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Epson LQ-1170 Service Manual

Terminal printer
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EPSON
EPSON TERMINAL PRINTER
L Q - 8 7 0 / 1 1 7 0
4000694
REV.-A

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  • Page 1 EPSON EPSON TERMINAL PRINTER L Q - 8 7 0 / 1 1 7 0 4000694 REV.-A...
  • Page 2 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. @ Copyright 1991 by SEIKO EPSON CORPORATION...
  • Page 3 THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS. WARNING 1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN. 2. 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. Describes preventive maintenance techniques and lists C h a p t e r 6 - lubricants and adhesives required to service the equipment.
  • Page 5 REV.-A REVISION SHEET 1st issue July 23, 1991 ..~<..,.
  • Page 6 REV.-A TABLE OF CONTENTS CHAPTER 1. GENERAL DESCRIPTION CHAPTER 2. OPERATION PRINCIPLES CHAPTER 3. DISASSEMBLY AND ASSEMBLY ADJUSTMENTS CHAPTER 4. CHAPTER 5. TROUBLESHOOTING CHAPTER 6. MAINTENANCE APPENDIX vi -...

  • Page 7: Table Of Contents

    REV.-A CHAPTER 1 GENERAL DESCRIPTION FEATURES ..................@.m...m..mmo.om. S P E C I F I C A T I O N S ..................1.2.1 Hardware Specif ications...........""".."..
  • Page 8 REV.-A ,:,., LIST OF FIGURES Exteror View of the LQ-870/l 170 ........1-2 Figure 1-1. Pin Configuration ........m.........l.3 Figure 1-2. Printable Area for Single-Sheet Paper ......1-6 Figure 1-3. Printable Area for Continuous Paper ....... . . 1-6 Figure 1-4.

  • Page 9: Features

    Optional tractor that can be used to create a push-pull tractor feeding Optional interface cards The LQ-870/l 170 is equipped with the standard EPSON 8-bit parallel interface. The optional interface cards ensure compatibility with a wide variety of computers. Table 1-1 Lists the optional interface cards, Table 1-2 lists the optional units available for the LQ-8 70/1 170, and Figure 1-1 shows an exterior view of the LQ-870/ 1170.

  • Page 10: Optional Units

    REV.-A ~... The last digit in each part numbers above, represented by an asterisk (’), varies depending on the country. 200, 134.5, 110, or ‘ I. You cannot use the printer with the following baud rates: 1800, 75 bps. NOTE: Refer to the “Optional Interface Technical Manual” for more information on the optional interface cards.

  • Page 11: Specifications

    REV.-A 1.2 SPECIFICATIONS This section provides the specifications for the LQ-870/l 170. Hardware Specifications 1.2.1 Printing method Serial, impact, dot matrix 24 wires; 12 x 2 staggered, diameter 0.2 mm (.008 in.) Pin configuration Wires 1 Wires 2 — --— - - ’...

  • Page 12: Table 1-3. Specifications For Single-Sheet Paper

    REV.-A Friction feeding precautions Move the release lever to the FRICTION position. Load paper into the front or top paper entrance. Do not use continuous paper. Do not perform any reverse feeds within the top 8.5 mm (.34 in.) or bottom 22 mm (.87 in.) of the paper.

  • Page 13: Table 1-4. Specifications For Single-Sheet Multi-Part Forms

    REV.-A Table 1-4. Specifications for Single-Sheet Multi-Part Forms (Carbonless) (80/1 36 column) 182 to 2 16/364 mm (7.2 to 8.5/1 4.3 in.) Width 257 to 297 mm (10.7 to 11.7 in.) Length 0.065 to 0.14 mm (0.0025 to 0.0055 in.) — per sheet Thickness 0.12 to 0.64 mm (0.0047 to 0.0256 in.) total 17 to 24 lb (52.3 to 90 g/m2) single sheets...

  • Page 14: Figure 1-4 Printable Area For Continuous Paper

    REV.-A See Figures 1-3, 1-4, and 1-5. Printable area 148.257 mm (5.8.10. 1‘“) tog insertton front insertion 182-257 mm (72-1 o 1“) > & “1) > Printable area Max. 203.2 mm [8 In.) “ 1) —a--A 85mm [ 0 3 3 ” ) or n /, / 364mm...
  • Page 15 REV.-A 80-column: Ink ribbon Black ribbon cartridge #7753 Film ribbon cartridge #7768 136-column: Black ribbon cartridge #7754 Film ribbon cartridge #7770 Color Black 2 million characters at 48 dots/character (black ribbon) Life 0.2 million characters at 48 dots/character (film ribbon), 80-column 0.3 million characters at 48 dots/character (film ribbon), 136-column Dimensions of ribbon cartridge: 80-column:...
  • Page 16 REV.-A 1 0 0 0 VAC rms for one minute or $“” Dielectric strength 1 2 0 0 VAC rms f o r o n e s e c o n d (between AC line and chassis) 220 to 240 VAC 220 to 240 V Rated voltage version 198 to 264 VAC...

  • Page 17: Firmware Specifications

    REV.-A 1.2.2 Firmware Specifications ESC/PTM level ESC/P 2 Control codes (EPSON standard code for printers) Bidirectional with logic seeking Printing direction Input data buffer 8KB, 32KB, 64KB; to change RAM (4A 5A) This printer is able to input buffer capacity 8, 32, or 64KB...
  • Page 18 REV.-A NOTES: High-speed draft is valid when the printer’s status is as follows: High-speed draft mode is selected by DIP switch(SVV1-6). Emphasized mode is not selected. Condensed mode is not selected. Draft mode is selected. No D/L (download) characters are sent to the printer. The horizontal dot space of characters is not set.
  • Page 19 REV.-A Table 1-9. Printing (Bit Image Mode) 80/1 36-Column Pins [ Bit Image Printing Mode I D e n s i t y (dpi) I Printable Dots I Printing Speed (ips) 8 I Single-density 480/8 16 27.5 960/1 632 Dual-density 13.8 8 ] Double-speed, dual-density 960/1 632...

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

    REV.-A ,<’,, Table 1-10. Character Matrix and Character Size Unit ESC Character Size Face Matrix printing Mode — 2.0 x 3.1 7 x 22 High-speed draft, 10 pitch 1.9 x 3.1 9 x 22 Draft, 10 pitch 1.9 x 3.1 9 x 22 Draft, 12 pitch 1.0 X 2.3...

  • 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 > < & 9 dots 29 dots (Typical LQ, excluding 15 pitch) 15 dots for 15 pitch and condensed LQ Character width (CW) Character width (CW) >...

  • Page 22: Parallel Interface

    REV.-A 1.3 PARALLEL INTERFACE interface are as follows: The specifications for the printer’s 8-bit parallel 8-bit parallel Data format /STROBE signal Synchronization BUSY and /ACKNLG signal Handshaking TTL-compatible Signal level or equivalent 57-30360 (AmphenOl) Adaptable connector See Figure 1-6. Data transmission timing BUSy ACKNLG DATA...
  • Page 23 Table 1-11. Connector Pin Assignments and Signal Functions (Cont.) Return Dir. Functional Description Pin No. Signal Name 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). Not used.

  • Page 24: Control Panel

    REV.-A 1.4 CONTROL PANEL There are seven non-lock buttons and 19 indicators on the control panel. u DRAFT m Saris. Sefil 0 Script. C 0 OCR E 0 POWER 0 DATA FONT 0 C o u r i e r O P r e s t i g e 0 ORATOR U SLOT 0 MULTI.

  • Page 25: Indicator Lights

    REV.-A 1.4.2 Indicator Lights (1) OPERATING (green) Lit when the printer’s operate switch is on and AC power is supplied. PAUSE (orange) Lit when the printer is in PAUSE mode. In PAUSE mode, there is no printing or paper feeding and the printer does not accept data.

  • Page 26: Dip Switches And Jumpers

    REV.-A 1.5 DIP SWITCHES AND JUMPERS This section describes the DIP switches and jumpers of the LQ-870/l 170. DIP Switches 1.5.1 The printer has two banks of DIP switches located on the control panel. Tables 1-12 through 1-15 describe the functions of the DIP switches. The status of the DIP switches is read only at power-on or upon receipt of the /l NIT signal.

  • Page 27: Jumpers

    REV.-A Table 1-14. International and PC Character Set Selection Country U s . France Germany 8 6 0 U.K. Denmark 1 (437) Sweden ‘ Italy (437) Spain 1 (437) When you turn on DIP switch 1-4 and use ESC + O to select the italic character table, the country setting becomes U.S.

  • Page 28: Operating Instructions

    REV.-A 1.6 OPERATING INSTRUCTIONS This section describes the self-test, hexadecimal dump function, error states, printer initialization, and buzzer operation. Self-Test 1.6.1 To run the self-test in draft mode, turn on the printer while pressing the LOAD/EJECT button. To run LINE FEED/FORM FEED the self-test in LQ mode, turn on the printer while pressing the button.

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

    REV.-A 1.6.3 Paper-Out Detection and Form Override Function The paper-out detector is attached to the printer mechanism. When the paper-out detector senses a paper end, the printer first performs a form override. If paper loading fails, the BUSY signal goes HIGH, the PAPER OUT indicator light comes on, the interface PE signal becomes HIGH, the \ERROR signal becomes LOW, and the printer enters the PAUSE condition.

  • Page 30: Initialization

    REV.-A 1.6.6 Printer Initialization There are three types of initialization: hardware, software, and control panel. (1) Hardware initialization This type of initialization takes place when you turn on the printer (and the AC power cord is plugged in) or when the ANIT signal is received. When the printer is initialized, it performs the following actions: (a) Initializes the printer mechanism.

  • Page 31: Paper Loading And Ejection

    REV.-A 1.6.8 Paper Ejection Loading and pull tractor drive mechanism. This provides the printer with the The release lever can disengage the following paper handling features: Automatic single-sheet loading without the cut-sheet feeder Move the release lever to the friction feed position and place the sheet along the top or front paper guide.

  • Page 32: Paper-Thickness Lever Operation

    REV.-A Short tear off To use 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 the PAUSE or the RUNNING condition.
  • Page 33 REV.-A 1.6.11 Protection during Heavy Duty Printing This printer has a protection function to prevent the printhead from overheating and to stop printing when the head driver voltage drops. If the temperature of the printhead exceeds the maximum allowed value, printing stops automatically. When the printhead temperature drops to a certain value, printing resumes.

  • Page 34: Main Components

    REV.-A 1.7 MAIN COMPONENTS The main components of the LQ-870/l 170 are designed for easy removal and replacement during maintenance and repair. The main components are: the main control board; the CPU on this board controls all the printer’s 1) C060 MAIN board: main functions.

  • Page 35: C060 Pnl Board (Control Panel Circuit Board)

    REV.-A 1.7.2 C060 PNL Board (Control Panel Circuit Board) The C060 PNL board is the LQ-870/l 170 control panel, which includes the buttons, indicator LEDs, and DIP switches. Figure 1-13. C060 PNL Board 1.7.3 C060 PSB/PSE Board (Power Supply Circuit Board) The power supply unit consists of a switching regulator circuit that converts the AC line voltage to the DC voltages (for example, +35 V and +5 V) used by the printer.

  • Page 36: C060 Drv Board (Head Control Circuit Board

    REV.-A 1.7.4 C060 DRV Board (Head Control Circuit Board) .f-”’h F’U4 135 The C060 DRV board consists of a SLA7024M hybrid IC, a PU 1501, and a transistor array. Figure 1-15. C060 DRV Board “ 1.7.5 M-5D1 O/5D60 Printer Mechanism The M-5D 10/5D60 printer mechanism was developed specifically for use with LQ-870/l 170.

  • Page 37: Housing

    REV.-A 1.7.5 Housing The LQ-870/l 170 housing consists of the upper, lower, and front cases. The front case houses the control panel board. The lower case contains the printer mechanism, main control circuit board, and power supply circuit board. (LQ-I 170) (LQ-870) Figure 1-17.
  • Page 38 REV.-A CHAPTER 2 OPERATION PRINCIPLES 2.1 PRINTER MECHANISM OPERATION ..........2-1 2.1.1 Printhead Mechanism .
  • Page 39 REV.-A Friction Feeding Using the Front Entrance ....2-9 Figure 2-13. Pull Tractor Feeding Using the Front Entrance ..2-9 Figure 2-14.

  • Page 40: Printer Mechanism Operation

    REV.-A 2.1 PRINTER MECHANISM OPERATION This section describes the Model 5D 10/5D60 printer mechanism and explains how it works. The Model 5D 10\5D60 printer mechanism features a 24-pin impact dot printhead for serial printing. The printer mechanism has four main parts: the printhead mechanism, the carriage movement mechanism, the paper advance mechanism, and the ribbon advance mechanism.

  • Page 41: Carriage Movement Mechanism

    REV.-A 2.1.2 Carriage Movement Mechanism A timing belt is connected to the carriage on its lower side. With the printhead installed, this carriage moves in either direction along the carriage guide shaft. The carriage is driven by the carriage motor, a stepping motor that drives the timing belt via the belt drive pulley.

  • Page 42: Paper Advance Mechanism

    REV.-A 2.1.3 Paper Advance Mechanism The printer uses friction feeding to advance single-sheet paper and tractor feeding to advance continuous paper. There are three ways to advance paper using a tractor feed mechanism: using the push tractor, using the pull tractor, or using the push and pull tractors together. During normal operation, the printer has one tractor that functions as either a push or a pull tractor, depending on where it is attached to the printer.
  • Page 43 BEV.-A ,f::, Push Tractor Method When the push tractor is selected, the tractor reduction gear engages the tractor gear on the tractor - assembly. The tractor reduction gear is driven by the paper-feed gear, which in turn is driven by the when turning in the direction of the black ~a~er-feed motor pinion gear.
  • Page 44 REV.-A Pull Tractor Method Pull tractor feeding is basically the same as push tractor feeding. In push tractor feeding, the tractor (the paper advance mechanism) is before the paper entrance. It pushes the paper through the printer mechanism. In pull tractor feeding, however, the tractor is after the paper entrance. Because it PUIIS the paper through the printer mechanism, it requires no paper tension unit.

  • Page 45: Paper Insertion Entrances

    REV.-A You use the release lever to switch between friction and tractor feeding. Setting the release lever to #-:. the friction feed position presses the paper advance roller against the platen. Setting the release lever to the tractor feed position separates the paper advance roller from the platen and releases this pressure. The release detector senses the current position of the release lever.
  • Page 46 REV.-A Rear paper insertion entrance When you insert paper into the rear entrance, the printer can use the push tractor, the pull tractor, or the push-pull tractor method to advance the paper. The rear paper-out detector senses when the paper runs out.
  • Page 47 REV.-A actor Paper Feed Roller Figure 2-11-1. Push-Pull Tractor Feeding Using the Rear Entrance Bottom paper insertion entrance When you insert paper into the bottom entrance, the pull tractor advances the paper. The front paper-out detector senses when the paper runs out. Paper (C Printhea $,-?,...
  • Page 48 REV.-A Front paper insertion entrance When you insert paper into the front entrance, the printer can use friction feeding, the push tractor, the pull tractor, or the push and pull tractors to advance the paper. The front paper-out detector senses when the paper runs out.
  • Page 49 REV.-A paper (Cut sheet) — w~~~~~’en’ion Printhead~~~@platen From Front Insertion Paper-End Sensor (Front) Push Tractor Feed Roller a P e r P F D r i v e R o l l e r ‘ the Front Entrance Figure 2-14-1 .P,ush Tractor Feeding Using paper (Continuous) Pull Tractor —...

  • Page 50: Ribbon Advance Mechanism

    REV.-A 2.1.4 Ribbon Advance Mechanism The ribbon drive gear advances the ribbon through a gear linkage. This arrangement of gears always turns the ribbon drive gear counterclockwise, regardless of the direction in which the carriage is moving. Table 2-2. Ribbon Advance Gear Linkage Direction of Carriage Gear Linkage Movement...

  • Page 51: Power Supply Operation

    REV.-A 2.2 POWER SUPPLY OPERATION The printer can be powered by either of two power boards: the 120 V C060 pSB board or the supply 220/240 V C060 PSE board. The only difference between these boards is in the Primary circuitry. The ways in which they supply power to the printer are identical.

  • Page 52: Power Supply Board

    REV.-A The +35 VDC line has a voltage overload protection circuit and a voltage drop protection circuit. The +35 V voltage overload protection circuit cuts the supply if the voltage reaches or exceeds +36 VDC. It stops switching circuit operation, which stops the output of the +35 VDC line. The voltage drop of the protection circuit protects the printer from damage that might occur if the secondary circuitry which...

  • Page 53: Control Circuit Operation

    REV.-A 2.3 CONTROL CIRCUIT OPERATION The control circuit consists of three boards: the C060 MAIN board (the main control board), the C060 DRV board (the drive board), and the C060 PNL board (the control panel board). This section describes how these boards work. 2.3.1 Control Circuit Operation Overview It controls all the components of The printer’s CPU is an 8-bit CPU TMP90C041 that runs at 10 MHz.
  • Page 54 REV.-A Table 2-5 lists the functions of the printer’s main components and circuits. The CPU converts the print data sent from the host computer to image data (the print image). Then the printer loads the image data to RAM. The printer processes each line of data sequentially. The CPU transfers the print data to the printhead drive circuit and sends the printhead drive pulse to the printhead drive circuit, The length...
  • Page 55 REV.-A # .:, Table 2-5. Functions of the Main IC and Circuits Functions IC or Circuit Location TMP90C041 Receives data from the host computer and loads the data to the input buffer in RAM (under interrupt processing control). Expands the input data held in the buffer to create image data.

  • Page 56: Reset Circuit

    REV.-A 2.3.2 Reset Circuit Figure 2-19 shows the reset circuit in block diagram form. The reset circuit issues the /RESET signal. The control circuits are initialized when they receive the \RESET signal. The conditions under which the \RESET signal is output are described below. When you turn on the power Immediately after you turn on the power, PST-520 (6C) outputs the /VCCON pulse.

  • Page 57: Sensor Circuits

    REV.-A Power On CPU Self Reset Vmml Figure 2-20. /RESET Signal Timing 2.3.3 Sensor Circuits Figure 2-21 shows the sensor circuits in block diagram form. When the printhead temperature exceeds the maximum allowed value, the TEMP2 signal and other signals, such as the CRHOME signal, are sent directly to the CPU.

  • Page 58: Carriage Motor Drive Circuit

    REV.-A Carriage Motor Drive Circuit 2.3.4 Figure 2-22 shows the carriage motor drive circuit. An open-loop, constant-current drive arrangement runs the carriage motor. 2-2 and 1-2 phase excitation drive the motor. 2-2 phase excitation corresponds to two 1-2 phase excitation steps. For each single-step phase change of a 2-2 phase excitation motor, the carriage moves 1/1 20 inch.

  • Page 59: Paper Advance Motor Drive Circuit

    REV.-A Paper Advance Motor Drive Circuit 2.3.5 The printer uses a stepping motor to advance the paper. The minimum amount the printer can advance paper is 1/360 inch. The motor is a 2-2 or 1-2 phase, constant-voltage drive motor. p70 to P73 in the CPU are the control ports for the stepping motor.

  • Page 60: Printhead Drive Circuit

    REV.-A 2.3.6 Printhead Drive Circuit The print data already has been Figure 2-24 shows the printhead drive circuit in block diagram form. expanded to create the image data. The CPU splits up this data three times and transfers this information to the latch circuit in the E05A49.

  • Page 61: Parallel Interface Circuit

    REV.-A 2.3.7 Parallel Interface Circuit f ‘:, Figure 2-26 shows the parallel interface circuit in block diagram form. The /STROBE signal latches the data sent from the host computer in E05A49. E05A49 automatically outputs the BUSY signal to stop the host computer from sending more data. Then it outputs the /lBF signal for the CpU. The CpU receives the \lBF signal via the interrupt signal input port P82, recognizes that the printer has received the data from the host computer, and reads the data latched in the E05A49.
  • Page 62 REV.-A CHAPTER 3 DISASSEMBLY AND ASSEMBLY 3 . 1 O V E R V I E W ....................3-1 Precautions .
  • Page 63 REV.-A LIST OF FIGURES Flowchart for Disassembling the Printer ..... . 3-4 Figure 3-1. Printer and Paper Eject Covers ... 3-5 Figure 3-2.

  • Page 64: Overview

    REV.-A 3.1 OVERVIEW This section describes disassembly precautions, tools, service checks after repair, and screw specifications. 3.1.1 Disassembly Precautions 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 cord from the external AC power socket.

  • Page 65: Service Checks After Repair

    REV.-A 3.1.3 Service Checks After Repair When repaired printer is to be sent back to the customer, 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 66: Screw Specifications

    REV.-A 3.1.4 Screw Specifications 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 Name Abbreviation Cross-recessed Bind head Cone point S tight screw s(c) Cross-recessed Bind head Cone point B tight screw CBB(C)

  • Page 67: Disassembly And Assembly

    REV.-A 3.2 DISASSEMBLY AND ASSEMBLY f“.:. This section describes how to disassemble and assemble the main components of the printer. When the procedure for installing a component in the printer is simply the reverse of the procedure for removing the component from the printer, no description of how to install the component is given. Assembly and adjustment notes follow the disassembly procedure description, when necessary.

  • Page 68: Removing The Printhead

    REV.-A 3.2.1 Removing the Printhead Remove the printer cover. 2. Remove the paper eject cover. — Printer Cover Figure 3-2. Removing the Printer and Paper Eject Covers 3. Remove the two screws that secure the printhead to the carriage. Lift out the printhead. 4.

  • Page 69: Removing The Printer Case

    REV.-A 3.2.2 Removing the Printer Case f“’” This section describes how to remove the front case and upper case. 3.2.2.1 Removing the Front Case 1. Remove the printer cover. 2. Use a screwdriver to release a clip and a screw that secure the front case to the upper case. Open the front case.

  • Page 70: Removing The Circuit Board

    REV.-A 3.2.3 Removing the Circuit Boards This section describes how to remove the main board (C060 MAIN board), the drive board (C060 DRV board), the power supply board (C060 PSB/PSE board), and the control panel board (C060 PNL board). 3.2.3.1 Removing the Drive Board (C060 DRV Board) 1.

  • Page 71: Removing The Power Supply Board

    REV.-A 3.2.3.3 Removing the Power Supply Board (C060 PSB/PSE Board) Remove the upper case, as described in Section 3.2.2.2. Remove the mechanism unit, as described in Section 3.2.4. Disconnect the cable from connector CN2 on the main board. Disconnect the cable from connector CN 1 on the power switch. Remove the two CBB(C) (M3 X 12) screws and the CBS(C)(M3 X 8) screws that attach the power supply supply board.

  • Page 72: Removing The Printer Mechanism

    REV.-A 3.2.4 Removing the Printer Mechanism Remove the upper case, as described in Section 3.2.2.2. Remove the CB (M3 X 6) screws that attach the FFC holding plate to the shield plate. Remove the FFC holding plate. Disconnect the 2 FFCS from connectors CN3 and CN4 on the drive board. Disconnect the cables for thefollowing C060 DRV board connectors: CN5 (white, 2-pin);...

  • Page 73: Disassembling The Printer Mechanism

    REV.-A 3.2.5 Disassembling the Printer Mechanism This section describes how to disassemble the main components of the printer mechanism. 3.2.5.1 Removing the Carriage Motor 1. Remove the printer mechanism from the lower case, as described in Section 3.2.4. 2. Remove the printer spring (1 056 gm) from the base frame and the carriage motor frame. 3.

  • Page 74: Removing The

    REV.-A 3.2.5.2 Removing the Paper Advance Motor 1. Remove the printer mechanism from the lower case, as described in Section 3.2.4. 2. Remove the retaining spring that holds the platen shaft. 3. Release the two clips holding the paper advance motor to the right frame. 4.

  • Page 75: Carriage

    REV.-A g:,. 3.2.5.4 Removing the Carriage 1. Remove the FFC, as described in Section 3.2.5.3. 2. Remove the timing belt from the carriage as described in Section 3.2.5.1. 3. Use the box driver to rotate and free the adjusting bushing. This bushing holds the carriage guide shaft to the right frame.
  • Page 76 REV.-A 3.2.5.5 Removing the Platen Remove the printer mechanism from the lower case, as described in Section 3.2.4. Remove the two CBP(C) (M3 X 10) screws that secure the platen cover to the left and right frames. Remove the platen cover. Remove the retaining spring that holds the platen shaft.
  • Page 77 REV.-A 3.2.5.6 Removing and Disassembling the Right Frame Remove the printer mechanism from the lower case, as described in Section 3.2.4. Remove the platen from the printer mechanism, as described in Section 3.2.5.5. Remove the carriage motor from the base frame, as described in Section 3.2.5.1. Remove the three CBS(C)(P) (M3 X 10) screws that secure the right frame to the base frame.
  • Page 78 REV.-A 3.2.5.8 Removing and Disassembling the Paper Guide Support Assembly 1. Remove the printer mechanism from the lower case, as described in Section 3.2.4. 2. Remove the platen from the printer mechanism, as described in Section 3.2.5.5. 3. Removing and Disassembling the Right Frame as described in Section 3.2.5.6. described in Section 3.2.5.7.
  • Page 79 REV.-A /..:, Assembly Note When you install the plain washer, insert it from the front in the direction indicated by the mark. Plain Washer Side Mark Figure 3-21. Plain Washer Insertion Direction Figure 3-22. Inserting the Release Shaft 3 - 1 6...
  • Page 80 REV.-A 3.2.5.10 Removing the Home-Position Sensor 1. Remove the printer mechanism from the lower case, as described in Section 3.2.4. 2. Remove the clips that secure the home-position sensor from the rear side of the base frame. Remove the home-position sensor from the rear of the base frame. Figure 3-23.

  • Page 81: Platen

    REV.-A #- :.,, 3.2.5.12 Removing the Front Paper-Out Detector Remove the p r i n t e r m e c h a n i s m f r o m t h e l o w e r c a s e , a s described in S e c t i o n 3.2.4. clips that hold the front paper-out detector to the base frame.
  • Page 82 REV.-A 3.2.5.14 Disassembling the Tractor Unit Remove the tractor unit from the printer. Remove the cog (17 mm) from the tractor shaft. Remove the right tractor frame from the tractor shaft and the tractor guide shaft. Remove E-ring 6 from the tractor shaft. Remove the right tractor, the paper support unit, and the left tractor from the tractor shaft and tractor guide shaft.

  • Page 83: List Of Figures

    REV.-A CHAPTER 4 ADJUSTMENTS ADJUSTING THE PRINTER MECHANISM ......... . 4-1 4.1.1 Carriage Motor Backlash Adjustment .

  • Page 84: Adjusting The Printer Mechanism

    REV.-A 4.1 ADJUSTING THE PRINTER MECHANISM This section describes the various adjustments you may need to make to the printer mechanism. 4.1.1 Paper feed Motor Backlash Adjustment In the PF motor backlash adjustment, the pinion gear of the PF motor is meshed smoothly with the cog. If the pinion gear is poorly aligned, printer operation becomes noisy, and the accuracy of character Iignment during printing suffers.
  • Page 85 REV.-A 4.1.2 Platen Gap Adjustment If you have rotated or reassembled the carriage guide shaft 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 lower case (see Section 3.2.4). Remove the printhead from the carriage (see Section 3.2.
  • Page 86 REV.-A is large enough for a 0.36 mm thickness gauge Rotate the adjusting bushing until the platen gap but too narrow for a 0.40 mm thickness gauge. 0.38 Platen Printhead Figure 4-4. Platen Gap 75th column print position for an Move the carriage until the edge of the printhead is at the 80-column printer or at the 130th column print position for a 136-column printer.
  • Page 87 REV.-A 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 88 REV.-A NO -+ GO TO STEP 6. Are the characters aligned vertically? YES ~ GO TO STEP 7. 3. Refer to the odd-numbered lines (Ist and 3rd), and adjust the even-numbered lines (2nd and 4th). * If the even-numbered lines are shifted o the right: e Press the LOAD/EJECT button once while pressing the ALT button.

  • Page 89: Troubleshooting

    REV.-A CHAPTER 5 TROUBLESHOOTING 5 . 1 O V E R V I E W ....................5.2 REPAIR BY UNIT REPLACEMENT .
  • Page 90 REV.-A 5.1 OVERVIEW the task of Problems in the printer may exhibit a variety of symptoms, which can complicate flowchart below. troubleshooting, unless you follow the procedure shown in the START 5 . 2 5 - 2 Repair by unit replacement 5 .

  • Page 91: Repair By Unit Replacement

    REV.-A 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 92 REV.-A (1) Printer Fails to Operate when Power is On correct AC input voltage. Replace the fuse and disconnect CN4 on the main board and CN2 on the drive board. is the new fuse also Measure the output voltage from the Power Supply board. >...
  • Page 93 REV.-A (2) Carriage Operation is Abnormal and CN 12 CN 11, connectin9 Secure connectors. c’” ., Replace the printer machanism. ~.,:, ..Replace the main board.
  • Page 94 Printing is Faulty During Self-Test, but Carriage Operation Set the head adjustment lever to the 2nd position, a n d p e r f o r m s e l f - t e s t . and CN3 connecting the drive board and the Perform bidirectional Reinsert them correctly.
  • Page 95 c . , : , . . : \ REV.-A Check printhead r e s i s t a n c e . Replace pluggable chips. Replace printhead. Replace logic PCB..
  • Page 96 Replace printhead and PH cable. Replace printhead Replace printhead. cable. Perform final t e s t .
  • Page 97 REV.-A #2 o #4 o #6 O #8 O 0 :1 o ~ l g 1123 # 240 Wire Assignment ) < Coil Resistance: 45.5 *3.2 0 at 25°C (Between each dot wire and common.) TEW2 IWO # 1 2 # 2 4 @ @ @Q@&...
  • Page 98 REV.-A (4) Paper Feeding is Abnormal (but Printing is Normal) START Load the paper correctly. platen knob rotate manually with power Refer to section 5.5, Repair of the printer ‘f’es mechanism. Replace the main board. \ END/ < Replace the main board. Refer to section 5.5, Repair of the printer mechanism.
  • Page 99 REV.-A -%.. “ Check drivers. Replace defective Replace logic PCB. m o t o r . NOTE < L“ , . NOTE Check motor resistance. Perform final t e s t . .-r... ‘ Replace motor. - ,., NOTE Perform final test. NOTE : Perform bidirectional print alignment adjustment.
  • Page 100 Check left and right tractors for proper phasing. replace. Clean or Check left and right tractors fOr proper phasing. Adjust phasing or replace sprocket asse m ry. Inspect paper path. < Reform final t e s t . 5-11...
  • Page 101 REV.-A ,f”+ (5) Control Panel Operation is Abnormal between the control panel Reinsert connector correctly. < ,“ Replace the main board. Replace the control panel boa rd. Replace the control panel Replace the main board. boa rd. 5 - 1 2...
  • Page 102 REV.-A Faulty (6) Printing of Data Sent by the Host Computer is is operating normally. NOTE: It is assumed here that the host computer Perform self test printing. Refer to other troubleshooting Replace the connection cable from the host computer. Replace the main board.
  • Page 103 REV.-A 5.3 REPAIR OF THE POWER SUPPLY BOARD “h ,:, . ,,. . This section describes problems that indicate that the power supply board is defective, and provides various symptoms, likely causes, and checkpoints. Checkpoints refer to power waveforms, resistance values, and other values to be checked to evaluate the operation of any component that might be bad.
  • Page 104 Table 5-4. Repair of the Power SUDDIY Board (Continued) Action Checkpoint Cause Condition Check the +35V line. T h e +35V line is The voltage at + 5V line is dead. dead. Replace IC21. Check the oscillation waveform (IC21, pin ICI is dead.
  • Page 105 REV.-A 5.4 REPAIR OF THE MAIN/DRIVE BOARD This section provides instructions for repairing the main board when it is defective and describes various symptoms, likely causes, and checkpoints. Checkpoints refer to proper waveforms, resistance values, and other values to be checked to evaluate the operation of any component that might be bad. Check these values and take the appropriate action.
  • Page 106 REV.-A air of in the Main/Drive Circuit Board (Continued) Table 5-5. R Solution Checkpoint Symptom Cause Problem Replace IC3A Either ROM or The CPU does The printer or IC4A. RAM is not operate. does not op- defective. erate at all. If a signal is The CPU is Check the oscillator signal at either pin 33...
  • Page 107 REV.-A (continued ) Table 5-5. Repair of in the Main/Drive Circuit Board 5 - 1 8...

  • Page 108: Repair Of The Printer Mechanism

    REV.-A 5.5 REPAIR OF THE PRINTER MECHANISM For detailed procedures for replacing or adjusting parts, refer to Chapter 3, Disassembly and Assembly, and Chapter 4, Adjustment. If a problem or symptom recurs following an attempted repair, refer to Table try to find other potential causes. Table 5-6.
  • Page 109 REV.-A Table 5-6. Repair of the Printer Mechanism (Continued) Checkpoint Cause Solution Problem Symptom Measure the particular dot The printhead is coil re- Self-test printing Replace the printhead. sistance of the abnormal. fails to print. defective. printhead. The nor- mal value is ap- proximately 45.5 ohms.
  • Page 110 REV.-A Table 5-6. Repair of Printer Mechanism (Continued) Ceuse Checkpoint Solution Problem Symptom The ribbon is not The ribbon feed is Dismount the rib- Replace the ribbon The ribbon car- fed. tridge is defective. bon cartridge, ro- cartridge. abnormal. tate its knob manu- ally, and check whether the ribbon feeds normally.
  • Page 111 REV.-A CHAPTER 6 MAINTENANCE 6.1 PREVENTIVE MAINTENANCE ............. 6-1 6 .

  • Page 112: 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 O-2, G-20, and G-26, all of which have been tested extensively and found to comply with the needs of this printer.
  • Page 113 REV.-A Table 6-2. Lubrication Points (Refer to Figure 6-2) .~tj Lubrication Points Lubricant ‘“ Ref. No. 1/4 of the perimeter of the top edge of the gear (8.5 mm, 30 mm) G-26 l\3 of the perimeter of the top edge of the gear (40 mm) G-26 G-26 ] 1/3 of the perimeter of the top edge of the platen gear...
  • Page 114 REV.-A Figure 6-2. LQ-870 Lubrication Points...
  • Page 115 REV.-A Figure 6-3. LQ-1 170 Lubrication Points...
  • Page 116 REV.-A APPENDIX S U M M A R Y ..............A-1 C O N N E C T O R CIRCUIT DIAGRAMS .
  • Page 117 REV.-A ‘) ,,., Table A-8. CN1 (C060 DRV Board) ............Table A-9.
  • Page 118 REV.-A 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. AC INPUT rlFusE POWER AC in SWITCH (3P IN) Board (8PI 1 — LEVER P’ MOTOR CR MOTOR HEAD HEAD ICN4...
  • Page 119 REV.-A Table A-1. Board Connector Summary Board Connector Function Color PINS C060 CN 1 Parallel interface BLACK MAIN BOARD BLACK Optional interface card GRAY Font cartridge card BLACK Power supply board (+5VDC) Driver board BLACK Panel board BLACK C060 CN 1 Main board BLACK DRV BOARD...
  • Page 120 REV.-A Table A-3. CN2 (C060 M A I N ) Table A-2. CN1 (C060 M A I N ) Signal Name Signal Name + 5V STROBE DATA DATA2 + 5V DATA3 + 5V DATA4 + 5V DATA5 DATA6 READY DATA7 DATA8 —...
  • Page 121 REV.-A Table A-4. CN3 (C060 M A I N ) ‘“+ .-’, Signal Name Signal Name — + 5V — + 5V — + 5V PROGAl 6 –PREQ –MREQ –CNT PROGAl 5 –PROG PROGAl 4 –RAM CGA22 –CG – W R CGA 18 –RD PROGAl 3...
  • Page 122 REV.-A Table A-6. CN5 ( C060 MAIN ) Signal Name Signal Name LEVER -PFA HI 1 CR HOME + 5V +35V +35V Table A-7. CN6 ( C060 MAIN ) Single PF COM -HOLD PAUSE + 5V LDLED -PFB PE3 N.C LDSW +5 v + 5V...
  • Page 123 REV,-A Table A-8. CN1 ( C060 DRV Board ) Signal Name Signal Name LEVER HI 1 -PFA CR HOME + 5V + 5V + 5V +35V Table A-9.CN2 ( C060 DRV Board ) +35V ‘ Signal Name PF COM -HOLD +35V -1-35V -PFB...
  • Page 124 REV.-A Table A-1 3. CN6 (C060 DRV Board) Table A-1 O. CN3(C060 DRV Board) Signal Name Signal Name CR-A HI 1 CR-B CRCOM Table A-14. CN7(C060 DRV Board) Signal Name PF-A PF-B PFCOM Table A-1 1.CN4 (C060DRV Board) Signal Name Table A-1 5.
  • Page 125 REV.-A Table A-21. CN2(C060 PSB Board) Table A-1 8. CN11(C060 DRV Board) Signal Name Signal Name + 5V PE1 (FRONT) + 5V Table A-1 9. CN12(C060 DRV Board) Signal Name +35V +35V PE2 (REAR) Table A-22. CN1(C060 PNL Board) Signal Name Table A-20.
  • Page 126 — I > xxx. -—. — — — — — — — — — — — — -. — -— — — — — — — — — — — — 1111 I — l!lll Circuit Diagram Figure A-3. C060 DRV Board A-1 1...
  • Page 127 F’! --- ‘ ..Figure A-4. C060 PSB Board Circuit Diagram...
  • Page 128 Figure A-5. C060 PSE Board Circuit Diagram...
  • Page 129 REV.-A c’ .“:, ,’ . . . *- --- Figure A-6. C060 PNL Board Circuit Diagram . : . . , , , A-1 4...
  • Page 130 A-3. CIRCUIT BOARD COMPONENT LAYOUT Figure A-7. C060 MAIN Board Component Layout A-1 5...
  • Page 131 ”,:?, ------- ~.--._---7--~ 02291 o - - ’ -s91 13!2 Figure A-8. C060 DRV Board Component Layout A-1 6...
  • Page 132 12SV PROTECTION AGAINST n%K , RE::ACE OF FIRE ONLY WITH S A M E TVPE A N O R A T I N G S Figure A-9. C060 PSB Board Component Layout A-1 7...
  • Page 133 REV.-A “ — I I I I 12 I “= Figure A-1 O. C060 PSE Board Component Layout A-1 8...
  • Page 134 M6WI ,e < J4 1 l— fl”’3 iti%fl! i%wl! — .J27 — Figure A-1 1. C060 PNL Board Component Layout A-1 9...
  • Page 135 REV.-A A.4 EXPLODED DIAGRAM Figure A-1 2-1. Exploded Diagram for LQ-870 A-20...
  • Page 136 REV.-A Z& Figure A-1 2-2. Exploded Diagram for LQ-1 170 A-2 1...
  • Page 137 REV.-A , : : , . , . , , . , ., f’ . . , . g’”. ..=. , Figure A-1 3-1. Exploded Diagram for Model-5Dl O A-22...
  • Page 138 REV.-A Figure A-1 3-2. Exploded Diagram for Model-5D60 A-23...
  • Page 139 REV.-A Table A-23-2. Part No. Reference Table for LQ-1 170 Table A-23-1. Part No. Reference Table for LQ-870 Description Ref. No. Description Ref. No. HOUSING ASSY., LOWER HOUSING ASSY., LOWER FOOT FOOT HOUSING, FRONT HOUSING ASSY., UPPER HOUSING, FRONT HOUSING, FRONT COVER ASSY., PRINTER COVER ASSY., PRINTER EDGE GUIDE ASSY., REAR...
  • Page 140 DRAWING A.5 CASE OUTLINE .— -m _ — ‘ — — ‘m -— -— — /> /’ , ,/ /’ -— Figure A-1 4-1. Case Outline Drawing for LQ-870...
  • Page 141 REV.-A ‘T —1. hil l - l 1~ I I —.—. —. ,.— 141H f’=., Figure A-14-2. Case Outline Drawing for LQ-1 170 . , , A-26...
  • Page 142 EPSON SEIKO EPSON CORPORATION PRINTER DIVISION EPSON OVERSEAS MARKETING LOCATIONS EPSON AMERICA, INC. EPSON DEUTSCHLAND GmbH 2780 Lomita Blvd., Zulpicher StraRe 6, 4000 Dusseldorf 11 Torrance, Calif. 90505, U.S.A. F.R. Germany Phone: (02 1 1) 56030 Phone: (2 13) 539-9140...
  • Page 143 EPSON Printed in Japan 91 n7.

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