect the power plug from the power outlet.
CHAPTER 8 INSTALLATION IV. INSTALLING THE CONTROL CARD IV N 1) Remove the screw [1] from the right side of the upper rear cover, and detach the face cover [2]. 2) Cut off the face plate [3]. [3] [1] [2] Figure 8-401 3) Lead out the harness, and disconnect the shorting connector [4]; then, connect the connector [5] of the Control Card IV N to the copier’s connector [6].
CHAPTER 8 INSTALLATION V. INSTALLING THE REMOTE DIAGNOSTIC DEVICE II Keep the following in mind when installing the Remote Diagnostic Device II to the copier: 1. 2. 3. 4. 5. Be sure to observe the relevant laws and regulations of the country. Be sure to check that the copier has properly been installed before starting the work. Be sure to keep the copier’s power plug disconnected during the work. Be sure to identify the screws by type (length, diameter) and location.
CHAPTER 8 INSTALLATION [2] 1) Remove the two screws [1], and detach the top cover [2]. [1] [1] Figure 8-501 [4] 2) Connect the connector [3] of the power supply unit to the connector [4] as shown. [3] Figure 8-502 3) Remove the copier’s rear cover; then, remove the sheet [5], and cut off the face plate [6]. [5] [6] Figure 8-503 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 8 INSTALLATION 4) Lead the harness through the opening in the rear cover made by cutting off the face plate in step 3), and connect the connector [7] and the copier’s connector [8] (8P). (At this time, be sure to fit the harness in the harness guide as shown.
7) Shift bits 4 of the DIP switch (SW2) [12] on the device’s PCB to ON (so that the communication with the copier will be IPC communication). 1 2 3 4 5 6 7 8 CHAPTER 8 INSTALLATION [12] LED1 LED2 LED3 2 6 BAT1 1 1 1 SW3 SW2 LED5 LED6 LED4 SW4 2 IC6 CN4 SW1 CN3 CN2 8) If IC6 [13] is mounted on the PCB, shift bit 7 of the DIP switch (SW2) to ON; otherwise, keep bit 7 at OFF. Caution: 1.If the ROM (IC6) [13] is not mounted, you need not mount one newly. 2.
CHAPTER 8 INSTALLATION 10) Connect the power supply unit to the power plug, and check to make sure that LED1 [16] (green) turns on. [16] LED1 LED2 LED3 2 6 BAT1 1 SW2 LED5 LED6 LED4 1 1 SW3 SW4 2 IC6 CN4 SW1 CN3 CN2 11) Execute RAM clear. Set each bit of the DIP switch [17] (SW2) as indicated in Table 8-502, and press the push switch [18] (SW4). A press should turn on LED5 [19] (red).
12) After making sure that LED5 [19] (red) has turned on, set each bit of the DIP switch [17] (SW2) as indicated in Table 8-503, and press the push switch [18] (SW4). A press should turn off LED5 [19] (red), indicating that RAM clear has ended. 1 2 3 4 5 6 7 8 CHAPTER 8 INSTALLATION [17] [19] LED1 LED2 LED3 2 6 BAT1 1 1 1 SW3 SW2 LED5 LED6 LED4 SW4 [18] IC6 2 CN4 SW1 SW2 bits Settings SW2-1 OFF SW2-2 OFF SW2-3 ON SW2-4 ON SW2-5 OFF SW2-6 OFF SW2-7 See step 9).
CHAPTER 8 INSTALLATION 14) Connect the telephone line to the device. If the device is connected on its own, connect the modular jack cable to the connector LINE [21]. If the extension function of the device is used, connect the existing telephone or fax to the connector TEL [22], and connect the telephone line to the connector LINE [21].
CHAPTER 8 INSTALLATION 17) Check if the device is capable of ringing up the computer at the service station. Press the push switch [18] (SW4). A press will turn on LED6 [24] (red): it will turn off upon completion of transmission, and it will flash upon failure. Another press on the push switch (SW4) [18] while LED6 [24] is flashing will initiate transmission once again. A press on the push switch (SW1) [25] while LED 6 [24] is flashing will cancel transmission attempts.
CHAPTER 8 INSTALLATION 20) Attach the switch settings label [28] on the device, and record the settings of each switch. 21) Secure the top cover [29] in place with two screws [30]. At this time, check to make sure that the cable is fixed in place with the cable guide and is not trapped by the top cover [29]. [30] [28] [29] [30] Figure 8-519 8–22 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 8 INSTALLATION VI. INSTALLING THE ACCESSORY COUNTER 1) Open the front door; then, remove the inside cover, and cut off the face plate [1]. [1] Figure 8-601 [2] 2) Remove the delivery lower cover, and mount the accessory counter [2] to the counter assembly. Figure 8-602 [3] [4] 3) Connect the connector [3] of the accessory counter to the connector [4] of the counter assembly. Figure 8-603 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 8 INSTALLATION 4) Remove the delivery lower cover, and set the DIP switch (SW102) on the DC controller PCB as indicated in Table 8601. SW102-5 SW102-6 Settings OFF OFF Accessory counter not connected. ON OFF Uses the accessory counter as a small-size copy counter. OFF ON Uses the accessory counter as a large-size copy counter. ON ON Not used Table 8-601 5) Mount the delivery lower cover and the inside cover, and close the front door.
CHAPTER 8 INSTALLATION VII.INSTALLING THE ACCESSORY HEATER A. Installing the Heater Switch 1) Remove the rear cover, and cut off the face plate [1]. [1] Figure 8-701 [3] [2] 2) Mount the heater switch [2] with two screws [3]. Figure 8-702 [4] 3) Lead the heater switch harness through the clamp, and connect it to the connector [4]. Figure 8-703 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 8 INSTALLATION B. Mounting the Cassette/ Drum Heater 1) Remove the front door, drum unit, developing assembly, transfer charging assembly, and cassette. 2) Engage the two hooks [1] of the cassette/ drum heater on the cut-off, and slide to the rear to mount. [1] Figure 8-704 [2] 3) Secure with two mounting screws [2]. Figure 8-705 4) Lead the cassette/drum heater harness [3] through the harness guide, and connect the connector [4]. [3] [4] Figure 8-706 8–26 COPYRIGHT © 1998 CANON INC.
CHAPTER 8 INSTALLATION C. Installing the Mirror Heater [2] 1) Mount the inside cover and the delivery upper cover. 2) Mount the mirror heater [1] with two screws [2]. [1] Figure 8-707 3) Lead the mirror heater harness [3] through the harness guide, and connect the connector [4]. [3] [4] Figure 8-708 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 9 MAINTENANCE AND SERVICING This chapter provides tables of periodically replaced parts and consumables/durables and scheduled servicing charts. I. PERIODICALLY REPLACED PARTS ..... 9-1 A. Copier ................................................. 9-1 II. CONSUMABLES AND DURABLES ........ 9-2 A. Copier ................................................. 9-2 COPYRIGHT © 1998 CANON INC. III. SCHEDULED SERVICING CHART ........ 9-3 IV. SCHEDULED SERVICING TABLE ......... 9-5 A. Copier ..................
CHAPTER 9 MAINTENANCE AND SERVICING I. PERIODICALLY REPLACED PARTS Some of the parts of the copier need to be replaced on a periodical basis to ensure a specific level of performance (regardless of external appearance or presence/absence of damage). Plan replacement so that it coincides with a scheduled servicing visit. A. Copier As of August 1998 No. Parts name Parts No.
CHAPTER 9 MAINTENANCE AND SERVICING II. CONSUMABLES AND DURABLES Some of the parts of the copier may need to be replaced once or more because of wear or damage over the period of machine warranty. Replace them when they fail. A. Copier As of August 1998 No. 1 Parts name Scanning lamp Parts No.
CHAPTER 9 MAINTENANCE AND SERVICING III. SCHEDULED SERVICING CHART Note: 1. As a rule, provide scheduled servicing every 60,000 copies. 2. Before setting out for a visit, check the Servicing Book, and take parts for which replacement is expected. Step Work Checks 1 Report to the person in charge. Check the general condition. 2 Record the counter reading. Check the faulty copies. 3 Make test copies (in Direct, Reduce, Enlarge). a. density of images b. soiling of the background c.
CHAPTER 9 MAINTENANCE AND SERVICING Step Work 10 Clean the copyboard cover and the copyboard glass. 11 Make test copies. 12 Make sample copies. 13 Put the sample copies in order, and clean up the area around the machine. 14 Record the latest counter reading. 15 Fill out the Service Sheet, and report to the person in charge. 9–4 COPYRIGHT © 1998 CANON INC. Checks Remarks Use alcohol. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 9 MAINTENANCE AND SERVICING IV. SCHEDULED SERVICING TABLE A. Copier Caution: 1. Do not use solvents/oils other than those mentioned herein. 2. Keep the following in mind when cleaning/checking each charging assembly: • Do not use a cloth having metal powder. • Do not use a moist cloth. Dry wipe with lint-free paper, and use alcohol thereafter. Be sure that alcohol has dried completely before mounting back to the copier.
CHAPTER 9 MAINTENANCE AND SERVICING Intervals Unit Others Item every every every yearly 60,000 120,000 180,000 Remarks Transfer charging wire Static eliminator 9–6 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 10 TROUBLESHOOTING This chapter provides tables of maintenance/inspection, standards/adjustments, and identification of problems (image fault/malfunction). I. II. III. IV. V. VI. GUIDE TO TROUBLESHOOTING TABLES .................................................. 10-1 A. Image Adjustment Basic Procedure 10-3 B. Points to Note for Scheduled Servicing . 10-4 STANDARDS AND ADJUSTMENTS .... 10-5 A. Mechanical ....................................... 10-5 B. Exposure System ..........................
CHAPTER 10 TROUBLESHOOTING I. GUIDE TO TROUBLESHOOTING TABLES The troubleshooting tables in this chapter are based on more commonly used troubleshooting flow charts. Study the following for an idea of how you may take advantage of the tables. EX: AC power is absent. Cause Step Checks Yes/No Actions Power plug 1 Is the power plug connected to the power outlet? NO Connect the power plug. Covers 2 Are the front door and delivery cover closed properly? NO Close the door and the cover properly.
CHAPTER 10 TROUBLESHOOTING Step Checks Yes/No 1 Is the power plug connected to the power outlet? NO Actions Connect the power plug. YES 2 Is the front door closed properly? NO Close the door properly. YES 3 Is the rated voltage present at the power outlet? NO This is not the copier’s problem. Inform the user accordingly.
A. Image Adjustment Basic Procedure Non-AE, Copy Density at 5 Pre-Checks Density Slope Adjustment Solid Black Density Adjustment Optimum Exposure Adjustment Clean the charging wires. Is there a difference in density between front and rear? Is the density of gray scale No. 1 too low (light)? Is the density of gray scale No. 10 optimum? Check the height of the charging wire. NO YES YES NO YES NO Set the setting of ‘U12: density correction’ in user mode to a standard setting.
B. Points to Note for Scheduled Servicing Part Copyboard glass Lens Scanner rail Reflecting plate No. 1 to 3 mirrors Tool/solvent Alcohol Blower brush Lubricant Blower brush Blower brush; or, alcohol and lint-free paper Remarks Cleaning Cleaning Lubricate Cleaning Cleaning with a blower brush; if excessive, cleaning with alcohol Part Static eliminator Dust-proofing glass No.
CHAPTER 10 TROUBLESHOOTING II. STANDARDS AND ADJUSTMENTS A. Mechanical 1. Leading Edge Non-Image Width (blank exposure lamp off timing) Select No. 306 in service mode. Make adjustments so that non-image width on copies made of the Test Sheet in Direct is 2.0 ±1.0mm. [unit: 0.21 mm] [settings: 0 to 500] 2.0±1.0mm Figure 10-201 2. Image Leading Edge Margin (registration on timing) Select No. 305 in service mode.
CHAPTER 10 TROUBLESHOOTING 3. Left/Right Registration (cassette) Make adjustments by moving the horizontal registration adjusting screw of the cassette so that the distance between the copy image and the copy paper is 0 ±2.0 mm on copies made of the Test Sheet in Direct. Turn the adjusting screw [1] until the cassette locking lever plate [2] and the cassette locking lever [3] engage. When the adjusting screw [1] is turned clockwise, the cassette locking plate moves to the front.
CHAPTER 10 TROUBLESHOOTING B. Exposure System 1. Routing the Scanner Drive Cable Route the cable following steps [1] through [7], and perform the steps under “Adjusting the Tension of the Cable” and “Adjusting the Position of the Mirror.” [3] [4] Secure temporarily. [1] Steel ball Wind 11 times. [2] [6] [5] [2] [7] [6] Figure 10-205 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 10 TROUBLESHOOTING 2. Adjusting the Position of the Mirror Be sure to adjust the position of the mirror as follows after you have mounted the scanner drive cable. 1) Keep the mirror positioning tool nearby. Arrange the mirror positioning tool (FY9-3009-050) as shown to adapt it to the copier. Figure 10-206a (Rear) Figure 10-206b (Front) 2) Fit the mirror positioning tool [1] to the No. 1 mirror base and the No. 2 mirror base (both front and rear).
CHAPTER 10 TROUBLESHOOTING 3. Adjusting the Tension of the Scanner Drive Cable Be sure to adjust the tension as follows after routing the scanner drive cable. 1) Move the scanner to home position. 2) Pull the center of the scanner drive cable with a spring gauge about 10 mm. At this time, adjust the position [A] of the tension spring [1] so that the reading of the spring gauge is 95 ±15 g. Scanner 10mm 10mm Figure 10-208 [A] [1] [1] Figure 10-209 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.
CHAPTER 10 TROUBLESHOOTING C. Image Formation System 1. Outline As many as two charging wires are located around the photosensitive drum. (These charging wires are 0.06 mm in diameter.) 2. Stringing the Charging Wires Basically, all charging wires are strung in the same way. (The following uses the primary charging wire as an example.) 1) Remove the mounting screw [1], and remove the stopper [2] and the grid plate [3].
CHAPTER 10 TROUBLESHOOTING 3) Remove the spring [6], and remove the charging wire [7]. To remove the transfer charging assembly, remove the spring [e], and remove the charging wire [f]. • Primary Charging Assembly [7] • Transfer Charging Assembly [e] [6] [f] Figure 10-212b Figure10-212a 4) Free a length of about 5 cm of charging wire (0.06-mm dia.) from the reel, and form a loop at the end (2-mm dia.).
CHAPTER 10 TROUBLESHOOTING A Figure 10-214 8) Cut the excess charging wire with a nipper. 9) Pick the end of the charging wire tensioning spring with tweezers, and hook it on the charging electrode. Figure 10-215 Note: Go through the following: • Be sure that the charging wire is free of bending and twisting, and its gold plating has not peeled. • Be sure that the charging wire is in the V-groove of the charging wire positioner.
CHAPTER 10 TROUBLESHOOTING 3. Adjusting the Height of the Charging Wires To adjust each charging wire, turn its respective height adjusting screw. A full turn on the screw will change the height of the primary charging wire by about 0.5 mm and that of the transfer charging wire by about 0.7 mm. Charging assembly Primary Height of charging wire (mm) 11.0 0.2mm Transfer Range 1.0mm 1.0mm 9.5 0.
CHAPTER 10 TROUBLESHOOTING D. Pick-Up/Feeding System 1. Adjusting the Pressure of the Separation Pad If double feeding or pick-up failure occurs, loosen the adjusting screw [1] and relocate the holder [2] to adjust the force of the separation pad tension spring. • If pick-up occurs, move the holder in the direction of [A]. • If double feeding failure occurs, move the holder to in the direction of [B]. [2] [A] [B] [1] Figure 10-219 2. Changing the Cassette Size (AB/INCH) 1) Slide out the cassette.
CHAPTER 10 TROUBLESHOOTING 3) Remove the mounting screw [3]; then, slide the size switching lever [4] to the desired size position, and fix it in place. •AB [4] [3] [4] [3] •INCH Figure 10-221 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 10 TROUBLESHOOTING E. Fixing System 1. Adjusting the Height of the Fixing Assembly Inlet Guide 1) Loosen the two adjusting screws [1], and adjust the height of the fixing assembly inlet guides [2]. [1] [1] [2] Figure 10-222 2. Adjusting the Pressure of the Lower Roller (nip) If the nip is as indicated in Table 10-201, no adjustment is necessary. If the nip is not as indicated, change the position of the pressure spring [1]. [1] [1] Figure 10-223 10–16 COPYRIGHT © 1998 CANON INC.
CHAPTER 10 TROUBLESHOOTING Caution: a and c represent points 10 mm from both ends of copy paper. Feeding direction A3 size c b Center of copy paper a Figure 10-224 Dimensions Measurements* b 4.8 ± 0.3mm Ia-cI 0.5 mm or less *Be sure both upper and lower rollers are sufficiently warm before taking measurements. Table 10-201 a. Measuring the Nip Before measuring the nip, wait for 15 min after the end of warm-up and make 20 A4 copies: 1) Set A3 copy paper. 2) Open the copier cover.
CHAPTER 10 TROUBLESHOOTING F. Electrical System 1. Obtaining Optimum Exposure You can adjust the intensity of the scanning lamp (LA1) at F5 as follows (effective for both AE and manual): 1) Set the setting of ‘U12’ (density correction) in user mode to its initial value. 2) Place the Test Sheet (NA-3) on the copyboard, and select non-AE and Direct. 3) Select ‘216’ (density adjusting volume voltage display) in service mode.
CHAPTER 10 TROUBLESHOOTING 2. AE Adjustment If copies of a newspaper are foggy or if you have replaced the scanning lamp (LA1), AE sensor, or DC controller PCB, perform the following: (Be sure that the image is an optimum image before starting the work.) a. 1. 1) 2) 3) 4) AE Auto Adjustment AE Scanning Intensity Auto Adjustment Select ‘301’ (AE auto adjustment) in service mode. Place the Test Chart (white background original) on the copyboard glass.
CHAPTER 10 TROUBLESHOOTING b. AE Scanning Intensity Adjustment If an optimum image cannot be obtained by executing ‘301’ (AE auto adjustment) in service mode, perform the following: 1) Place a white background original on the copyboard glass, and select AE and Direct. 2) Make a copy, and check the copy image. 3) Select ‘302’ (AE scanning intensity adjustment) in service mode. • The copy count indicator will indicate the present setting. 4) Change the setting using the keypad or the +/- key.
CHAPTER 10 TROUBLESHOOTING c. AE Slope Adjustment If an optimum image cannot be obtained by executing ‘301’ (AE auto adjustment) in service mode, perform the following: 1) Place a newspaper on the copyboard glass, and select AE and Direct. 2) Make a copy, and check the copy image. 3) Select ‘303’ (AE slope adjustment) in service mode. • The copy counter will indicate the present setting. 4) Change the setting using the keypad or +/- key.
CHAPTER 10 TROUBLESHOOTING 3. After Replacing the DC Controller PCB 1) Set the DIP switch (SW102) on the new DC controller PCB so that its settings are the same as the old DC controller PCB. 2) Mount the new DC controller PCB. 3) Press the User Mode key, hold down ‘2’ and ‘8’ of the numeric keypad for 0.5 sec or more, and then press the User Mode key. • The copier starts service mode, and indicates ‘[1]’ on the control panel. 4) Press ‘4’ on the numeric keypad, and press the AE key.
CHAPTER 10 TROUBLESHOOTING 4. Checking the Photointerrupters The copier allows you to use its service mode when checking its photointerrupters. (You may also use a conventional meter.) a. 1) 2) 3) 4) Using a Meter Put the copier in standby state. Set the range of the meter to 30 VDC. Connect the - probe of the meter to J105-5 (GND) of the DC controller PCB. Connect the + probe of the meter to the appropriate terminal on the DC controller PCB indicated in the tables that follow.
CHAPTER 10 TROUBLESHOOTING Sensor Connector PS1 Scanner home position sensor J103-B2 PS2 Lens home position sensor J103-B5 PS3 Mirror home position sensor J103-B8 PS4 Cassette paper sensor J107-B12 PS5 Registration paper sensor J107-A2 PS6 Delivery paper sensor J124-2 PS7 Multi paper sensor J107-A8 PS8 Waste toner feeding screw locked sensor J106-10 PS9 Multi wide sensor 1 J107-A11 PS10 Multi wide sensor 2 J107-A14 PS11 Right door open sensor J107-B7 Waste toner sensor J106-9 220
CHAPTER 10 TROUBLESHOOTING III. IMAGE FAULTS A. Initial Checks 1. Checking the Site Environment a. The power outlet must be exclusive, and must provide the rated voltage. (The power plug must remain connected throughout day and night.) b. The copier must not be installed in a high-temperature/-humidity environment (near a water faucet, water boiler, humidifier), near a source of fire, or in a dusty area. c. The copier must not be subjected to ammonium gas. d.
CHAPTER 10 TROUBLESHOOTING 4. Checking the Charging Assembly a. Check each charging assembly for soiling and a fault on its charging wire (scratches). b. Clean the charging wire and shield plate of each charging assembly. (If dirt cannot be removed, replace it.) c. Check the height of each charging wire. d. Check to make sure that each charging wire is not rusted. f. Check to make sure that the anti-vibration rubber (of each charging assembly) is not displaced. 5. Checking the Developing Assembly a.
CHAPTER 10 TROUBLESHOOTING COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 10 TROUBLESHOOTING B. Image Fault Samples not available 10–28 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 10 TROUBLESHOOTING C. Troubleshooting Image Faults 1. The copy is too light. (halftone area only) Step Checks Yes/No 1 Perform the Image Adjustment Basic Procedure. Is the problem corrected? YES End. Scanner 2 Clean the mirror, lens, and dustproofing glass. Is the problem corrected? YES End. Developing assembly 3 Are the rollers of the developing assembly in firm contact with the drum during copying operation? NO Check the developing assembly locking lever.
CHAPTER 10 TROUBLESHOOTING 2. The copy is too light. (including solid black area) 3. The copy is too light. (entirely, considerably) Cause Step Checks Yes/No 1 Perform the Image Adjustment Basic Procedure. Is the problem corrected? YES End. 2 Turn off the power switch in the middle of copying operation. Then, open the front door, and open the top unit. Is the toner image on the photosensitive drum before transfer more or less normal? NO Go to step 7.
CHAPTER 10 TROUBLESHOOTING 4. The copy has uneven density. (front side dark) 5. The copy has uneven density. (front side light) Cause Step Checks Yes/No 1 Perform the Image Adjustment Basic Procedure. Is the problem corrected? YES End. Developing assembly 2 Are the developing rolls of the developing assembly in firm contact with the photosensitive drum? NO Check the developing assembly locking lever.
CHAPTER 10 TROUBLESHOOTING 6. The copy is foggy. (overall) Cause Step Checks Yes/No 1 Perform the Image Adjustment Basic Procedure. Is the problem corrected? YES End. Scanner 2 Clean the scanning lamp, reflecting plate, side reflecting plate, mirror, lens, and dust-proofing glass. Is the problem corrected? YES End. Pre-exposure lamp (LA2), DC controller PCB 3 Does the pre-exposure lamp remain on during copying? NO 1. Replace the pre-exposure lamp. 2. Replace the DC controller PCB.
CHAPTER 10 TROUBLESHOOTING 7. The copy is foggy. (vertical) 8. The copy has black lines. (vertical, fuzzy, thick) Cause Step Checks Yes/No Primary charging assembly 1 Clean the primary charging wire, grid plate, and shielding plate. Is the problem corrected? YES End. Scanner 2 Clean the scanning lamp, reflecting plate, side reflecting plate, mirror, lens, and dust-proofing glass. Is the problem corrected? YES End. Pre-exposure lamp (LA2) 3 Clean the pre-exposure lamp.
CHAPTER 10 TROUBLESHOOTING 10. The copy has white spots. (vertical) 11. The copy has white lines. (vertical) Step Checks Yes/No Fixing assembly 1 Press the Copy Start key with the copyboard cover open, and turn off the power switch while the copy paper is moving through the feeding assembly. At this time, does the copy image before it goes through the fixing assembly have white spots or lines? NO 1. Clean the fixing assembly inlet guide. 2. Check the upper fixing roller. 3.
CHAPTER 10 TROUBLESHOOTING 12. The copy has white spots. (vertical) Cause Step Checks Yes/No Actions Developing assembly 1 Is the problem noted at intervals of about 3.2 cm? (scratch on the developing cylinder) YES 1. Clean the developing roller. 2. Clean the surface of the developing cylinder. 3. If scratches are found on the surface of the developing cylinder, replace the developing cylinder or the developing assembly. Photosensitive drum 2 Is the problem noted at intervals of about 9.
CHAPTER 10 TROUBLESHOOTING 13. The back of the copy is soiled. Cause Developing assembly Step Checks Yes/No 1 Turn off the power switch while the copy paper is moving through the feeding assembly. At this time, is the back of the copy paper soiled? NO Go to step 3. 2 Is the problem noted at intervals of about 5 cm? YES 1. Clean the registration roller. 2. Clean the transfer guide. 3. Check the developing assembly for leakage of toner. NO 1. Clean the feeding assembly. 2.
CHAPTER 10 TROUBLESHOOTING 14. The copy has faulty fixing. Yes/No Actions Is the problem noted vertically? YES Check the fixing roller (upper, lower) for scratches. 2 Does the fixing heater (H1) turn on immediately after power-on? NO See the “Fixing heater fails to turn on.” 3 Is the nip of the fixing assembly as indicated? NO Adjust the fixing lower roller pressure. YES Try recommended paper. If the results are good, advise the user to use recommended paper.
CHAPTER 10 TROUBLESHOOTING 15. 16. The copy has a displaced leading edge. 17. Step Checks Yes/No Original page 1 Is the original page placed correctly? NO Place the original page correctly. Copy paper 2 Is the paper of a type recommended by Canon? NO Try recommended paper. If the results are good, advise the user to use recommended paper.
CHAPTER 10 TROUBLESHOOTING 18. The copy has a blurred image. Cause Step Checks Yes/No Actions Scanner cable 1 Does the cable wind on the cable pulley in layers while the scanner is moving? YES 1. Route the cable once again. 2. If the cable is twisted or frayed, replace it. Scanner rail 2 Move the No. 1 mirror mount slowly by hand. Does it move smoothly? NO Clean the surface of the scanner rail with alcohol. Then, apply a small amount of lubricant.
CHAPTER 10 TROUBLESHOOTING 20. The copy has poor sharpness. Step Checks Yes/No Copyboard glass 1 Is the copyboard glass soiled with oil or the like? YES Clean the copyboard glass. Mirror 2 Is the horizontal reproduction ratio in Direct as indicated? NO Adjust the distance between the No. 1 mirror and the No. 2 mirror. Scanner 3 Clean the scanning lamp, reflecting plate, mirror, lens, and dust-proofing glass. Is the problem corrected? YES End. Lens drive assembly, No. 4/No.
CHAPTER 10 TROUBLESHOOTING 21. The copy is blank. Cause Checks Step Yes/No Actions Drum unit 1 Is the drum unit set securely? NO Remove and set the drum unit once again. Developing assembly 2 Is the developing assembly set securely? NO Remove and set the developing assembly securely. Primary charging assembly 3 Is the primary charging wire broken? YES Spring the charging wire.
CHAPTER 10 TROUBLESHOOTING IV. TROUBLESHOOTING MALFUNCTIONS A. Copier 1. E000 Cause Step Checks Yes/No Actions 1 Execute service mode ‘412’ (error clear) to clear E000. Open the front door and the top unit, and let the fixing roller cool sufficiently. Turn off the power switch, and disconnect and then connect the power plug. Turn on the power switch. Does the fixing heater turn on? NO See “The Fixing heater fails to turn on.
CHAPTER 10 TROUBLESHOOTING 2. E001 Cause Step Checks Yes/No 1 Execute service mode ‘412’ (error clear) to clear E001. Open the front door and the top unit, and let the fixing roller cool sufficiently. Turn on the power switch. Is E001 indicated immediately after power-on? NO Go to step 3. 2 Turn off the power switch, and disconnect J108 and J109 on the DC controller PCB. Connect the probes to J108-2 and J108-3 and then J109-1 and J109-2 on the harness side.
CHAPTER 10 TROUBLESHOOTING 3. E002/E003 Step Checks Yes/No 1 Execute service mode ‘412’ (error clear) to clear E002 or E003. Open the front door and the top unit, and let the fixing roller cool sufficiently. Turn on the power switch. Does any of the following apply? • The fixing heater fails to turn on. • E000 YES See the appropriate section. Main thermistor 2 Turn off the power switch, and let the fixing roller cool sufficiently. Turn on the power switch, and select service mode ‘109’.
CHAPTER 10 TROUBLESHOOTING 4. E004 Cause Step Checks Yes/No Actions Fixing heater (H1) 1 Execute service mode ‘412’ (error clear) to clear E004. Turn on the power switch. Does the fixing heater turn on? NO See “The fixing heater fails to turn on.” Triac 2 Replace the power supply PCB. Is the problem corrected? YES End. NO Check the wiring from the power supply PCB to the DC controller PCB; if normal, replace the DC controller PCB. Yes/No Actions DC controller PCB 5.
CHAPTER 10 TROUBLESHOOTING 6. E013 Cause Step Waste toner feeding screw 1 Waste toner feeding screw locked sensor (PS8) 2 Yes/No Actions Is the flag of the waste toner feeding screw locked sensor rotating when the main motor is rotating? NO Remove the drum unit, and turn the feeding screw by hand. If it rotates easily, check how it is mounted. If it does not turn, replace the drum unit, and remove the cause.
CHAPTER 10 TROUBLESHOOTING 8. E031 Step Checks Yes/No Actions Accessory counter (CNT2) 1 Turn off the power switch, and disconnect J102 from the DC controller PCB. Set the meter range to 1 KΩ, and connect the probes to J102-A13 and J102-A12. Is the resistance about 500 Ω? NO Check the wiring from the DC controller PCB to the counter; if normal, replace the counter. Accessory counter (CNT2) 2 Connect J102 to the DC controller PCB, and turn on the power switch.
CHAPTER 10 TROUBLESHOOTING 10. E208 Cause Step Mirror home position sensor (PS3) Checks Yes/No Actions 1 Does the mirror move when the power switch is turned on? NO See “The mirror fails to move.” 2 Is the mirror home position sensor normal? (See the instructions on how to check the photointerrupters.) NO Check the wiring from the DC controller PCB to the sensor; if normal, replace the sensor. YES Replace the DC controller PCB. DC controller PCB 11.
CHAPTER 10 TROUBLESHOOTING 12. E220 Cause Step Lamp regulator PCB Checks Yes/No Actions 1 Does the scanning lamp (LA1) remain off? YES See “The scanning lamp fails to turn on.” 2 Set the meter range to 30 VDC, and connect the probes to J211-2 (+) and J211-1 (-) on the DC controller PCB. Is the voltage between the terminals when the scanning lamp turn on about 5 V? NO Check the wiring from the DC controller PCB to the lamp regulator PCB; if normal, replace the lamp regulator PCB.
CHAPTER 10 TROUBLESHOOTING 15. E712 Step Checks Yes/No Malfunction 1 Turn off and then on the power switch. Is the problem corrected? YES End. Connector 2 Is the connector (J754) used between the ADF and the copier connected securely? NO Connect the connector securely. ADF PCB 3 Replace the ADF controller PCB. Is the problem corrected? YES End. NO Replace the DC controller PCB. Cause DC controller PCB Actions 16.
CHAPTER 10 TROUBLESHOOTING 17. E800 Step Checks Yes/No Malfunction 1 Turn off and then on the power switch. Is the problem corrected? YES End. Power supply PCB 2 Replace the power supply PCB. Is the problem corrected? YES End. NO Check the wiring and continuity from the DC controller PCB to the control panel PCB; if normal, replace the DC controller PCB. Yes/No Actions Cause DC controller PCB Actions 18.
CHAPTER 10 TROUBLESHOOTING 20. AC power is absent. Cause Step Checks Yes/No Actions Power cord 1 Is the power cord connected to the copier? NO Connect the cord. Power plug 2 Is the power plug connected to the power outlet? NO Connect the power plug. Main power supply 3 Is the rated AC voltage present at the power outlet? NO This is not the copier’s problem. Inform the user accordingly. Front door 4 Is the front door closed securely? NO Close the front door.
CHAPTER 10 TROUBLESHOOTING 21. DC power supply is absent. Cause Step Yes/No Checks Actions AC power supply 1 Is the rated voltage present between J204-1 and J204-3 on the DC power supply PCB? NO See “AC power is absent.” Fuse (power supply PCB) 2 Is the fuse (FU1, FU2, FU3, FU4, FU5) on the power supply blown? YES Remove the cause, and replace the fuse. Turn off the power switch, and disconnect the power plug. Disconnect J208, J209, J210 on the power supply PCB.
CHAPTER 10 TROUBLESHOOTING 22. The scanner fails to move. Cause Step Checks Yes/No Actions Belt, Cable 1 Are the scanner drive belt and cable routed correctly? NO Route the belt and cable correctly, and check the pulley. Scanner path 2 Is the scanner rail free of soiling and object, and does the scanner move smoothly when pushed by hand? NO Remove any dirt and object; check for an object that may come into contact with the scanner. As necessary, clean and lubricate, or repair.
CHAPTER 10 TROUBLESHOOTING 23. The lens fails to move. Cause Step Checks Yes/No Actions Bolt 1 Is the lens drive belt routed correctly? NO Correct the belt, and check the gears. Lens path 2 Is the lens path free of dirt and foreign object? Does the lens move smoothly when pushed by hand? NO Remove any dirt and object; check for any object that may come into contact with the lens. As necessary, clean and lubricate, or repair. Lens motor (M3) 3 Replace the lens motor.
CHAPTER 10 TROUBLESHOOTING 25. The scanning lamp fails to turn on. Cause Step Checks Yes/No Actions Scanning lamp (LA1) 1 Is the scanning lamp mounted correctly? NO Disconnect the power plug from the power outlet, and mount the scanning lamp correctly. Thermal fuse (FU1) 2 Disconnect the power plug from the power outlet, and remove the thermal fuse.
CHAPTER 10 TROUBLESHOOTING 26. The pre-exposure lamp fails to turn on. Cause Step Pre-exposure lamp (LA2) 1 Checks Set the meter range to 30 VDC, and connect the probes to J104-A6 (+) and J104-7 (-) on the DC controller PCB. Does the voltage change from 0 to 24 V when the Start key is pressed? DC controller PCB Yes/No Actions YES Check the wiring from the DC controller PCB to the preexposure lamp; if normal, replace the pre-exposure lamp. NO Replace the DC controller PCB. 27.
CHAPTER 10 TROUBLESHOOTING 28. Pick-up fails. (cassette) Cause Step Checks Yes/No Actions Copy paper 1 Are the size of the copy paper in the cassette and the size indicated by the cassette size indicator identical? NO Set the cassette size indicator once again. Right door 2 Is the right door closed securely? NO Close the right door securely. 3 Is the leading edge of copy paper as far as the registration roller? YES See "The registration roller fails to rotate.
CHAPTER 10 TROUBLESHOOTING 29. Pick-up operation fails. (multifeeder) Cause Step Checks Yes/No 1 Is the leading edge of copy paper as far as the registration roller? YES See “The registration roller fails to rotate.” 2 Set the meter range to 30 VDC, and connect the probes to J107-B3 (+) and J107-B4 (-) on the DC controller PCB.
CHAPTER 10 TROUBLESHOOTING 31. The fixing heater fails to turn on. Cause Step Checks Yes/No Actions Thermal switch (TSW1) 1 Turn off the power switch, and remove the fixing assembly. Set the meter range to “Ωx1.” Does the meter index swing when the probes are connected across both terminals of the thermal switch? NO Replace the thermal switch. Fixing heater (H1) 2 Turn off the power switch, and remove the fixing assembly.
CHAPTER 10 TROUBLESHOOTING 33. The Add Toner indicator fails to turn off. Cause Step Checks Yes/No Actions 1 Open and close the front door. Does it turn off? YES End. Connector 2 Are the connector J15 of the toner sensor, relay connectors J721 and 720, and connector J102 on the DC controller PCB on the DC controller PCB connected securely? NO Connect the connectors securely. Toner sensor (TS1) 3 Replace the toner sensor. Is the problem corrected? YES End.
CHAPTER 10 TROUBLESHOOTING 35. The Waste Toner Box Full indicator fails to turn off. Cause Step Waste toner box Checks Yes/No Actions 1 Is the waste toner box mounted? NO Install the waste toner box. 2 Is the waste toner box full? YES Replace the waste toner box. Waste toner box 3 Is the mouth of the waste toner box soiled? YES Clean it. If the dirt cannot be removed, replace the waste toner box.
CHAPTER 10 TROUBLESHOOTING 37. The Add Paper indicator fails to turn off. Cause Step Checks Yes/No Actions Cassette 1 Is the cassette set correctly? NO Set the cassette correctly. Sensor (PS4, PS7) 2 Are the following sensors normal? (See the instructions on how to check the photointerrupers.) NO Check the wiring from the sensor lever and each sensor to the DC controller PCB; if normal, replace the sensor. YES Replace the DC controller.
CHAPTER 10 TROUBLESHOOTING 39. The Jam indicator fails to turn off. Cause Step Sensor Checks Yes/No Actions 1 Has all paper been removed from inside the copier? NO Remove the paper. 2 Execute service mode ‘101’ (jam type display) to find out which sensor detected the jam. Is there paper around the sensor? YES Remove the paper. 3 Is the sensor of step 2 normal? (See the instructions on how to check the photointerrupters.
CHAPTER 10 TROUBLESHOOTING 41. The Set Control Card indicator fails to turn off. Cause Step Checks Yes/No Actions Control card 1 Is the Control Card set correctly? YES Set the control card correctly. DC controller PCB 2 Can copies be made? YES Replace the DC controller PCB. NO Replace the Control Card IV N. Control Card IV N COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 10 TROUBLESHOOTING V. TROUBLESHOOTING FEEDING PROBLEMS A. Copy Jams The copier may be divided into the following in terms of where copy paper tends to jam. [1] Pick-up/feeding assembly [2] Fixing/delivery assembly The instructions on how to remove copy paper in the following tables are organized according to location. You may find out the location and the nature of each jam in service mode (‘107’). [2] [1] Figure 10-501 10–66 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 10 TROUBLESHOOTING 1. Pick-Up/Feeding Assembly Cause Step Checks Yes/No Actions 1 Does the jam occur when paper is picked up from the cassette? NO Go to step 8. 2 Is the cassette set in the copier correctly? NO Set the cassette correctly. 3 Try a different cassette. Is the problem corrected? YES Check the inside of the cassette for foreign matter. 4 Is the copy paper curled, wavy, or the like? YES Replace the copy paper.
CHAPTER 10 TROUBLESHOOTING 2. Fixing/Delivery Assembly Cause Step Fixing assembly Yes/No Actions 1 Is the separation claw worn, deformed, or soiled? YES 1. Replace the separation claw. 2. If dirt is found, clean it. Upper/lower fixing roller, Heat discharging roller 2 Is the upper/lower fixing roller or the heat discharging roller deformed or damaged? YES Replace the roller. Paper guide 3 Is the paper guide soiled with toner or the like? YES Clean the paper guide.
CHAPTER 10 TROUBLESHOOTING B. Faulty Feeding 1. Double Feeding Cause Step 1 Separation pad Checks Is the separation pad deformed, worn, or soiled? Spring 2 Separation roller Is the separation roller deformed, worn, or soiled? Spring Yes/No Actions YES Replace the separation pad. NO Push up the separation pad, and replace the spring. YES Replace the separation roller. NO Replace the spring used to pull the separation roller. Yes/No Actions 2.
CHAPTER 10 TROUBLESHOOTING VI. ARRANGEMENT AND FUNCTIONS OF ELECTRICAL PARTS A. Sensors and Switches PS11 PS7 PS9 PS10 PS4 PS5 PS6 TS1 PS3 PS2 PS1 PS8 DS1 SW1 Figure 10-601 10–70 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 10 TROUBLESHOOTING Name Symbol Description Notation Toner sensor TS1 Developing assembly toner level detection Photointerrupter PS1 PS2 PS3 PS4 PS5 PS6 PS7 PS8 PS9 PS10 PS11 Scanner home position detection Lens home position detection Mirror home position detection Cassette paper detection Registration paper detection Delivery detection Multifeeder paper detection Waste toner feeding screw locked detection Multifeeder paper width detection 1 Multifeeder paper width detection 2 Right door o
CHAPTER 10 TROUBLESHOOTING B. Motors, Fans, Clutches, and Solenoids CL3 CL2 SL2 SL1 M4 M3 M2 FM4 FM5 FM2 FM1 M1 CL1 Figure 10-602 10–72 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 10 TROUBLESHOOTING Name Symbol M CL SL Description Notation Motor M1 M2 M3 M4 Main drive Scanner drive Lens drive No. 4/No. 5 mirror drive Fan FM1 FM2 FM4 FM5 Cooling Heat discharge Heat discharge Heat discharge (accessory) Clutch CL1 CL2 CL3 Registration roller clutch Feeding clutch Multifeeder pick-up clutch Solenoid SL1 SL2 Pick-up solenoid Multifeeder pick-up solenoid Table 10-602 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 10 TROUBLESHOOTING C. Heaters, Lamps, and Others TH3 H2 TH1 RL1 TP1 VZ1 TH2 H1 LA3 FU1 LA2 LA1 CNT1 CNT2 H3 Figure 10-603 10–74 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 10 TROUBLESHOOTING Name Symbol Description Notation Heater H1 H2 H3 Fixing heater Cassette/drum heater (accessory) Mirror heater (accessory) Lamp LA1 Scanning lamp LED LED LA2 LA3 Pre-exposure lamp Blank exposure lamp CNT Counter CNT1 CNT2 Total copy counter Accessory counter Relay RL1 Fixing heater power supply control Thermal fuse FU1 Scanning lap overheating detection Thermal switch TSW1 Fixing assembly overheating detection Thermistor TH1 TH2 Fixing roller surface t
CHAPTER 10 TROUBLESHOOTING D. PCBs 4 6 5 3 2 7 9 1 8 Figure 10-604 Ref.
CHAPTER 10 TROUBLESHOOTING E. Variable Resistors, Light-Emitting Diodes, and Check Pins by PCB Of the variable resistors (VR), light-emitting diodes (LD), and check pins used in the copier, those needed for servicing work in the field are discussed. Caution: 1.Some LEDs retain current even when off and emit dim light. This is a normal condition and must be kept in mind. 2.VRs that may be used in the field ..................................................... 3.VRs that must not be used in the field ......
CHAPTER 10 TROUBLESHOOTING Item Remarks Use to change size. SW102-1 SW102-2 SW102-3 SW102-4 SW102-5 Use to set power supply voltage. SW102-8 SW102-1 SW102-2 INCH ON ON A OFF ON AB/INCH ON OFF AB OFF OFF ON :230V — OFF : 120V — Settings SW102-5 SW102-6 No accessory counter OFF OFF Small-size copy counter ON OFF Large-size copy counter OFF ON Not used ON ON Use to set the accessory counter.
CHAPTER 10 TROUBLESHOOTING AB/Inch-configuration (4R4E) 200% A4/LTR→A3, B5→B4 A4/LTR→B4 B4→A3, B5→A4/LTR 100% A3→B4, A4/LTR→B5 B4→A4/LTR A3→A4/LTR, B4→B5 50% Ratio 200.0% 141.4% 122.4% 115.4% 100.0% 86.5% 81.6% 70.7% 50.0% Table 10-608 AB-configuration (4R4E) 200% A4→A3, B5→B4 A4→B4 B4→A3, B5→A4 100% A3→B4, A4→B5 B4→A4 A3→A4, B4→B5 50% Ratio 200.0% 141.4% 122.4% 115.4% 100.0% 86.5% 81.6% 70.7% 50.0% Table 10-609 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 10 TROUBLESHOOTING 2. Power Supply PCB 4 1 J209 5 1 J208 J210 10 J211 7 1 1 J212 3 1 J204 1 4 J206 2 1 J203 Figure 10-606 3. Lamp Regulator PCB 5 J503 1 VR1 VR2 6 1 J501 Figure 10-607 10–80 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 10 TROUBLESHOOTING 4. High-Voltage Power Supply PCB 1 2 J304 1 2 J305 J301 10 1 VR82 VR52 VR83 VR81 3 J302 1 4 J303 1 VR141 VR52 1 3 J306 Figure 10-608 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
CHAPTER 10 TROUBLESHOOTING VII. SERVICE MODE A. Outline The copier’s service mode is divided into the following seven: No. [1] [2] [3] [4] [5] [6] [7] Description DISPLAY I/O DISPLAY ADJUST FUNCTION OPTION COUNTER APPLICATION Table 10-701 B. Using Service Mode 1. Starting Service Mode 1) Press the User Mode key. • If you are planning to make checks as in I/O display mode while making copies, select the appropriate copying mode before pressing the User Mode key.
CHAPTER 10 TROUBLESHOOTING C. Using Adjust Mode and Function Mode In adjust mode and function mode, the copier stores the settings made on the control panel in the RAM on the DC controller PCB and use them to simulate the functions of conventional variable resistors and switches. Figure 10-701 shows the information sheet stored behind the copier’s front door. Each copier is adjusted at the factory, and the adjustment values are recorded in the sheet.
CHAPTER 10 TROUBLESHOOTING D. Display Mode [1] • To select an item, use the keypad. • To execute an item, use the Start key. • To cancel an item, use the Clear key. No. Description Remarks 101 Indicates the type of jam. Indicates the type of jam. (See Table 10-702.) 106 E805 Indicates the code of the fan that caused E805. “01: exhaust fan at rear (FM2) “02: exhaust fan at fount (FM4) “03: sorter kit fan (FM5) 107 Indicates a history of jams. Indicates the most recent five jams.
CHAPTER 10 TROUBLESHOOTING No. Description Remarks 120 Indicates the release number of the ROM of the ADF. Indicates the release number of the program. 121 Indicates the type of jam in the sorter. Indicates the type of jam in the sorter. (See Table 10705.) 122 Indicates the tray warning for the sorter. Indicates the alarm code for the sorter. (See Table 10706.) 123 Indicates the stapling alarm for the sorter. Indicates the alarm code for the sorter. (See Table 10707.
CHAPTER 10 TROUBLESHOOTING Guide to ADF Jam History (No. 115) and ADF Jam Type (No. 117) • The type of jam is indicated using the following codes in the 10’s and 1’s places. In the case of the history, the number corresponding to the keys on the keypad will be indicated in the 100’s place.
CHAPTER 10 TROUBLESHOOTING Guide to Sorter Tray Warning (No. 122) Code 02 Description Overstacking Table 10-706 Guide to Sorter Stapling Warning (No. 123) Code 01 02 03 04 05 06 07 08 09 0A Description Stapler down Staple Stapler safety protection Edging fault Stapling overstacking Staple stacking limit Mixed paper sizes (breadthwise) Staple unit absent Paper in stapler Staple absent Table 10-707 Checking the Control Panel Keys (No. 126) 1) While the copier is in mode No.
CHAPTER 10 TROUBLESHOOTING E. I/O Display Mode [2] • To select an item, use the keypad. • To execute an item, use the Start key. • To cancel an item, use the Clear key. No. Description Remarks 201 Not used. 202 Indicates digit 4. Indicates the state of input. (See p. 10-89.) 203 Indicates digit 5. Indicates the state of input. (See p. 10-89.) 204 Indicates digit 6. Indicates the state of input. (See p. 10-89.) 205 Indicates digit 7. Indicates the state of input. (See p. 10-89.
CHAPTER 10 TROUBLESHOOTING Guide to Nos. 202, 203, 204, 205, 219, 220, 222, and 223 2a 1a 2b 1f 1b 1g 2c 2d 1e 1c 1d Figure 10-702 No. 201 202 LED Description Notation Signal Connector Remarks – – – 1a – – – – – 1b – – – – – 1c – – – – – 1d – – – – – 1e – – – – – – – 1f – – – 1g – – – – – 2a – – – – – 2b – – – – – 2c – – – – – 2d – – 1a Detects the presence/absence of the CNT1 TCNT_DR* J102-A10 ON: present. total copy counter. CSTPDT J107-B12 ON: present.
CHAPTER 10 TROUBLESHOOTING No. 203 204 205 219 LED Description – 1a – 1b 1c Detects the presence/absence of an accessories counter. 1d – 1e Detects the rotation of the scanner cooling fan (front). – 1f 1g Detects the rotation of the exhaust fan. 2a Detects the rotation of the exhaust fan.
CHAPTER 10 TROUBLESHOOTING No. 220 221 222 223 LED 1a 1b 1c 1d 1e 1f 1g 2a 2b 2c 2d 1a 1b 1c 1d 1e 1f 1g 2a 2b 2c 2d 1a 1b 1c 1d 1e 1f 1g 2a 2b 2c 2d 1a 1b 1c 1d 1e 1f 1g 2a 2b 2c 2d Description Notation Signal Connector Remarks PS1 SCHP J103-B2 OFF: at HP.
CHAPTER 10 TROUBLESHOOTING F. Adjust Mode [3] • • • • • To select an item, use the keypad. To execute an item, press the Start key. To change a setting, use the keypad or the +/- Zoom key. To enter a value, press the Start key. To remove an item, press the AE key. No. Settings Description 301 Executes AE auto adjustment. 302 Adjust the lamp intensity for AE mode. 303 — Remarks Use it to perform AE adjustment. (See p. 10-19.
CHAPTER 10 TROUBLESHOOTING No. Description Settings Remarks 326 Adjusts the activation voltage of the scanning lamp. 327 Adjusts the position of the lens (Direct at 100%). 0 – 200 A higher setting will enlarge the image. (unit:0.1 mm) 328 Adjusts mirror home position (at 100% ratio). 0 – 400 A higher setting will enlarge the image. (unit: 0.1 mm) 329 Selects a table for lens travel to suit reproduction ratio.
CHAPTER 10 TROUBLESHOOTING G. Function Mode [4] • • • • To select an item, use the keypad. To execute an item, use the Start key. To stop an item, use the Stop key. To clear an item, use the Clear key. Caution: Be sure that the copier is in standby state when executing any item. No. Description Remarks 401 Stirs toner. The developing assembly (main motor) will rotate 4 min. (The pre-exposure lamp LA2 and the blank exposure lamp LA3 will turn on, and all high-voltage outputs will turn off.
CHAPTER 10 TROUBLESHOOTING H. Option Mode [5] • • • • • To select an item, use the keypad. To execute an item, use the Start key. To change settings, use the keypad or the + and - Zoom keys. To store settings, use the Start key. To cancel an item, use the Clear key. No. Description Remarks 505 Sets U1 size. See Table 10-710. 506 Sets U2 size. See Table 10-710. 510 Sets drum cleaning.
CHAPTER 10 TROUBLESHOOTING No. Description Remarks Enables/disables retry for cassette pick-up operation. 0: In cassette pick-up mode, pick-up operation will be executed once again without indicating the first registration delay jam. 1: 518 Sets the count for the control card in multifeeder pick-up. 0: 1: Increment by 1 for all sizes (standard). Increment by 2 for all sizes. 519 Selects settings to suit the site of installation.
CHAPTER 10 TROUBLESHOOTING I. Counter Mode [6] • • • • To select an item, use the keypad. To execute an item, use the Start key. To cancel an item, use the Clear key. The result obtained by multiplying the indicated value by 100 will be the actual count. No. Description 601 Large copy counter 602 Small copy counter 603 Total copy counter 604 ADF large original page counter 605 ADF small original page counter 606 Count clear COPYRIGHT © 1998 CANON INC.
CHAPTER 10 TROUBLESHOOTING J. Application Mode [7] • • • • • To select an item, use the keypad. To execute an item, use the Start key. To change the value, use the keypad or the + and - Zoom keys. To store settings, use the Start key. To cancel an item, use the Clear key. No. 701 10–98 Description Adjusts the ADF original page stop position. COPYRIGHT © 1998 CANON INC. Settings 1–255 Remarks A lower setting will move the original page stop position in the direction of delivery. (unit: 0.
CHAPTER 10 TROUBLESHOOTING VIII. SELF DIAGNOSIS The microprocessor on the copier’s DC controller PCB is equipped with a function that checks the condition of the machine (especially the condition of sensors). It runs checks at such times as programmed, and will indicate any fault it finds in the form of code. A. Copier Cause Code Description E000 • The surface temperature of the fixing upper • The thermistor (TH1, TH2) has poor roller does not reach 40°C within 14 sec contact or an open circuit.
CHAPTER 10 TROUBLESHOOTING Cause Code Description E010 • The main motor (M1) is faulty. • The DC controller PCB is faulty. • The main motor lock detection signal (MM_LKDT*) is detected for 1 sec continuously while the main motor is being driven. E013 • The waste toner feedscrew is locked. • The waste toner feedscrew lock sensor (PS8) is faulty. • The DC controller PCB is faulty. • The waste toner feedscrew lock detection signal (TRQMLDT) does not switch for 0.
CHAPTER 10 TROUBLESHOOTING Cause Code Description E710 • The DC controller PCB is faulty. • IC114 (IPC) on the DC controller PCB cannot be initialized at power -on. E711 • The DC controller PCB is faulty. • An IPC communication error has been detected twice or more within 1 sec at power-on. E712 • The DC controller PCB is faulty. • The ADF controller PCB is fault. • The ADF cable is faulty. • A communication error with the ADF controller PCB cannot be cleared.
CHAPTER 10 TROUBLESHOOTING Note: 1. When the diagnostic function has turned on, the copier can be reset by turning it off once. This, however, does not apply to E000, E001, E002, E003, or E004. This is to prevent the user from resetting the copier easily when the error is caused by an open circuit in the thermistor, otherwise overheating and damaging the fixing roller. Normally, the copier will automatically turn off in about 4 sec if it is turned on without clearing E000 through E004.
CHAPTER 10 TROUBLESHOOTING B. ADF Code Cause Description E400 • Exchange of data with the copier has a fault. • The communication is monitored at all times. This error occurs when the communication with the copier stops. E401 • The separation motor does not rotate. • The crescent sensor is faulty. • See the ADF Service Manual. E402 • The belt motor does not rotate. • The belt clock is faulty. • See the ADF Service Manual. E403 • The feed motor does not rotate. • The feed motor clock is faulty.
CHAPTER 10 TROUBLESHOOTING C. Sorter Code E500 E510 E511 E513 E520 E530 E531 E540 E541 E550 Cause Description • Exchange of data with the copier is faulty. • Communication is monitored at all times. This error occurs when the communication with the copier stops. • The feed motor does not rotate. • See the Sorter Service Manual. • The feed motor rotates too slowly. • See the Sorter Service Manual. • The tandem path motor does not rotate. • See the Sorter Service Manual.
APPENDIX A. GENERAL TIMING CHART ................ A-1 B. SIGNALS AND ABBREVIATIONS ...... A-2 C. GENERAL CIRCUIT DIAGRAM .......... A-5 COPYRIGHT © 1998 CANON INC. D. SPECIAL TOOLS LIST ........................ A-7 E. SOLVENTS AND OILS ........................ A-8 CANON NP7161/NP7160 REV.0 AUG.
A. GENERAL TIMING CHART A4, 2 Copies, 100%, AE Sequence 1 Wait indicator 2 Fixing heater (H1) 3 Main motor (M1) 4 Primary charging assembly 5 Transfer charging assembly 6 Static eliminator Power switch ON 120°C 160°C WMUP WMUPR (flashing) Green Start key ON Leading edge of 1st page Power switch OFF Leading edge of 2nd page STBY STBY Target temperature control 0.6sec 0.4sec 0.1sec 0.6sec 0.4sec 0.1sec 7 Developing AC bias 0.
B. SIGNALS AND ABBREVIATIONS 1.
2. Abbreviations AER INTR AE ROTATION INITIAL ROTATION LSTR LAST ROTATION SCFW SCRV SCANNER FORWARD SCANNER REVERSE STBY STANDBY WMUP WARM-UP WMUPR WARM-UP ROTATION COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
APPENDIX A–4 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
C. GENERAL CIRCUIT DIAGRAM 5 1 2 3 1 2 3 WASTE TONER SENSOR J34 P S PS8 WASTE TONER FEEDING SCREW LOCKED SENSOR COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
APPENDIX A–6 COPYRIGHT © 1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG.
APPENDIX D. SPECIAL TOOLS LIST No. 1 Tool description Door switch Tool No. Shape Notation TKN-0093 Remarks A Point of use Front door 2 Mirror positioning tool COPYRIGHT © 1998 CANON INC. FY9-3009 B For adjusting the No. 1/No. 2 mirror position (front/rear as a pair) CANON NP7161/NP7160 REV.0 AUG.
APPENDIX E. SOLVENTS AND OILS No. 1 Description Ethyl alcohol (Etanol) Isopropyl alcohol (Isopropanol) Use Composition Description Cleaning: e.g., glass, plastic, rubber parts; external covers C2H5O Cleaning: e.g., metal; oil or toner CH3COC2H5 • Do not bring near fire. • Procure locally. Lithium soap (mineral oil family) • CK-0427 (500 g/can) 2 MEK 3 Heat-resisting Lubricating; e.g., fixing grease drive assemblies (CHZ3)2 CHOH • Do not bring near open fire. • Procure locally.
Prepared by OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DEPT. 1 OFFICE IMAGING PRODUCTS TECHNICAL SUPPORT DIV. CANON INC. Printed in Japan REVISION 0 (AUG.
This publication is printed on 70% reprocessed paper. PRINTED IN JAPAN (IMPRIME AU JAPON) 0998S0.