Service manual

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LQ - 300 + / LQ-305K

24 Pins Serial Impact Dot Matrix Printer

SEDM00006

SERVICE MANUAL

Summary of content (106 pages)

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OM .C CL UB .C SERVICE MANUAL 24 Pins Serial Impact Dot Matrix Printer :/ / BB S .
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OM .C .C CL UB Notice .F IX All rights reserved. No part of this manual may be reproduced, stored in a retrieval system, or transmitted in any form or by any means electronic, mechanical, photocopying, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION. All effort have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them.
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OM .C PRECAUTIONS Precautionary notations throughout the text are categorized relative to 1)Personal injury and 2) damage to equipment. Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing procedures preceded by DANGER Headings. WARNING Signals a precaution which, if ignored, could result in damage to equipment. CL UB .
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OM .C About This Manual .C This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of the printer. The instructions and procedures included herein are intended for the experienced repair technicians, and attention should be given to the precautions on the preceding page.
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OM .C Revision Status Issued Date Description A January 25, 2001 First Release B February 15, 2001 Revision: • page -34 Table 2-3 “CR Motor Specifications” misdescription corrected. • page -39 Table 2-10 “PF Motor Specifications” misdescription corrected. • page -42-“C395 MAIN Block Diagram” added. • page -43 Table 2-14 “Main ICs and Functions” misdescription corrected. • page -93-“Component Layout-C395MAIN (Mounted Side)” added. • page -94-“Component Layout-C395MAIN (Soldered Side)” added.
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Chapter 1 Product Description OM .C .C Contents 1.6 Initialization ...................................................................................... 22 1.8 Accessories ..................................................................................... 28 1.9 Difference between LQ-300+ and LQ-305K ................................... 29 Chapter 2 Operating Principles 2.1 Overview .......................................................................................... 31 2.2 Printer Mechanism ..
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Chapter 4 Disassembly and Assembly OM .C 5.1 Overview .......................................................................................... 72 5.1.1 Platen Gap Adjustment ............................................................. 72 5.1.2 Bi-D Adjustment ........................................................................ 73 .C 3.2 Troubleshooting .............................................................................. 46 3.2.1 Initialization Check .....................................
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OM .C .C CL UB .
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1.1 Features Copy capability: OM .C EPSON LQ-300+ Revision C 1 original + 3 copies Control panel functions: Font, Pause, Tear off, LF/FF, Load/ Eject, EPSON LQ-300+ is a 24-pin serial impact dot matrix printer.
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1.2 SPECIFICATIONS OM .C EPSON LQ-300+ Revision C With CSF (Single bin CSF) Dimensions: Mass: Without Pull Tractor Appearance: 366 x 275 x 159 mm (WxDxH) Mass: Approx. 4.4 kg Appearance: See the figure below. See the figure below. :/ / BB S .F IX CL UB Dimensions: Approx. 4.6 kg .C 1.2.1 Physical Specification 366 x 441 x 370 mm (WxDxH) Figure 1-3. Appearance With CSF Product Description TP Figure 1-2.
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Resolution: 1.2.2 Printing Specification Print method: Impact dot matrix Number of pins: 24 pins Print pin arrangement: 12 x 2 staggered High speed draft Print pin diameter: 0.29 mm (0.
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OM .C EPSON LQ-300+ Revision C International character sets: 14 countries and legal Character tables: U.S.A U.K. Italy Norway Latin America Standard version (13 character table) .C PC437 (US, Standard Europe) PC860 (Portuguese) PC865 (Nordic) BRASCII Roman 8 PC858 NLSP version (39 character tables) Typeface Bit map fonts: .
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Character tables and typefaces: Character table Bitmap font Scalable font Italic table PC 437 (US, Standard Europe) PC 850 (Multilingual) PC 860 (Portuguese) PC 863(CanadianFrench) PC 865 (Nordic) PC 861 (Icelandic) Abicomp BRASCII Roman 8 ISO Latin 1 PC 858 ISO 8859-15 EPSON Draft EPSON Roman EPSON Sans Serif EPSON Courier EPSON Prestige EPSON Script EPSON OCR-B EPSON Orator EPSON Orator-S EPSON Script C EPSON Roman EPSON Sans Serif EPSON Roman T EPSON Sans Serif H NLSP version Italic table PC 437
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OM .C EPSON LQ-300+ 1.2.3 Paper Feeding Friction feed (rear) Push tractor feed (rear) Push and Pull tractor feed (rear) Pull tractor feed (rear, bottom) Rear push tractor, CSF single-bin (Option) Pull tractor (Option) and Roll paper holder (Option) Paper path: Manual insertion CSF Push Tractor Pull Tractor Line spacing: 4.23mm (1/6 inch) or programmable in increments of 0.0706mm (1/360 inch) Rear in, top out Rear in, top out Rear in, top out Rear or bottom in, top out 53msec 0.092MPS (m/sec.
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OM .C EPSON LQ-300+ 1.2.4 Electrical Specification 1.2.5 Environmental Condition 120 V version Temperature: Rated voltage: AC 120V Input voltage range: AC 99 to 132 V Rated frequency range: 50 to 60 Hz Input frequency range: 49.5 to 60.5 Hz Rated current: 0.6A (max. 1.4A) Power consumption: approx. 20W (ISO/IEC 10561 Letter pattern) Insulation resistance: 10MΩ min. (between AC line and chassis, DC500V) Dielectric strength: AC 1000 Vrms. 1 min. or AC 1200 Vrms. 1 sec.
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OM .C EPSON LQ-300+ Type: Color: Ribbon life: approx. 0.5 million characters (Draft 10 cpi, 48 dots/character) Film Black approx. 0.2 million characters (LQ 10 cpi, 48 dots/character) .C Yellow 1.2.8 Safety Approvals Safety standards: UL1950 CSA C22.2 No. 950 EMI: FCC part15 subpart B class B CSA C108.8 class B CL UB 120 V version Safety standards: EN60950 (VDE) EMI: EN55022 (CISPR pub.22) class B AS/NZS 3548 class B 1.2.
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OM .C EPSON LQ-300+ 1.3 INTERFACE .C LQ-300+ provides bi-directional 8-bit parallel interface and serial interface. Optional interface board is not supported on this model. 1.3.1 Parallel Interface (Forward Channel) Transmission mode: 8 bit parallel Adaptable connector: 57-30360 (Amphenol) or equivalent -STROBE pulse Handshaking: BUSY and -ACKLG signals Signal level: TTL compatible (IEEE-1284 level 1 device) Figure 1-4. Data Transmitting Timing Minimum Maximum Condition VOH* -- 5.
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BUSY signal is active (HIGH level) under the conditions below: OM .C EPSON LQ-300+ Revision C Table 1-1. Connector Pin Assignment and Signals In the process of receiving data Pin No. Return GND Pin In/Out 26 In bit6 bit7:MSB In the condition of being -INT signal active (low level) 8 DATA7 During hardware initialization 9 DATA8 27 In 10 .
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OM .C EPSON LQ-300+ 1.3.2 Parallel Interface (Reverse Channel) IEEE-1284 nibble mode Adaptable connector: See 1.3.1 "Parallel Interface (Forward Channel)" Synchronization: Refer to the IEEE-1284 specification Handshaking: Refer to the IEEE-1284 specification 2 Signal level: IEEE-1284 level 1 device See 1.3.1 "Parallel Interface (Forward Channel)" 3 Pin No.
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Return GND Pin In/Out 17 Chassis -- -- 16, 33, 19-30 GND -- -- 15, 34 NC -- -- Pin No. Functional Description Chassis GND. Signal GND. 2 TXD 20 DTR 11 Not connected. 4 NOTE: In/Out shows the direction of signal flow from the printer’s point of view. 1.3.
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Auto: The printer has 2 interfaces; the parallel interface and serial interface. These interfaces are selected manually by Default Setting or selected automatically. Manual Selection Communication is carried out in the conventional mode until a magic string (1284.4 synchronous commands) is received. By receiving a magic string, communication in IEEE1284.4 packet mode is started. Off: One of 2 interfaces can be selected by Default setting. Revision C .C 1.3.4 Interface Selection OM .
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1.4 OPERATOR CONTROLS 1.4.1.1 Switches OM .C EPSON LQ-300+ Revision C Operation in normal mode In normal mode, pressing panel switches executes the following functions. 4 switches and 5 LEDs are on the panel as shown below. Tear Off LF/FF Load/Eject Paper Out Pause Script Others Draft Draft Condensed Roman Font Micro Adjust 3 sec Sans serif Courier : LED On : LED Blinks Load/Eject -Loads or ejects paper. -Execute micro feed forward, when this function is enabled.
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OM .C EPSON LQ-300+ Operation in default setting mode -All LEDs blink when continuous paper is in the Tear-off position. : Tear off : Draft : Draft Condensed : Roman : Sans serif : Courier : Prestige : Script : Others ( : LED On, : LED Off, : LED Blinks) Tear Off Selects the Menu. LF/FF Change the setting Others Not available. CL UB Function .C The following switches are used in default setting mode as follows; Switch 1.4.1.2 LED Indication in normal mode 1.4.1.
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1.4.2 Panel Functions Default setting 1.4.2.1 Usual Operation Data Dump Starts the data dump mode, in which all the input data are printed as hexadecimal numbers and corresponding characters. -Pressing it loads out sheet or continuous paper when the printer is out of paper. -Pressing it ejects out sheet to the stacker or continuous paper to the paper park. .C Load/Eject Clear EEPROM Resets the printer to the factory default setting, which is not always proper for each market demand. (i.e.
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6. When the LF/FF button is pressed, the printer memorizes the last setting value. 7. Repeat (4) to (6). The other items can be changed in the same manner. The menu selection will return to the first menu after the last menu selection is over. 8. Turn the printer off. The setting is stored into non-volatile memory. Setting / Value *2 Page length for tractor 3 inch, 3.5 inch, 4 inch, 5.5 inch, 6 inch, 7 inch, 8 inch, 8.
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1.4.2.4 Bi-d. Adjustment 1.4.3 Errors Bi-d. adjustment can be performed by users. Bi-d. adjustment method is as follows. Paper out error: 2. Select the most closely aligned number by pressing the LF/FF (↓) and Load/Eject (↑) switches. Font LEDs and Pause LED show the pattern number which is selected at that time. The selection is advanced one by one as the switch is pressed, and the combination of On/Off/Blink of those three LEDs is also changed according to the selection. 3.
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OM .C EPSON LQ-300+ 1.5 Control codes Control codes = ESC/P2 .C 1.6 Initialization to initialize the printer mechanism. to execute Operator initialization. Operator initialization to clear the all buffers of data. to cancel the download character definition. to make the printer stand-by state, if no errors occur. to execute Software initialization. Software initialization .F IX The initialization of this level is activated by -INT signal (negative pulse).
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OM .C EPSON LQ-300+ 1.7 PAPER Cut sheet (multi part) Table 1-3. Cut Sheet (Multi Part) Cut sheet (single sheet, not multi part) Width Table 1-2. Cut Sheet (Single) Maximum Minimum Maximum Width (inch) (mm) (3.9) 100 (10.1) 257 (7.2) 182 (8.5) 216 Length (inch) (mm) (3.9) 100 (14.3) 364 (10.1) 257 (14.0) 356 (inch) (mm) (0.0025) 0.065 (0.0055) 0.14 (0.0028) 0.07 (0.0055) 0.14 Weight (lb.
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OM .C EPSON LQ-300+ Continuous paper (Single sheet and Multipart) Table 1-4. Envelope Minimum Length (inch) (mm) (3.6) 92 Width Width (inch) (mm) (9.5) 241 Length (one page) Length (inch) (mm) (4.1) 105 (inch) (mm) (g/m2) (lb.) Quality The difference of thickness at the printable area is within 0.25mm (0.0098 inch). 45 (12) 90 (24) BOND paper, PLAIN paper or AIR MAIL No glue at a flap Not curled, not folded, not crumpled Min. Max. (inch) (mm) (4) 101.6 (10) 254 (4) 101.
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Labels Revision C 63.5 mm (2.5 inch) min. Table 1-6. Continuous Paper with Labels Label size Max. --- Min. See the figure below. --- (4) 101.6 (10) 254 --- --- (4) 101.6 (22) 558.8 (inch) (mm) --- --- (0.0028) 0.07 (0.0035) 0.09 (inch) (mm) --- --- (0.0063) 0.16 (0.0075) 0.19 (inch) (mm) Base sheet length (one page) (inch) (mm) Base sheet thickness Total thickness (g/m2) (lb.) Quality --- 64 (17) --- --- Label R 2.5 mm (0.1 inch) min. Figure 1-6.
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OM .C EPSON LQ-300+ 1.7.2 Printable Area Revision C Table 1-8. Printable Area for Cut Sheets Cut sheets Single Sheet PL (Length) Refer to 1.7.1 "PAPER SPECIFICATIONS" .C PW (Width) Refer to 1.7.1 "PAPER SPECIFICATIONS" Refer to 1.7.1 "PAPER SPECIFICATIONS" Refer to 1.7.
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OM .C EPSON LQ-300+ Revision C Continuous paper Envelop R M L M Figure 1-8. Printable Area for Envelop Table 1-9. Printable Area for Envelope Envelope Printable Area Refer to 1.7.1 "PAPER SPECIFICATIONS" PL (Length) Refer to 1.7.1 "PAPER SPECIFICATIONS" LM (Left Margin) 3 mm or more RM (Right Margin) 3 mm or more TM (Top Margin) 4.2 mm or more BM (Bottom Margin) 4.2 mm or more BB S PW (Width) TP :/ / NOTE: The maximum horizontal printable area is 203.2mm. Product Description .
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OM .C EPSON LQ-300+ Revision C 1.8 Accessories Roll paper P W Enclosed Items B M User's manual T M Driver disk .C L M 1 CL UB Power supply cable (230 V Version) Table 1-11. Printable Area-Roll Paper Description Fabric ribbon cartridge (Black) #7753 Fabric ribbon pack (Black) #7755 Film ribbon cartridge (Black) #7768 .F IX BB S Figure 1-10.
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OM .C EPSON LQ-300+ 1.9 Difference between LQ-300+ and LQ-305K .C The LQ-300+ and the LQ-305K are only differnet in the following points, and all other components are remained the same. Revision C EEPROM setting Model ID setting is different. CL UB New function: “Condensed Print Mode” is added Selectable from the control panel (Enable/Disable) “Condensed Print Mode” select command support Product Description TP :/ / BB S .
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OM .C .C CL UB .
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OM .C EPSON LQ-300+ 2.1 Overview Printer Mechanism Main Board C395MAIN C294PSB/PSE Panel Board C294PNL Circuit board .F IX Figure 2-1. Component Unit Main (control circuit): C395MAIN Board Power: C294PSB / C294PSE Board Panel: C294PNL Board Operating Principles TP :/ / BB S The following sections describe the operating principles of each unit. CL UB Power Supply Board .C LQ-300+ consists of the printer mechanism and electric circuit boards.
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OM .C EPSON LQ-300+ 2.2 Printer Mechanism Ribbon mechanism The following is main components of the LQ-300+ printer mechanism. Platen gap adjustment mechanism Revision C Color ribbon drive mechanism (option) Adjust lever, Platen gap detector Printhead .
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OM .C EPSON LQ-300+ 2.2.1 Printhead 1.08 The table below shows the printhead specifications. Table 2-1. Printhead Specifications #1 Number of wires 24 Diameter of wire φ0.20 mm See the figure below. Note: The figure is seen from the back of the head facing printing side. Direct current coil resistance 54.7 ± 3.9Ω (at 25°C) Number of coils 24 Head drive method Rated voltage drive Head drive voltage 35V ± 3.5V • Normal Mode: 0.65A (38.5V x 270µs at 5°C) • Copy Mode: 0.67A (38.
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OM .C EPSON LQ-300+ 2.2.2 Carriage Mechanism Mounts the printhead. CR motor: Drives carriage to the printing column direction. Timing belt: Transfers the drive from the CR motor to the carriage. Carriage guide shaft: HP detector: Shifts the carriage parallel to the platen. Detects carriage home position. CR MOTOR Table 2-3. CR Motor Specifications Item Specification 2-phase/200-pole hybrid stepping motor Coil resistance 4.
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The following table shows the various carriage speed modes. Table 2-4. Carriage Speed Mode B 3375 C D 2700 2250 Front rush High speed Normal speed Color 2-2 0.79 0.79 BW 2-2 0.70 0.59 Color 2-2 0.79 BW 2-2 Color BW Low speed Rear rush 0.70 0.70 0.70 0.59 0.59 0.59 0.79 0.70 0.70 0.70 0.59 0.59 0.59 2-2 0.79 0.79 0.70 0.70 2-2 0.70 0.59 0.59 0.59 Color 2-2 0.79 0.79 0.70 0.70 BW 2-2 0.70 0.59 0.59 0.59 Color 2-2 0.79 0.79 0.70 BW 1-2 0.
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OM .C EPSON LQ-300+ CARRIAGE HOME POSITION (HP) DETECTOR 2.2.3 Ribbon Mechanism The table below is the HP detector specifications. 2.2.3.1 Ink Ribbon Shifting Mechanism Ink ribbon shifting mechanism: CR motor drives timing belt and the timing belt driven pulley drives the ribbon shifting gears. Specification Mechanical contact method Switching rate 0.6 to 1.0 mA, 5 VD±5% • out of HP: close • within HP: open 2.2.3.
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OM .C EPSON LQ-300+ Revision C RIBBON CARTRIDGE DETECTOR Color ribbon drive circuit Ribbon detector detects if the color ribbon is installed or not. .C Detect Timing When the power is applied. Ribbon detector When recovering from the economy mode. CL UB When the printing is started. Table 2-7. Ribbon Detector Specifications Item CS cam CS lever assembly Black Cyan Magenta Yellow Mechanical contact method Switching rate 0.6 to 1.
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OM .C EPSON LQ-300+ COLOR MECHANISM INITIALIZATION PLATEN GAP (PG_SW) DETECTOR The printer mechanism initializes when the power is applied or when recovering from the energy saving mode. The following is PG_SW specification. Table 2-9. PG_SW Detector Specifications This mechanism is to adjust the distance between the platen and the printhead (platen gap) according to the paper thickness. Carriage: Mounts the printhead. Carriage guide shaft: Shifts the carriage horizontally.
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2.2.5 Paper Feed Mechanism PF MOTOR Paper Feed Method The table below is the PF motor specifications. Friction feed Table 2-10. PF Motor Specifications Push tractor feed Item CL UB Uses standard push tractor Motor type Push-pull tractor feed Uses standard push tractor + Option tractor Pull tractor feed Replace the standard push tractor with option tractor Feeder .
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OM .C EPSON LQ-300+ Revision C 2.2.5.1 Page Length Measurement RPE DETECTOR RPE detector is installed on the paper path at the back of the printer. The table below shows the RPE detector specifications. Value = [The number of paper feed pulse from the paper top (top margin: 4.2mm) until RPE detector detects paper end] + [forms over-ride specified paper feed pulse] [adjustment value] Specification Mechanical contact method Switching rate 0.6 to 1.
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2.2.6 Release Mechanism OM .C EPSON LQ-300+ Revision C The table below shows the release detector specifications. Table 2-13. Release Detector Specifications This mechanism switches the flow of PF motor driving forth between to the friction feed and to the tractor feed. Item Tractor gear Switching rate Release lever Paper advance reduction gear Switching mode Release detector Specification Mechanical contact method 0.6 to 1.0 mA, 5 VD±5% • Friction: open • Tractor: close 2.2.
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OM .C EPSON LQ-300+ 2.3 Electric Circuit Operating Principles :/ / BB S .F IX CL UB .C 2.3.1 C395MAIN Board Revision C Operating Principles TP Figure 2-7.
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OM .C EPSON LQ-300+ Revision C Table 2-14. Main ICs and Functions Table 2-14.
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OM .C .C CL UB .
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OM .C EPSON LQ-300+ 3.1 Overview Troubleshooting Never touch printhead and any motors right after printing since they are highly heated. When disassembling the printer, be sure to disconnect the power cable and remove the interface cable. Be sure to use specified tools for servicing to maintain the quality. Initialization Check Check performance by selfcheck function. Does any trouble occur? Identify problems from symptoms. Perform maintenance. Figure 3-1.
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3.2 Troubleshooting Printer Condition Before troubleshooting, check the following basic items. Tear Off When the printer cannot perform any printing, check the setting by “Default Setting”. (Refer to Chapter 1.) Font Select CL UB 3. When a printer can perform printing, perform self-test and check if any troubles occur. Fatal Error Check if the outside and inside the printer is noticeably dirty or if any parts are broken. If there is dirt, perform cleaning referring to Chapter 6 “Maintenance”. 4.
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3.2.3 Identify Problems From Symptoms Self-test print is abnormal. Paper feed is abnormal. Control panel and switches do not operate properly. Table 3- 4 on page 47 Table 3- 5 on page 48 Table 3- 6 on page 48 Table 3- 7 on page 48 • Self-test is normal, but the printing from host computer is abnormal. TP Troubleshooting Y/N Is a fuse on the power board blew out? YES Check the electric circuit and printer mechanism. If there is no short circuit, replace the fuse. NO Replace the power board.
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CR motor is defective. HP detector harness is not connected properly HP detector is defective. NO Is HP detector harness CN3 connected properly? NO - Power board is defective. Is power voltage normal? - Connect it properly. Ribbon mechanism is defective. Replace the CR motor. Printer mechanism is defective. RPE detector or BPE detector is defective or not connected properly. Replace the power board. Replace the main board and printer mechanism.
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OM .C EPSON LQ-300+ Cause Check Point Y/N Solution Check the initial setting with the default setting. Is it OK? NO Reset the setting or use the EEPROM clear to reset setting to the default. Interface cable is not connected properly. Are cables connected properly? NO Connect them properly. Interface cable is defective. - - Replace the interface cable. Main board is defective. - - Replace the main board.
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OM .C EPSON LQ-300+ 3.2.4.1 Printhead Check By measuring the direct current resistance of the printhead coil, you can check if it is all right. Specification 33.3 ± 3.3Ω (at 25°C/phase) CL UB Printhead Operation 1. Set the multimeter to the resistance measuring range. 2. Connect the one side of the probe to C. 3. Connect the other side of the probe to corresponding head pin No. .F IX Item .C Table 3-10.
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OM .C EPSON LQ-300+ Revision C 3.2.4.2 Motor Check 3.2.4.3 Sensor Check By measuring the direct current resistance of the motor coil, you can check if the motor is all right. When the sensor is connected mechanically, you can check the sensor by its conductivity. CR motor PF motor Specification Item 5.7Ω ±10% (at 25°C/phase) HP detector 16.0Ω ±10% (at 25°C/phase) 150Ω ± 5% (at 25°C/phase) RPE detector .F IX CS motor (option) Operation Set the multimeter to the resistance measuring range.
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OM .C EPSON LQ-300+ 3.2.4.4 Printhead Driver Check Simple check of the printer driver (Q3 ~ Q11) can be done by the following method. Table 3-13. Printhead Driver Check The resistance should NOT be “0” or infinity. Troubleshooting TP :/ / BB S .F IX (Q3 ～ Q11) Specification .C Printer driver Operation 1. Set the multimeter to the resistance measuring range. 2. Connect the one side of the probe to the base of the transistor. 3. Connect the one side of the probe to emitter of the transistor.
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OM .C .C CL UB .
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OM .C EPSON LQ-300+ Revision C 4.1 Overview 4.1.2 Tools This chapter explains the disassembly and assembly of LQ-300+. The table below lists the tools recommended to use for disassembly and assembly and adjustment. Use only tools specified here. Tools Never touch the printer right after it finishes printing, for the C A U T IO N Needle-nose pliers B740400100 Nipper B740500100 Tweezers B741000100 Soldering bit B740200100 E ring holder #2.5 B740800400 + driver No.
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4.1.3 Service Checks After Repair Category Before returning the printer back to the user, use the check list below to confirm the quality of the repaired printer.
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OM .C EPSON LQ-300+ 4.2 Disassembly and Assembly The figure below is the disassembly flowchart for main component. This section explains the disassembly and assembly of Product Name. Unless otherwise specified, assembly can be done in the reverse order of the disassembly procedure. .C START Anything that service person should pay attention to is described under “Check Point”. Any adjustment required after assembly is described under “Adjustment”. 4.2.1 "Printhead Removal" 4.2.
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4.2.1 Printhead Removal CBP (3x14) Remove the cover and the printer. 2. Remove 1 screw (CBP, 3x14, Torque:0.59-0.78N.M) securing the printhead to the carriage assembly. Lift the printhead a little bit. Unlatch 2 hooks securing the printhead FFC to carriage unit. When the printhead is replaced, perform the platen gap adjustment. Figure 4-1. Printhead Removal Disassembly and Assembly TP :/ / BB S A D J U S T M E N T R E Q U IR E D Check if the printer is powered off before removing the printhead.
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4.2.2 Upper Housing Removal 1. Remove platen knob, cover assembly, printer, tractor unit and paper eject unit. Remove the color upgrade kit if it is installed. 2. Set the release lever to the tractor feed. 3. Remove 4 screws (CBP, 3x10, Torque: 0.78-0.98N.M) securing the upper housing to the lower housing. 4. Remove the upper housing. Revision C When installing the upper housing, be sure to insert LEDs on the panel board to the LED holes of the upper housing. .
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OM .C EPSON LQ-300+ 4.2.3 Printer Mechanism Removal Remove the upper housing. (See 4.2.2 "Upper Housing Removal".) 2. Remove 3 screws (CBP, 3x10,Torque: 0.78-0.98N.M) and (CBS, 3x4, Torque: 0.78-0.98N.M) securing the upper shield plate to the lower housing. Remove the shield cover. CBP (3x10) Upper Shield Plate CBB (3x14) with washer CL UB CBB (3x14) with washer Printer Mechanism Figure 4-3. Upper Shield Plate 5.
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OM .C EPSON LQ-300+ Revision C 4.2.5 C395 MAIN Board Assembly Removal 1. Remove the upper housing. (See 4.2.2 "Upper Housing Removal".) 1. Remove the upper housing. (See 4.2.2 "Upper Housing Removal".) 2. Remove the panel FFC from the connector of panel board assembly. 2. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) 3. Remove 3 screws (CBP, 3x10, Torque: 0.78-0.98N.M) securing the panel board assembly to the lower housing. 3.
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OM .C EPSON LQ-300+ ROM CN13 CN12 1. Remove the upper housing. (See 4.2.2 "Upper Housing Removal".) 2. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) 3. Remove the power cable (CN1) connecting to the Power Supply board assembly. 4. Remove the power switch from the lower housing. 5. Remove the harness connecting the Power Supply board assembly to the main board assembly. (CN8 of the main board assembly) 6. Remove 4 screws (CBP, 3x10, Torque: 0.78-0.98N.
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OM .C EPSON LQ-300+ Revision C 4.2.7.1 CR Motor Assembly Removal This section explains the disassembling procedure of the printer mechanism. The disassembling procedure is shown in the flowchart below. 1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) 2. Remove the tension spring, 8.10 and motor bracket and release the tension of the timing belt. 3. Remove the timing belt from the pulley of the CR motor assembly. 4.
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OM .C EPSON LQ-300+ 4.2.7.2 Platen Removal Revision C Bushing, 11 Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) 2. Remove the platen grounding wire from the platen. 3. Release 1 hook at the rotating hole of the combination gear 17.5, 27 and remove the gear from the right frame. Platen To unhook the combination gear 17.5, 27, hold it and pull it to the arrow direction. .F IX Combination gear, 17.5, 27 CL UB Left frame Gear, 34 .C 1.
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OM .C EPSON LQ-300+ 4.2.7.3 Carriage Unit Removal Revision C PG adjust lever 1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) 2. Remove the printhead. (See 4.2.1 "Printhead Removal".) 3. Remove the timing belt from the carriage installation point. .C Carriage Unit CR guide shaft Timing Belt Carriage unit CR guide grounding plate CL UB Parallelism adjust bushing Parallelism adjust bushing Oil pad Installation Point Figure 4-12.
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OM .C EPSON LQ-300+ Revision C 4.2.7.4 Ribbon Feed Mechanism Removal 2. Remove the tension spring, 8.10 from the motor bracket and release the tension of the timing belt. (See 4.2.7.1 "CR Motor Assembly Removal".) 3. Release 3 hooks securing the RD cover to the left frame. 4. Remove the RD cover. CL UB .C Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) RD cover PG Adjust Lever -- Hook Figure 4-14. Hook at the PG Adjust Lever 7. 1.
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OM .C EPSON LQ-300+ Revision C 4.2.7.7 HP Sensor Removal 1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) 1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) 2. Remove the hook of the RPE sensor installed at the paper guide. 2. 3. Remove RPE sensor. Release 2 hooks of the HP sensor securing it to the base frame with tweezers and remove the sensor. 4. Remove the harness from the RPE sensor (white). 3. Remove the harness from the sensor (black).
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OM .C EPSON LQ-300+ 4.2.7.8 PG Sensor Removal 3. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) 2. Release 2 hooks of the PG sensor securing it to the left frame with tweezers and remove the sensor. 3. Remove the harness from the sensor (white). Remove the harness from the sensor (blue). Release lever position sensor (blue) CL UB .C 1. Revision C .F IX Figure 4-19.
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OM .C EPSON LQ-300+ Revision C 4.2.7.11 Paper Feed Mechanism Disassembly 1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) 1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) 2. Remove the platen grounding wire from the platen. 2. Remove the PF motor assembly. (See 4.2.7.10 "PF Motor Assembly Removal".) 3. Remove 1 screw (CBP, 3x10, Torque:0.59-0.78N.M) securing the PF motor assembly to the right frame. 3. Remove the release lever. 4.
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OM .C EPSON LQ-300+ 5. Remove the combination gear, 8.5, 25.2 from the right frame. Combination spring, 1.18 Hook at the right frame Plain washer, 5.2 x 0.3 x 10 .F IX CL UB .C Combination gear, 8.5, 25.2 Revision C BB S Gear, 27.5 Disassembly and Assembly TP :/ / Figure 4-22.
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OM .C EPSON LQ-300+ 4.2.7.12 Paper Guide Removal 1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) 2. Remove the platen. (See 4.2.7.2 "Platen Removal".) 3. Remove the carriage unit. (See 4.2.7.3 "Carriage Unit Removal".) 4. Remove the HP sensor. (See 4.2.7.7 "HP Sensor Removal".) 5. Remove the PG sensor. (See 4.2.7.8 "PG Sensor Removal".) 6. Remove the PF motor assembly and release lever. (See 4.2.7.10 "PF Motor Assembly Removal".) 7.
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TP .C CL UB .F IX BB S :/ / ADJUSTMENT CHAPTER 5 OM .
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OM .C EPSON LQ-300+ 5.1 Overview START This chapter explains the adjustment required after disassembling the printer. 5.1.1 Platen Gap Adjustment .C Move the carriage unit to the left end. Platen gap adjustment is required at the following cases. Printhead is replaced. Is the platen gap within the range of the setting? CL UB Carriage is replaced. CR guide shaft is removed. Parallelism adjust bushing is removed. Ink ribbon often gets jammed. Remove the upper housing. (Refer to Ch4.
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OM .C EPSON LQ-300+ 5.1.2 Bi-D Adjustment Bi-D adjustment is required at the following cases. Main board assembly is replaced. .C Printer mechanism is replaced. Follow the caution items below, and then, perform the steps for the platen gap adjustment. This test program used here is originally the program used for Connect the printer and the host computer by parallel interface cable. 2. Turn on the PC and the printer. 3. Set FF paper to the printer. 4.
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9. OM .C EPSON LQ-300+ Revision C The destination setting menu appears. Referring to the table below and using ↑ or Adjustment TP :/ / BB S .F IX CL UB .C ↓ key to shift the“>” mark,choose an appropriate setting and press ENTER. Overview Table 5-3.
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OM .C EPSON LQ-300+ Setting EHK USASTD ETT USASTD ECC(Kver) DEFSTD 10. The following screen appears. By using ↑ or ↓ key to shift “>” mark, select “Out Going” and press ENTER. CL UB Destination .C Table 5-3. Destination Setting Revision C .F IX 12. The printing mode select menu for Bi-D adjustment appears. Use ↑ or ↓ key to select the printing mode “Mode 1”and use ← or → key to change Bi-D values. After selecting them, press SPACE. Bi-D Printing starts. Adjustment TP :/ / BB S 11.
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OM .C EPSON LQ-300+ 13. Four rows of Bi-D pattern will be printed as follows. If four lines are not straight vertically, change the values and press SPACE to reprint Bi-D pattern. Continue this procedure until the gaps of Bi-D lines become less than 0.25 mm. Figure 5-2. Bi-D Adjustment .F IX CL UB .C Bi-D Adjustment: Less than 0.25mm Revision C BB S 14. After adjustment of Mode 1 is completed, repeat the same procedure for Mode 2 and Mode 4. Adjustment TP :/ / 15.
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TP .C CL UB .F IX BB S :/ / MAINTENANCE CHAPTER 6 OM .
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OM .C EPSON LQ-300+ 6.1 Maintenance Table 6-2. Lubrication Points When performing the maintenance, remove the AC cable from the AC socket. Never touch the printhead right after printing, as it is highly heated. BB S Lubrication poinsts of LQ-300+ are as shown in the following table. Refer to the table for types and amount of oil to be used for each point. Oil and grease have a great affect on performance of the product, especially on the durability and the performance at the lower temperature.
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OM .C EPSON LQ-300+ Lubricate G-26 on the 3 shafts and 1 boss of the left frame. G-26, 1/2 of rice Lubrication Points .C Lubricate G-26 on the shaft of the left frame. G-26, 1 of rice Combination Gear 5.1, 16.2 Driven pulley assy. Planetary lever assy. Spur Gear, Gear, 13.2 13.2 Spur Lubricate G-26 at 2 places on inside of cam at slope surface of the release lever. Release lever: G-26, 1 grain of rice BB S Figure 6-1.
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OM .C EPSON LQ-300+ Lubricate G-26 to the shaft of the drive PF roller and the rear driven PF roller. (4 places) Drive PF roller Lubricate G-26 into the hole of the right TR (tractor) frame facing to the TR guide shaft and the left TR frame. Rear driven PF roller .F IX Figure 6-5. PF Roller Assembly Paper guide assy. Set the paper guide assembly upside down and lubricate at the touching part of the PF roller assembly with the release shaft.
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OM .C EPSON LQ-300+ Move the carriage around the center, then lubricate G-26 on the touching parts of the 2 sides of the frame. Lubricate G-26 on the installing shaft of the Combination Gear, 17.5, 27 of the right frame. CL UB .C Carriage: G-26, 40mm x 2 places Combination gear 17.5, 27: G-26, 1/2 grain of rice Figure 6-11. Combination Gear 17.5, 27 .F IX Figure 6-9. Carriage Revision C Lubricate G-26 on the 2 touching position with CR motor assembly from the inside of the base frame.
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TP .C CL UB .F IX BB S :/ / APPENDIX CHAPTER 7 OM .
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OM .C EPSON LQ-300+ 7.1 Connector Summary Revision C Table 7-1. C395Main Connectors Connector Function Pins CN1 Parallel I/F 36 CN2 Serial I/F 6 CN3 HP Detector 2 CN4 PE (Rear) Sensor 2 CN5 Release Detector 2 CN6 PE (bottom) Detector 2 CN7 PG (Copy Mode) Detector 2 CN8 Power Board C294PSB/PSE 9 CN9 Printhead 12 CN10 CR Motor 4 CN11 PF Motor 4 CN12 CS Motor (Option) 10 CN13 Operation Panel C294PNL 12 CN16 Head 17 BB S .F IX CL UB .
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Table 7-4.
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Signal Name Function 1 O PFA Paper feed motor phase A 2 O PFA Paper feed motor phase A 3 O PFB Paper feed motor phase B 4 O PFB Paper feed motor phase B Pin I/O 6 O 7 I LED1 LED1 SW1 Switch 1 - GND Signal ground - GND Signal ground I SW2 Switch 2 11 I SW3 Switch 3 12 I SW4 Switch 4 8 9 CL UB 10 Table 7-11.
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OM .C EPSON LQ-300+ Table 7-13. CN16-Head I/O Signal Name Function HD13 Head data 13 16 HD1 Head data 1 17 HD5 Head data 5 Appendix TP :/ / BB S .F IX CL UB 15 .
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7.2 Parts List Revision C Table 7-14. LQ-300+ Parts List Code The following table shows parts name of this product. Refer to the exploded diagrams for parts’ number. 131 Table 7-14. LQ-300+ Parts List 103 HOUSING,UPPER 104 SHIELDPLATE,LOWER 105 COVER ASSY.,PRINTER 106 KNOB;W 109 SHEET GUIDE ASSY.
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516 PULLEY ASSY.,DRIVEN 544 517 HARNESS,HP 545 OM .C 518 C.P.B SCREW 546 CABLE,HEAD,FRONT 519 MOTOR ASSY.,PF 547 CABLE,HEAD,REAR 520 PAPER GUIDE 559 DAMPER 521 DETECTOR,PE,REAR 560 FRAME,BASE 522 HARNESS,PE,REAR 561 PAPER GUIDE,SUPPORT 523 DETECTOR,PE,BOTTOM 562 GROUNDING PALTE,SHAFT,CR 524 HARNESS,PE,BOTTOM 563 SHEET,CABLE,HEAD 525 HOLDER,ROLLER,PF 564 GEAR,34 526 ROLLER,PF,DRIVEN 565 SPUR GEAR,27.
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OM .C EPSON LQ-300+ Table 7-14. LQ-300+ Parts List Part Name LEVER,RELEASE 592 SHEET,CABLE,CR 650 PRINTHEAD,DH24-0U0 651 LABEL,WARNING Appendix TP :/ / BB S .F IX CL UB 590 .
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OM .C EPSON LQ-300+ 7.3 Exploded Diagrams Appendix TP :/ / BB S .F IX CL UB .C Exploded diagrams of LQ-300+ are shown on the following pages.
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M. 109 .C O 105 570 180 124 UB 111 128 127 128 127 127 127 127 CL 451 127 127 127 127 450 115 103 127 .F IX 127 320 123 118 127 300 200 132 117 132 125 116 120 BS 100 129 400 117 106 // B 119 104 129 P: 500 131 401 400 (320) 127 130 200 LQ-300+ No.01 Rev.
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M. 512 514 516 513 505 544 527 525 541 526 510 532 528 509 510 .C O 526 579 582 527 521 559 UB 528 520 523 542 577 CL 501 518 651 539 535 592 546 540 547 536 563 .F IX 559 514 529 524 650 517 522 545 571 581 531 567 534 538 502 576 566 542 565 533 BS 562 532 531 506 561 590 559 564 559 569 507 // B 503 575 508 560 581 581 519 514 515 580 504 P: 573 578 581 LQ-300+ No.02 Rev.
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OM .C EPSON LQ-300+ 7.4 Component Layout Revision C C395MAIN BOARD -MOUNTED SIDE :/ / BB S .F IX CL UB .C This section provides component layouts. Appendix TP Figure 7-2.
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OM .C EPSON LQ-300+ :/ / BB S .F IX CL UB .C C395MAIN BOARD-SOLDERED SIDE Revision C Appendix TP Figure 7-3.
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C294PSE BOARD Revision C :/ / BB S .F IX CL UB .C C294PSB BOARD OM .C EPSON LQ-300+ Appendix TP Figure 7-4. Component Layout-C294PSB Figure 7-5.
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OM .C EPSON LQ-300+ Appendix TP :/ / BB S Figure 7-6. Component Layout-C294PNL .F IX CL UB .
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OM .C EPSON LQ-300+ 7.5 Electric Circuit Schematics The following pages show circuit schematics below. .C C395MAIN Board Revision C C294PSB Board C294PSE Board Appendix TP :/ / BB S .
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// P: IX .F BB S UB .C OM .
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BS // B P: .C OM . UB CL IX .
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BS // B P: .C OM . UB CL IX .
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BS // B P: .C OM . UB CL IX .