Epson LQ-300 + Service Manual
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Epson LQ-300 + Service Manual

24 pins serial impact dot matrix printer
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SERVICE MANUAL

24 Pins Serial Impact Dot Matrix Printer
LQ - 300 + / LQ-305K
®
SEDM00006

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Summary of Contents for Epson LQ-300 +

  • Page 1: Service Manual

    SERVICE MANUAL 24 Pins Serial Impact Dot Matrix Printer LQ - 300 + / LQ-305K ® SEDM00006...
  • Page 2 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.
  • Page 3 REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN. 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: About This Manual

    Provides preventive maintenance procedures and the related to a specific subject, or comment on the results achieved through a previous action. lists of Epson-approved lubricants and adhesives required for servicing the product. I.ndicates an operating or maintenance procedure, practice APPENDIX...
  • Page 5 Revision Status Revision Issued Date Description January 25, 2001 First Release 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. February 15, 2001 •...

  • Page 6: Table Of Contents

    Contents Chapter 1 Product Description 1.6 Initialization ..................22 1.7 PAPER ....................23 1.1 Features ....................4 1.7.1 PAPER SPECIFICATIONS ............23 1.7.2 Printable Area ................26 1.2 SPECIFICATIONS ................5 1.2.1 Physical Specification ..............5 1.8 Accessories ..................28 1.2.2 Printing Specification ..............
  • Page 7 Chapter 5 Adjustment 3.1 Overview ................... 45 3.2 Troubleshooting ................46 5.1 Overview ..................72 3.2.1 Initialization Check ..............46 5.1.1 Platen Gap Adjustment ............. 72 3.2.2 Check Performance By Self-Check Function ......46 5.1.2 Bi-D Adjustment ................ 73 3.2.2.1 Indicator LEDs ..............46 3.2.3 Identify Problems From Symptoms ...........

  • Page 8: Chapter 1 Product Description

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

  • Page 9: Features

    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. The major features of Micro Adjust, Self test, Data dump this printer are as follows:...

  • Page 10: Specifications

    EPSON LQ-300+ Revision C 1.2 SPECIFICATIONS With CSF (Single bin CSF) Dimensions: 366 x 441 x 370 mm (WxDxH) 1.2.1 Physical Specification Mass: Approx. 4.6 kg Appearance: See the figure below. Without Pull Tractor Dimensions: 366 x 275 x 159 mm (WxDxH) Mass: Approx.

  • Page 11: Printing Specification

    EPSON LQ-300+ Revision C 1.2.2 Printing Specification Resolution: Print method: Impact dot matrix Horizontal density Vertical density Printing mode Adjacent dot print Number of pins: 24 pins (dpi) (dpi) Print pin arrangement: 12 x 2 staggered High speed draft Print pin diameter: 0.29 mm (0.0114 inch)
  • Page 12 10cpi, 12cpi, 15cpi PC852 (East Europe) PC857 (Turkish) EPSON Roman 10cpi, 12cpi, 15cpi, Proportional PC864 (Arabic) PC866 (Russian) EPSON Sans serif 10cpi, 12cpi, 15cpi, Proportional PC869 (Greek) MAZOWIA (Poland) EPSON Courier 10cpi, 12cpi, 15cpi Code MJK (CSFR) ISO 8859-7 (Latin / Greek)
  • Page 13 EPSON Courier Europe) EPSON Sans Serif EPSON Roman T PC 857 (Turkish) EPSON Prestige PC 850 (Multilingual) EPSON Courier EPSON Sans Serif H PC 866 (Russian) EPSON Script PC 860 (Portuguese) EPSON Prestige PC 869 (Greek) PC 863(Canadian- EPSON Script...

  • Page 14: Paper Feeding

    EPSON LQ-300+ Revision C 1.2.3 Paper Feeding Lever position Paper path/ Feeder Paper/ Media Feeding method: Friction feed (rear) Tractor Push tractor feed (rear) Continuous paper (Single sheet & Push tractor feed (rear) Multi part) Push and Pull tractor feed (rear) Push and Pull tractor feed (rear) Continuous paper (Single sheet &...

  • Page 15: Electrical Specification

    EPSON LQ-300+ Revision C 1.2.4 Electrical Specification 1.2.5 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...

  • Page 16: Safety Approvals

    EPSON LQ-300+ Revision C Yellow approx. 0.5 million characters (Draft 10 cpi, 48 dots/character) Type: Film Color: Black Ribbon life: approx. 0.2 million characters (LQ 10 cpi, 48 dots/character) 1.2.8 Safety Approvals 120 V version Safety standards: UL1950 CSA C22.2 No. 950...

  • Page 17: Interface

    EPSON LQ-300+ Revision C 1.3 INTERFACE 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 IEEE-1284 compatibility mode Adaptable connector: 57-30360 (Amphenol) or equivalent...
  • Page 18 EPSON LQ-300+ Revision C BUSY signal is active (HIGH level) under the conditions below: Table 1-1. Connector Pin Assignment and Signals In the process of receiving data Return Signal Pin No. In/Out Functional Description In the condition of being input buffer full...

  • Page 19: Parallel Interface (Reverse Channel)

    EPSON LQ-300+ Revision C 1.3.2 Parallel Interface (Reverse Channel) Return Transmission mode: IEEE-1284 nibble mode Pin No. Signal Name In/Out Functional Description Adaptable connector: See 1.3.1 "Parallel Interface (Forward Channel)" HostClk Host clock signal. Synchronization: Refer to the IEEE-1284 specification Parallel input data to the printer.

  • Page 20: Serial Interface

    EPSON LQ-300+ Revision C Return Pin No. Signal Name In/Out Functional Description Signal Name In/Out Functional Description Transmit data. Chassis Chassis GND. Indicates that the printer is ready to receive data or not. 16, 33, Signal GND. 19-30 Connected directly to the DTR signal.

  • Page 21: Interface Selection

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

  • Page 22: Operator Controls

    EPSON LQ-300+ Revision C 1.4 OPERATOR CONTROLS 1.4.1.1 Switches Operation in normal mode In normal mode, pressing panel switches executes the following functions. 1.4.1 Operation Switches 4 switches and 5 LEDs are on the panel as shown below. Switch Function -Alternates printing and non-printing status.

  • Page 23: Led

    EPSON LQ-300+ Revision C Operation in default setting mode -All LEDs blink when continuous paper is in the Tear-off position. The following switches are used in default setting mode as follows; : Tear off : Draft : Draft Condensed Switch...

  • Page 24: Panel Functions

    EPSON LQ-300+ Revision C 1.4.2 Panel Functions Default setting Starts the default setting mode. See 1.4.2.3 "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 Pause numbers and corresponding characters.
  • Page 25 EPSON LQ-300+ Revision C Select setting value with the LF/FF button. Item Setting / Value *2 Tear Off/ Bin LEDs and Paper Out LED show that the menu’s value by status of Packet mode Auto, OFF On/Off/Blink/2-Blinks. That value can be changed by pressing the Tear Off/ Bin...

  • Page 26: Bi-D. Adjustment

    EPSON LQ-300+ Revision C 1.4.3 Errors 1.4.2.4 Bi-d. Adjustment Bi-d. adjustment can be performed by users. Bi-d. adjustment method is as follows. Paper out error: When the printer fails to feed a sheet, it goes a paper out error. Turning the printer on while pressing the Pause switch. The guide to adjust Bi-d Release lever error: alignment in this mode and the first alignment pattern will be printed.

  • Page 27: Control Codes

    EPSON LQ-300+ Revision C 1.5 Control codes Control codes = ESC/P2 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.

  • Page 28: Paper

    EPSON LQ-300+ Revision C 1.7 PAPER Cut sheet (multi part) Table 1-3. Cut Sheet (Multi Part) 1.7.1 PAPER SPECIFICATIONS Minimum Maximum Cut sheet (single sheet, not multi part) (10.1) (inch) (3.9) Width (mm) (257) Table 1-2. Cut Sheet (Single) (14.3) (inch) (3.9)
  • Page 29 EPSON LQ-300+ Revision C Envelope Continuous paper (Single sheet and Multipart) Table 1-4. Envelope Table 1-5. Continuous Paper (Single Sheet & Multi Part) Minimum Maximum Rear Entry Bottom Entry (inch) (6.5) Width Min. Max. Min. Max. (mm) Envelop (No. 6)
  • Page 30 EPSON LQ-300+ Revision C Labels 63.5 mm (2.5 inch) min. Table 1-6. 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.

  • Page 31: Printable Area

    EPSON LQ-300+ Revision C 1.7.2 Printable Area Table 1-8. Printable Area for Cut Sheets Cut sheets Single Sheet Multi Part PW (Width) Refer to 1.7.1 "PAPER Refer to 1.7.1 "PAPER SPECIFICATIONS" SPECIFICATIONS" PL (Length) Refer to 1.7.1 "PAPER Refer to 1.7.1 "PAPER SPECIFICATIONS"...
  • Page 32 EPSON LQ-300+ Revision C Envelop Continuous paper P e r f o r a t i o n P r i n t a b l e A r e a P r i n t a b l e A r e a P e r f o r a t i o n Figure 1-8.

  • Page 33: Accessories

    C80030* Roll paper holder #8310 Figure 1-10. Printable Area for Roll Paper Color upgrade kit C83211* Epson Net 10/100 Base TX Ext. Print Server C82378* Table 1-11. Printable Area-Roll Paper Continuous Paper PW (Width) Refer to 1.7.1 "PAPER SPECIFICATIONS" PL (Length) Refer to 1.7.1 "PAPER SPECIFICATIONS"...

  • Page 34: Difference Between Lq-300+ And Lq-305K

    EPSON LQ-300+ Revision C 1.9 Difference between LQ-300+ and LQ-305K The LQ-300+ and the LQ-305K are only differnet in the following points, and all other components are remained the same. EEPROM setting Model ID setting is different. New function: “Condensed Print Mode” is added Selectable from the control panel (Enable/Disable) “Condensed Print Mode”...

  • Page 35: Chapter 2 Operating Principles

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

  • Page 36: Overview

    EPSON LQ-300+ Revision C 2.1 Overview LQ-300+ consists of the printer mechanism and electric circuit boards. Printer Mechanism Power Supply Main Board Board C395MAIN C294PSB/PSE Panel Board C294PNL Figure 2-1. Component Unit Circuit board Main (control circuit): C395MAIN Board Power:...

  • Page 37: Printer Mechanism

    EPSON LQ-300+ Revision C 2.2 Printer Mechanism Ribbon mechanism Color ribbon drive mechanism (option) The following is main components of the LQ-300+ printer mechanism. Platen gap adjustment mechanism Adjust lever, Platen gap detector Printhead Paper feed mechanism Carriage mechanism PF motor, rear paper end (RPE)detector, bottom paper end (BPE) detector...

  • Page 38: Printhead

    EPSON LQ-300+ Revision C 2.2.1 Printhead The table below shows the printhead specifications. Table 2-1. Printhead Specifications Item Specification Number of wires φ0.20 mm Diameter of wire See the figure below. Head Center Wire configuration Note: The figure is seen from the back of the head facing printing side.

  • Page 39: Carriage Mechanism

    EPSON LQ-300+ Revision C 2.2.2 Carriage Mechanism The following is the components of the LQ-300+ carriage mechanism and its explanation. (Refer to Figure 2-2.) 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.
  • Page 40 EPSON LQ-300+ Revision C The following table shows the various carriage speed modes. Table 2-4. Carriage Speed Mode Current limit (A/phase) Adjacent Carriag CR drive Phase Head drive Carriage speed High or Printing e speed frequency drive frequency Printing speed...

  • Page 41: High Speed Skip Method

    EPSON LQ-300+ Revision C 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 belt driven Table 2-5. HP detector Specifications pulley drives the ribbon shifting gears.
  • Page 42 EPSON LQ-300+ Revision C 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 43: Platen Gap Adjustment Mechanism

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

  • Page 44: Paper Feed Mechanism

    EPSON LQ-300+ Revision C 2.2.5 Paper Feed Mechanism PF MOTOR This mechanism consists of paper feed motor (PF motor), paper feed gears, platen, rear LQ-300+ uses stepping motor for PF motor. Open loop control switches the phases paper end detector, bottom paper end detector and push tractor unit. (Refer to Figure according to the setting period and this mechanism loads and carries paper to the 2-2.)

  • Page 45: Page Length Measurement

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

  • Page 46: Release Mechanism

    EPSON LQ-300+ Revision C 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 47: Electric Circuit Operating Principles

    EPSON LQ-300+ Revision C 2.3 Electric Circuit Operating Principles 2.3.1 C395MAIN Board Figure 2-7. C395 MAIN Block Diagram Operating Principles Electric Circuit Operating Principles...

  • Page 48: C294Psb / C294Pse Board

    EPSON LQ-300+ Revision C Table 2-14. Main ICs and Functions Table 2-14. Main ICs and Functions Elements Location Function BA033FP Elements Location Function Regulator IC IC11 • Generates 3.3V logic voltage E01A17Axx TL594CN • 95V rated voltage circuit • Outside clock 19.66 MHz/...
  • Page 49 C H A P T E R TROUBLESHOOTING...

  • Page 50: Overview

    EPSON LQ-300+ Revision C 3.1 Overview Troubleshooting This chapter describes how to troubleshoot problems when any problems occurred to the printer. Refer to troubleshooting flowcharts in this chapter to identify a defective part and an appropreate repair for it. Initialization...

  • Page 51: Troubleshooting

    EPSON LQ-300+ Revision C 3.2 Troubleshooting Table 3-1. Indicator LEDs Printer Condition Pause Paper Out Front Buzzer MICRO Adjust BLINK 3.2.1 Initialization Check According to Tear Off LED On/Off Before troubleshooting, check the following basic items. combination When a printer can perform printing, perform self-test and check if any troubles According to occur.

  • Page 52: Identify Problems From Symptoms

    EPSON LQ-300+ Revision C 3.2.3 Identify Problems From Symptoms Table 3-3. Control Panel LED Does Not Light On. Cause Check Point Solution This section contains procedures to identify problems from abnormal symptoms. Check the electric circuit and Repair/replacement is usually performed as a unit, however, parts level replacement...
  • Page 53 EPSON LQ-300+ Revision C Table 3-6. Self Test Print is Abnormal. Table 3-5. When Power is Applied, the Printer Becomes Fatal Error. Cause Check Point Solution Cause Check Point Solution Ribbon mechanism is Is ribbon advanced CR motor harness is Is CR motor harness Replace the ribbon mechanism parts.

  • Page 54: Unit And Parts Check

    EPSON LQ-300+ Revision C 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 sensors to find Cause Check Point Solution the defective units and parts.

  • Page 55: Printhead Check

    EPSON LQ-300+ Revision C 3.2.4.1 Printhead Check By measuring the direct current resistance of the printhead coil, you can check if it is all right. Table 3-10. Printhead Coil Resistance Item Operation Specification 1. Set the multimeter to the resistance measuring range.

  • Page 56: Motor Check

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

  • Page 57: Printhead Driver Check

    EPSON LQ-300+ Revision C 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 58: Chapter 4 Disassembly And Assembly

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

  • Page 59: Overview

    EPSON LQ-300+ Revision C 4.1 Overview 4.1.2 Tools The table below lists the tools recommended to use for disassembly and assembly and This chapter explains the disassembly and assembly of LQ-300+. adjustment. Use only tools specified here. Table 4-1. Recommended Tools-1 4.1.1 Precautions...

  • Page 60: Service Checks After Repair

    EPSON LQ-300+ Revision C 4.1.3 Service Checks After Repair Category Component Item to Check Check Ink ribbon Is ribbon removed? Before returning the printer back to the user, use the check list below to confirm the Transportation Are all the relevant parts included in quality of the repaired printer.

  • Page 61: Disassembly And Assembly

    EPSON LQ-300+ Revision C 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 START otherwise specified, assembly can be done in the reverse order of the disassembly procedure.

  • Page 62: Printhead Removal

    EPSON LQ-300+ Revision C 4.2.1 Printhead Removal Printhead CBP (3x14) Remove the cover and the printer. Remove 1 screw (CBP, 3x14, Torque:0.59-0.78N.M) securing the printhead to the carriage assembly. Carriage Assembly Lift the printhead a little bit. Unlatch 2 hooks securing the printhead FFC to carriage unit.

  • Page 63: Upper Housing Removal

    EPSON LQ-300+ Revision C 4.2.2 Upper Housing Removal When installing the upper housing, be sure to insert LEDs Remove platen knob, cover assembly, printer, tractor unit and paper eject unit. C H E C K P O I N T on the panel board to the LED holes of the upper housing.

  • Page 64: Printer Mechanism Removal

    EPSON LQ-300+ Revision C 4.2.3 Printer Mechanism Removal Printer Mechanism Main Board Assembly Remove the upper housing. (See 4.2.2 "Upper Housing Removal".) 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.

  • Page 65: Board Assembly And Panel Removal

    EPSON LQ-300+ Revision C 4.2.4 Board Assembly and Panel Removal 4.2.5 C395 MAIN Board Assembly Removal Remove the upper housing. (See 4.2.2 "Upper Housing Removal".) Remove the upper housing. (See 4.2.2 "Upper Housing Removal".) Remove the panel FFC from the connector of panel board assembly.

  • Page 66: C294Psb/Pse Board Assembly Removal

    EPSON LQ-300+ Revision C 4.2.6 C294PSB/PSE Board Assembly Removal Lower Shield Plate Hexagon Nut CP (3x4) Remove the upper housing. (See 4.2.2 "Upper Housing Removal".) Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) Remove the power cable (CN1) connecting to the Power Supply board assembly.

  • Page 67: Printer Mechanism Disassembly

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

  • Page 68: Platen Removal

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

  • Page 69: Carriage Unit Removal

    EPSON LQ-300+ Revision C 4.2.7.3 Carriage Unit Removal PG adjust lever Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) Remove the printhead. (See 4.2.1 "Printhead Removal".) CR guide shaft Remove the timing belt from the carriage installation point. Carriage unit...

  • Page 70: Ribbon Feed Mechanism Removal

    EPSON LQ-300+ Revision C 4.2.7.4 Ribbon Feed Mechanism Removal Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) 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".) Release 3 hooks securing the RD cover to the left frame.

  • Page 71: Rpe Sensor Removal

    EPSON LQ-300+ Revision C 4.2.7.5 RPE Sensor Removal 4.2.7.7 HP Sensor Removal Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) Remove the hook of the RPE sensor installed at the paper guide.

  • Page 72: Pg Sensor Removal

    EPSON LQ-300+ Revision C 4.2.7.8 PG Sensor Removal Remove the harness from the sensor (blue). Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) Release lever position sensor (blue) Release 2 hooks of the PG sensor securing it to the left frame with tweezers and remove the sensor.

  • Page 73: Pf Motor Assembly Removal

    EPSON LQ-300+ Revision C 4.2.7.10 PF Motor Assembly Removal 4.2.7.11 Paper Feed Mechanism Disassembly Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) Remove the platen grounding wire from the platen.
  • Page 74 EPSON LQ-300+ Revision C 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 Figure 4-22. Paper Feed Mechanism Disassembly...

  • Page 75: Paper Guide Removal

    EPSON LQ-300+ Revision C 4.2.7.12 Paper Guide Removal Release 1 hook at the left frame securing the base frame and remove it by pulling it to the rear. Remove the printer mechanism. (See 4.2.3 "Printer Mechanism Removal".) Remove the platen. (See 4.2.7.2 "Platen Removal".) Remove the carriage unit.

  • Page 76: Chapter 5 Adjustment

    C H A P T E R ADJUSTMENT...

  • Page 77: Overview

    EPSON LQ-300+ Revision C 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 78: Bi-D Adjustment

    EPSON LQ-300+ Revision C 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 caution items below, and then, perform the steps for the platen gap adjustment.
  • Page 79 EPSON LQ-300+ Revision C The destination setting menu appears. Referring to the table below and using ↑ ↓ key to shift the“>” mark,choose an appropriate setting and press ENTER. Table 5-3. Destination Setting Destination Setting EUR NLSP NLSP EUL NLSP (220V)
  • Page 80 EPSON LQ-300+ Revision C Table 5-3. Destination Setting Destination Setting USASTD USASTD ECC(Kver) DEFSTD 10. The following screen appears. By using ↑ ↓ key to shift “>” mark, select “Out Going” and press ENTER. 12. The printing mode select menu for Bi-D adjustment appears. Use ↑...
  • Page 81 EPSON LQ-300+ Revision C 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.
  • Page 82 C H A P T E R MAINTENANCE...

  • Page 83: Maintenance

    1 grain of rice with platen shaft. on performance of the product, especially on the durability and the performance at the 6-12 lower temperature. EPSON determines what kind of and how much of oil to be applied Spur gear 34 G-26 10mm based on various information and analysis.
  • Page 84 EPSON LQ-300+ Revision C Lubricate G-26 on the 3 shafts and 1 boss Lubrication Points of the left frame. G-26, 1/2 of rice Lubricate G-26 at 3 places on 3 shafts at Lubricate G-26 on the shaft of the left the right frame.
  • Page 85 EPSON LQ-300+ Revision C Lubricate G-26 to the shaft of the drive PF roller and the rear driven PF Lubricate G-26 into the hole of the Drive PF roller roller. (4 places) right TR (tractor) frame facing to the TR guide shaft and the left TR frame.
  • Page 86 EPSON LQ-300+ Revision C Move the carriage around the center, Lubricate G-26 on the installing shaft then lubricate G-26 on the touching of the Combination Gear, 17.5, 27 of parts of the 2 sides of the frame. the right frame.

  • Page 87: Chapter 7 Appendix

    C H A P T E R APPENDIX...

  • Page 88: Connector Summary

    EPSON LQ-300+ Revision C 7.1 Connector Summary Table 7-1. C395Main Connectors 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 PG (Copy Mode) Detector...
  • Page 89 EPSON LQ-300+ Revision C Table 7-4. CN5-Release Sensor Table 7-8. CN9-Head Signal Name Function Signal Name Function RELEASE Release sensor signal Head data 6 Signal ground HD14 Head data 14 HD10 Head data 10 Table 7-5. CN6-PE (Bottom) Sensor HD23...
  • Page 90 EPSON LQ-300+ Revision C Table 7-12. CN13-Operation Panel C294PNL Table 7-10. CN11-PF Motor Signal Name Function Signal Name Function LED1 LED1 Paper feed motor phase A Switch 1 Paper feed motor phase A Signal ground Paper feed motor phase B...
  • Page 91 EPSON LQ-300+ Revision C Table 7-13. CN16-Head Signal Name Function HD13 Head data 13 Head data 1 Head data 5 Appendix Connector Summary...

  • Page 92: Parts List

    EPSON LQ-300+ Revision C 7.2 Parts List Table 7-14. LQ-300+ Parts List Code Part Name The following table shows parts name of this product. Refer to the exploded diagrams C.P.SCREW for parts’ number. C.B.S. SCREW GUIDE,STACKER Table 7-14. LQ-300+ Parts List BOARD ASSY.,MAIN...
  • Page 93 EPSON LQ-300+ Revision C Table 7-14. LQ-300+ Parts List Table 7-14. LQ-300+ Parts List Code Part Name Code Part Name PULLEY ASSY.,DRIVEN HARNESS,PG HARNESS,HP PAPER GUIDE,LOWER C.P.B SCREW CABLE,HEAD,FRONT MOTOR ASSY.,PF CABLE,HEAD,REAR PAPER GUIDE DAMPER DETECTOR,PE,REAR FRAME,BASE HARNESS,PE,REAR PAPER GUIDE,SUPPORT...
  • Page 94 EPSON LQ-300+ Revision C Table 7-14. LQ-300+ Parts List Code Part Name LEVER,RELEASE SHEET,CABLE,CR PRINTHEAD,DH24-0U0 LABEL,WARNING Appendix Parts List...

  • Page 95: Exploded Diagrams

    EPSON LQ-300+ Revision C 7.3 Exploded Diagrams Exploded diagrams of LQ-300+ are shown on the following pages. Appendix Exploded Diagrams...
  • Page 96 (320) LQ-300+ No.01 Rev.01 10302...
  • Page 97 LQ-300+ No.02 Rev.01 10302...

  • Page 98: Component Layout

    EPSON LQ-300+ Revision C 7.4 Component Layout C395MAIN BOARD -MOUNTED SIDE This section provides component layouts. Figure 7-2. Component Layout-C395MAIN (Mounted Side) Appendix Component Layout...
  • Page 99 EPSON LQ-300+ Revision C C395MAIN BOARD-SOLDERED SIDE Figure 7-3. Component Layout-C395MAIN (Soldered Side) Appendix Component Layout...
  • Page 100 EPSON LQ-300+ Revision C C294PSB BOARD C294PSE BOARD Figure 7-4. Component Layout-C294PSB Figure 7-5. Component Layout-C294PSE Appendix Component Layout...
  • Page 101 EPSON LQ-300+ Revision C C294PNL BOARD Figure 7-6. Component Layout-C294PNL Appendix Component Layout...

  • Page 102: Electric Circuit Schematics

    EPSON LQ-300+ Revision C 7.5 Electric Circuit Schematics The following pages show circuit schematics below. C395MAIN Board C294PSB Board C294PSE Board C294PNL Board Appendix Electric Circuit Schematics...

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