Service manual

ManualsBrandsEpson ManualsComputer equipmentLX-300II - LX-300+ II Impact Printer

EPSON LX-300+

9-pin Serial Impact Dot Matrix Printer

SEDM997003

SERVICE MANUAL

Summary of content (106 pages)

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SERVICE MANUAL 9-pin Serial Impact Dot Matrix Printer EPSON LX-300+ ® SEDM997003
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Notice: 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, recording, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION. The contents of this manual are subject to change without notice. All effort have been made to ensure the accuracy of the contents of this manual.
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PRECAUTIONS Precautionary notations throughout the text are categorized relative to 1) Personal injury and 2) damage to equipment. W A R N IN G Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing procedures preceded by a WARNING heading. C A U T IO N Signals a precaution which, if ignored, could result in damage to equipment.
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PREFACE This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of LX-300+. The instructions and procedures included in here are intended for the experienced repair technicians, and close attention should be given to the precautions on the preceding page. Chapters are organized as follows: CHAPTER 1. PRODUCT DESCRIPTIONS Provides a general overview and specifications of the product. CHAPTER 2.
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Revision Status Revision Date of Issue A May 11, 2000 Description First Release
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Contents Chapter 1 Product Description 1.1 Features .............................................................................................. 9 1.2 Printing Specification ...................................................................... 10 1.2.1 Printing Specification ................................................................. 10 1.2.2 Paper Feeding ........................................................................... 13 1.2.3 Electrical Specification ..................................
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Chapter 3 Troubleshooting 3.1 Overview ........................................................................................... 56 3.2 Troubleshooting .............................................................................. 57 3.2.1 Initialization Check .................................................................... 57 3.2.2 Check Performance By Self-Check Function ............................ 57 3.2.2.1 Indicator LED ...................................................................... 57 3.
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CHAPTER 1 PRODUCT DESCRIPTION
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LX-300+ Revision A 1.1 Features Paper supports EPSON LX-300+ is a 9-pin serial impact dot matrix printer.
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LX-300+ Revision A 1.2 Printing Specification Table 1-1. Print Speed and Printable Columns Printing mode 1.2.1 Printing Specification NLQ Print method: Impact dot matrix Number of pins: 9 pins Print pin arrangement: 9x1 Print pin diameter: 0.29 mm (0.
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LX-300+ Revision A International character sets: 13 countries Character tables: Standard version (13 character table) Italic table PC850 (Multilingual) PC863 (Canadian-French) PC861 (Icelandic) Abicomp ISO Latin 1 ISO 8859-15 PC437 (US, Standard Europe) PC860 (Portuguese) PC865 (Nordic) BRASCII Roman 8 PC858 NLSP version (38 character tables) Italic table PC850 (Multilingual) PC853 (Turkish) PC852 (East Europe) PC866 (Russian) PC869 (Greek) Code MJK (CSFR) ISO Latin 1T (Turkish) PC 774 (LST 1283
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LX-300+ Revision A Character tables and typefaces: Table 1-3. Character Tables and Typefaces Character table Table 1-3.
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LX-300+ Revision A 1.2.2 Paper Feeding Table 1-4. Release Lever Feeding method: Friction feed (rear) Lever position Push tractor feed (rear) Push and Pull tractor feed (rear) Pull tractor feed (rear, bottom) Tractor Feeder: 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: Rear in, top out Rear in, top out Rear in, top out Rear or bottom in, top out 4.
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LX-300+ Revision A 1.2.3 Electrical Specification 1.2.4 Environmental Condition 120 V version Temperature: 5 to 35 °C (operating*1) 15 to 25 °C (operating*1,*2) -30 to 60 °C (non-operating) Humidity: 10 to 80% RH (operating*1) 30 to 60% RH (operating*1,*2) 0 to 85% RH (non-operating) Resistance to shock: 1 G, within 1ms (operating) 2 G, within 2ms (non-operating*3) Resistance to vibration: 0.25 G, 10 to 55 Hz (operating) 0.
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LX-300+ Yellow Revision A 0.5 million characters (Draft 10 cpi, 14 dots/character) 1.2.7 Safety Approvals 120 V version Safety standards: UL1950 CSA C22.2 No. 950 EMI: FCC part15 subpart B class B CSA C108.8 class B 230 V version Safety standards: EN60950 (VDE) EMI: EN55022 (CISPR pub.22) class B AS/NZS 3548 class B 1.2.
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LX-300+ Revision A 1.2.10 Printable Area Table 1-6. Printable Area for Cut Sheet Cut sheets P r in ta b le A r e a Single Sheet Multi Part PW (Width) Refer to 1.7 "Paper Specifications" Refer to 1.7 "Paper Specifications" PL (Length) Refer to 1.7 "Paper Specifications" Refer to 1.
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LX-300+ Revision A Continuous paper Envelop R M L M T M P e r fo r a tio n P r in ta b le A r e a P r in ta b le A r e a B M P e r fo r a tio n Figure 1-3. Printable Area for Envelop Figure 1-4. Printable Area for Continuous Paper Table 1-7. Printable Area for Envelop Table 1-8. Printable Area for Continuous Paper Envelope Printable Area Continuous Paper PW (Width) Refer to 1.7 "Paper Specifications" PL (Length) Refer to 1.7 "Paper Specifications" PW (Width) Refer to 1.
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LX-300+ Revision A Roll paper P W L M B M T M P r in ta b le A r e a B M Figure 1-5. Printable Area for Roll Paper Table 1-9. Printable Area for Roll Paper Continuous Paper PW (Width) Refer to 1.7 "Paper Specifications" PL (Length) Refer to 1.7 "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.
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LX-300+ Revision A 1.3 Interface Specifications LX-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 IEEE-1284 compatibility mode Adaptable connector: 57-30360 (Amphenol) or equivalent Synchronization: -STROBE pulse Handshaking: BUSY and -ACKLG signals Signal level: TTL compatible (IEEE-1284 level 1 device) Figure 1-6.
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LX-300+ Revision A BUSY signal is active (HIGH level) under the conditions below: In the process of receiving data Table 1-12. Connector Pin Assignment and Signals Pin No.
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LX-300+ Revision A 1.3.2 Parallel Interface (Reverse Channel) Transmission mode: Adaptable connector: Table 1-15. Connector Pin Assignment and Signals IEEE-1284 nibble mode See 1.3.1 "Parallel Interface (Forward Pin No. Signal Name Channel)" Return GND Pin In/Out Functional Description 1 HostClk 19 In Host clock signal. 2 DATA1 20 In Parallel input data to the printer.
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LX-300+ Revision A Table 1-15. Connector Pin Assignment and Signals Pin No. Signal Name Return GND Pin In/Out 35 +5V -- Out 17 Chassis -- -- 16, 33, 19-30 GND -- -- 15, 34 NC -- -- Connector: 25 pin subminiature D-shell connector (female) Table 1-16. Connector Pin Assignment and Signals Functional Description This line is pulled up tp +5V through 1.0 kΩ resister. Chassis GND. Pin No. Signal Name In/Out 2 TXD Out Transmit data.
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LX-300+ Revision A Auto: 1.3.4 Interface Selection 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.
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LX-300+ Revision A 1.4 Operation 1.4.1.1 Switches Operation in normal mode In normal mode, pressing panel switches executes following function; 1.4.1 Control Panel Table 1-17. Operation in Normal Mode 4 switches and 4 LEDs are on the panel as shown below. Tear Off Tear Off LF/FF Load/Eject Paper Out Switch Function Pause -Alternates printing and non-printing status. -Enables Micro Adjustment function and Font selection, holding it down for 3 seconds. Load/Eject -Loads or ejects paper.
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LX-300+ Revision A Operation in default setting mode *3 Font (Green) -The status of Font selection is displayed by 2 Font LEDs when continuous paper is out of the Tear-off position. -Both LEDs blink when continuous paper is in the Tear-off position. : Draft : Draft Condensed : Roman : Roman Condensed : Sans serif : Sans serif Condensed : Tear Off ( : LED On, : LED Off, : LED Blinks) The following switches are used in default setting mode; Table 1-19.
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LX-300+ Revision A 1.4.2 Functions 1.4.2.2 Operation at Power-on Self test 1.4.2.1 Usual Operation Prints the self test pattern. To cancel it, make printer pause and turn off the power. Pause -This switch alternates printer activity between printing and nonprinting. -By holding it down over 3 seconds when the printer is in the stand by state, the Micro Adjust function is enabled. By pressing it again, this function is disabled.
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LX-300+ 3. 4. 5. Revision A Press Tear Off button. The current setting and the “Usage of this mode” by selected language will be printed on the paper set in the paper path at that time. A print sample is shown in appendix A. Item Setting / Value *2 High speed draft OFF, ON Select Menu by Tear Off button. Font LEDs show the menu which is selected at that time.
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LX-300+ Revision A 1.4.2.4 Bi-d. Adjustment 1.4.3 Errors Bi-d. adjustment can be adjusted by users. Bi-d. adjustment method is as follows. Paper out error: 1. Release lever error: When the printer fails to feed a sheet, it goes a paper out error. Turning the printer on while pressing Pause switch. The guide to adjust Bi-d alignment in this mode and the first alignment pattern will be printed. 2. Select the most closely aligned number by pressing LF/FF (↓) and Load/ Eject (↑) switches.
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LX-300+ Revision A 1.5 Control codes Table 1-22. ESC/P2 1.5.
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LX-300+ Revision A 1.5.2 IBM 2390 Plus Emulation Table 1-23. IBM 2390 Plus emulation Table 1-23.
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LX-300+ Revision A 1.5.3 Bi-Directional Commands -[Save] column shows that SV commands is effective to each feature or not. -{: All parameters are saved., ∆: Some limited parameters are saved.,-: No parameter is saved. Reply printer ID Reply printer ID: [ESC][SOH]@EJL[SP]ID[CR][LF] The printer sends the following ID string in reply to this command. Table 1-25. Bi-Directional Commands Table 1-24.
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LX-300+ Revision A Table 1-28. NLSP only Table 1-26. Note for Table 1-25 m1 set by AT/CT m2 set by AT m3 set by AT 0 0 0 1 All parameters that can be set *4 m2 and m3 apply to the following ID number. (See Table 1-27 & Table 1-28.) m2 m3 Character table m2 m3 Character table 0EH 30H PC866 UKR 29H 00H PC 708 0FH 00H PC869 2AH 00H PC720 0DH 20H PCAR_864 7FH 02H ISO 8859-2 1BH 00H MAZOWIA 2DH 00H PC771 *5 m1=0 to 7 only Table 1-27. Std and NLSP ver.
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LX-300+ Revision A 1.5.3.1 Reply Printer Status Table 1-29.
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LX-300+ Revision A Paper_path 1.5.3.2 Packet commands Table 1-32. Paper_Path Table 1-34.
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LX-300+ Revision A 1.6 Initialization Power-on initialization The initialization of this level is activated by power-on or cold-reset command (remote RS command). This initialization is; to initialize the printer mechanism. to execute Operator initialization. Operator initialization The initialization of this level is activated by -INT signal (negative pulse). This initialization is; to clear the all buffers of data. to cancel the download character definition.
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LX-300+ Revision A Cut sheet (multi part) 1.7 Paper Specifications Table 1-36. Cut Sheet (Multi part) Cut sheet (single sheet, not multi part) Table 1-35. Cut Sheet (single sheet, not multi part) Manual insertion Minimum Maximum CSF single-bin Minimum (inch) (mm) (3.9) 100 (10.1) (257) Length (inch) (mm) (3.9) 100 (14.3) (364) Maximum (3.9) 100 (10.1) 257 (7.2) 182 (8.5) 216 Copies Length (inch) (mm) (3.9) 100 (14.3) 364 (10.1) 257 (14.
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LX-300+ Revision A Envelope Continuous paper (Single sheet and Multipart) Table 1-37. Envelope Minimum Envelop (No. 6) (6.5) 165 (inch) Length (mm) (3.6) 92 Width (inch) (mm) (9.5) 241 Length (inch) (mm) (4.1) 105 Envelop (No. 10) (inch) (mm) (g/m2) (lb.) Quality (0.0063) 0.16 (0.0205) 0.52 The difference of thickness at the printable area is within 0.25mm (0.0098 inch).
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LX-300+ Revision A Labels 63.5 mm (2.5 inch) min. Table 1-39. Continuous Paper with Labels Rear Entry Min. Max. --- Label size Base sheet width (inch) (mm) Base sheet length (one page) (inch) (mm) Base sheet thickness (inch) (mm) Total thickness (inch) (mm) Label weight Bottom Entry (g/m2) (lb.) Quality Min. Max. See the figure below. --- (4) 101.6 (10) 254 --- (4) 101.6 (22) 558.8 --- --- (0.0028) 0.07 (0.0035) 0.09 --- --- (0.0063) 0.16 (0.0075) 0.
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LX-300+ Revision A 1.8 Physical Specifications Physical Specifications (Without pull tractor) Dimensions: 366 x 275 x 159 mm (WxDxH) Mass: Approx. 4.4 kg Appearance: See the figure below. Physical Specifications (CSF) Dimensions: 366 x 441 x 370 mm (WxDxH) Mass: Approx. 4.6 kg Appearance: See the figure below. Figure 1-10. Appearance With CSF Figure 1-9.
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LX-300+ Revision A 1.9 Accessories Table 1-41. Enclosed Parts Enclosed Items Quantity User's manual 1 Driver disk 1 Ribbon cartridge (Black) 1 Power supply cable (230 V Version) 1 Table 1-42. Expendables Enclosed Items Description Ribbon cartridge (Black) #8750 Ribbon pack (Black) #8758 Ribbon cartridge (Color) S015073 Table 1-43.
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CHAPTER 2 OPERATING PRINCIPLES
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EPSON LX-300+ Revision A 2.1 Overview LX-300+ consists of the printer mechanism and electric circuit boards. Power Supply Board Main Board C294MAIN Printer Mechanism M-M310 C294PSB/PSE Panel Board C294PNL Figure 2-1. Component Unit Printer mechanism: M-3M10 Circuit board Main (control circuit): C294MAIN Board Power: C294PSB / C294PSE Board Panel: C294PNL Board The following sections describe the operating principles of each unit.
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EPSON LX-300+ Revision A 2.2 Printer Mechanism (M-3M10) Platen gap adjustment mechanism The following is main components of the LX-300+ printer mechanism.
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EPSON LX-300+ Revision A 2.2.1 Printhead The table below shows the printhead specifications. Table 2-1. Printhead Specifications Item Specification Number of wires 9 Diameter of wire φ0.29 mm Wire configuration See the figure below. Note: The figure is seen from the back of the head facing printing side. Direct current coil resistance 33.3 ±3.3 Ω (25°C) Head drive method Rated voltage drive Head drive voltage 35+2.1/-3.5 V • Normal: 0.75 A (Standard) • Copy: 0.85 A (Standard) 1.
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EPSON LX-300+ Revision A 2.2.2 Carriage Mechanism The following is the components of the LX-300+ carriage mechanism and its explanation. (Refer to Figure 2-2, "Printer Mechanism Block Diagram") Carriage: 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: Shifts the carriage parallel to the platen. HP detector: Detects carriage home position.
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EPSON LX-300+ Revision A The following table shows the various carriage speed modes. Table 2-4. Carriage Speed Mode Carriage speed mode CR drive frequency [Hz] A 3600 B 3375 C D Printing mode 2700 2250 Phase drive [pps] Current limit (A/phase) Front rush High speed Normal speed Low speed Rear rush Color 2-2 0.79 0.79 0.70 0.70 0.70 BW 2-2 0.70 0.59 0.59 0.59 0.59 Color 2-2 0.79 0.79 0.70 0.70 0.70 BW 2-2 0.70 0.59 0.59 0.59 0.
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EPSON LX-300+ Revision A 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. Table 2-5. HP detector Specifications Item Specification Method Mechanical contact method 2.2.3.2 Color Ribbon Driving Mechanism (Option) Switching rate 0.6 to 1.
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EPSON LX-300+ Revision A RIBBON CARTRIDGE DETECTOR Color ribbon drive circuit Ribbon detector detects if the color ribbon is installed or not. Detect Timing When the power is applied. Ribbon detector When recovering from the economy mode. When the printing is started. Table 2-7. Ribbon Detector Specifications Item CS motor CS cam CS lever assembly Specification Method Mechanical contact method Switching rate 0.6 to 1.
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EPSON LX-300+ Revision A 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 Color mechanism initialization Color mechanism initialization shifts color mechanism for the black ink area to be at the home position.
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EPSON LX-300+ Revision A 2.2.5 Paper Feed Mechanism PF MOTOR This mechanism consists of paper feed motor (PF motor), paper feed gears, platen, rear paper end detector, bottom paper end detector and push tractor unit. (Refer to Figure 2-2, "Printer Mechanism Block Diagram") LX-300+ uses the stepping motor for PF motor. Open loop control switches the phase according to the LX-300+ uses stepping motor for PF motor.
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EPSON LX-300+ Revision A 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] Table 2-11. RPE Detector Specifications Item Specification Method Mechanical contact method Switching rate 0.6 to 1.
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EPSON LX-300+ Revision A 2.2.6 Release Mechanism The table below shows the release detector specifications. This mechanism switches the flow of PF motor driving forth between to the friction feed and to the tractor feed. Compression spring Plain washer Tractor gear Table 2-13. Release Detector Specifications Item Mechanical contact method Switching rate 0.6 to 1.
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EPSON LX-300+ Revision A 2.3 Electric Circuit Operating Principles 2.3.1 MAIN Board (Control Board) Electric Circuit The figure below is the MAIN board block diagram. Control Panel HP sensor RPE Sensor Release Sensor BPE Sensor PG Sensor Figure 2-7.
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EPSON LX-300+ Revision A 2.3.2 C294PSB / C294PSE Board Table 2-14. Main Elements Elements CPU G/A * PROM Location IC3 IC6 IC7 Function RISC C33208 CPU, QFP 128 pin • Outside clock 19.66 MHz/ Inside clock 39.
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CHAPTER 3 TROUBLESHOOTING
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EPSON LX-300+ Revision A 3.1 Overview Troubleshooting This chapter describes how to troubleshoot problems when any problems occurred to the printer. Initialization Check W A R N IN G C A U T IO N 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 Check performance by self-check function.
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EPSON LX-300+ Revision A 3.2 Troubleshooting 3.2.2 Check Performance By Self-Check Function 3.2.1 Initialization Check Before troubleshooting, check the following basic items. 1. When printer can perform printing, perform self-test and check if any troubles occur. 2. When the printer cannot perform any printing, check the setting by “Default Setting”. (Refer to Chapter 1.) 3. Check if the outside and inside the printer is noticeably dirty or if any parts are broken.
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EPSON LX-300+ Revision A Release Lever Error This error will be indicated when wrong release lever operation is performed. For example, if you change the release lever setting when the printer already starts feeding paper, this error will be generated. Solution Reset the release lever. 3.2.3 Identify Problems From Symptoms This section procedure to identify the problems from the abnormal symptoms.
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EPSON LX-300+ Revision A Table 3-4. Printer Mechanism Does Not Operate. Table 3-3. Control Panel LED Does Not Light On. Cause Check Point Y/N Solution Blowout of a fuse on the power board. 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. Connector is not connected to the power board. Are connectors connected to the power board properly? NO Replace the power board. Power switch is defective.
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EPSON LX-300+ Revision A Table 3-7. Paper Feed is Abnormal. Table 3-6. Self Test Print is Abnormal. Cause Any of CN3 to CN12 is not connected to the main board properly. Printhead driver is defective. Bi-d is not correct. Printhead is defective. Head FFC is not connected properly or broken. Check Point Are all connectors connected properly? - Y/N NO Connect them properly. - Replace the main board.
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EPSON LX-300+ Revision A Table 3-9. Printing Operation is Abnormal When it is On-Line. (Self-Test is Normal.) Cause Check Point Y/N Solution Initial setting is wrong. 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.
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EPSON LX-300+ Revision A 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. Table 3-11. Motor Check Table 3-12. Sensor Check Item CR motor PF motor CS motor (option) Operation Specification 1. Set the multimeter to the resistance measuring range. 5.7Ω ±10% 2. Connect the one side of the probe to 1 or 2 pin.
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EPSON LX-300+ Revision A 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 Item Printer driver (Q3 ～ Q11) Troubleshooting 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. Specification The resistance should NOT be “0” or infinity.
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CHAPTER 4 DISASSEMBLY AND ASSEMBLY
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EPSON LX-300+ Revision A 4.1 Overview Table 4-1. Recommended Tools Tools This chapter explains the disassembly and assembly of LX-300+. Needle-nose pliers B740400100 Nipper B740500100 Tweezers B741000100 Soldering bit B740200100 When disassembling and adjusting the printer, remove E ring holder #2.5 B740800400 the AC cable off the socket. Never touch the printer right after it finishes printing, for the printhead is highly heated. + driver No.
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EPSON LX-300+ Revision A 4.1.3 Service Checks After Repair Table 4-3. Check List for Repaired Printer Category Before returning the printer back to the user, use the check list below to confirm the quality of the repaired printer. Component Table 4-3.
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EPSON LX-300+ Revision A 4.2 Disassembly and Assembly The figure below is the disassembly flowchart for main component. This section explains the disassembly and assembly of LX-300+. Unless otherwise specified, assembly can be done in the reverse order of the disassembly procedure. Anything that service person should pay attention to is described under “Check Point”. Any adjustment required after assembly is described under “Adjustment”.
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EPSON LX-300+ Revision A 4.2.1 Printhead Removal Printhead 1. Remove the cover and the printer. 2. Remove 1 screw (CPB, 3x14) securing the printhead to the carriage assembly. 3. Lift the printhead a little bit. Unlatch 2 hooks securing the printhead FFC to carriage unit. 4. Remove FFC from the printhead. CPB (3x14) FFC Carriage Assembly C A U T IO N Check if the printer is powered off before removing the printhead.
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EPSON LX-300+ Revision A 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) securing the upper housing to the lower housing. 4. Remove the upper housing. C H E C K P O IN T 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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EPSON LX-300+ Revision A 4.2.3 Printer Mechanism Removal Printer Mechanism 1. Remove the upper housing. (See 4.2.2 "Upper Housing Removal".) 2. Remove 3 screws (CBP, 3x10) securing the upper shield plate to the lower housing. Remove the shield cover. Upper Shield Plate CPB (3x10) Main Board Assembly CBB (3x14) with washer CBB (3x14) with washer Printer Mechanism Figure4-4. Harness Removal Figure4-3. Upper Shield Plate 3.
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EPSON LX-300+ Revision A 4.2.4 Board Assembly and Panel Removal 4.2.5 C294MAIN 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. 3. Remove 3 screws (CBP, 3x10) securing the panel board assembly to the lower housing. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) 3.
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EPSON LX-300+ Revision A 4.2.6 P/S Board Assembly Removal Lower Shield Plate CP (M3x6) Hexagon Nut CBP (3x10) CN13 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 P/S board assembly. 4. Remove the power switch from the lower housing. 5. Remove the harness connecting P/S board assembly to the main board assembly. (CN8 of the main board assembly) 6.
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EPSON LX-300+ Revision A 4.2.7 Printer Mechanism Disassembly 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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EPSON LX-300+ Revision A 4.2.7.2 Platen Removal Bushing, 11 1. 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 Gear, 34 Left frame To unhook the combination gear 17.5, 27, hold it and pull it to the arrow direction. Bushing, 11 Platen grounding wire Combination gear, 17.5, 27 Combination gear, 17.
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EPSON LX-300+ Revision A 4.2.7.3 Carriage Unit Removal 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. CR guide shaft Carriage Unit Carriage unit CR guide grounding plate Timing Belt Parallelism adjust bushing Parallelism adjust bushing Oil pad Left frame Base frame Right frame Installation Point Figure4-13.
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EPSON LX-300+ Revision A 4.2.7.4 Ribbon Feed Mechanism Removal 1. Remove the printer mechanism. (See 4.2.3 "Printer 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. PG Adjust Lever -- Hook Planetary lever assy. RD cover RD ratchet Timing belt Figure4-14. Hook at the PG Adjust Lever 7.
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EPSON LX-300+ Revision A 4.2.7.5 RPE Sensor Removal 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.
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EPSON LX-300+ Revision A 4.2.7.8 PG Sensor Removal 4.2.7.9 Release Lever Position 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. Release 2 hooks of the PG sensor securing it to the left frame with tweezers and remove the sensor. 2. Release 2 hooks of the release lever position sensor securing it to the right frame with tweezers and remove the sensor. 3.
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EPSON LX-300+ Revision A 4.2.7.10 PF Motor Assembly Removal 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. 3. Remove 1 screw (CBP, 3x10) securing the PF motor assembly to the right frame. Remove the PF motor assembly. (See 4.2.7.10 "PF Motor Assembly Removal".) 3. Remove the release lever. 4.
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EPSON LX-300+ 5. Revision A Remove the combination gear, 8.5, 25.2 from the right frame. Hook at the right frame Combination spring, 1.18 Plain washer, 5.2 x 0.3 x 10 Combination gear, 8.5, 25.2 Gear, 27.5 Figure4-22.
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EPSON LX-300+ Revision A 4.2.7.12 Paper Guide Removal 8. 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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CHAPTER 5 ADJUSTMENT
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EPSON LX-300+ Revision A 5.1 Overview This chapter explains the adjustment required after disassembling the printer. 5.1.1 Platen Gap Adjustment START 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? Carriage is replaced. CR guide shaft is removed. Adjust the platen gap at the left end. Parallelism adjust bushing is removed. Move the carriage unit to the right end.
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EPSON LX-300+ Revision A 5.1.2 Bi-D Adjustment Bi-D adjustment is required at the following cases. Main board assembly is replaced. Printer mechanism is replaced. Printer mechanism is removed. Follow the steps below for the platen gap adjustment. 1. 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. Insert FD that contains the adjustment program and click “GWBASIC.EXE” in the disk to execute GWBASIC.
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EPSON LX-300+ 7. Revision A 9. The program will ask you the production line No. Ignore it and press ENTER. The destination setting menu appears. Perform settings accordingly. The current destination settings are as follows. 8. Table 5-3. Destination Setting List (TBD) Printer 9/24 pin select screen appears. Use ↑ and ↓ key to shift “>” mark to the left of “(1) 9 pin” and press ENTER to select 9 pin printer.
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EPSON LX-300+ Revision A 11. When you select the destination, select menu below appears. You can select from inspection within the production line (In line) or inspection for shipment (Out Going). Use ↑ and ↓ key to shift “>” mark to the left of “Out Going” and press ENTER. 12. On the next screen, you can input the number of printing columns per one movement of the carriage. As the carriage width of LX-300+ is 80, use ↑ and ↓ key to shift “>” mark to the left of “(1) 80 column” and press ENTER.
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EPSON LX-300+ Revision A 15. Input the printing mode and the settings you want to use and input ENTER (Write) to confirm it. Press space key and the following printing pattern will be printed. Table 5-4. Bi-D Rated Setting Printing Mode Value “A” mode 0 (High Speed draft) TBD mode 1 (Draft) TBD mode 4 (NLQ) TBD 17. When you finished adjustment, finish the program by pressing “ESC” several times. C A U T IO N 16.
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CHAPTER 6 MAINTENANCE
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EPSON LX-300+ Revision A 6.1 Maintenance Table 6-2. Lubrication Points Fig. Appropriate maintenance is necessary to keep the printer in the best condition and prevent from troubles.
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EPSON LX-300+ Revision A Lubrication Points Lubricate G-26 on the 3 shafts and 1 boss of the left frame. G-26, 1/2 grain of rice Lubricate G-26 on the shaft of the RD ratchet. G-26, 1 grain of rice Lubricate G-26 at 3 places on 3 shafts at the right frame. Shafts at the right frame assembly: G-26, 1 grain of rice RD ratchet shaft Combination Gear 5.1, 16.2 Driven pulley assy. Planetary lever assy. Spur Spur Gear, Gear, 13.2 13.2 Figure 6-3.
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EPSON LX-300+ Revision A Drive PF roller Lubricate G-26 to the shaft of the drive PF roller and the rear driven PF roller. (4 places) Lubricate G-26 into the hole of the right TR (tractor) frame facing to the TR guide shaft and the left TR frame. PF roller assembly: G-26, 1/2 grain of rice Tractor assembly: G-26, 1/2 grain of rice Rear driven PF roller Figure 6-5. PF Roller Assembly Release shaft Paper guide assy.
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EPSON LX-300+ Revision A Move the carriage around the center, then lubricate G-26 on the touching parts of the 2 sides of the frame. Carriage: G-26, 40mm x 2 places Figure 6-9. Carriage Lubricate G-26 on the installing shaft of the Combination Gear, 17.5, 27 of the right frame. Combination gear 17.5, 27: G-26, 1/2 grain of rice Figure 6-11. Combination Gear 17.5, 27 Lubricate G-26 on the 2 touching position with CR motor assembly from the inside of the base frame.
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CHAPTER 7 APPENDIX
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EPSON LX-300+ Revision A 7.1 Connector Summary Table 7-1. C294MAIN Board Connector Summary Connector The figure below illustrates how the primary components are connected.
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EPSON LX-300+ Revision A Table 7-8. Connector Pin Assignments - CN9 Table 7-4.
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EPSON LX-300+ Revision A Table 7-12. Connector Pin Assignments - CN13 Table 7-10. Connector Pin Assignments - CN11 Pin I/O 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 Table 7-11.
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EPSON LX-300+ Revision A 7.2 Parts List Table 7-13. Parts List Number The following table shows parts name of this product. Refer to the exploded diagrams for parts’ number. Table 7-13. Parts List Number Appendix Parts Name 100 "HOUSING ASSY.,LOWER" 101 INSULATOR;A 102 INSULATOR;B 103 "HOUSING,UPPER" 104 "SHIELDPLATE,LOWER" 105 "COVER ASSY.,PRINTER" 106 KNOB;W 109 SHEET GUIDE ASSY.
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EPSON LX-300+ Revision A Table 7-13. Parts List Number Appendix Table 7-13. Parts List Parts Name Number Parts Name 516 "PULLEY ASSY.,DRIVEN" 542 "BUSHING,PARALLEL,ADJUST" 517 "HARNESS,HP" 543 "CABLE,HEAD" 518 C.P.
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EPSON LX-300+ Revision A Table 7-13. Parts List Number Appendix Parts Name 571 "COMBINATION GEAR,17.5,27" 573 "GROUNDING PLATE,CS" 574 "GROUNDING WIRE,LEFT" 575 "GROUNDING WIRE,RIGHT" 576 "GROUNDING PLATE,PF" 577 "SHEET,PROTECT,CABLE" 578 "SHEET,PROTECT,M/B" 579 "SHEET,CABLE,CR" 580 "C.B.P-TITE,3X10,F/ZN" 581 C.B.S.
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EPSON LX-300+ Revision A 7.3 Exploded Diagrams 180 109 105 570 124 127 127(126/for EAI) 451 111 127 128 127 127 128 127 127 127 127 127 115 103 127 127 190 450 320 300 200 123 118 132 127 117 132 120 125 116 129 100 131 106 400 102 500 117 119 129 104 401 400 320 101 127 130 200 102 L-300 No.01 Rev.01 10202 Figure 7-2.
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EPSON LX-300+ Revision A 554 512 526 514 516 527 556 525 541 551 553 526 527 505 513 544 510 509 510 528 521 532 559 528 555 558 520 522 523 552 557 542 550 577 501 651 518 529 530 524 650 543 559 579 539 517 535 545 514 571 581 531 563 502 576 540 537 567 536 534 538 566 542 565 533 532 562 531 506 561 590 559 564 559 569 503 575 568 560 574 578 581 511 581 580 573 581 581 514 515 504 581 L-300 No.02 Rev.01 10202 Figure 7-3.
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EPSON LX-300+ Revision A 7.
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EPSON LX-300+ Revision A 7.5 Circuit Schematics The following pages show circuit schematics below.
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