Epson LX-300 Service Manual
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Epson LX-300 Service Manual

9-pin serial impact dot matrix printer
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SERVICE MANUAL

9-pin Serial Impact Dot Matrix Printer
EPSON LX-300+
®
SEDM997003

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Summary of Contents for Epson LX-300

  • Page 1: Service Manual

    SERVICE MANUAL 9-pin Serial Impact Dot Matrix Printer EPSON LX-300+ ® SEDM997003...
  • Page 2 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. However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them.
  • Page 3 1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN. 2. MAKE CERTAIN THAT THE SOURCE VOLTAGES IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PRODUCT HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE.
  • Page 4 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.
  • Page 5 Revision Status Revision Date of Issue Description May 11, 2000 First Release...

  • Page 6: Table Of Contents

    Contents Chapter 1 Product Description 1.5.2 IBM 2390 Plus Emulation ............30 1.5.3 Bi-Directional Commands ............31 1.5.3.1 Reply Printer Status ............33 1.1 Features ....................9 1.5.3.2 Packet commands .............. 34 1.2 Printing Specification ..............10 1.2.1 Printing Specification ..............10 1.6 Initialization ..................
  • Page 7 Chapter 3 Troubleshooting 4.2.7.12 Paper Guide Removal ............81 3.1 Overview ................... 56 Chapter 5 Adjustment 3.2 Troubleshooting ................57 3.2.1 Initialization Check ..............57 5.1 Overview ..................83 3.2.2 Check Performance By Self-Check Function ......57 5.1.1 Platen Gap Adjustment ............. 83 3.2.2.1 Indicator LED ..............

  • Page 8: Chapter 1 Product Description

    C H A P T E R PRODUCT DESCRIPTION...

  • Page 9: Features

    LX-300+ Revision A 1.1 Features Paper supports EPSON LX-300+ is a 9-pin serial impact dot matrix printer. The major features Paper guide cover of this printer are as follows: Paper guide Printing speed: High speed draft 300 cps at 10 cpi...

  • Page 10: Printing Specification

    LX-300+ Revision A 1.2 Printing Specification Table 1-1. Print Speed and Printable Columns Character pitch Printable Printing speed Printing mode (cpi) columns (cps) 1.2.1 Printing Specification Print method: Impact dot matrix Number of pins: 9 pins Print pin arrangement: Print pin diameter: 0.29 mm (0.0114 inch) Color (Option): Black, Magenta, Cyan, Yellow...
  • Page 11 EPSON Draft 10cpi, 12cpi, 15cpi PC866 (Russian) EPSON Roman 10cpi, 12cpi, 15cpi, Proportional PC869 (Greek) MAZOWIA (Poland) EPSON Sans serif 10cpi, 12cpi, 15cpi, Proportional Code MJK (CSFR) ISO 8859-7 (Latin / Greek) EPSON OCR-B 10cpi ISO Latin 1T (Turkish) Bulgaria (Bulgarian)
  • Page 12 EPSON Draft Character table Bitmap font version PC 437(US, Standard Europe) EPSON Roman Standard Italic table EPSON Draft EPSON Sans serif version PC 437 (US, Standard Europe) EPSON Roman EPSON OCR-B EPSON Sans serif PC 860(Portuguese) PC 850 (Multilingual) EPSON Draft...

  • Page 13: Paper Feeding

    LX-300+ Revision A 1.2.2 Paper Feeding Table 1-4. Release Lever Lever position Paper path/ Feeder Paper/ Media Feeding method: Friction feed (rear) Push tractor feed (rear) Tractor Push tractor feed (rear) Continuous paper (Single Push and Pull tractor feed (rear) sheet and Multi part) Pull tractor feed (rear, bottom) Push and Pull tractor feed...

  • Page 14: Electrical Specification

    LX-300+ Revision A 1.2.3 Electrical Specification 1.2.4 Environmental Condition 120 V version Temperature: 5 to 35 C (operating ° 15 to 25 C (operating ° Rated voltage: AC 120V -30 to 60 ° C (non-operating) Input voltage range: AC 99 to 132 V Humidity: 10 to 80% RH (operating Rated frequency range: 50 to 60 Hz...

  • Page 15: Safety Approvals

    LX-300+ Revision A Yellow 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...

  • Page 16: Printable Area

    LX-300+ Revision A 1.2.10 Printable Area Table 1-6. Printable Area for Cut Sheet Cut sheets Single Sheet Multi Part PW (Width) Refer to 1.7 "Paper Refer to 1.7 "Paper Specifications" Specifications" PL (Length) Refer to 1.7 "Paper Refer to 1.7 "Paper Specifications"...
  • Page 17 LX-300+ Revision A Envelop Continuous paper 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" PW (Width) Refer to 1.7 "Paper Specifications"...
  • Page 18 LX-300+ Revision A Roll paper 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)

  • Page 19: Interface Specifications

    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...
  • Page 20 LX-300+ Revision A Table 1-12. Connector Pin Assignment and Signals BUSY signal is active (HIGH level) under the conditions below: In the process of receiving data Return Signal In/Out Functional Description Name In the condition of being input buffer full In the condition of being -INT signal active (low level) DATA7 bit6...

  • Page 21: Parallel Interface (Reverse Channel)

    PtrBusy/ Printer busy signal and reverse Table 1-13. DataBit-3,7 channel transfer data bit 3 or 7. [00H][4EH] Acknowledge data request signal MFG: EPSON; AckDataReq/ and reverse channel transfer data CMD: ESCPL2,PRPXL24,BDC,D4; DataBit-2,6 bit 2 or 6. MDL: LX-300+; CLS: PRINTER;...

  • Page 22: Serial Interface

    LX-300+ Revision A Table 1-15. Connector Pin Assignment and Signals Connector: 25 pin subminiature D-shell connector (female) Return Table 1-16. Connector Pin Assignment and Signals Signal Name In/Out Functional Description Signal Name In/Out Functional Description This line is pulled up tp +5V through 1.0 kΩ...

  • Page 23: Interface Selection

    LX-300+ Revision A 1.3.4 Interface Selection Auto: Communication is carried out in the conventional mode until a magic The printer has 2 interfaces; the parallel interface and serial interface. These string (1284.4 synchronous commands) is received. By receiving a interfaces are selected manually by Default Setting or selected automatically. magic string, communication in IEEE1284.4 packet mode is started.

  • Page 24: Operation

    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. Switch Function -Alternates printing and non-printing status.

  • Page 25: Led

    LX-300+ Revision A Operation in default setting mode *3 Font (Green) The following switches are used in default setting mode; -The status of Font selection is displayed by 2 Font LEDs when continuous paper is out of the Tear-off position. Table 1-19.

  • Page 26: Functions

    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 non- Default setting printing.
  • Page 27 LX-300+ Revision A Table 1-21. Setting Menu 3. Press Tear Off button. The current setting and the “Usage of this mode” by selected language Item Setting / Value *2 will be printed on the paper set in the paper path at that time. A print sample is shown in appendix A.

  • Page 28: Bi-D. Adjustment

    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 Paper out error: follows. When the printer fails to feed a sheet, it goes a paper out error. Release lever error: 1.

  • Page 29: Control Codes

    LX-300+ Revision A 1.5 Control codes Table 1-22. ESC/P2 Classification Operation Command 1.5.1 ESC/P2 Font enhancement Double-Width ESC W, DC4, SO Condensed DC2, SI Table 1-22. ESC/P2 Double-height ESC w Classification Operation Command Double-Strike ESC G, ESC H General Operation Initialize Printer ESC@ Super-/ Subscript...

  • Page 30: Ibm 2390 Plus Emulation

    LX-300+ Revision A 1.5.2 IBM 2390 Plus Emulation Table 1-23. IBM 2390 Plus emulation Classification Operation Command Table 1-23. IBM 2390 Plus emulation Font selection Pitch DC 2, ESC P, ESC: Classification Operation Command Bold Font ESC E, ESC F General Operation NUL, DC3 Master Select...

  • Page 31: Bi-Directional Commands

    The printer sends the following ID string in reply to this command. Table 1-25. Bi-Directional Commands Table 1-24. Function Code/ Parameter Save @EJL[SP]ID[CR][LF] Enter Remote-1 ESC”(R”08H 00H 00H “REMOTE1” MFG: EPSON; Exit Remote-1 ESC 00H 00H 00H CMD: ESCPL2,PRPXL24,BDC; MDL: LX-300+; Save settings “SV” 00H 00H CLS: PRINTER; Initialize “RS”...
  • Page 32 LX-300+ Revision A Table 1-28. NLSP only Table 1-26. Note for Table 1-25 Character table Character table m1 set by AT/CT m2 set by AT m3 set by AT PC866 UKR PC 708 PC869 PC720 All parameters that can be set PCAR_864 ISO 8859-2 *4 m2 and m3 apply to the following ID number.

  • Page 33: Reply Printer Status

    LX-300+ Revision A Table 1-29. Bi-Directional Commands 1.5.3.1 Reply Printer Status Function Code/ Parameter Save The printer sends back one of the five strings shown below according to the printer status at that time every few seconds. Select control language “PM”...

  • Page 34: Packet Commands

    LX-300+ Revision A 1.5.3.2 Packet commands Paper_path Table 1-32. Paper_Path Table 1-34. Packet Commands paper_path “<paper_path code>” Function Code Continuous paper (rear) “0000” Device ID request “di” 01H 00H 01H Continuous paper (bottom) “0001” Device ID reply (*1) “@EJL” SP “ID” CR LF <Device ID string> FF Cut sheet (rear) “0200”...

  • Page 35: Initialization

    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).

  • Page 36: Paper Specifications

    LX-300+ Revision A 1.7 Paper Specifications Cut sheet (multi part) Table 1-36. Cut Sheet (Multi part) Cut sheet (single sheet, not multi part) Minimum Maximum Table 1-35. Cut Sheet (single sheet, not multi part) (10.1) (inch) (3.9) Width Manual insertion CSF single-bin (mm) (257)
  • Page 37 LX-300+ Revision A Envelope Continuous paper (Single sheet and Multipart) Table 1-37. Envelope Table 1-38. Continuous Paper (Single sheet and Multi Part) Minimum Maximum Rear Entry Bottom Entry (inch) (6.5) Min. Max. Min. Max. Width (mm) Envelop (10) (10) (inch) Width (No.
  • Page 38 LX-300+ Revision A Labels 63.5 mm (2.5 inch) min. Table 1-39. Continuous Paper with Labels Rear Entry Bottom Entry 23.8 mm Label Min. Max. Min. Max. (15/16inch) min. Label size See the figure below. R_2.5 mm (0.1 inch) min. (10) (inch) Base sheet width (mm)

  • Page 39: Physical Specifications

    LX-300+ Revision A 1.8 Physical Specifications Physical Specifications (CSF) Dimensions: 366 x 441 x 370 mm (WxDxH) Physical Specifications (Without pull tractor) Mass: Approx. 4.6 kg Dimensions: 366 x 275 x 159 mm (WxDxH) Appearance: See the figure below. Mass: Approx.

  • Page 40: Accessories

    LX-300+ Revision A 1.9 Accessories Table 1-41. Enclosed Parts Enclosed Items Quantity User's manual Driver disk Ribbon cartridge (Black) Power supply cable (230 V Version) Table 1-42. Expendables Enclosed Items Description Ribbon cartridge (Black) #8750 Ribbon pack (Black) #8758 Ribbon cartridge (Color) S015073 Table 1-43.

  • Page 41: Chapter 2 Operating Principles

    C H A P T E R OPERATING PRINCIPLES...

  • Page 42: Overview

    EPSON LX-300+ Revision A 2.1 Overview LX-300+ consists of the printer mechanism and electric circuit boards. Printer Power Supply Mechanism Main Board M-M310 Board C294MAIN C294PSB/PSE Panel Board C294PNL Figure 2-1. Component Unit Printer mechanism: M-3M10 Circuit board Main (control circuit):...

  • Page 43: Printer Mechanism (M-3M10)

    EPSON LX-300+ Revision A 2.2 Printer Mechanism (M-3M10) Platen gap adjustment mechanism Adjust lever, Platen gap detector The following is main components of the LX-300+ printer mechanism. Paper feed mechanism PF motor, rear paper end (RPE)detector, bottom paper end (BPE)

  • Page 44: Printhead

    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 φ0.29 mm Diameter of wire See the figure below. Wire configuration Note: The figure is seen from the back of the head facing printing side.

  • Page 45: Carriage Mechanism

    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.
  • Page 46 EPSON LX-300+ Revision A The following table shows the various carriage speed modes. Table 2-4. Carriage Speed Mode Current limit (A/phase) Adjacent Carriage High or Carriage CR drive Phase Head drive Printing speed mode speed frequency drive frequency Printing speed...

  • Page 47: High Speed Skip Method

    EPSON LX-300+ Revision A 2.2.3 Ribbon Mechanism CARRIAGE HOME POSITION (HP) DETECTOR 2.2.3.1 Ink Ribbon Shifting Mechanism The table below is the HP detector specifications. Ink ribbon shifting mechanism: CR motor drives timing belt and the timing Table 2-5. HP detector Specifications belt driven pulley drives the ribbon shifting gears.
  • Page 48 EPSON LX-300+ Revision A Color ribbon drive circuit RIBBON CARTRIDGE DETECTOR Ribbon detector detects if the color ribbon is installed or not. Detect Timing Ribbon detector When the power is applied. When recovering from the economy mode. When the printing is started.

  • Page 49: Platen Gap Adjustment Mechanism

    EPSON LX-300+ Revision A COLOR MECHANISM INITIALIZATION PLATEN GAP (PG_SW) DETECTOR The printer mechanism initializes when the power is applied or when The following is PG_SW specification. recovering from the energy saving mode. Table 2-9. PG_SW Detector Specifications Color mechanism initialization...

  • Page 50: Paper Feed Mechanism

    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, LX-300+ uses the stepping motor for PF motor. Open loop control switches platen, rear paper end detector, bottom paper end detector and push tractor the phase according to the unit.

  • Page 51: Page Length Measurement

    EPSON LX-300+ Revision A 2.2.5.1 Page Length Measurement RPE DETECTOR Page length measurement is a process to convert the following value to the RPE detector is installed on the paper path at the back of the printer. The table number of printing lines.

  • Page 52: Release Mechanism

    EPSON LX-300+ Revision A 2.2.6 Release Mechanism 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.

  • Page 53: Electric Circuit Operating Principles

    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. Figure 2-7. MAIN Board Block Diagram Operating Principles Electric Circuit Operating Principles...

  • Page 54: C294Psb / C294Pse Board

    EPSON LX-300+ Revision A 2.3.2 C294PSB / C294PSE Board Table 2-14. Main Elements Elements Location Function LX-300+ generates power supply by 2 power supply boards: C294PSB (100V) RISC C33208 CPU, QFP 128 pin and C294PSE (200V). The table below shows the power supply boards input •...
  • Page 55 C H A P T E R TROUBLESHOOTING...

  • Page 56: Overview

    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 Never touch printhead and any motors right after printing since they are highly heated. Check performance by When disassembling the printer, be sure to disconnect the self-check function.

  • Page 57: Troubleshooting

    EPSON LX-300+ Revision A 3.2 Troubleshooting 3.2.2 Check Performance By Self-Check Function LX-300+ has self-check function and it supervises the printer condition 3.2.1 Initialization Check constantly. If any problem occurs, it indicates error by indicator LED and in some cases it notifies error to the operator by beeping the buzzer. Identify Before troubleshooting, check the following basic items.

  • Page 58: Identify Problems From Symptoms

    EPSON LX-300+ Revision A 3.2.3 Identify Problems From Symptoms Release Lever Error This error will be indicated when wrong release lever operation is This section procedure to identify the problems from the abnormal performed. For example, if you change the release lever setting when symptoms.
  • Page 59 EPSON LX-300+ Revision A Table 3-3. Control Panel LED Does Not Light On. Table 3-4. Printer Mechanism Does Not Operate. Cause Check Point Solution Cause Check Point Solution Check the electric circuit and Any of CN3 to Blowout of a fuse Is a fuse on the printer mechanism.
  • Page 60 EPSON LX-300+ Revision A Table 3-6. Self Test Print is Abnormal. Table 3-7. Paper Feed is Abnormal. Cause Check Point Solution Cause Check Point Solution Any of CN3 to RPE detector or Replace the sensor. Are all CN12 is not...

  • Page 61: Unit And Parts Check

    EPSON LX-300+ Revision A 3.2.4 Unit and Parts Check Table 3-9. Printing Operation is Abnormal When it is On-Line. (Self-Test is Normal.) This section describes the checking method of the printhead, motors and Cause Check Point Solution sensors to find the defective units and parts.

  • Page 62: Motor Check

    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 When the sensor is connected mechanically, you can check the sensor by its the motor is all right.

  • Page 63: Printhead Driver Check

    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 Operation Specification 1. Set the multimeter to the resistance measuring range.

  • Page 64: Chapter 4 Disassembly And Assembly

    C H A P T E R DISASSEMBLY AND ASSEMBLY...

  • Page 65: Overview

    EPSON LX-300+ Revision A 4.1 Overview Table 4-1. Recommended Tools Tools Part No. This chapter explains the disassembly and assembly of LX-300+. Needle-nose pliers B740400100 4.1.1 Precautions Nipper B740500100 Tweezers B741000100 Read the precautions below before disassembling and assembling the printer.

  • Page 66: Service Checks After Repair

    EPSON LX-300+ Revision A 4.1.3 Service Checks After Repair Table 4-3. Check List for Repaired Printer Category Component Item to Check Check Before returning the printer back to the user, use the check list below to Is the platen gap adjusted confirm the quality of the repaired printer.

  • Page 67: Disassembly And Assembly

    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 START otherwise specified, assembly can be done in the reverse order of the disassembly procedure.

  • Page 68: Printhead Removal

    EPSON LX-300+ Revision A 4.2.1 Printhead Removal Printhead 1. Remove the cover and the printer. CPB (3x14) 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.

  • Page 69: Upper Housing Removal

    EPSON LX-300+ Revision A 4.2.2 Upper Housing Removal When installing the upper housing, be sure to insert 1. Remove platen knob, cover assembly, printer, tractor unit and paper eject LEDs on the panel board to the LED holes of the upper unit.

  • Page 70: Printer Mechanism Removal

    EPSON LX-300+ Revision A 4.2.3 Printer Mechanism Removal Printer Mechanism Main Board Assembly 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.

  • Page 71: Board Assembly And Panel Removal

    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.

  • Page 72: P/S Board Assembly Removal

    EPSON LX-300+ Revision A 4.2.6 P/S Board Assembly Removal CP (M3x6) Lower Shield Plate Hexagon Nut 1. Remove the upper housing. (See 4.2.2 "Upper Housing Removal".) CBP (3x10) 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.

  • Page 73: Printer Mechanism Disassembly

    EPSON LX-300+ Revision A 4.2.7 Printer Mechanism Disassembly 4.2.7.1 CR Motor Assembly Removal 1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism This section explains the disassembling procedure of the printer mechanism. Removal".) The disassembling procedure is shown in the flowchart below.

  • Page 74: Platen Removal

    EPSON LX-300+ Revision A 4.2.7.2 Platen Removal Bushing, 11 1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Platen Removal".) 2. Remove the platen grounding wire from the platen. Gear, 34 3. Release 1 hook at the rotating hole of the combination gear 17.5, 27 and remove the gear from the right frame.

  • Page 75: Carriage Unit Removal

    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".) CR guide shaft 2. Remove the printhead. (See 4.2.1 "Printhead Removal".) Carriage unit 3. Remove the timing belt from the carriage installation point.

  • Page 76: Ribbon Feed Mechanism Removal

    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.

  • Page 77: Rpe Sensor Removal

    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 1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) Removal".) 2. Remove the hook of the RPE sensor installed at the paper guide.

  • Page 78: Pg Sensor Removal

    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 1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) Removal".) 2. Release 2 hooks of the PG sensor securing it to the left frame with 2.

  • Page 79: Pf Motor Assembly Removal

    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 1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) Removal".) 2. Remove the platen grounding wire from the platen.
  • Page 80 EPSON LX-300+ Revision A 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 Combination gear, 8.5, 25.2 Gear, 27.5 Figure4-22. Paper Feed Mechanism Disassembly...

  • Page 81: Paper Guide Removal

    EPSON LX-300+ Revision A 4.2.7.12 Paper Guide Removal 8. Release 1 hook at the left frame securing the base frame and remove it by pulling it to the rear. 1. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) 2. Remove the platen. (See 4.2.7.2 "Platen Removal".) Base frame 3.

  • Page 82: Chapter 5 Adjustment

    C H A P T E R ADJUSTMENT...

  • Page 83: Overview

    EPSON LX-300+ Revision A 5.1 Overview START This chapter explains the adjustment required after disassembling the printer. 5.1.1 Platen Gap Adjustment Move the carriage unit to the left end. Platen gap adjustment is required at the following cases. Printhead is replaced.

  • Page 84: Bi-D Adjustment

    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.
  • Page 85 EPSON LX-300+ Revision A 7. The program will ask you the production line No. Ignore it and press 9. The destination setting menu appears. Perform settings accordingly. ENTER. The current destination settings are as follows. Table 5-3. Destination Setting List (TBD) ↑...
  • Page 86 EPSON LX-300+ Revision A ↑ ↓ ← → 11. When you select the destination, select menu below appears. You can 13. “Main MENU” appears. Use key or key to shift “>” mark select from inspection within the production line (In line) or inspection for to the left of “(1) Bi-D Adjust”...
  • Page 87 EPSON LX-300+ Revision A 15. Input the printing mode and the settings you want to use and input Table 5-4. Bi-D Rated Setting ENTER (Write) to confirm it. Press space key and the following printing Printing Mode Value “A” pattern will be printed.
  • Page 88 C H A P T E R MAINTENANCE...

  • Page 89: Maintenance

    17.5, 27 of the right frame. grease have a great affect on the performance of the product, especially on Touching position of the grounding platen the durability and the performance at the lower temperature. EPSON G-26 1 grain of rice spring with platen shaft.
  • Page 90 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 at 3 places on 3 Lubricate G-26 on the shaft of the RD shafts at the right frame.
  • Page 91 EPSON LX-300+ Revision A Lubricate G-26 to the shaft of the drive PF roller and the rear driven Lubricate G-26 into the hole of the Drive PF roller PF roller. (4 places) right TR (tractor) frame facing to the TR guide shaft and the left TR PF roller assembly: frame.
  • Page 92 EPSON LX-300+ Revision A Move the carriage around the Lubricate G-26 on the installing center, then lubricate G-26 on the shaft of the Combination Gear, touching parts of the 2 sides of 17.5, 27 of the right frame. the frame.

  • Page 93: Chapter 7 Appendix

    C H A P T E R APPENDIX...

  • Page 94: Connector Summary

    EPSON LX-300+ Revision A 7.1 Connector Summary Table 7-1. C294MAIN Board Connector Summary Connector Function Pins The figure below illustrates how the primary components are connected. Parallel I/F Serial I/F HP Detector PE (Rear) Sensor Release Detector PE (bottom) Detector...
  • Page 95 EPSON LX-300+ Revision A Table 7-4. Connector Pin Assignments - CN5 Table 7-8. Connector Pin Assignments - CN9 Signal Name Function Signal Name Function RELEASE Release sensor signal Head data 7 Signal ground Head data 8 Head data 9 Table 7-5. Connector Pin Assignments - CN6...
  • Page 96 EPSON LX-300+ Revision A Table 7-12. Connector Pin Assignments - CN13 Table 7-10. Connector Pin Assignments - CN11 Signal Name Function Signal Name Function LED1 LED1 Paper feed motor phase A Switch 1 Paper feed motor phase A Signal ground...

  • Page 97: Parts List

    EPSON LX-300+ Revision A 7.2 Parts List Table 7-13. Parts List Number Parts Name The following table shows parts name of this product. Refer to the exploded "C.B.B-TITE(P(13)),3X14,F/ZN" diagrams for parts’ number. C.B.(O) SCREW 4X8 F/ZG Table 7-13. Parts List C.P.SCREW...
  • Page 98 EPSON LX-300+ Revision A Table 7-13. Parts List Table 7-13. Parts List Number Parts Name Number Parts Name "PULLEY ASSY.,DRIVEN" "BUSHING,PARALLEL,ADJUST" "HARNESS,HP" "CABLE,HEAD" C.P.B SCREW "HARNESS,PG" PAPER GUIDE "PAPER GUIDE,LOWER" "DETECTOR,PE,REAR" "SPURGEAR,17" "HARNESS,PE,REAR" PAPERSUPPORT "DETECTOR,PE,BOTTOM" "FRAME,TR,RIGHT" "HARNESS,PE,BOTTOM" "FRAME,TR,LEFT" "HOLDER,ROLLER,PF" "TRACTOR,LEFT"...
  • Page 99 EPSON LX-300+ Revision A Table 7-13. Parts List Number Parts Name "COMBINATION GEAR,17.5,27" "GROUNDING PLATE,CS" "GROUNDING WIRE,LEFT" "GROUNDING WIRE,RIGHT" "GROUNDING PLATE,PF" "SHEET,PROTECT,CABLE" "SHEET,PROTECT,M/B" "SHEET,CABLE,CR" "C.B.P-TITE,3X10,F/ZN" C.B.S. SCREW "LEVER,RELEASE" "PRINT HEAD,D3910-1" "LABEL,WARNING" Appendix Parts List...

  • Page 100: Exploded Diagrams

    EPSON LX-300+ Revision A 7.3 Exploded Diagrams L-300 No.01 Rev.01 10202 Figure 7-2. Exploded Diagram 1 Appendix Exploded Diagrams...
  • Page 101 EPSON LX-300+ Revision A L-300 No.02 Rev.01 10202 Figure 7-3. Exploded Diagram 2 Appendix Exploded Diagrams...

  • Page 102: Component Layout

    EPSON LX-300+ Revision A 7.4 Component Layout Appendix Component Layout...

  • Page 103: Circuit Schematics

    EPSON LX-300+ Revision A 7.5 Circuit Schematics The following pages show circuit schematics below. C294MAIN Board C294PSB Board C294PSE Board Appendix Circuit Schematics...

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