Page 1 EPSON TERMINAL PRINTER 4000566 REV.-B...
Page 2 “ The contents of this manual are subject to change without notice. ‘ 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.
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 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: List Of Figures
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) High-capacity cut-sheet feeder (80-column) sheet feeder (1 36-column) High capacity cut sheet feeder (1 36-column) C80019* Tractor unit (80-column) Tractor unit (1 36-column) Fabric ribbon cartridge (80-column) 7753 Fabric ribbon cartridge (1 36-column) 7754 7768 Film ribbon cartridge (80-columd...
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 - - - - - - ’ $ 1/90”...
Page 12 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 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
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)) f r o n t i n s e r t i o n 1 8 2 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 Power consumption in draft mode, 10 cpi) Insulation resistance 10 megohms, minimum (at 500 VDC between AC line and chassis).
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 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 REV.-B Table 1-9. Printing (Bit Image Mode) Pins I Bit Image Printing Mode 480 (*8 16) 21.0 Single-density 960 (“ 1632) 10.5 Dual-density (“1632) 21.0 8 I Double-speed, dual-density 1920 (*3264) 10.5 Quadruple-density 640 (“ 1088) 10.5 CRT graphics (“1224) 14.0 8 I CRT graphics II 480 (*8 16)
Page 20: Table 1-10. Character Matrix And Character Size
REV.-A Table 1-10. Character Matrix and Character Size Printing Mode 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 Draft, 12 pitch 9 x 22 1.9 x 3.1 Draft, 15 pitch 7 X 16 1.0 X 2.3...
Page 21: Figure 1-5. Character
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 36 dots (10 CPI)’360 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 Adaptable connector 57-30360 (Amphenol) or equivalent...
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 (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
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 The two DIP switch banks for the printer, located on control panel, function as shown in tables 1-12 through 1-15.
Page 27 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 When SW 1-4 is ON, if italic table was selected by Table 1-15.
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 button.
Page 29: Paper-Out Detection And Forms Override Function
Paper-out Detection and Forms Override Function 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 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 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
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, paper through the printer.
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 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 the paper through the PRINTER 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) PF Drive Roller / 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) EJECT ROLLER ASSY., PAPER PF Drive Roller...
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
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
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 Location This is a chip that houses drive circuits for the printhead, MOTOR,CR single and MOTOR, PF of the PRINTER MECHANISM. The chip also includes the various sensor input circuits for the PRINTER MECHANISM. PROM contains the program that runs the CPU.
Page 54: Sensor Circuits
REV.-A Power On CPU Self Reset +5 V Line - 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 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. The CPU samples the voltage of the +35 V line via the A/D convertor (see Section 2.3.3).
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 Cross-recessed Bind head Cone point B tight screw Cross-recessed Bind head screw CBS(0)
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 2. Remove the COVER ASSY., EJECT. HEET GUIDE “(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. 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 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 DETECTOR 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
3.2.5.13 Arranging the Cables printer, make sure that the cables are laid out as shown in this figure. PRINTER MECHANISM (Bottom) (*This is an 80-column printer.) Figure 3-28. Arranging the Cables 3-20...
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 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 PLATEN 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 Are the characters aligned vertically? 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. (The reference value increases + 1 and even lines shift to the left.) the left: If the even-numbered lines are shifted to and even lines shift to the right.)
Page 87: Circuit Adjustment
REV.-B 4.3 CIRCUIT ADJUSTMENT balancing the circuitry. When any of the following parts are replaced, the circuitry must be balanced again by adjusting this variable resistance: 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 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 input voltage. Replace the fuSe and disconnect is turned ON again, Measure the output voltage from the Power Supply board. Replace the BOARD ASSY., PoWER SUPPLY. PRINTER Replace the MECHANISM.
Page 92 REV.-B (2) Carriage Operation is Abnormal CN 12,CN8,CN9,CN 10, 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 Wire Assignment ) < Coil Resistance: 45.5 ~3.2 Q at 25°C (Between each dot wire and common.) cOM. H 21 tIi3 #5 Terminal Assignment ) <...
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, Repair of the PRINTER MECHANISM. Replace the BOARD ASSY., MAIN. Replace the BOARD ASSY., MAIN. Replace the BOARD ASSY., Refer to seCt;On 5.5, MAIN and the...
Page 98 Replace defective Replace logic PCB. m oto r. NOTE NOTE Check motor resistance. Perform final t e s t . Replace motor and 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. Reform final test. 5-11...
Page 100 REV.-B Control Panel Operation is Abnormal Reinsert connector CN3 correctly. 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 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 The CPU does RAM is not operate. defective. If a signal is detected, re- defective. place ICI C. Otherwise, re- place CR1.
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 ing is abnormal.
Page 105: Repair Of The Printer Mechanism
5.4 REPAIR OF THE PRINTER MECHANISM For detailed procedures for replacing or adjusting parts, refer to Chapter 3, 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
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 fails to print. defective. abnormal. mal value is ap- proximately 45.5 ohms. Replace the Check whether the dot wire is worn.
Page 107 REV.-B Table 5-5. ReDair of the PRINTER MECHANISM (Cont.] 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 Figure A-1 illustrates the interconnection of the primary components. Table A-1 summarizes the functions and sizes of the connectors. 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 LEVER CRHOME PE-2 H E A D H E A D...
Page 116: Control Panel
REV.-B Table A-1. Board Connector Summarv Function Pins Board Connector Parallel interface BOARD ASW., MAIN (C062 MAIN Optional interface card BOARD) Control panel MOTOR, CR MOTOR, PF DETECTOR ASSY., HP (HP sensor) DETECTOR ASSY., PE, REAR CN 10 DETECTOR ASSY., PE, PRONT CN 11 DETECTOR ASSY., PLATEN CN 12...
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 MOTOR, CR common...
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 -1 :-- Diagram Figure A-4. BOARD ASSY., POWER...
Page 120 REV.-B I I I 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 Figure A-7. BOARD ASSY., POWER SUPPLY (C062 PSE Board) Circuit Diagram A-1 O...
Page 123 REV.-B ‘ Figure A-8. BOARD ASSY., PANEL (C062 PNL BOARD) Circuit Diagram A-1 1...
Page 124 REV.-B A-3. CIRCUIT BOARD COMPONENT LAYOUT Figure A-9. BOARD ASSY., MAIN (C062 MAIN Board) Component Layout A-1 2...
Page 125 REV.-B Figure A-10. BOARD ASSY., POWER SUPPLY (C062 PSB BOARD) Component Layout A-1 3...
Page 126 REV.-B Figure A-1 1. BOARD ASSY., POWER SUPPLY (C062 PSE Board) Component Layout A-1 4...
Page 127 REV.-B — — — 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 A-1 9...
Page 130 Part Nn. Rafermwxi Table 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 FRAME ASSY., SHEET GUIDE SPUR GEAR, 13.2...
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 A.5 CASE OUTLINE DRAWING u“ 151 m Figure A-1 7. LQ-570 Case Outline Drawing A-22...
Page 133 — - - - - - - l 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 Torrance CA 90503, U.S.A. Phone: (2 13) 782-0770 Phone: (02 1 1) 56030 Fax: (21 1) 504-7787 Fax: (213) 782-5248 EPSON UK LTD.
Page 135 EPSON Printed in Japan 91 .09-.5-G...
Page 136 With the exception of a few parts, all parts for the ActionPrinter 5000/5500 are identical to those for the LQ-570/1070. Refer to the parts price list (PL-LQ57AP5) for a list of the unique parts for the Epson ActionPrinter 5000/5500.
Page 137 LQ-570/1070 ™ ActionPrinter 5000/5500 24-PIN DOT MATRIX PRINTERS TM-LQ57AP5...
Page 138: Service Manual
L Q - 5 7 0 / 1 0 7 0 SERVICE MANUAL EPSON Printed on Recycled Paper...
Page 139 NOTICE whatsoever without SEIKO EPSON’s express written permission is forbidden. However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them. errors in this manual or the consequences thereof. © Copyright 1991 by SEIKO EPSON CORPORATION...
Page 140 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 142 C h a p t e r 4 - Includes a step-by-step guide for adjustment. 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 143 REV.-B REVISION SHEET REVISON DATE ISSUED CHANGE DOCUMENT June 20, 1991 1st issue Added information for the LQ-1070: July 26, 1991 l-i, l-ii, l-l - l-8, l-10, l-l 1, l-24, l-26 - l-28 2-i, 2-ii, 2-l - 2-1 1, 2-13 - 2-15, 2-17, 2-18 3-i, 3-ii, 3-5 - 3-20 4-i, 4- 1 - 4-4, 4-6 5-i, 5-l - 5-5, 5-9, 5-1 1 - 5-19...
Page 144 REV.-A TABLE OF CONTENTS CHAPTER 1. GENERAL DESCRIPTION CHAPTER 2. OPERATION PRINCIPLES CHAPTER 3. DISASSEMBLY AND ASSEMBLY CHAPTER 4. ADJUSTMENTS CHAPTER 5. TROUBLESHOOTING CHAPTER 6. MAINTENANCE APPENDIX - vi -...
Page 145 REV.-B CHAPTER 1 GENERAL DESCRIPTION FEATURES ....................1-1 SPECIFICATIONS ................... 1-3 1.2.1 Hardware Specifications ............1-3 Firmware Specifications ............1-9 1.2.2 INTERFACE OVERVIEW ............... 1-14 1.3.1 Parallel Interface ............... 1-14 CONTROL PANEL ................... 1-16 DIP SWITCHES A N D JUMPER SETTING ........1-18 1.5.1 DIP Switch Settings ..............
Page 146: Specifications For Cut Sheets
REV.-B LIST OF FIGURES Exterior V i e w of the L Q - 5 7 0 / 1 0 7 0 ......... 1-2 Figure 1-1. Pin Configuration ..............1-3 Figure 1-2. Printable Area for Cut Sheets........... 1-6 Figure 1-3. Printable Area for Continuous Sheets..
Page 147: Features
Two ways to insert cut sheets (front/top) Auto loading The LQ-570/1070 are equipped with the standard EPSON 8-bit parallel interface. Various interface options ensure compatibility with a wide variety of computers. Table l-l lists the interface options,Table 1-2 lists the optional units available for the LQ-570/1070, and Figure l-l shows an exterior view of the LQ-570/1070.
Page 148 REV.-B Table 1-2. Optional Units Model c806371 Single-bin cut-sheet feeder (80 column) Singl-bin cut sheet feeder (136 column) High capacity cut sheet feeder (136 column) 7 7 5 3 Fabric ribbon cartridge (80 column) 7754 Fabric ribbon cartridge (136 column) 7768 Film ribbon cartridge (80 column) 7 7 7 0...
Page 149: Specifications
REV.-B 1.2 SPECIFICATIONS This section provides specifications for the LQ-570/1070 printer. 1.2.1 Hardware Specifications Printing method Serial, impact, dot matrix Pin configuration 24 wires (12 X 2 staggered, diameter 0.2 mm) Figure 1-2. Pin Configuration Feeding methods Friction feed (front/top) Push tractor feed (rear) Pull tractor feed (front/bottom) Push-pull tractor feed (with optional tractor) (rear)
Page 150 REV.-B Use the paper tension unit. 2. Push tractor feed (release lever in REAR PUSH POSITION). l Since accuracy of paper feed cannot be assured after the paper end has been detected, please do not perform reverse feeding after detection of a paper end. 3.
Page 151 REV.-B Table 1-4. Sheets (Carbonless Duplicating Paper) Specifications 257 mm to 297 mm (10.1 in. to 11.7 in.) 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. to 0.012 in.)- total 17 lb to 24 lb (52.3 g/m2 to 90 g/mZ)-single sheet 12 lb to 15 lb (40 g/m* to 58 g/m*) - each Carbonless duplicating paper...
Page 152 REV.-B Printable area See figures 1-3, l-4, and l-5 (80 column): 24 mm (0.9 in.)(top insertion)/26 mm (1 .O in.)(front insertion) or more when paper width is 229 mm (9.0 in.) to 257 mm (10.1 in.). (136 column:) 3.0 mm (0.12 in.) or more when the width of paper is less than 392 mm (15.4 in.). 29 mm (1.14 in.) (top insertion) /31 mm (1.22 in.) (front insertion) or more when the width of paper is 392 mm (15.4 in.) to 420 mm (16.4 in.).
Page 153 REV.-B (80 column): (0.9 in.)(rear insertion)/ 26 mm (1.0 in.) (front/bottom insertion) or more when a paper width of mm (10 in.) is used. (136 column): mm (0.51 in.) or more using a paper width of 101 to 401.3 mm (4 to 15.8 in.). 15 mm (0.6 in.) or more using a paper width of 381 to 406 mm (15 to 16 in.).
Page 154 REV.-B Rated voltage 220 to 240 VAC 220 to 240 V version 198 to 264 VAC Input voltage range 50 to 60 Hz Rated frequency 49.5 to 60.5 Hz Input frequency 1.0 A Rated current Approx. 33 W (during a self-test Power consumption in draft mode, 10 cpi) 10 megohms, minimum (at 500...
Page 155: Firmware Specifications
E P S O N R o m a n 1 0 , 12, 15, proportional Bit-map fonts EPSON Sans Serif 10, 12, 15, proportional E P S O N C o u r i e r 1 0 , 12, 15...
Page 156 REV.-B High-speed draft is valid if the printer status is as follows: NOTES: Emphasized character mode is not selected. (The printer switches back into normal mode to print emphasized, condensed, or download characters and bit images.) Printing speed See tables l-8 and l-9. Printing columns See Table 1-8.
Page 157 REV.-B Table 1-9. Printing (Bit Image Mode) Single-density 2 1 .o Dual-density 10.5 8 1 Double-speed, dual-density 2 1 .o Quadruple-density 2 4 0 10.5 CRT graphics 10.5 CRT graphics II 14.0 Single-density 21.0 24 / Dual-density 10.5 14.0 24 1 CRT graphics II 24 1 Triple-density 24 ) Hex-density 3 6 0...
Page 158 REV.-A Table l-10. Character Matrix and Character Size LQ, proportional, condensed NOTES: 0 HDD is horizontal dot density dots per inch. dependent on paper, ribbon, etc. indicates the minimum length to be added to the right of the character specified with the ESC sp control code.
Page 159 REV.-A (Typical LQ character) (Typical draft character) Ascender area Ascender area Ascender area Descender area Descender area 29 dots (Typical LQ, excluding 15 pitch) 15 dots for Character width (CW) 15 pitch and condensed LQ Character width (CW) 12 dots (10 CPI) 120 DPI 15 dots (12 CPI) 180 DPI 16 dots (15 CPI) 240 DPI dots (10 CPI)‘360 DPI...
Page 160: Interface Overview
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 STROBE signal Synchronization BUSY and ACKNLG signal Handshaking TTL-compatible Signal level 57-30360 (Amphenol) or equivalent Adaptable connector See Figure l-6.
Page 161 REV.-A Table l-l 1. Connector Pin Assignments and Signal Functions (Cont.) s a line feed upon input of the Ground for twisted-pair grounding. Not used. Always HIGH. (Pulled up to +5V through 3.3K ohm resistor.) SLCT-IN NOTES: 1. “Dir.” indicates the direction of the signal flow as viewed from the printer. 2.
Page 162: 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 BUTTONS (1) OPERATE Button This button turns on the power supply to the printer. (2) PAUSE Button This button controls printer action.
Page 163 REV.-A (7) FONT Button Pressing this button selects a font, and 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. NOTE: Selections of the FONT and CONDENSED buttons are stored as defaults, so that the last FONT and the CONDENSED selection become effective when the printer is initialized.
Page 164: Dip Switches And Jumper Setting
1.5 DIP SWITCHES AND JUMPER SETTING This section describes the DIP switch selections and jumper setting for the LQ-570 printer. 1.5.1 DIP Switch Settings The two DIP switch banks for the printer, located on control panel, function as shown in tables l-l 2 through l-l 5.
Page 165: Jumper Setting
REV.-A 1-14. International Character Set Selection Country U.S. 8 5 0 France 8 6 0 Germany U.K. 8 6 3 Denmark 1 ‘437 Sweden Italy Spain 1 When SW l-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 0, country setting becomes U.S.
Page 166: Hexadecimal Dump Function
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 167: Paper-Out Detection And Forms Override Function
1.6.3 Paper-out Detection and Forms Override Function 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 168: 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 169: 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 170 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 PAUSE RUNNING position. The paper advances to the tear-off position whether the printer is in 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 171: Printer Protection For Heavy-Duty Printing
REV.-A 1.6.11 Printer Protection for Heavy-Duty Printing 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. Printing resumes at a lower print speed at first.
Page 172: Main Components
REV.-B 1.7 MAIN COMPONENTS The main components of the LQ-570/1070 printers are designed for easy removal and replacement to maintain and repair the printer. The main components are: 1) CO62 MAIN board: the main control board; the CPU on this board controls all main functions. 2) CO62 PNL board: the control panel board.
Page 173: C062 Pnl Board
REV.-B 1.7.2 C062 PNL Board (Control Panel Circuit Board) The CO62 PNL board is the LQ-570/1 070 control panel, which includes the indicator LEDs, switches, and DIP switches. 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 174: Printer Mechanism (M-5E10/M-5E60)
REV.-B 1.7.4 Printer Mechanism (M-5E10/M-5E60) The M-5ElO/M-5E60 printer mechanism was developed specifically for use with LQ-570/1070 printer. The components include a carriage motor, carriage mechanism, paper-feed motor, paper-feed mechanism, ribbon-feed mechanism, printhead, and sensors. This printer mechanism allows three ways of paper insertion.
Page 175 REV.-B CHAPTER 2 OPERATION PRINCIPLES 2.1 OVERVIEW OF PRINTER M E C H A N I S M OPERATION....2-1 2.1.1 Printhead Mechanism .............. 2-1 Carriage Movement Mechanism.......... 2-2 2.1.2 Paper Feed Mechanism............2-3 2.1.3 2.1.3.1 Paper Advance Mechanisms........2-3 2.1.3.2 Paper Insertion Entrances ...........
Page 176 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. Ribbon Advance Mechanism..........2-10 Figure 2-16.
Page 177: Overview Of Printer Mechanism Operation
REV.-B 2.1 OVERVIEW OF PRINTER MECHANISM OPERATION This section describes the of the Model-5ElOI5E60 printer unit and explains PRINTER MECHANISM how the printer works. The Model-5El0/5E60 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 178: 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 179: 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 tractor, and using the push and pull tractors together.
Page 180 REV.-B Push Tractor Method 17 (Tractor gear) on When the push tractor is selected, the SPUR GEAR, 16 engages the SPUR GEAR, 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 181 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 the paper through the PRINTER MECHANISM. Pull tractor feed, however, has the opposite arrangement, with the tractor situated after the paper entrance.
Page 182: 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 183 REV.-B Rear entrance paper insertion When you feed paper into the printer through the rear entrance, the method to advance the paper can be: the push tractor, or the push-pull tractor. The rear paper-out detector senses when the paper- has run out.
Page 184 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 TRACTOR ASSY. Paper Feed Roller DETECTOR ASSY., PE, FRONT From Bottom Insertion Figure 2-12.
Page 185 REV.-B Front entrance paper insertion When you feed paper into the printer through the front entrance, the paper can be advanced either paper runs out. with friction feed or the pull tractor. The front paper-out detector senses when the EJECT ROLLER ASSY., PAPER PF Drive Roller DETECTOR ASSY., PE, FRONT...
Page 186: Ribbon Advance Mechanism
REV.-B 2.1.4 Ribbon Advance Mechanism 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. Table 2-2. Ribbon Advance Gear Linkage Direction PULLEY, DRIVEN Left to right (arrow...
Page 187: 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 CO62 PSB board or the 2201240 V CO62 PSE board. The only difference in the way these two boards operate is in the primary circuitry.
Page 188 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 189: Control Circuit Operation
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 190 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 191: Reset Circuit
REV.-B Table 2-5. Functions of the Main IC and Circuits (Cont.) drive circuits for the printhead, MOTORCR STK-6022B This is a single chip that houses and MOTOR, PF of the PRINTER MECHANISM. The chip also includes the various sensor input circuits for the PRINTER MECHANISM. contains the program that runs the CPU.
Page 192: Sensor Circuits
REV.-A Power On CPU Self Reset VCCON DISC THLD RESET 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 193: Motor, Cr Drive Circuit
REV.-B 2.3.4 MOTOR, CR Drive Circuit Figure 2-22 shows the MOTOR, circuit. An open-loop, constant-current drive arrangement is CR drive used for running the MOTOR, CR. The motor is driven by 2.2 phase excitation and l-2 phase excitation. 2-2 phase excitation corresponds to two l-2 phase excitation steps. Thus, for each single step phase change of a 2-2 phase excitation motor, the carriage moves l/l 20 inch.
Page 194 REV.-B I 2.3.5 MOTOR, PF Drive Circuit motor to advance the paper. The minimum amount of paper that can be The printer uses a stepping advanced is l/360 inch. The motor is a 2-2 phase or l-2 phase, constant-voltage drive type. P70 to these ports.
Page 195: 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 this data three times and transfers this information to the latch circuit within the STK-6022B’. The CPU samples the voltage of the +35 V line via the A/D convertor (see Section 2.3.3).
Page 196: Parallel Interface Circuit
REV.-A 2.3.7 Parallel Interface Circuit Figure 2-26 shows the parallel interface circuit in block diagram form. The data sent from the host computer is latched within E05A50 by the STROBE signal. E05A50 outputs the BUSY signal automatically to stop the host computer from sending the next data and then outputs the IBF signal for the CPU.
Page 197 REV.-B CHAPTER 3 DISASSEMBLY AND ASSEMBLY 3.1 OVERVIEW ....................3-1 Precautions for Disassembling the Printer...... 3-1 3.1.1 3.1.2 Tools ....................3-1 3.1.3 Service Checks After Repair ..........3-2 3.1.4 Specifications for Screws ............3-3 3.2 DISASSEMBLY AND ASSEMBLY ............. 3-4 Changing the Printhead..
Page 198 REV.-B LIST OF FIGURES Flowchart for Disassembling the Printer ..... . 3-4 Figure 3-1. Figure 3.2. Removing the Printer Cover and the Paper Eject Cover ............
Page 199: Overview
REV.-A 3.1 OVERVIEW This section describes the various points to note when disassembling and assembling the printer. 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 200: 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, use the checklist shown in a record to make servicing Table 33 to note the current state of the components. This checklist provides and shipping more efficient.
Page 201: 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 Name Abbreviation CBS(C) Cross-recessed Bind head Cone point S tight screw Cross-recessed Bind head Cone point B tight screw Cross-recessed Bind head screw CBS(O)
Page 202: 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 203: Changing The Printhead
REV.-B 3.2.1 Changing the Printhead 1. Remove the FRAME ASSY., SHEET GUIDE. 2. Remove the COVER ASSY., EJECT. FRAME ASSY., SHEET GUIDE COVER ASSY., EJECT (This illustration shows the LQ-570, an 80column printer. The difference between the LQ-570 and LQ-1070 is in carriage width only.) Figure 3-2.
Page 204: Removing The Printer Case
REV.-B Case 3.2.2 Removing Printer This section describes how to remove the front case and HOUSING ASSY., UPPER. 3.2.2.1 Removing the HOUSING, 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 205: Removing The Circuit Boards
REV.-B 3.2.3 Removing the Circuit Boards This section describes how to remove the BOARD ASSY., MAIN (CO62 MAIN board), the BOARD ASSY., POWER SUPPLY (CO62 PSB/PSE board) and the BOARD ASSY., PANEL (CO62 PNL board). 3.2.3.1 Removing the BOARD ASSY., MAIN (C062 MAIN Board) 1.
Page 206: Removing The Board Assy., Power Supply
REV.-B 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. Remove the HOUSING ASSY., UPPER (see Section 3.2.2.2). 2.
Page 207: 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 (M3X6) 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 208: 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 209: 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. 3. Release the two clips holding the MOTOR, PF to the FRAME, MAIN, RIGHT. 4.
Page 210: Removing The Carriage
REV.-B 3.2.5.4 Removing the Carriage 1. Remove the FFC (CABLE, HEAD, FRONT (,REAR)) (see Section 3.2.5.3). 2. Remove the TIMING BELT from the carriage. 3. Use the box driver to rotate and free the adjusting bushing. This bushing holds the SHAFT, CR, GUIDE to the FRAME, MAIN, RIGHT.
Page 211: Removing The Platen
REV.-B 3.2.5.5 Removing the PLATEN the PRINTER MECHANISM from the HOUSING ASSY., LOWER (see Section 3.2.4). Remove 2. Remove the two CBP(C) (M3X 10) screws that hold the COVER, PLATEN, LOWER to the left and FRAME, MAIN, RIGHT. Remove the COVER, PLATEN, LOWER. 3.
Page 212: Removing And Disassembling The Frame, Main, Right
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). 2. Remove the PLATEN from the PRINTER MECHANISM (see Section 3.2.5.5). 3. Remove the MOTOR, CR from the FRAME, MAIN, BASE (see Section 3.2.5.1). 4.
Page 213: Removing And Disassembling The Paper Guide
REV.-B 3.2.5.7 Removing and Disassembling the PAPER GUIDE (Including the DETECTOR ASSY., HP) 1. 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 214 REV.-B PF lever assemblies and the compression spring (1300 gm) 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. LEVER ASSY., PF (This illustration shows the LQ-570, an 80column printer.
Page 215: Removing The 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 DETECTOR ASSY., HP. Remove the DETECTOR ASSY., HP from the rear of the FRAME, MAIN, BASE. Figure 3-23.
Page 216: 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., PE, FRONT FRAME, MAIN, ‘BASE...
Page 217: Disassembling The Tractor Assy
REV.-B 3.2.5.12 Disassembling the TRACTOR ASSY. 1. Remove the TRACTOR ASSY. from the printer. 2. Remove the SPUR GEAR, 17 from the SHAFT, TRACTOR. 3. Remove the FRAME, TRACTOR, RIGHT from the SHAFT, TRACTOR and the SHAFT, TRACTOR, GUIDE. 4. Remove RETAINING RING from the SHAFT, TRACTOR. 5.
Page 218: Arranging The Cables
REV.-B 3.2.5.13 Arranging the Cables Figure 3-28 shows how the cables are for the PRINTER MECHANISM. When assembling the arranged printer, make sure that the cables are laid out as shown in this figure. PRINTER MECHANISM (Bottom) (This illustration shows the LQ-570, an 80-column printer.) Figure 3-28.
Page 219 REV.-B CHAPTER 4 ADJUSTMENTS 4.1 ADJUSTING THE PRINTER M E C H A N I S M ........4-1 ........4.1.1 MOTOR, CR Backlash Adjustment.. 4.1.2 Platen Gap Adjustment .............. 4-2 4.2 BIDIRECTIONAL PRINT POSITION ADJUSTMENT..... 4-4 4.2.1 Overview of Bidirectional Print Position Adjustment ..4-4 4.2.2 Bidirectional Print Position Adjustment Procedure ..
Page 220: 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. 4.1.1 MOTOR, CR Backlash Adjustment In the MOTOR, CR backlash adjustment, the pinion gear of the MOTOR, CR is meshed smoothly with the BELT PULLEY cog.
Page 221: 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. 1. Remove the PRINTER MECHANISM from the HOUSING ASSY., LOWER (see Section 3.2.4). 2.
Page 222 REV.-B 9. Rotate the adjusting bushing until the platen gap is large enough for a thickness gauge of 0.44 mm thickness but too narrow for one of 0.47 mm thickness. 0.45 PLATEN Printhead Figure 4-4. Platen Gap 10. Move the carriage until the edge of the printhead is at the 75th column print position. 1 1.
Page 223: 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 224 REV.-A Are the characters aligned vertically? NO -+ GO TO STEP 3. YES - GO TO STEP 4. 3. Referring the odd-numbered lines (1st and 3rd), adjust the even-numbered lines (2nd and 4th). If the even-numbered lines are shifted to the left: and even lines shift to the right.) 4.
Page 225: Circuit Adjustment
REV.-B 4.3 CIRCUIT ADJUSTMENT balancing the circuitry. When any of the following parts are replaced, the circuitry must be balanced again by adjusting this variable resistance: R14, R15, R13, C8, and VRl 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 226 REV.-B CHAPTER 5 TROUBLESHOOTING OVERVIEW ....................5-1 5.2 REPAIR BY UNIT REPLACEMENT............ 5-2 5.3 REPAIR OF THE BOARD ASSY., MAIN (C062 MAIN BOARD) ................5-14 REPAIR OF THE PRINTER MECHANISM........5-17 LIST OF FIGURES Troubleshooting Procedure ..........5-1 Figure 5-1.
Page 227 REV.-B 5.1 OVERVIEW Problems in the printer may exhibit can complicate the task of a variety of symptoms, which troubleshooting, unless you follow the procedure shown in the flowchart below. Repair of the Repair of the printer BOARD ASSY., MAIN mechanism Figure 5-1.
Page 228 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 229 REV.-B (1) Printer Fails to Operate when Power is On fuse Fl on the Power Supply board from the Power Supply board. output voltage Replace the BOARD ASSY., POWER SUPPLY. fault corrected? Replace the PRINTER MECHANISM. 5 - 3...
Page 230 REV.-B (2) Carriage Operation is Abnormal C N 7 connecting the BOARD ASSY., connecting the BOARD ASSY., MAIN MAIN and the and the PRINTER PRINTER Secure connectors. Secure connectors. fault corrected? R e f e r t o s e c t i o n 5 . 5 . Repair of the PRINTER MECHANISM.
Page 231 REV.-B (3) Printing is Faulty During Self-Test, but Carriage Operation is Normal Set the head LEVER,G, ADJUST to the 2nd position, and perform s e l f - t e s t . and the PRINTER MECHANISM. and the PRINTER MECHANISM. inserted securely? inserted securely? Perform bidirectional...
Page 232 REV.-A Check printhead r e s i s t a n c e . Replace pluggable c h i p s . Replace printhead. Replace printhead and logic PCB. 5 - 6...
Page 233 REV.-A Replace printhead and PH cable. P e r f o r m f i n a l t e s t .
Page 234 REV.-A Coil Resistance: 45.5 k3.2 (Between each dot wire and commdn.) - - - - C O M . Figure 5-2. Printhead Resistance...
Page 235 REV.-B (4) Paper Feeding is Abnormal (but Printing is Normal) paper loaded correctly? Refer to section 5.5, Repair of the PRINTER MECHANISM. Replace the BOARD ASSY., MAIN. fault corrected? Refer section 5.5, Replace the BOARD ASSY., Repair of the PRINTER MAIN and the MOTOR, PF.
Page 236 REV.-A Check motor resistance. Check drivers. Replace defective Replace logic PCB. NOTE Replace motor and main logic board. NOTE P e r f o r m f i n a l t e s t . I / O c a b l e . NOTE P e r f o r m f i n a l t e s t .
Page 237 REV.-B Clean or replace. Check lefl and right tractor assemblies for proper phasing. Adjust phasin Inspect paper p a t h . Perform final test. 5-11...
Page 238 REV.-B (5) Control Panel Operation is Abnormal fault corrected? self-test executed Replace the BOARD ASSY., MAIN. fault corrected? Replace the BOARD ASSY., PANEL. 5-12...
Page 239 REV.-B (6) Printing of Data Sent by the Host Computer is Faulty It is assumed here that the host computer is operating normally. START P e r f o r m s e l f - t e s t p r i n t i n g . I s s e l f - t e s t Refer to other troubleshooting printing normal?
Page 240 REV.-B 5.3 REPAIR OF THE MAIN BOARD This section provides instructions for repairing the BOARD ASSY., MAIN 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.
Page 241 REV.-B Table 5-4. Repair of a Problem in the BOARD ASSY., MAIN (Cont.) Symptom Cause The CPU does Either ROM or The printer does not op- not operate. RAM is defective. erate at all. If a signal is Check the oscillator signal at either pin 33 The CPU is detected, re- or pin 34 of the CPU.
Page 242 REV.-B Table 5-4. Repair of a Problem in the BOARD ASSY., MAIN (Cont.) Self-test print- Self-test is The CPU can’t Measure the voltage at Vref (pin 1) of Adjust VRl. ing is not executed. measure the abnormal. voltage on the +35V line.
Page 243 REV.-B 5.4 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 symptom recurs following an attempted repair, refer to Table 5-5 to try to find other potential causes. Table 5-5.
Page 244 REV.-B Table 5-5. Repair of the PRINTER MECHANISM (Cont.) Problem Checkpoint Solution Symptom Cause Self-test printing is A particular dot The printhead is Measure the coil re- Replace the abnormal. sistance of the printhead. fails to print. defective. printhead. The nor- mal value is ap- proximately 45.5 ohms.
Page 245 REV.-B Table 5-5. Repair of the PRINTER MECHANISM (Cont.) Replace the ribbon The ribbon feed is The ribbon is not Dismount the rib- The ribbon car- abnormal. fed. tridge is defective. bon cartridge, ro- cartridge. tate its knob manu- ally, and check whether the ribbon feeds normally.
Page 246 REV.-B CHAPTER 6 MAINTENANCE PREVENTIVE MAINTENANCE ........LUBRICATION A N D ADHESIVE APPLICATION .
Page 247 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 248 REV.-A Table 6-2. Lubrication Points (Refer to Figure 6-2) G-26 G-26 G-26 Portion of carriage that contacts base frame G-26 Oil pad Portion of platen shaft that contacts ground spring G-20 G-26 Gear (40 mm) shaft Gear (8.5, 30 mm) shaft G-26 Ribbon-feed gear shafts G-26...
Page 249 REV.-A Figure 6-2. LQ-570 Lubrication Points...
Page 250 REV.-B Figure 6-3. LQ-1 070 Lubrication Points...
Page 251 REV.-B APPENDIX A.1 CONNECTOR S U M M A R Y ..............A-1 A.2 CIRCUIT DIAGRAMS ................A-5 A.3 CIRCUIT BOARD COMPONENT LAYOUT ........A-12 A.4 EXPLODED DIAGRAM................. A-16 A.5 CASE OUTLINE DRAWING..............A-20 LIST OF FIGURES Figure A-1. Cable Connections .
Page 252 REV.-B LIST OF TABLES Board Connector Summary............ A-2 Table A-1. Table A-2. CN2 BOARD ASSY., M A I N (C062 MAIN)......A-3 C N 3 BOARD ASSY., M A I N (C062 MAIN)......A-3 Table A-3. CN4 BOARD ASSY., M A I N (C062 MAIN)......A-3 Table A-4.
Page 253: Board Assy
REV.-B A.1 CONNECTOR SUMMARY Figure A-l illustrates the interconnection of the primary components. Table A-l summarizes the functions and sizes of the connectors. BOARD ASSY., Model 5E10/5E60 PRINTER MECHANISM G A P L E V E R C R H O M E P E - 2 CR MOTOR PF MOTOR HEAD HEAD...
Page 254 REV.-B Table A-l. Board Connector Summary Parallel interface Optional interface card MAIN (CO62 MAIN BOARD) Control panel MOTOR, CR MOTOR, PF Printhead Printhead DETECTOR ASSY., HP (HP sensor) DETECTOR ASSY., PE, REAR DETECTOR ASSY.,. PE, PRONT DETECTOR ASSY., PLATEN CN12 DETECTOR ASSY., RELEASE DC power input BOARD ASSY.,(POWER SUPPLy):(CO62 PSB/PSE board) CN13...
Page 255 N o . I/O MOTOR, CR phase B MOTOR, CR phase C MOTOR, CR phase D MOTOR, CR common 0 C R C O M Transmit data Ready to receive data Receive data No connection MOTOR, PF phase A Reset Inhibit MOTOR, PF phase C Command request...
Page 256 REV.-B Power switch signal Head data 1 1 Head data 2 Signal ground Head data 19 Signal ground Head data 7 Signal ground Common Signal ground Common Signal ground Common HD22 Head data 22 HD15 Head data 15 HD18 Head data 18 HD23 Head data 23 Head data 10...
Page 258 C 0 6 2 M A I N B o a r d Figure A.3. BOARD ASSY.. MAIN (C062 MAIN BOARD) Circuit Diagram...
Page 259 C 0 6 2 2 0 0 2 8 4 9...
Page 260 I‘ C O 6 2 P S B B o a r d 2 0 0 2 8 4 9...
Page 261 C062 PSE Board 2002850...
Page 262 C062 PSE Board 2002850...
Page 263 CO62 PNL Board ‘1 Excluding Japan...
Page 264 ...
Page 265 REV.-B C O 6 2 PSB TM, u$ ’ A S S Y . 2 0 0 2 8 4 9 0 0 Figure A-10. BOARD ASSY., POWER SUPPLY (C062 PSB BOARD) Component Layout A-13...
Page 266 REV.-B A S S Y 2 0 0 2 8 5 0 0 0 Figure A-11. BOARD ASSY., POWER SUPPLY (C062 PSE Board) Component Layout A-14...
Page 267 C O 6 2 P N L QW CM-YXT DIP 5.~1 A S S Y 2 0 0 2 8 5 2 0 0 ... , . I...
Page 269 REV.-B Figure A-14. LQ-1070 Exploded Diagram A-17...
Page 270 REV.-B Figure A-15. Model-5E10 Exploded Diagram A-18...
Page 271 REV.-B Figure A-16. Model-5E60 Exploded Diagram A-19...
Page 272 Table A-14. Part Number Reference Table Ref. Ref. Description Compression spring (200 gm) Lower housing assembly Plain washer (M5 x 16) Bottom shield plate Spur gear (40 mm) FFC holding plate I/F grounding plate Combination gear Printer front cover assembly Spur gear (13.2 mm) Sheet guide frame assembly RD ratchet...
Page 273 Table A-14. Part Number Reference Table (Cont.) Ref. Ref. Descrlptlon Descrlptlon Spur gear (17 mm) Paper tension spring Type Eretaining ring (5) CR guide shaft G adjustment lever Driven pulley Belt pulley flange Driven pulley shaft Plain washer (3.2 x 0.5 x 7) Front head cable Rear head cable CR grounding plate...
Page 274 REV.-A A.5 CASE OUTLINE DRAWING 3 6 8 Figure A-17. LQ-570 Case Outline Drawing A-22...
Page 275 REV.-B Figure A-18. LQ-1070 Case Outline Drawing A-23...
Page 276 Figure B-15. LQ-570+/1070+ Connection Diagram ..B-23 Figure B-16. Cl07 MAIN Board Component Layout ..B-29 Figure B-17. C107 MAIN Board Circuit Diagram ..B-31 Epson LQ-570+/1070+...
Page 277 Table B-24. C107 MAIN Board - CN12 ....B-28 Table B-25. C107 MAIN Board - CN13 ....B-28 B-ii Epson LQ-570+/1070+...
Page 278: Differences Between The Lq-570+/1070+ And The Lq-570/1070
LQ-570/1 070 1371164 17.1 LQ-570+/1 070+ 961204 LQ-57011 070 961204 LQ-570+/1 070+ LQ-57011 070 1601233 LQ-570+/1 070+ 1201272 LQ-57011 070 LQ-570+/1 070+ INVALID LQ-570/1 070 INVALID Note: HSD = high-speed draft. The LQ-570+/1 070+ has no high-speed draft. Epson LQ-570+/1070+...
Page 279 77.6 rns per l/6-inch (4.23 mm) feed 2.2 ips continuous Tractor (with Multipart Paper) LQ-1 070+ LQ-570 LQ-1070 Additional Scalable Fonts LQ-57011070 Epson Epson Roman Roman Epson Sans Serif+ Epson San Serif Epson Roman T Epson Roman H Epson LQ-570+/1070+...
Page 280: Character Table Differences
Italic (Using character set selected above.) PC 437 (U.S.) PC 850 (Multilingual) PC 860 (Portugal) PC 863 (Canadian-French) PC 865 (Norway) Abicomp (Brazilian Portuguese) OFF PC 437 (U.S.) Note: Listings in bold are for the LQ-570+/1070+ only. Epson LQ-570+/1 070+...
Page 281: Jumper Differences
Prints rotating pattern of LQ fonts settings, rotating pattern of LQ fonts LOAD/ Prints PROM version, DIP switch Prints draft font pattern EJECT settings, draft font pattern No function Prints PROM version and DIP switch settings and ejects page Epson LQ-570+/1 070+...
Page 282 The LQ-570+ and the LQ-1070+ use different versions of the Cl07 MAIN board. The differences between the boards are shown in the table below. Table B-7. Diffenznces in the Cl07 MAIN LQ-570+ LQ-1070+ IC16 (64K SRAM) Installed Not installed Installed installed IC 14 (PROM) WOO234 Epson LQ-570+/1 070+...
Page 283: 1070+ Control Circuit Operation
Figure B-2 shows the block diagram of the Cl07 Main Board. CO62 PNL Board PF Motor Rear PE Sensor Release Sensor HP Sensor Front PE Sensor Platen Gap !Senaor Figure B-2. Control Circuit Block Diagram Epson LQ-570+/1 070+...
Page 284 The head drive circuit then outputs the head drive signal. R A M Image Image Data Buffer Trigger Data output Data Latch and Delay control Figure B-3. Data Flow Epson LQ-570+/1 070+...
Page 285 Change order of the head pulse outputs Mode 1: HD~-oHD~*HD~..*HD~~=+HD~~*HD~~ Mode 2: HD24=+2HD2WHD22e..eHDMHD2*HDl Delay control (for low noise) Image data latching Vref Circuit This circuit generates the reference voftage used in the A/D converter within the CPU. Epson LQ-570+/1070+...
Page 286: Reset Circuit
C29 is then discharged. Af%er this, the /THLD port within Resets Performed by the CPU Itself (CPU Self-Reset) The CPU outputs the /RESET signal if there is a /RESET request for E05A50 and /OUT /DISC Figure B-4. Reset Circuit Block Diagram Epson LQ-570+/1 07o+...
Page 287 Appendix B CPU Self Reset Power On THLD Figure &5. B-10 Epson LQ-570+/1 070+...
Page 288: Sensor Circuits
- - - - C P U Vref Circuit 0.022 P E - 2 LEVER Sensor Circuit _ _ _ _ _ _ _’ Sensor Circuit Sensor Circuit l o - Figure B-6. Sensor Circuit Block Diagram Epson LQ-570+/1 070+ B-11...
Page 289: Cr Motor Drive Circuit
2-2 phase 1773 pps High speed LO 1.5 x speed 2-2 phase 1347 pps Draft (emphasized, condensed) l-2 phase 1191 pps 1 x speed l-2 phase 1796 pps l-2 phase 1347 pps 119opps l-2 phase 698 pps B-12 Epson LQ-570+/1 070+...
Page 290: Pf Motor Drive Circuit
+5 V. Switching between these two supply voltages occurs at the CP terminal of the PU1501 (IC3) when the switch is turned on or off. P 7 1 P3 . Data Figure B-8. PF Motor Drive Circuit Epson LQ-570+/1 070+ B-13...
Page 291: Printhead Drive Circuit
If the voltage of the +35 V line is HIGH, the CPU shortens the output pulse. If the voltage of the +35 V line is LOW, the CPU lengthens the output pulse. DO -D7 DO -D7 Printhead Figure B-9. Printhead Drive Circuit B-14 Epson LQ-570+/1...
Page 292: Disassembly Procedures Unique To The Lq-570+/1070
Then remove the main board. CAUTION Both connector CNll and CN12 are 2-pin connectors, so be careful not to them up when you connect them to the main board: BLACK WIRE AND WHITE WIRE: CNll GRAY WIRES: CN12 Epson LQ-570+/1 070+ B-15...
Page 293 Appendix B Main B&d Asembh/ CB (M3 X B)‘Screw After you have replaced the main board assembly, you must adjust the bidirectional print alignment. See Section 4.2 in the LQ-570/1070 Service Manual. Epson LQ-570+/1 070+ B-16...
Page 294 Note: The power supply is secured with a one-way screw that requires the special tool illustrated below for removal. Power supply Boald Special Tool CO62 PSB Power Supply Board Assembly B-12. Removing the Power Supply Board A s s e m b l y B-17 Epson LQ-570+/1 070+...
Page 295 Removing the C062 PNL Board Remove the front housing. (See Section 3.2.2.1.) 5 CBB(C) (M3 x 10) screws that hold the panel board assembly to the front housing. the panel board assembly. Remove Figure B-13. Removing the Panel Board Assembly B-18 Epson...
Page 296: Adjustments
If the circuitry is not properly adjusted, the CPU A/D converter functions abnormally and causes irregular printer operation. To adjust the circuit, attach a digital multimeter to check terminal TPl (Vref voltage) on the Cl07 MAIN board. Turn on the printer and adjust variable resistor Epson LQ-570+/1 070+ B-19...
Page 297: Troubleshooting
Common pins may be reversed for the PF motor. If you do not obtain a proper reading with one common, try the other common. (If you leave CN5 connected when you make the check, pins 5 and 6 are tied together.) B-20 Epson LQ-570+/1 070+...
Page 298: Error Codes
Illegal voltage from power supply circuit. ROMAN Paper feed motor control error. SANS SERIF Illegal thermistor resistance in printhead. (Also printhead not installed or broken.) PRESTIGE Firmware problem. SCRIPT Illegal data read from the character generator. Epson LQ-570+/1 070+ B-21...
Page 299 The figure below shows how printhead connector pins are assigned to the dot wires in the printhead. 0 a!5 0 iI7 0 a15 Coil Resistance: 45.5 k3.2 SI at 25’~ (Between each dot wire and common.) Figure B-14. Printhead Connector B-22 Epson LQ-570+/1 07o+...
Page 300: Reference Materials
M&J10 printer mechanism (for the LQ-570+) or M&J60 printer mechanism (for the LQ-1070+). GAP LEVER CRHOME PE-2 PE-1 QI YOTORPF MOTOil HEAD HEAD Black Wires While AC IN P a r a l l e l I/F i Specific I/F Figure B-15. LQ-570+/1070+ Connection Diagmm Epson LQ-570+/1 070+ B-23...
Page 301 Cl 07 Board Parallel interface Assembly Optional interface card Control panel CR motor PF motor Printhead Printhead HP sensor Rear PE sensor Front PE sensor Platen gap sensor CN12 Release lever sensor CN13 DC power input B-24 Epson LQ-570+/1 070+...
Page 302 Address bus bit 0 Data bus bit 7 Data bus bit 6 Data bus bit 5 Data bus bit 4 Data bus bit 3 Data bus bit 2 Data bus bit 1 Data bus bit 0 Epson LQ-570+/1 070+ B-25...
Page 303 Table B-l 7. Cl07 MAIN Board - CN5 Function Pin No. Signal Name PF motor phase A PF-A PF motor phase -A PF motor phase B PF-B PF motor phase -B PF motor common PFCOM PFCOM PF motor common B-26 Epson LQ-570+/1 070,...
Page 304 Common HD22 Head data 22 Head data 15 HD15 Head data 18 HD23 Head data 23 Head data 10 Head data 14 HD14 Head data 6 Table B-20. Cl07 MAIN Board - CN8 Signal Name Function Epson LQ-570+/1 070+ B-27...
Page 305 Pin No. Signal Name Function Platen gap sensor Signal ground Function Signal Name Release lever sensor LEVER Signal ground Signal Name Function Pin No. Power button signal Signal ground Signal ground Signal ground Signal ground Signal ground B-28 Epson LQ-570+/1 070+...
Page 306 Appendix B Epson LQ-570+/1 070+ B-29...
Page 307 Appendix B Figure B-l 7. Cl07 MAIN Board Circuit Diagram Epson LQ-570+/1 070+ B-31...

This manual is also suitable for:

Lg1-570

Epson LG1-1070 Service Manual

Table of Contents

Operation Principles

Chapter 1

Chapter 2 Operation Principles

Disassembly and Assembly

Adjustments

Chapter 3

Chapter 4

Chapter 5

General Description

Operation Principles

Disassembly and Assembly

Adjustments

Appendix B the Lq-570+/1070+

Quick Links

Chapters

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Summary of Contents for Epson LG1-1070