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Epson LQ-1070 Service Manual

Terminal printer
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EPSON TERMINAL PRINTER
4000566
REV.-B
.

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Summary of Contents for Epson LQ-1070

  • Page 1 EPSON TERMINAL PRINTER LG1-570/lo7cJ 4000566 REV.-B...
  • Page 2 ‘ All efforts 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. ‘ The above notwithstanding SEIKO EPSON can assume no responsibility for any errors in this manual or the consequences thereof.
  • Page 3 THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS. WARNING REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN. MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE.
  • Page 4 Includes a step-by-step guide for adjustment. C h a p t e r 4 - C h a p t e r 5 - Provides Epson-approved techniques for troubleshooting. C h a p t e r 6 - Describes preventive maintenance techniques and lists lubricants and adhesives required to service the equipment.
  • Page 5 REVISION SHEET REVISON DATE ISSUED C H A N G E D O C U M E N T June 20, 1991 1st issue Sept. 6, 1991 Added information for the LQ-1 070: l-i, l-ii, 1-1 - 1-8, 1-10, 1-11, 1-24, 1-26 - 1-28 2-i, 2-ii, 2-1 - 2 - 1 1 , 2 - 1 3 - 2-15, 2-17, 2-18 3-i, 3-ii, 3-5 - 3-20 4-i, 4-1 - 4-4, 4-6...

  • Page 6: Table Of Contents

    REV.-A TABLE OF CONTENTS GENERAL DESCRIPTION CHAPTER 1. OPERATION PRINCIPLES CHAPTER 2. DISASSEMBLY AND ASSEMBLY CHAPTER 3. ADJUSTMENTS CHAPTER 4. TROUBLESHOOTING CHAPTER 5. MAINTENANCE CHAPTER 6. APPENDIX vi -...

  • Page 7: General Description

    REV.-B CHAPTER 1 GENERAL DESCRIPTION FEATURES ....................S P E C I F I C A T I O N S .
  • Page 8 REV.-B LIST OF FIGURES Figure 1-1. Exterior View of the LQ-570/1070 ....... . . 1-2 Configuration .

  • Page 9: Features

    Two ways to insert cut sheets (front/top) Auto loading The LQ-570/l 070 are equipped with the standard EPSON 8-bit parallel interface. Various interface options ensure compatibility with a wide variety of computers. Table 1-1 lists the interface options, Table 1-2 lists the optional units available for the LQ-570/l 070, and Figure 1-1 shows an exterior view of the LQ-570/l 070.

  • Page 10: Figure 1-1. Exterior View Of The Lq-570/1070

    REV.-B Table 1-2. Optional Units Description Model Single-bin cut-sheet feeder (80-column) C80637* High-capacity cut-sheet feeder (80-column) C80638* C80639* SingI-bin sheet feeder (1 36-column) High capacity cut sheet feeder (1 36-column) C80640* C80019* Tractor unit (80-column) Tractor unit (1 36-column) C80022* Fabric ribbon cartridge (80-column) 7753 Fabric ribbon cartridge (1 36-column)

  • Page 11: Specifications

    REV.-B 1.2 SPECIFICATIONS This section provides specifications for the LQ-570/l 070 printer. 1.2.1 Hardware Specifications Printing method Serial, impact, dot matrix 24 wires (12 X 2 staggered, diameter 0.2 mm) Pin configuration Wires 1 Wires - - - - - - ’ $ j+-------- +L____ !!’’0’”...
  • Page 12 REV.-B Use the paper tension unit. Do not use multi-part cut-sheet forms, except with front insertion. Do not perform reverse feeds greater than 1/6 inch when using envelopes. 2. Push tractor feed (release lever in REAR PUSH POSITION). Paper must be loaded from the rear entrance. Release the friction-feed mechanism.

  • Page 13: Specifications For Cut Sheets

    REV.-B Table 1-4. Specifications for Cut Sheets (Carbonless Duplicating Paper) Width 182 mm to 216 (’364) mm (7.2 in. to 8.5 (* 14.3) in.) Length 257 mm to 297 mm (10.1 in. to 11.7 in.) Thickness 0.065 mm to 0.14 mm (0.0025 in. to 0.0055 in.) - single sheet 0.12 mm to 0.32 mm (0.0047 in.

  • Page 14: Printable Area For Cut Sheets

    REV.-B Printable area See figures 1-3, 1-4, and 1-5 - 257 mm (5.8 - 10. 1“) top insertion 148 148 - 257 (x 420) mm (5.8 - 10. 1“ {x 16.5)) - 257 mm (7.2 - 10 1“) f r o n t i n s e r t i o n 1 8 2 - 257 (* 364) mm (7.2 - 10.
  • Page 15 REV.-B (80-column): 1) 13 mm (0.51 in.) or more when a paper width of 101 mm (4 in.) to 241 mm (9.5 in.) is used. 24 mm (0.9 in.)(rear insertion)\ 26 mm (1.0 in.)(front/bottom insertion) or more when a paper width of 254 mm (10 in.) is used.
  • Page 16 REV.-B 220 to 240 VAC 220 to 240 V version Rated voltage Input voltage range 198 to 264 VAC Rated frequency 50 to 60 Hz Input frequency 49.5 to 60.5 Hz Rated current 1.0 A Approx. 33 W (during a self-test Power consumption in draft mode, 10 cpi) Insulation resistance...

  • Page 17: Firmware Specifications

    EPSON Draft 8 pt to 32 pt EPSON Roman Scalable fonts EPSON Saris Serif 8 pt to 32 pt Selection and mixture of the following modes are allowed, excluding 15 cpi Printing modes condensed mode: O Print quality (draft/letter quality)

  • Page 18: Table 1-8. Printing (Text Mode)

    REV.-B NOTES: High-speed draft is valid if the printer status is as follows: High-speed draft is selected by DIP switch. Emphasized character mode is not selected. Condensed character mode is not selected. Draft is selected. No D/L (download) characters are sent to the printer, The horizontal dot space of characters is not set.

  • Page 19: Table 1-9. Printing (Bit Image Mode)

    REV.-B Table 1-9. Printing (Bit Image Mode) } P r i n t a b l e D o t s I D e n s i t y (dpi) I Printing Speed (ips) Pins I Bit Image Printing Mode 480 (*8 16) 21.0 Single-density...

  • Page 20: Table 1-10. Character Matrix And Character Size

    REV.-A Table 1-10. Character Matrix and Character Size Printing Mode HDD I C h a r a c t e r S i z e I Unit ESC sp Face Matrix — High-speed draft, 10 pitch 7 x 22 2.0 x 3.1 Draft, 10 pitch 9 x 22 1.9 x 3.1...

  • Page 21: Figure 1-5. Character Matrix

    REV.-A (Typical LQ character) (Typical draft character) Ascender area Ascender area Descender area Descender area Face width Face width < > < dots 29 dots (Typical LQ, excluding 15 pitch) 15 dots for 15 pitch and condensed La Character width (CW) 12 dots (10 CPI) 120 DPI 15 dots (12 CPI) 180 DPI 16 dots (15 CPI) 240 DPI...

  • Page 22: Interface Overview

    REV.-A 1.3 INTERFACE OVERVIEW The printer has a parallel interface with the specifications described below. 1.3.1 Parallel Interface Specifications for the 8-bit parallel interface are as follows: Data format 8-bit parallel STROBE signal Synchronization BUSY and ACKNLG signal Handshaking Signal level TTL-compatible Adaptable connector 57-30360 (Amphenol)
  • Page 23 Table 1-11. Connector Pin Assignments and Signal Functions (Cont.) Return Pin No. Signal Name Functional Description Dir. Pin No. — AUTO FEED-XT If LOW when the printer is initialized, the printer automatically performs a line feed upon input of the CR code (Auto LF).

  • Page 24: Control Panel

    REV.-A 1.4 CONTROL PANEL On the control panel are: a power button (labeled OPERATE), 7 non-lock type buttons, and 19 indicators. Figure 1-7. Control Panel B U T T O N S (1) OPERATE Button This button turns on the power supply to the printer. (2) PAUSE Button This button controls printer action.
  • Page 25 REV.-A (7) FONT Button Pressing this button selects a font, and pressing it continuously selects the next one, sequentially. The FONT LED indicates the currently selected font. (8) CONDENSED Button Pressing this button toggles the printing mode between normal and condensed, alternatively. are stored as defaults, so that the last FONT NOTE: Selections of the FONT and CONDENSED buttons when the printer is initialized.

  • Page 26: Dip Switch Settings

    REV.-A 1.5 DIP SWITCHES AND JUMPER SETTING This section describes the DIP switch selections and jumper setting for the LQ-570 printer. DIP Switch Settings 1.5.1 The two DIP switch banks for the printer, located on control panel, function as shown in tables 1-12 through 1-15.

  • Page 27: Table 1-14. International Character Set Selection

    REV.-A Table 1-14. International Character Set Selection Country U s . France Germany U.K. Denmark 1 Sweden (437) (437) Italy Spain 1 (437) When SW 1-4 is OFF, — If graphic table was selected by ESC t 1, PC becomes 437. When SW 1-4 is ON, if italic table was selected by ESC t O, country setting becomes U.S.

  • Page 28: Operating Instructions

    REV.-A 1.6 OPERATING INSTRUCTIONS This section describes the self-test and hexadecimal dump functions and also includes the error states, printer initialization, and buzzer operation. 1.6.1 Self-Test To run the self-test using draft mode, turn the printer on while pressing the LOAD/EJECT button. To run the self-test using the letter quality (LQ) mode, turn the printer on while pressing the LINE FEED\FORM FEED button.

  • Page 29: Paper-Out Detection And Forms Override Function

    REV.-A Paper-out Detection and Forms Override Function 1.6.3 When the paper-out detector, attached to the printer mechanism, detects a paper-end, the printer first performs a forms override. If paper loading fails, the BUSY signal goes HIGH, the PAPER OUT indicator is lit, the interface PE signal becomes HIGH, the ERROR signal becomes LOW, and the printer enters the PAUSE condition automatically.

  • Page 30: Default Values

    REV.-A (a) Initializes printer mechanism. (b) Clears input data buffer. (c) Clears downloaded character set. (d) Clears print buffer. (e) Returns printer settings to their default values. (2) Software initialization Input of the ESC @ command also initializes the printer. Printer initialization by ESC @ code does not perform functions (a), (b), and (c) above.

  • Page 31: Tear-Off Function

    REV.-A Automatic cut-sheet loading and ejection with cut-sheet feeder Move the release lever to the friction-feed position, and place the sheets into the hopper of the cut-sheet feeder. Pressing the LOAD/EJECT button loads one sheet to the top-of-form position. If a paper-out is detected before printing starts, a sheet will again be loaded automatically to the top-of-form position.

  • Page 32: Lever Positions

    REV.-B Short-tear-off To access the short-tear-off function, press the TEAR-OFF button. The release lever must be in the tractor position. The paper advances to the tear-off position whether the printer is in PAUSE or RUNNING condition. At this time, the TEAR-OFF LED lights to indicate that you can use the LOAD/EJECT and LINE FEED/FORM FEED buttons, in conjunction with the ALT button, for backward and forward micro feed adjustment.

  • Page 33: Printer Protection For Heavy-Duty Printing

    REV.-A for Heavy -Duty Pr i nti n g 1.6.11 Printer Protection This printer has a printhead protection function to prevent it from overheating and to protect the printer when the head driver voltage drops. If head temperature exceeds its maximum value, printing stops automatically until the head temperature drops to a certain value before printing resumes.

  • Page 34: Main Components

    REV.-B 1.7 MAIN COMPONENTS for easy removal and replacement The main components of the LQ-570/l 070 printers are designed to maintain and repair the printer. The main components are: the main control board; the CPU on this board controls all main functions. 1) C062 MAIN board: the control panel board.

  • Page 35: C062 Pnl Board (Control Panel Circuit Board)

    REV.-B C062 PNL Board (Control Panel Circuit Board) 1.7.2 The C062 PNL board is the LQ-570\1070 control panel, which includes the indicator LEDs, switches, I and DIP switches. Figure 1-13. C062 PNL Board 1.7.3 C062 PSB/PSE Board (Power Supply Circuit Board) The power supply unit consists of a switching regulator circuit, which converts the AC line voltage to the DC voltages (for example, +35V and + 5V) used by the printer.

  • Page 36: Printer Mechanism (M-5 E10/M-5E60)

    REV.-B 1 . 7 . 4 P r i n t e r M e c h a n i s m ( M - 5 E10/M-5E60) The M-5E 10/M-5E60 printer mechanism was developed specifically for use with LQ-570/l 070 printer. The components include a carriage motor, carriage mechanism, paper-feed motor, paper-feed mechanism, ribbon-feed mechanism, printhead, and sensors.

  • Page 37: Operation Principles

    REV.-B CHAPTER 2 OPERATION PRINCIPLES OVERVIEW OF PRINTER MECHANISM OPERATION ....2-1 2.1.1 Printhead M e c h a n i s m ............. . 2-1 carriage 2.1.2 Movement Mechanism .
  • Page 38 REV.-B Figure 2-12. Paper Path for Bottom Entrance Pull Tractor Feed... 2-8 Figure 2-13. Paper Path for Front Entrance Friction Feed....2-9 Figure 2-14. Paper Path for Front Entrance Pull Tractor Feed..2-9 Figure 2-15.

  • Page 39: Overview Of Printer Mechanism Operation

    REV.-B 2.1 OVERVIEW OF PRINTER MECHANISM OPERATION This section describes the PRINTER MECHANISM of the Model-5E 10\5E60 printer unit and explains how the printer works. The Model-5E 10/5E60 has a PRINTER MECHANISM that features a 24-pin impact dot printhead for serial printing. There are four main parts to the printer mechanism: 1) the printhead mechanism, 2) the carriage movement mechanism, 3) the paper advance mechanism, and 4) the ribbon advance mechanism.

  • Page 40: Carriage Movement Mechanism

    REV.-B 2.1.2 Carriage Movement Mechanism A timing belt is connected to the carriage on the lower side. With the printhead installed, this carriage moves in either direction along the SHAFT, CR, GUIDE. The carriage is driven by the MOTOR, CR a stepping motor that drives the TIMING BELT via the BELT PULLEY.

  • Page 41: Paper Feed Mechanism

    REV.-B 2.1.3 Paper Feed Mechanism Cut sheet paper is advanced by friction feed. Continuous form paper is advanced using a tractor feed mechanism. There are three ways to advance the paper with tractor feed: using the push tractor, using the pull tractor, and using the push and pull tractors together.
  • Page 42 REV.-B Push Tractor Method When the push tractor is selected, the SPUR GEAR, 16 engages the SPUR GEAR, 17 (Tractor gear) on the TRACTOR ASSY. COMBINATION GEAR, 8.5, 30 is driven by the paper-feed gear, which in turn is driven by the paper-feed motor pinion gear. The paper-feed pinion gear, when turning in the direction of the black arrow, results in pushing the paper through the mechanism.
  • Page 43 REV.-B Pull Tractor Method Using pull tractor feed to advance the paper is basically the same as using push tractor feed. In push tractor feed, the TRACTOR ASSY. (paper advance mechanism) is before the paper entrance. It pushes MECHANISM. the paper through the PRINTER Puil tractor feed, however, has the opPosite arran9ementl with the tractor situated after the paper entrance.

  • Page 44: Paper Insertion Entrances

    REV.-B The LEVER, RELEASE switches between friction feed and tractor feed. Setting the LEVER, RELEASE to the friction feed position presses the paper advance roller against the PLATEN. Setting the release lever to the tractor feed position releases this pressure, so that the paper advance roller separates from the PLATEN.
  • Page 45 REV.-B Rear entrance paper insertion the paper can When you feed paper into the printer through the rear entrance, the method to advance the paper has be: the push tractor, or the push-pull tractor. The rear paper-out detector senses when run out.
  • Page 46 REV.-B Bottom entrance paper insertion When you feed paper into the printer through the bottom entrance, the pull tractor advances the paper. The front paper-out detector senses when the paper runs out. Paper (Continuous) M“?.’?.TRACT”RA’S’” PF Drive Roller ““’C’”R’’’YPEFR”NTWP “aper’ e ea”o”er / From Bottom Insertion Figure 2-12.
  • Page 47 REV.-B Front entrance paper insertion When you feed paper into the printer through the front entrance, the paper can be advanced either with friction feed or the pull tractor. The front paper-out detector senses when the paper runs out. Paper (Cut sheet) Printhead EJECT ROLLER ASSY., PAPER...

  • Page 48: Ribbon Advance Mechanism

    REV.-B 2 . 1 . 4 R i b b o n A d v a n c e M e c h a n i s m The ribbon drive gear advances the ribbon through a gear linkage. This arrangement of gears makes the ribbon drive gear always rotate in a counterclockwise direction, regardless of the direction the carriage is moving.

  • Page 49: Power Supply Operation

    REV.-B 2.2 POWER SUPPLY OPERATION The printer can be powered by either of two power supply boards: the 120 V C062 PSB board or the 220/240 V C062 PSE board. The only difference in the way these two boards operate is in the primary circuitry.

  • Page 50: Power Supply Board

    REV.-A Second, there are four circuits to protect the supply circuitry and avoid danger. The +5 VDC line contains a current overload protection circuit and a voltage overload protection circuit. The current overload protection circuit is part of the + 5 VDC supply circuit. It cuts the + 5 VDC line if the current is too great.

  • Page 51: C062 Main Board

    REV.-B 2.3 CONTROL CIRCUIT OPERATION The control circuit consists of two boards: the C062 MAIN board, which acts as the main board, and the C062 PNL board, which acts as the control panel board. This section describes how these boards work.
  • Page 52 REV.-B Table 2-5 lists the functions of the main components and circuits of the printer. The CPU converts the print data sent from the host computer to image data (the print image). The image data is then loaded to RAM. Each line of data is processed sequentially. The CPU transfers the print data to the printhead drive circuit.

  • Page 53: Reset Circuit

    REV.-B Table 2-5. Functions of the Main IC and Circuits (Cont.) Functions IC or Circuit Location This is a chip that houses drive circuits for the printhead, MOTOR,CR STK-6022B single and MOTOR, PF of the PRINTER MECHANISM. The chip also includes the various sensor input circuits for the PRINTER MECHANISM.

  • Page 54: Sensor Circuits

    REV.-A Power On CPU Self Reset +5 V Line - Vmml Figure 2-20. RESET Signal Timing 2.3.3 Sensor Circuits Figure 2-21 shows the sensor circuits in block diagram form. Detection of any excessive printhead temperature causes the TEMP2 signal to be sent directly to the CPU. Other signals, such as the CRHOME signal, pass through the STK-6022B unit before reaching the CPU.

  • Page 55: Motor, Cr Drive Circuit

    REV.-B 2.3.4 MOTOR, CR Drive Circuit Figure 2-22 shows the MOTOR, CR drive circuit. An open-loop, constant-current drive arrangement is used for running the MOTOR, CR. The motor is driven by 2-2 phase excitation and 1-2 phase excitation. 2-2 phase excitation corresponds to two 1-2 phase excitation steps. Thus, for each single step phase change of a phase excitation motor, the carriage moves 1/1 20 inch.

  • Page 56: Motor, Pf Drive Circuit

    REV.-B 2 . 3 . 5 M O T O R , P F D r i v e C i r c u i t The printer uses a stepping motor to advance the paper. The minimum amount of paper that can be advanced is 1/360 inch.

  • Page 57: Printhead Drive Circuit

    REV.-A 2.3.6 Printhead Drive Circuit Figure 2-24 shows the printhead drive circuit in block diagram form. The print data already has been expanded to create the image data. The CPU splits up this data three times and transfers this information to the latch circuit within the STK-6022B.
  • Page 58 REV.-A 2 . 3 . 6 Printhead D r i v e C i r c u i t Figure 2-24 shows the printhead drive circuit in block diagram form. The print data already has been expanded to create the image data. The CPU splits up this data three times and transfers this information to the latch circuit within the STK-6022B.

  • Page 59: Disassembly And Assembly

    REV.-B CHAPTER 3 DISASSEMBLY AND ASSEMBLY 3.1 OVERVIEW ....................3.1.1 Precautions for Disassembling the Printer .
  • Page 60 REV.-B LIST OF FIGURES Disassembling the Printer ..... . 3-4 Figure 3-1. Flowchart for Removing the Printer Cover and Figure 3-2. the Paper Eject Cover .

  • Page 61: Overview

    REV.-A 3.1 OVERVIEW note when disassembling and assembling the printer. This section describes the various points to 3.1.1 Precautions for Disassembling the Printer Follow the precautions below when disassembling the printer. W A R N I N G Before disassembling, assembling, or adjusting the printer, disconnect the power supply cable from the external AC power socket.

  • Page 62: Service Checks After Repair

    REV.-A 3.1.3 Service Checks After Repair When printer components are to be sent back to the customer after servicing, first use the checklist shown in Table 3-3 to note the current state of the components. This checklist provides a record to make servicing and shipping more efficient.

  • Page 63: Specifications For Screws

    REV.-A 3.1.4 Specifications for Screws In the following sections, abbreviations are used for small parts, such as screws and washers. Tables 3-4 and 3-5 list these abbreviations. Table 3-4. Abbreviations Used for Screws Part Neme Abbreviation CBS(C) Cross-recessed Bind head Cone point S tight screw CBB(C) Cross-recessed Bind head Cone point B tight screw Cross-recessed Bind head screw...

  • Page 64: Disassembly And Assembly

    REV.-A 3.2 DISASSEMBLY AND ASSEMBLY This section describes the procedures for disassembling and assembling the main components of the printer. When the procedure for installing a component into the printer is simply the reverse of the procedure for removing the component, no description of how to install the component is given. Any points of special concern when assembling or adjusting a component part are given after the description of the procedure.

  • Page 65: Changing The Printhead

    REV.-B 3.2.1 Changing the Printhead 1. Remove the FRAME ASSY., SHEET GUIDE. 2. Remove the COVER ASSY., EJECT. HEET GUIDE ASSY., EJECT “(This illustration shows the LQ-570, an 80-column printer. The difference b e t w e e n t h e LQ-570 and the LQ- 1070 is only in carriage width.) Figure 3-2.

  • Page 66: Removing The Printer Case

    REV.-B Removing the Printer Case 3.2.2 This section describes how to remove the front case and HOUSING ASSY., UPPER. 3.2.2.1 Removing the HOUING, FRONT 1. Remove the COVER ASSY., PRINTER, FRONT. 2. Remove the HOUSING, FRONT. 3. Use a screwdriver to release the clips that hold the front case to the HOUSING ASSY., UPPER. Open the HOUSING, FRONT.

  • Page 67: Removing The Circuit Boards

    REV.-B Removing the Circuit Boards 3.2.3 This section describes how to remove the BOARD ASSY., MAIN (C062 MAIN board), the BOARD ASSY., POWER SUPPLY (C062 PSB/PSE board) and the BOARD ASSY., PANEL (C062 PNL board). 3.2.3.1 Removing the BOARD ASSY., MAIN (C062 MAIN Board) Remove the HOUSING ASSY.,UPPER (see Section 3.2.2.2).

  • Page 68: Removing The Board Assy., Power Supply

    REV.-B Point to Note for Assembly and Adjustment After replacing the BOARD ASSY., MAIN, you must adjust the bidirectional print position again to ensure bidirectional printing is correctly aligned (see Section 4.2). 3.2.3.2 Removing the BOARD ASSY., POWER SUPPLY (C062 PSB/PSE Board) 1.

  • Page 69: Removing The Printer Mechanism

    REV.-B 3.2.4 Removing the PRINTER MECHANISM 1. Remove the HOUSING ASSY., UPPER (see Section 3.2.2.2). 2. Remove the CB (M3X 6) screws that attach the HOLDING PLATE., FFC to the SHIELD PLATE, MAIN BOARD. Remove the HOLDING PLATE,FFC. 3. Disconnect the 2 FFCS(CABLE, HEAD, FRONT(,REAR))from the CN6 and CN7 connectors on the BORAD ASSY., MAIN.

  • Page 70: Disassembling The Printer Mechanism

    REV.-B 3 . 2 . 5 D i s a s s e m b l i n g t h e P R I N T E R M E C H A N I S M This section describes how to disassemble the main components of the PRINTER MECHANISM. 3.2.5.1 Removing the MOTOR, CR 1.

  • Page 71: Removing The Motor, Pf

    REV.-B 3.2.5.2 Removing the MOTOR, PF 1. Remove the PRINTER MECHANISM from the HOUSING ASSY., LOWER(see Section 3.2.4). 2. Remove the COMPRESSION SPRING, 200 that holds the platen shaft. PF to 3. Release the two clips holding the MOTOR, the FRAME, MAIN, RIGHT. 4.

  • Page 72: Removing The Carriage

    REV.-B 3.2.5.4 Removing the Carriage Remove the FFC (CABLE, HEAD, FRONT(,REAR)) (see Section 3.2.5.3). Remove the TIMING BELT from the carriage. Use the box driver to rotate and free the adjusting bushing. This bushing holds the SHAFT, CR, GUIDE to the FRAME, MAIN, RIGHT. Remove the bushing. Remove the carriage unit together with the SHAFT, CR, GUIDE by pulling the SHAFT, CR, GUIDE a little to the right.

  • Page 73: Removing The Platen

    REV.-B 3.2.5.5 Removing the PLATEN Remove the PRINTER MECHANISM from the HOUSING ASSY., LOWER (see Section 3.2.4). Remove the two CBP(C) (M3 X 10) screws that hold the COVER, PLATEN, LOWER to the left and FRAME, MAIN, RIGHT. Remove the COVER, PLATEN, LOWER. Remove the COMPRESSION SPRING, 200 that holds the platen shaft (see Section 3.2.5.2, step 2).
  • Page 74 REV.-B 3.2.5.6 Removing and Disassembling the FRAME, MAIN, RIGHT 1. Remove the PRINTER MECHANISM from the HOUSING ASSY., LOWER (see Section 3.2.4). Remove the PLATEN from the PRINTER MECHANISM (see Section 3.2.5.5). Remove the MOTOR, CR from the FRAME, MAIN, BASE (see Section 3.2.5. 1). Remove the two CBS(C)(P) (M3 X 10) screws that hold the FRAME, MAIN, RIGHT to the FRAME, MAIN, BASE.

  • Page 75: Removing And Disassembling The Paper Guide

    REV.-B 3.2.5.7 Removing and Disassembling the PAPER GUIDE (Including the DETECTOR ASSY., HP) Remove the PRINTER MECHANISM from the HOUSING ASSY., LOWER (see Section 3.2.4). 2. Remove the PLATEN from the PRINTER MECHANISM (see Section 3.2.5.5). 3. Remove the FRAME, MAIN, RIGHT from the FRAME, MAIN, BASE (see Section 3.2.5.6). 4.

  • Page 76: Lease)

    REV.-B 9. While holding down the three LEVER ASSY., PF, pull out and remove the SHAFT, RELEASE Remove the LEVER ASSY., PF and the COMPRESSION SPRING, 1300 from the PAPER GUIDE. 10. While holding open the clips that secure the DETECTOR ASSY., RELEASE to the PAPER GUIDE, remove the DETECTOR ASSY., RELEASE.

  • Page 77: Removing Th~ Detector Assy., Hp

    REV.-B 3.2.5.8 Removing the DETECTOR ASSY., HP 1. Remove the PRINTER MECHANISM from the HOUSING ASSY., LOWER (see Section 3,2.4). 2, Remove the clips from the rear side of the FRAME, MAIN, BASE that hold the ASSY., HP. DETECTOR ASSY., HP from the rear of the FRAME, MAIN, BASE. Remove the DETECTOR DETECTOR ASSY., Figure 3-23.

  • Page 78: Removing The Detector Assy., Pe, Front

    REV.-B 3.2.5.10 Removing the DETECTOR ASSY., PE, FRONT 1. Remove the PRINTER MECHANISM from the HOUSING ASSY., LOWER (see Section 3.2.4). 2. Open the clips that hold the DETECTOR ASSY., PE, FRONT to the FRAME, MAIN, BASE. Remove the DETECTOR ASSY., PE, FRONT. DETECTOR ASSY , Figure 3-25.

  • Page 79: Disassembling The Tractor Ashy

    REV.-B 3.2.5.12 Disassembling the TRACTOR ASSY. Remove the TRACTOR ASSY. from the printer. Remove the SPUR GEAR, 17 from the SHAFT, TRACTOR. Remove the FRAME, TRACTOR, RIGHT from the SHAFT, TRACTOR and the SHAFT, TRACTOR, GUIDE. Remove RETAINING RING from the SHAFT, TRACTOR. Remove the TRACTOR ASSEMBLY (RIGHT), the PAPER SUPPORT unit, and the TRACTOR ASSEMBLY [LEFT) from the SHAFT, TRACTOR and SHAFT, TRACTOR, GUIDE.

  • Page 80: Arranging The Cables

    REV.-B 3.2.5.13 Arranging the Cables I Figure 3-28 shows how the cables are arranged for the PRINTER MECHANISM. When assembling the printer, make sure that the cables are laid out as shown in this figure. PRINTER MECHANISM (Bottom) — — —...
  • Page 81 REV.-B CHAPTER 4 ADJUSTMENTS 4.1 ADJUSTING THE PRINTER MECHANISM ........4-1 4.1.1 MOTOR, CR Backlash Adjustment .

  • Page 82: Adjusting The Printer Mechanism

    REV.-B 4.1 ADJUSTING THE PRINTER MECHANISM This section describes the various adjustments you may need to make to the PRINTER MECHANISM. I 4.1.1 MOTOR, CR Backlash Adjustment smoothly with In the MOTOR, CR backlash adjustment, the pinion gear of the MOTOR, CR is meshed noisy, and the the BELT PULLEY cog.

  • Page 83: Platen Gap Adjustment

    REV.-B 4.1.2 Platen Gap Adjustment If you have rotated or reassembled the SHAFT, CR, GUIDE or the adjusting bushing, or if printing is abnormal, you must adjust the gap between the PLATEN and the printhead. Remove the PRINTER MECHANISM from the HOUSING ASSY., LOWER (see Section 3.2.4). Remove the printhead from the carriage (see Section 3.2.
  • Page 84 REV.-H for a thickness gauge of 0.44 Rotate the adjusting bushing until the platen gap is large enough mm thickness but too narrow for one of 0.47 mm thickness. 0.45 %1 L PLATEN Printhead Figure 4-4. Platen Gap Move the carriage until the edge of the printhead is at the 75th column print position. Use the box driver (7 mm) to rotate the adjusting bushing on the FRAME, MAIN, RIGHT of the PRINTER MECHANISM.

  • Page 85: Bidirectional Print Position Adjustment

    REV.-B 4.2 BIDIRECTIONAL PRINT POSITION ADJUSTMENT This section describes how to adjust the bidirectional print position to ensure correct printing alignment. 4.2.1 Overview of Bidirectional Print Position Adjustment This printer prints characters when the carriage is moving in either direction (i.e., from left to right or from right to left).
  • Page 86 REV.-A NO ~ GO TO STEp 30 Are the characters aligned vertically? YES ~ GO TO S 3. Referring the odd-numbered lines (Ist and 3rd), adjust the even-numbered lines (2nd and 4th). the right: “ If the even-numbered lines are shifted to pressing the ALT button.

  • Page 87: Circuit Adjustment

    REV.-B 4.3 CIRCUIT ADJUSTMENT I The BOARD ASSY., MAIN (C062 MAIN BOARD) contains variable resistor VR1, which is used for balancing the circuitry. When any of the following parts are replaced, the circuitry must be balanced again by adjusting this variable resistance: R14, RI 5, R13, C8, and VR 1 If the circuitry is not correctly balanced in this way, the CPU A\D converter fails to function normally and printer operation is affected.

  • Page 88: Troubleshooting

    REV.-B CHAPTER 5 TROUBLESHOOTING OVERVIEW ....................REPAIR BY UNIT REPLACEMENT .
  • Page 89 REV.-B 5.1 OVERVIEW symptoms, which can complicate the task of Problems in the printer may exhibit a variety of unless you follow the procedure shown in the flowchart below. troubleshooting, S T A R T 5 . 2 5 - 2 Repair by unit replacement 5 .

  • Page 90: Repair By Unit Replacement

    REV.-B 5.2 REPAIR BY UNIT REPLACEMENT For most problems, it is sufficient for you to determine the difficulty to the unit level. Refer to Table 5-3, identify what the problem is, then perform the checks according to the corresponding flowchart. Table 5-3.
  • Page 91 REV.-B (1) Printer Fails to Operate when Power is On S T A R T Use correct AC input voltage. Replace the fuSe and disconnect :~;:don the main is turned ON again, Measure the output voltage from the Power Supply board. <...
  • Page 92 REV.-B (2) Carriage Operation is Abnormal CN 12,CN8,CN9,CN 10, CN4,CN5,CN6, and CN7 connecting the BOARD ASSY., MAIN and the PRINTER MECHANISM inserted Secure connectors. Refer to section 5.5, Repair of the PRINTER MECHANISM. the fault corrected? Replace the BOARD ASSY., MAIN.
  • Page 93 REV.-B Printing is Faulty During Self-Test, but Carriage Operation is Normal S T A R T Set the head LEVER,G, ADJUST to the 2nd position, and perform and CN7 connecting the BOARD ASSY., MAIN and the PRINTER MECHANISM. > a n y ao~ mlsslngf Perform bidirectional printing adjustment.
  • Page 94 Check printhead r e s i s t a n c e . Replace pluggable chips. Replace printhead. Replace printhead and logic PCB. Replace logic PCB.
  • Page 95 Check printhead resistance again. Replace printhead Replace printhead. cable. Perform final t e s t .
  • Page 96 REV.-A # 2 0 # 4 0 # 6 0 # 8 0 o #11 Oqls # 240 Wire Assignment ) < Coil Resistance: 45.5 ~3.2 Q at 25°C (Between each dot wire and common.) TEMP2 # 2 0 tl12 # 2 4 @ @ @ Q/’@\g g &...
  • Page 97 (4) Paper Feeding is Abnormal (but Printing is Normal) S T A R T < Load the paper correctly. platen knob rotate manually with power Refer to seCtiOn 5.5, ‘T’ Repair of the PRINTER MECHANISM. Replace the BOARD ASSY., MAIN. Replace the BOARD ASSY., MAIN.
  • Page 98 REV.-A Replace defective Replace logic PCB. m oto r. NOTE < NOTE Check motor resistance. Perform final t e s t . Replace motor and 1/0 cable. NOTE Replace motor. NOTE Perform final test. NOTE: Perform bidirectional print alignment adjustment. 5-1o...
  • Page 99 Inspect gears for damage or debris. Clean or replace. Check left and right tractor < assembly for proper phasing. Adjust phasing or replace sprocket assembly. Inspect paper path. Reform final test. 5-11...
  • Page 100 REV.-B Control Panel Operation is Abnormal ASSY MAIN connected Reinsert connector CN3 correctly. k“ fault corrected? Replace the BOARD ASSY., MAIN. Replace the BOARD ASSY., PANEL. Replace the BOARD ASSY., Replace the BOARD ASSY., MAIN. PANEL. 5-12...
  • Page 101 (6) Printing of Data Sent by the Host Computer is Faulty NOTE: It is assumed here that the host computer is operating normally. Perform self-test printing. Refer to other troubleshooting items. Replace the BOARD ASSY., MAIN. 5-13...

  • Page 102: Repair Of The Main Board

    REV.-B 5.3 REPAIR OF THE MAIN BOARD ASSY., MAIN when is defective and This section provides instructions for repairing the BOARD proper waveforms, Checkpoints refer to describes various symptoms, likely causes, and checkpoints. resistance values, and other values to be checked to evaluate the operation of any component that might be bad.
  • Page 103 REV.-B Table 5-4. Repair of a Problem in the BOARD ASSY., MAIN (Cont.) Solution Checkpoint Cause Symptom Problem Replace IC5E Either ROM or rhe printer The CPU does or IC6E. RAM is not operate. ioes not op- defective. ?rate at all. If a signal is :heck the oscillator signal at either pin The CPU is...
  • Page 104 BOARD ASSY., MAIN (Cont.) Table 5-4. Repair of a Problem in the Problem Solution Symptom Cause Checkpoint Self-test print- VR 1. Self-test is The CPU can’t (pin 1) of Adjust Measure the voltage at Vref not executed. measure the IC 1 C. The normal voltage is 4.741 V. ing is abnormal.

  • Page 105: Repair Of The Printer Mechanism

    REV.-B 5.4 REPAIR OF THE PRINTER MECHANISM For detailed procedures for replacing or adjusting parts, refer to Chapter 3, Dkassemb/yandAssemb/y, and Chapter 4, If a problem or symptom recurs following an attempted repair, refer to Table Adjustment. 5-5 to try to find other potential causes. Table 5-5.

  • Page 106: Adjustments

    REV.-B Table 5-5. ReDair of the PRINTER MECHANISM (Cont.) Solution Problem Cause Checkpoint Symptom Measure the coil re- Replace the A particular dot The printhead is Self-test printing is printhead. fails to print. defective. sistance of the abnormal. printhead. The nor- mal value is ap- proximately 45.5 ohms.
  • Page 107 REV.-B Table 5-5. ReDair of the PRINTER MECHANISM (Cont.] —r Problem Symptom Cause Checkpoint Solution The ribbon feed is The ribbon is not The ribbon car- Dismount the rib- Replace the ribbon fed. bon cartridge, ro- cartridge. abnormal. tridge is defective. tate its knob manu- ally, and check whether the ribbon...

  • Page 108: Maintenance

    REV.-B CHAPTER 6 MAINTENANCE PREVENTIVE MAINTENANCE ............. 6-1 LUBRICATION AND ADHESIVE APPLICATION .

  • Page 109: Preventive Maintenance

    6.2 LUBRICATION AND ADHESIVE APPLICATION EPSON recommends that the printer be lubricated at the points illustrated in Figure 6-2. Table 6-2 lists each point together with its recommended lubricant. The three recommended lubricants are EPSON...
  • Page 110 REV.-A Table 6-2. Lubrication Points (Refer to Figure 6-2) Ref. No. Lubrication Points Lubricant G-26 1/4 of the perimeter of the top edge of the gear (8.5 mm, 30 mm) G-26 1/3 of the perimeter of the top edge of the gear (40 mm) 1/3 of the perimeter of the top edge of the platen gear G-26 Portion of carriage...
  • Page 111 REV.-A Figure 6-2. LQ-570 Lubrication Points...
  • Page 112 REV.-B...
  • Page 113 REV.-B APPENDIX CONNECTOR SUMMARY ..............A-1 CIRCUIT DIAGRAMS .
  • Page 114 REV.-B LIST OF TABLES Board Connector Summary ........... . A-2 Table A-1.
  • Page 115 REV.-B A.1 CONNECTOR SUMMARY Figure A-1 illustrates the interconnection of the primary components. Table A-1 summarizes the functions and sizes of the connectors. 0 ‘ 1 BOARD ASSY., M o d e l 5 E 1 0 / 5 E 6 0 P R I N T E R M E C H A N I S M PANEL ~:06;D;NL LEVER CRHOME PE-2...

  • Page 116: Control Panel

    REV.-B Table A-1. Board Connector Summarv Function Pins Board Connector Parallel interface BOARD ASW., CN 1 MAIN (C062 MAIN Optional interface card BOARD) Control panel MOTOR, CR MOTOR, PF Printhead Printhead DETECTOR ASSY., HP (HP sensor) DETECTOR ASSY., PE, REAR CN 10 DETECTOR ASSY., PE, PRONT CN 11...
  • Page 117 REV.-B Table A-2. CN2 BOARD ASSY., MAIN (C062 MAIN) Table A4. CN4 BOARD ASSY., MAIN (C062 MAIN) Function Signal Name Function Signal Name MOTOR, CR phase A +5 VDC MOTOR, CR phase B MOTOR, CR phase C + 5 VDC MOTOR, CR phase D + 5 VDC CRCOM...
  • Page 118 REV.-B Table A-13. CN13 BOARD ASSY., MAIN (C062 MAIN) ~Tfi Table A-7. CN7 BOARD ASSY., MAIN (C062 MAIN) Function Signal Name Function Signal Name Head data 3 Power switch signal data 11 +5 VDC HD 11 Head Head data 2 + 5 VDC Head data 19 Signal ground...
  • Page 119 ., .,,...,,, II!, “w -1 :-- Rectlf Ler Filter Diagram Figure A-4. BOARD ASSY., POWER (C062 PSB...
  • Page 120 REV.-B , . :,, “’T----- I I I $3-L ‘c . ‘f . >: (C062 PSB Board) Circuit Diagram Figure A-5. BOARD ASSY., POWER...
  • Page 121 Rectifier Filter Figure A-6. BOARD ASSY., POWER SUPPLY (C062 PSE BOARD) Circuit Diagram (Annotated) 1...
  • Page 122 REV.-B ,,~,$,,, < — ,4----- Figure A-7. BOARD ASSY., POWER SUPPLY (C062 PSE Board) Circuit Diagram A-1 O...
  • Page 123 REV.-B —-— 1— -1 ‘1 ‘ i-– Figure A-8. BOARD ASSY., PANEL (C062 PNL BOARD) Circuit Diagram A-1 1...
  • Page 124 REV.-B ..; , , A-3. CIRCUIT BOARD COMPONENT LAYOUT .--, .--1 ;,p: , . .., ,.. . 45 + ,,----1; ,,:,,Jy; ‘, EIN3 Figure A-9. BOARD ASSY., MAIN (C062 MAIN Board) Component Layout A-1 2...
  • Page 125 REV.-B -11- —. “ Figure A-10. BOARD ASSY., POWER SUPPLY (C062 PSB BOARD) Component Layout A-1 3...
  • Page 126 c , . : : , ; , =. REV.-B .,--- {, .,:’ ASSY 2 0 0 2 8 5 0 0 0 Figure A-1 1. BOARD ASSY., POWER SUPPLY (C062 PSE Board) Component Layout A-1 4...
  • Page 127 REV.-B Zluo — — — Figure A-1 2. BOARD ASSY., PANEL (C062 PNL BOARD) Component Layout A-1 5...
  • Page 128 Figure A-1 3. LQ-570 Exploded Diagram A-1 6...
  • Page 129 REV.-B A-1 9...
  • Page 130 REV.-A Part Nn. Rafermwxi Table Tahici ““. ---- ---- ----- ---- Ref. No. Description Ref. No. Description HOUSING ASSY., LOWER COMPRESSION SPRING, 200 PLAIN WASHER (M5 X 16) SHIELD PLATE, BOTTOM HOLDING PLATE, FFC SPUR GEAR, 40 FRAME, MAIN, LEFT GROUNDING PLATE, l/F COVER ASSY., PRINTER FRONT COMBINATION GEAR...
  • Page 131 REV.-A Table A-14. Part No. Reference Table (Cont.) Ref. No, Description Ref. No, Description SPUR GEAR, PAPER TENSION SPRING RETAINING RING TYPE-E(5) SHAFT, CR, GUIDE LEVER, G, ADJUST PULLEY, DRIVEN BELT PULLEY FLANGE SHAFT, DRIVEN, PULLEY PLAIN WASHER 3.2 XO.5 X 7 CABLE, HEAD, FRONT CABLE, HEAD, REAR GROUNDING PLATE, CR...
  • Page 132 REV.-A A.5 CASE OUTLINE DRAWING u“ -q?., @ :: -. ,.,. 151 m Figure A-1 7. LQ-570 Case Outline Drawing A-22...
  • Page 133 C-71 — - - - - - - l “’mm~ 151 m Figure A-1 8. LQ-107O Case Outline Drawing A-23...
  • Page 134 EPSON SEIKO EPSON CORPORATION PRINTER DIVISION EPSON OVERSEAS MARKETING LOCATIONS EPSON DEUTSCHLAND GmbH EPSON AMERICA, INC. 20770 Madrona Avenue Zulpicher Straf3e 6, 4000 Dusseldorf 11 Torrance CA 90503, U.S.A. F.R. Germany Phone: (2 13) 782-0770 Phone: (02 1 1) 56030...
  • Page 135 ,<” , EPSON Printed in Japan 91 .09-.5-G...

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