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Epson LQ-670 Service Manual

Impact dot matrix printer
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EPSON
IMPACT DOT MATRIX PRINTER
EPSON LQ-670

SERVICE MANUAL

SEIKO EPSON CORPORATION
4007875

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Summary of Contents for Epson LQ-670

  • Page 1: Service Manual

    EPSON IMPACT DOT MATRIX PRINTER EPSON LQ-670 SERVICE MANUAL SEIKO EPSON CORPORATION 4007875...
  • Page 2 However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them. ƒ The above notwithstanding SEIKO EPSON can assume no responsibility for any errors in this manual or the consequences thereof. EPSON is a registered trademark of SEIKO EPSON CORPORATION.
  • Page 3 POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS. CAUTION 1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY 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 product disassembly and assembly. CHAPTER 4. ADJUSTMENT Includes a step-by-step guide for adjustment. CHAPTER 5. TROUBLESHOOTING Provides EPSON-approved techniques for troubleshooting. CHAPTER 6. MAINTENANCE Describes preventive maintenance techniques and lists lubricants and adhesives required to service the equipment.
  • Page 5 REVISION SHEET Revision Issued Data Contents Rev. A May 28, 1997 First issue...
  • Page 6: Table Of Contents

    TABLE OF CONTENTS CHAPTER 1. GENERAL DESCRIPTION CHAPTER 2. OPERATING PRINCIPLES CHAPTER 3. DISASSEMBLY AND ASSEMBLY CHAPTER 4. ADJUSTMENT CHAPTER 5. TROUBLESHOOTING CHAPTER 6. MAINTENANCE APPENDIX...
  • Page 7 Chapter 1 Product Descriptions 1.1 Specifications .......................1-1 1.1.1 Features........................... 1-1 1.2 Hardware Specifications..................1-3 1.2.1 Printing Method ........................1-3 1.2.2 Printing Specifications......................1-4 1.2.3 Paper Handling Specifications....................1-5 1.2.4 Paper Specification ........................ 1-6 1.2.5 Printable Area ........................1-10 1.2.6 Ribbon Cartridge ........................1-14 1.2.7 Input data buffer ........................
  • Page 8: Specifications

    Chapter 1 Product Description 1.1 Specifications This specifications provide characteristics of the serial impact dot matrix printer LQ-670. 1.1.1 Features LQ-670 is a 24pin serial impact dot matrix printer for the VAR(value added reseller) market. The major features of this printer are; ‰Columns :106 columns (10cpi) ‰Printing Speed...
  • Page 9 LQ-670 Service Manual ‰Consumables and optional units Table 1-1. Consumables and Optional Units Name Part Number Ribbon cartridge S015016 High capacity cut sheet feeder (Bin1) C806781 (EAI version) High capacity cut sheet feeder (Bin1) C806782 (Non-EAI version) Second bin cut sheet feeder...
  • Page 10: Hardware Specifications

    Chapter 1 Product Description 1.2 Hardware Specifications This section describes hardware specification for the LQ-670. 1.2.1 Printing Method ‰Printing Method : Impact dot matrix ‰Number of pins : 24 pins ‰Print pin arrangement : 12x2 staggered ‰Print pin diameter : 0.0079 inch (0.20 mm) ‰Color : Black ‰Print direction...
  • Page 11: Printing Specifications

    LQ-670 Service Manual 1.2.2 Printing Specifications ‰Copy capability :1 original + 4 copies ‰Print speed and printable columns Table 1-2. Print Speed and Printable Columns Printing Mode Character Pitch Printable Columns Print Speed(cps) Normal Copy High speed Draft 10cpi Draft...
  • Page 12: Paper Handling Specifications

    Chapter 1 Product Description 1.2.3 Paper Handling Specifications ‰Feeding method :Friction feed (front manual, rear CSF) Push tractor feed (rear) ‰Feeder :Rear push tractor CSF Bin1/Bin2 (Option) Roll paper holder(Option) ‰Paper path :Manual Insertion Front in, front out Rear in, front out Tractor Rear in, front out ‰Line Spacing...
  • Page 13: Paper Specification

    LQ-670 Service Manual 1.2.4 Paper Specification This section describes printable area and types of paper that can be used in this printer. ‰Cut Sheets The following table shows specification for cut sheets. Table 1-7. Cut Sheet (Single sheet, Not Multi Part)
  • Page 14 Chapter 1 Product Description ‰Envelope Table 1-9. Envelope Specification Front Entry (Manual Insertion) Rear Entry (CSF) Minimum Maximum Minimum Maximum Envelope Width (inch) (No.6) (mm) Length (inch) (mm) Envelope Width (inch) (No.10) (mm) Length (inch) (mm) Total thickness (inch) 0.0063 0.0197 0.0063 0.0197...
  • Page 15 LQ-670 Service Manual ‰Continuous paper (Single sheet and Multi part) Table 1-11. Continuous Paper (Single Sheet and Multi Part) Rear Entry (Tractor) Minimum Maximum Width (inch) (mm) 101.6 304.8 Length(one page) (inch) (mm) 101.6 558.8 Copies 1 original + 4 copies...
  • Page 16 Chapter 1 Product Description ‰Roll paper Table 1-13. Roll Paper Specification Rear Entry (Roll paper holder) Minimum Maximum Width (inch) (mm) Length (inch) ----- (mm) Thickness (inch) 0.0028 0.0035 (mm) 0.07 0.09 Weight (g/m (lb) Quality Plain paper, Reclaimed paper. Not curled, not folded, not crumpled.
  • Page 17: Printable Area

    LQ-670 Service Manual 1.2.5 Printable Area ‰Cut sheets Figure 1-4. Printable Area for Cut Sheet Table 1-14. Printable Area for Cut Sheet Single sheet Multi part (Width) (Refer to section 1.2.4) (Refer to section 1.2.4) (Length) (Refer to section 1.2.4) (Refer to section 1.2.4)
  • Page 18 Chapter 1 Product Description ‰Envelope and card Figure 1-5. Printable Area for Envelope Figure 1-6. Printable Area for Card Table 1-15. Printable Area for Envelope and Card Envelope Card (Width) (Refer to section 1.2.4) (Refer to section 1.2.4) (Length) (Refer to section 1.2.4) (Refer to section 1.2.4) (Left margin) 3 mm or more...
  • Page 19 LQ-670 Service Manual ‰Continuous paper Figure 1-7. Printable Area for Continuous Paper Table 1-16. Printable Area for Continuous Paper Continuous paper (Width) (Refer to section 1.2.4) (Length) (Refer to section 1.2.4) (Left margin) 13mm or more (Right margin) 13mm or more (Top margin) 4.2mm or more...
  • Page 20 Chapter 1 Product Description ‰Roll paper Figure 1-8. Printable Area for Roll Paper Table 1-17. Printable Area for Roll Paper Continuous paper (Width) (Refer to section 1.2.4) (Length) (Refer to section1.2.4) (Left margin) 3mm or more (Right margin) 3mm or more (Top margin) 0.0mm or more (Bottom margin)
  • Page 21: Ribbon Cartridge

    LQ-670 Service Manual 1.2.6 Ribbon Cartridge ‰Type : Fabric ‰Color : Black ‰Ribbon life : 2 million characters (LQ 10cpi, 48 dots/character) ‰Dimensions :120.5mm(W) x 101.5mm(D) x 23.5mm(H) 1.2.7 Input data buffer ‰0 Kbyte or 64 Kbyte* Note*) : Depends on default settings.
  • Page 22: Environmental Condition

    Chapter 1 Product Description 1.2.10 Environmental Condition ‰Temperature „Operating : 5 to 35 C(without condensation) : 15 to 25 C (without condensation and during printing on multi part paper, envelope, card or label) „Non-operating : 30 to 60 C ‰Humidity „Operating : 10 to 80% RH (without condensation) : 30 to 60% RH (without condensation and during printing on multi part...
  • Page 23: Firmware Specification

    10CPI, Proportional :Scalable font EPSON Roman 10.5pt., 8pt.-32pt.(every 2pt.) EPSON Sans Serif 10.5pt., 8pt.-32pt.(every 2pt.) EPSON Roman T 10.5pt., 8pt.-32pt.(every 2pt.) EPSON Sans Serif H 10.5pt., 8pt.-32pt.(every 2pt.) :Bar code Ean-13 EAN-8 Interleaved 2 of 5 UPC-A UPC-E Code 39...
  • Page 24 EPSON Draft EPSON Roman Italic table EPSON Roman EPSON Sans Serif PC437(US Standard Europe) EPSON Sans Serif EPSON Roman T PC850(Multilingual) EPSON Courier EPSON Sans Serif H PC860(Portuguese) EPSON Prestige PC861(Icelandic) EPSON Script PC863(Canadian-French) EPSON OCR-B PC865(Nordic) EPSON Orator Abicomp...
  • Page 25: Interface Specification

    LQ-670 Service Manual 1.3.2 Interface Specification This printer provides bi-directional 8-bit parallel interface and Type-B optional interface slot as standard. 1.3.2.1 Parallel interface (Forward channel) [Transmission mode] : 8 bit parallel, IEEE-1284 compatibility mode [Adaptable connector] : 57-30360 (Amphenol) or equivalent...
  • Page 26 Chapter 1 Product Description BUSY signal is active (high level) under the following conditions. †In the process of receiving data. †In the condition of being input buffer full †In the condition of being /INIT signal active(low level) †During hardware initialization †In the condition of being /ERROR or PE signal active(low level, high level, respectively) †In the self test mode †In the adjustment mode...
  • Page 27: Parallel Interface (Reverse Channel)

    LQ-670 Service Manual 1.3.2.2 Parallel Interface (Reverse channel) [Transmission mode] : IEEE 1284 nibble mode [Adaptable connector] : 57-30360(Amphenol) or equivalent [Synchronization] : /STROBE pulse [Handshaking] : BUSY and /ACKNLG signals [Signal Level] : IEEE-1284 level 1 device TTL compatible...
  • Page 28: Optional Interface

    Chapter 1 Product Description 1.3.2.3 Optional Interface Type-B optional interface cards are available. Table 1-22. Optional Interface Reply message ESC/P2 IBM 2390 Plus Main-Type MT24p,PW106cl10cpi,PRG(W0xxxx)rev MT24p,PW106c110cpi,PRG(W0xxxx)rev Product-Name LQ-670 LQ-670 Emulation-Type ESCPL2-00 PRPXL24-01 Entity-Type EPSONLQ2 EPSONPRPXL24 1.3.2.4 Interface Selection The printer has 2 interfaces; the parallel interface and Type B optional interface. These interfaces are selected manually by Default setting or selected automatically.
  • Page 29: Operation

    LQ-670 Service Manual 1.4 Operation 1.4.1 Control Panel There are 7 switches and 8 LEDs on the panel as shown below. Figure 1-10. Control Panel 1.4.1.1 Usual Operation ‰Operate This switch turns the printer on and off. It is the secondary switch.
  • Page 30 Chapter 1 Product Description ‰Bin Pressing it selects CSF bin number or the Card mode* when cut sheet is used. Note*) Card mode is for using post card or envelope. ‰Font Pressing it selects one of following fonts. Draft, Roman, Sans serif, Courier, Prestige, Script and Others *. Note*) Others means the font selected in the Default Setting Mode.
  • Page 31: Switches

    LQ-670 Service Manual 1.4.1.2 Switches ‰Operation in normal mode In normal mode, pressing panel switches executes following function. Table 1-23. Operation in Normal Mode Switch Function Operate Turn the printer on and off. Pause Alternates printing and no-printing status. Enables Micro Adjust function, holding it down for 3 seconds.
  • Page 32: Indicators(Led)

    Chapter 1 Product Description 1.4.1.3 Indicators(LED) This printer displays present conditions and errors on the indicators. ‰Indication in normal mode Table 1-26. LED Indicators Pause Paper Out Tear Off/Bin Condensed Font Printer Status Pause Paper out error Paper jam Blink error Paper eject Blink...
  • Page 33: Buzzer

    LQ-670 Service Manual 1.4.1.4 Buzzer When the printer detects errors, it displays errors on the LEDs and also the buzzer beeps as warning sign. Table 1-27. Buzzer Warning sign Beeper sounds Paper out error Paper jam error Paper eject error...
  • Page 34: Default Setting

    Chapter 1 Product Description 1.4.2 Default Setting ‰Setting Method Several printer settings loaded at each power-on can be changed in this operation. The method is described in the guidance sheets (language selection sheet and printer setting sheet) which are printed out at first in the setting mode if desired. User is requested to operate 2 switches watching 6 LEDs on the control panel.
  • Page 35: Bi-D Adjustment

    LQ-670 Service Manual Note*1): One of these fonts selected in the default setting is corresponding to others(=other fonts) on the control panel. Following fonts are not selected in the default setting mode. Draft, Roman, Sans serif, Courier, Prestige and Script Note*2) : These settings are effective when IBM 2390 Plus emulation is selected.
  • Page 36: Initialization

    Chapter 1 Product Description 1.4.4 Initialization ‰Power-On initialization The initialization of this level is activated by power-on or cold reset command(remote RS command). This initialization is; „to initialize the printer mechanism. „to execute Operator initialization. ‰Operator Initialization The initialization of this level is activated by /INIT signal(negative pulse). This initialization is; „to clear the all buffers of data.
  • Page 37: Main Components

    LQ-670 Service Manual 1.5 Main Components This printer consists of the following components. ‰C214MAIN Board ‰C214 PSB/PSE Board ‰C214 PNL Board ‰Printer Mechanism(M-5060) ‰Housing 1.5.1 C214 Main Board This main board consists of 16bitCPU TMP96C041AF (IC11) which is driven by 17.20MHz clock drive...
  • Page 38: C214 Pnl Board

    Chapter 1 Product Description 1.5.3 C214 PNL Board This panel board consists of one switch as power switch, 6 non lock type switches and 8 LEDs. 1.5.4 Printer Mechanism This unit consists of carriage mechanism, paper feed mechanism, cut sheet/transformer change over mechanism, platen gap adjustment mechanism and print head.
  • Page 39 Chapter 2 Operating Principles 2.1 Printer Mechanism Operation................2-1 2.1.1 Printing Mechanism ....................... 2-1 2.1.2 Carriage Mechanism ......................2-3 2.1.3 Ribbon Advance Mechanism....................2-5 2.1.4 Paper Advance Mechanism ....................2-6 2.1.4.1 Paper Advance Mechanism ..................2-6 2.1.4.2 Paper Advance Detector Mechanism................ 2-7 2.1.4.3 Release Lever Mechanism..................
  • Page 40: Printer Mechanism Operation

    LQ-670 Service Manual 2.1 Printer Mechanism Operation This section describes the printer mechanism(M-5060) and explains how it works. 2.1.1 Printing Mechanism The printing mechanism of this printer is composed of head, ink ribbon and ribbon mask. The print head is an 24-pin(12pins X 2) head for impact dot printing.(Refer to Chapter 1) Each wire has its own drive coil.
  • Page 41: Operating Principles

    Chapter 2 Operating Principles Table 2-1. Print Head Specification Category Specification Print Method Impact dot matrix Number of pin wires 24-pin (12X2) Wire diameter 0.20mm Print head life 200 million strokes/wire Weight Coil direct current resistance 39.3 (at 25 C) Response Frequency Normal Mode : 1500Hz Buzzer...
  • Page 42: Carriage Mechanism

    LQ-670 Service Manual 2.1.2 Carriage Mechanism Carriage Mechanism consists of the carriage movement mechanism and platen gap adjustment mechanism. ‰Carriage Movement Mechanism  The figure below shows carriage mechanism. The top of the carriage is supported by the CR guide frame, and down side is by the CR guide shaft.
  • Page 43 Chapter 2 Operating Principles Table 2-3. CR Motor Specification Category Specification Type 200-pole, HB-type Stepping motor Coil Resistance Drive Voltage 42V 5% Drive Resolution 0.106mm/step (1-2 phase) Drive Method Constant current drive 1-2 phase, W1-2 phase Current Consumption Rated speed : 0.68A/phase At the waiting mode : 0.2A/phase...
  • Page 44: Ribbon Advance Mechanism

    LQ-670 Service Manual 2.1.3 Ribbon Advance Mechanism The ribbon advance mechanism consists of the rack mounted on the carriage guide frame, the pinion mounted on the carriage unit, planetary gear, combination gear and ratchet RD. When the carriage unit is moved right and left on the carriage guide shaft by the CR motor, the pinion is rotated by the rack and the motive power is conveyed to the planetary gear.
  • Page 45: Paper Advance Mechanism

    Chapter 2 Operating Principles 2.1.4 Paper Advance Mechanism The paper feed mechanism of this printer consists of the platen roller, paper feed roller, paper eject roller, PF motor, tractor unit, PW detector, PE (rear/front) detectors, release detector, and CSF mechanism(option). This printer performs paper advance by moving the paper horizontally. Figure 2-4.
  • Page 46: Paper Advance Detector Mechanism

    LQ-670 Service Manual 2.1.4.2 Paper Advance Detector Mechanism Paper advance detector mechanism consists of PW detector and PE (rear/front) detectors. The function of this mechanism is to feedback information about monitoring paper edges, paper width and paper jam, and to control paper advance. The detector’s reading operation is constantly performed. The timing to feedback the red signals is necessarily selected by CPU according to the operation of PF motor and CR motor.
  • Page 47 Chapter 2 Operating Principles Table 2-6. Front Paper End Detector Category Specification Type Mechanism type Switch Rating 0.6 1.0mA, 5VDC Switch Mode Paper in : Open Paper out : Close Table 2-7. Rear Paper End Detector Category Specification Type Mechanism type Switch Rating 0.6 1.0mA, 5VDC Switch Mode...
  • Page 48: Release Lever Mechanism

    LQ-670 Service Manual 2.1.4.3 Release Lever Mechanism Release lever mechanism consists of the release lever, tractor transmission gear and the release detector. The setting of the release lever enables to add or release the pressure to the paper advance rollers and also to change over the tractor drive(continuous paper mode) which can be done by releasing or conveying the driving force of the PF motor to the tractor transmission gear and tractor gear, and the friction drive(cut sheet mode).
  • Page 49: Platen Gap Adjustment

    Chapter 2 Operating Principles 2.1.5 Platen Gap Adjustment Platen gap (the gap between platen surface and print head) allows the printer to use different thickness of paper by setting appropriate gap so that the different thickness of paper can avoid getting printing dirt or picking the ribbon accidentally.
  • Page 50: Power Supply Operation

    LQ-670 Service Manual 2.2 Power Supply Operation 2.2.1 Power Supply Circuit The power supply part of this printer consists of AC cable and power supply board. The power supply board provides CD current, which is necessary for the printer mechanism and control circuit. There are two kinds of board according to the input voltage;...
  • Page 51: Power Supply Circuit Operation

    Chapter 2 Operating Principles 2.2.1.2 Power Supply Circuit Operation In the power supply circuit, at first, the input AC power goes to the filter circuit, where removes the noise, and goes to the diode bridge for full-wave rectification and is smoothed by the electrolytic capacitor. Then it goes to the switching regulator on the primary side.
  • Page 52: Control Circuit

    LQ-670 Service Manual 2.2.2 Control Circuit This section describes main function of the control circuit. The main circuit is mounted on the C214 main board. 2.2.2.1 Operating Principles of the Control Circuit This printer’s control circuit includes a TM96C041AFCPU that runs at 17.20MHz, an E05B42 gate array, a 8M PROM, or 2M/4M Flash-ROM, 1M PS-RAM, 32M MROM, EEPROM, Reset IC and various drive elements.
  • Page 53: Eeprom Control Circuit

    Chapter 2 Operating Principles 2.2.2.2 EEPROM Control Circuit EEPROM(IC9) uses three lines serial in/output 1kbit EEPROM and records default setting values and destination parameter. Control signals of EEPROM; CS,CK,DO, DI are attached in the CPU port P70 73 and, are controlled. When the power off is detected, the CPU writes the necessary data to the EEPROM before the +5V line drops out of the normal range.
  • Page 54: Power Off Detector Circuit

    LQ-670 Service Manual 2.2.2.4 Power Off Detector Circuit Power-Down signal from the power supply board is sent to the port INTO of the CPU. The CPU initializes the port P26 and sends a signal to the manual reset port MRES in the Reset IC(IC12) in order to let IC12 to output the reset signal.(Refer to Figure 2-9) When the Power Down signal breaks into during the waiting...
  • Page 55: Cr Motor Driver Circuit

    Chapter 2 Operating Principles 2.2.2.6 CR Motor Driver Circuit The CR motor driver circuit of this printer consists of CPU, gate array, CR motor drive IC SLA7024M (IC3) and CR motor. The CPU sends phase data; INA, /INA, INB and/INB from the port PGO0-3 to the CR motor IC.
  • Page 56: Operation Panel Control Circuit

    LQ-670 Service Manual 2.2.2.8 Operation Panel Control Circuit The panel control circuit consists of panel switches and gate array. The gate array detects the switch condition by the port SW0-SW5 and controls LED by LED0-9. Also, the POWER OFF signal(PSC) by the power switch on the operation panel is directly sent to the power supply circuit.
  • Page 57: Interface(I/F) Circuit

    Chapter 2 Operating Principles 2.2.2.9 Interface(I/F) Circuit The interface of this printer consists of gate array, parallel I/F connector and optional type-B I/F connector. Input of parallel I/F is pulled up by 3.3K resistance and goes to 10 resistance, which is serially connected to the port DIN0-7 of the gate array.
  • Page 58: Disassembly And Assembly

    Chapter 3 Disassembly and Assembly 3.1 Overview....................3-1 3.1.1 Precautions for Disassembling the Printer ......3-1 3.1.2 Tools ................... 3-1 3.1.3 Service Check After Repair ............3-2 3.1.4 Specifications for Screws............3-3 3.2 Printer Disassembly and Assembly........... 3-4 3.2.1 HOUSING, UPPER Removal ............3-5 3.2.2 Printer Mechanism Removal .............
  • Page 59 3.2.16 DETECTOR, HP Removal............3-24 3.2.17 DETECTOR, PG Removal............3-24 3.2.18 DETECTOR, REL Removal............. 3-24 3.2.19 DETECTOR, PE, FRONT Removal......... 3-25 3.2.20 DETECTOR, PE, REAR Removal ........... 3-26 3.2.21 LEVER, RELEASE Removal........... 3-27 3.2.22 Tractor ASSY. Removal ............3-28...
  • Page 60: Overview

    Chapter 3 Disassembly and Assembly 3.1 Overview This section describes procedures for disassembling the main components of EPSON LQ- 670. Unless otherwise specified, disassembled units or components can be reassembled by reversing the disassembly procedure. Therefore, no assembly procedures are included in this section.
  • Page 61: Service Check After Repair

    LQ-670 Service Manual 3.1.3 Service Check After Repair After completing repair of the product, use the check list shown below, to verify status of repaired product and all the repair work performed before returning the product to the users. This list can be used as a record of all service work performed with the product.
  • Page 62: Specifications For Screws

    Chapter 3 Disassembly and Assembly 3.1.4 Specifications for Screws The table below lists the abbreviations used in this manual for small parts, such as screws and washers. Table 3-3. Abbreviations and Screw Type Abbreviation Description Screw Type Cross-recessed Bind-head Screw Cross-recessed Bind-head S-Tight Screw...
  • Page 63: Printer Disassembly And Assembly

    LQ-670 Service Manual 3.2 Printer Disassembly and Assembly This section describes procedures for disassembling the main components of the printer. Since re-assembling the printer can be done by simply performing the disassembly procedures in reverse order, this chapter does not describe the assembly procedures. If necessary, special notes on re-assembling or adjusting a component are given at the end of each procedure.
  • Page 64: Housing, Upper Removal

    Chapter 3 Disassembly and Assembly 3.2.1 HOUSING, UPPER Removal 1. Remove the platen knob from the printer. 2. Remove two screws (CBB/M4x14) fixing [COVER, WIRE] and remove it. 3. Disconnect the cable of the control panel from a connector CN15 on C214 MAIN board. 4.
  • Page 65: Printer Mechanism Removal

    LQ-670 Service Manual 3.2.2 Printer Mechanism Removal 1. Remove [HOUSING, UPPER] (See Section 3.2.1) 2. Disconnect all cables of the Printer Mechanism from the C214 MAIN board: CN5 ( PW Detector (Top)) CN6 ( Printhead (Front)) CN7 ( Printhead (Rear))
  • Page 66: C214 Main Board Removal

    Chapter 3 Disassembly and Assembly 3.2.3 C214 MAIN Board Removal 1. Remove [HOUSING, UPPER] (See Section 3.2.1) 2. Remove Printer Mechanism (See Section 3.2.2) 3. Remove seven screws (5: CBB/M3x12, 2: CBS/M3x4) fixing the shield plate, and remove the shield plate. 4.
  • Page 67: C214 Psb/Pse Board Removal

    LQ-670 Service Manual 3.2.4 C214 PSB/PSE Board Removal 1. Remove [HOUSING, UPPER] (See Section 3.2.1) 2. Remove the Printer Mechanism (See Section 3.2.2) 3. Remove the shield plate (See Section 3.2.3 at step 3) 4. Disconnect the cable of C214 PSB/PSE board from a connector CN3 on C214 MAIN board.
  • Page 68: Ep-Rom Replacement

    Chapter 3 Disassembly and Assembly 3.2.5 EP-ROM Replacement When the program ROM (EP-ROM) on C214 MAIN board need to be replaced (for program version-up), follow the instruction below. 1. Remove two screws (CBB/M4x14) fixing [COVER, WIRE] and remove it. 2. Remove the EP-ROM from the IC socket IC8 on C214 MAIN board. CHECK POINT When you remove or re-install the EP-ROM, be careful not to damage the lead terminals of the IC.
  • Page 69: Printhead Removal

    LQ-670 Service Manual 3.2.6 Printhead Removal 1. Open the printer cover. 2. Remove two screws (CBS/M3x10) fixing the printhead to the carriage assembly, and remove the printhead. 3. Disconnect the cables connected to the printhead. CAUTION Make sure that C214 MAIN board operates correctly, before replacing the printhead to new one.
  • Page 70: Ribbon Mask Removal

    Chapter 3 Disassembly and Assembly 3.2.7 Ribbon Mask Removal 1. Remove the printhead (See Section 3.2.6) 2. Remove the ribbon mask from the ribbon mask holder, by unhooking the tabs that hold the ribbon mask in place. CHECK POINT Be careful not to damage or deform the ribbon mask when you handle it. Figure 3-8.
  • Page 71: Paper Exit Assy. Removal

    LQ-670 Service Manual 3.2.8 PAPER EXIT ASSY. Removal 1. Remove [HOUSING, UPPER] (See Section 3.2.1) 2. Remove two screws (CBS/M3x6) fixing the Paper Exit Assy. to the Printer Mechanism. 3. First, slightly pulling the Paper Exit Assy. toward you, then lifting it upward to remove it.
  • Page 72: Ribbon Mask Holder Removal

    Chapter 3 Disassembly and Assembly 3.2.9 Ribbon Mask Holder Removal 1. Remove [HOUSING, UPPER] (See Section 3.2.1) 2. Remove the Printhead (See Section 3.2.6) 3. Remove the Paper Exit Assy.(See Section 3.2.8) 4. Unhook the cables (to Printhead / PW Detector) from a cable hook on the Carriage Assy. 5.
  • Page 73: Pw Detector (Top) Removal

    LQ-670 Service Manual Figure 3-11. Cable Rooting 3.2.10 PW Detector (Top) Removal 1. Remove [HOUSING, UPPER] (See Section 3.2.1) 2. Remove the Printhead (See Section 3.2.6) 3. Remove the Paper Exit Assy. (See Section 3.2.8) 4. Remove the Ribbon Mask Holder (See Section 3.2.9) 5.
  • Page 74: Motor, Cr Removal

    Chapter 3 Disassembly and Assembly 3.2.11 MOTOR, CR Removal 1. Remove the Printer Mechanism (See Section 3.2.2) 2. Unhook the cable of [MOTOR, CR] from a cable hook at the bottom of the Printer Mechanism. 3. Remove [TENSION SPRING, 14.5] attached at the top right of the Printer Mechanism, to loosen the timing belt.
  • Page 75: Carriage Assy. Removal

    LQ-670 Service Manual 3.2.12 Carriage Assy. Removal 1. Remove the Printer Mechanism (See Section 3.2.2) 2. Remove [TENSION SPRING, 14.5] attached at the top right of the Printer Mechanism, to loosen the timing belt. 3. Remove [CAP, LEVER] and [HOLDER, ADJUST, LEVER].
  • Page 76 Chapter 3 Disassembly and Assembly Figure 3-14. CARRIAGE ASSY. Removal (1) Figure 3-15. CARRIAGE ASSY. Removal (2) 3-17 Rev. A...
  • Page 77: Ratchet, Rd Removal

    LQ-670 Service Manual 3.2.12.1 RATCHET, RD Removal 1. Remove the Carriage ASSY. (See Section 3.2.12) 2. Remove the Ribbon Cartridge Holder from the Carriage ASSY., by unhooking three tabs. 3. Take out [RATCHET, RD] from the Ribbon Cartridge Holder. CHECK POINT When re-installing the Ribbon Cartridge Holder to the Carriage ASSY., first, hook the...
  • Page 78: Paper Guide Removal

    Chapter 3 Disassembly and Assembly 3.2.13 PAPER GUIDE Removal 1. Remove the Printer Mechanism. (See Section 3.2.2) 2. Remove the paper exit ASSY. (See Section 3.2.8) 3. Remove the carriage ASSY. (See Section 3.2.12) 4. Remove the CR motor cover from [FRAME, CR] and [MOTOR, CR]. 5.
  • Page 79 LQ-670 Service Manual Figure 3-18. PAPER GUIDE ASSY. Removal (2) Figure 3-19. PAPER GUIDE ASSY. Removal (3) 3-20 Rev. A...
  • Page 80 Chapter 3 Disassembly and Assembly Figure 3-20. PAPER GUIDE ASSY. Removal (4) Figure 3-21. PAPER GUIDE ASSY. Removal (5) 3-21 Rev. A...
  • Page 81: Platen Removal

    LQ-670 Service Manual 3.2.14 Platen Removal 1. Remove the Printer Mechanism (See Section 3.2.2) 2. Remove the Paper Exit ASSY. (See Section 3.2.8) 3. Remove the Carriage ASSY. (See Section 3.2.12) 4. Remove the Paper Guide (See Section 3.2.13) 5. Rotate the platen shaft holder at the both ends of the platen, to match a tab to a cutout of the frame assembly.
  • Page 82: Motor, Pf Removal

    Chapter 3 Disassembly and Assembly 3.2.15 MOTOR, PF Removal 1. Remove the Printer Mechanism (See Section 3.2.2) 2. Take out the cable of [MOTOR, PF] from the cable holder at the bottom of Printer Mechanism. 3. Remove tow screws (CBS/M3x6) fixing [MOTOR, PF] to [FRAME ASSY., LEFT] and remove it.
  • Page 83: Detector, Hp Removal

    LQ-670 Service Manual 3.2.16 DETECTOR, HP Removal 1. Remove the Printer Mechanism (See Section 3.2.2) 2. Unhook [DETECTOR, HP] form [FRAME, CR] and remove it. 3. Disconnect the cable from [DETECTOR, HP]. 3.2.17 DETECTOR, PG Removal 1. Remove the Printer Mechanism (See Section 3.2.2) 2.
  • Page 84: Detector, Pe, Front Removal

    Chapter 3 Disassembly and Assembly 3.2.19 DETECTOR, PE, FRONT Removal 1. Remove the Printer Mechanism (See Section 3.2.2) 2. Remove the Paper Exit ASSY. (See Section 3.2.8) 3. Unhook the detector holder from both the Paper Guide Frame and a shaft of [ROLLER, PF, DRIVE].
  • Page 85: Detector, Pe, Rear Removal

    LQ-670 Service Manual 3.2.20 DETECTOR, PE, REAR Removal 1. Remove the Printer Mechanism (See Section 3.2.2) 2. Unhook three tabs of [HOLDER, CABLE, LOWER] at the bottom of the Printer Mechanism, and remove it from the Printer Mechanism. 3. Remove a screw (CBS/M3x6) fixing [DETECTOR, PE. REAR].
  • Page 86: Lever, Release Removal

    Chapter 3 Disassembly and Assembly 3.2.21 LEVER, RELEASE Removal 1. Remove the Printer Mechanism (See Section 3.2.2) 2. Remove two E-shaped retaining rings (#4) that fixing [LEVER, RELEASE] to [FRAME ASSY., RIGHT]. 3. Remove [LEVER, RELEASE] from [FRAME ASSY., RIGHT], together with [COMBINATION GEAR, 16, 16].
  • Page 87: Tractor Assy. Removal

    LQ-670 Service Manual 3.2.22 Tractor ASSY. Removal 1. Remove the Printer Mechanism (See Section 3.2.2) 2. Remove two hexagonal nuts fixing [SHAFT, TR, GUIDE] at the both side of the mechanism. 3. Rotate the shaft holder attached to the right end of [SHAFT, TR, DRIVE] to match the tabs to a cutout of [FRAME ASSY., RIGHT], and remove it.
  • Page 88 Chapter 4 Adjustments 4.1 Adjustment Overview ...................4-1 4.1.1 Required Adjustments ......................4-1 4.1.2 Required Adjustment Tools ....................4-1 4.2 Adjusting and Resetting the Printer..............4-2 4.2.1 Platen Gap Adjustment ......................4-2 4.2.2 Factory Settings........................4-3 4.2.3 Bi-d Adjustment ........................4-5...
  • Page 89: Adjustment

    Chapter 4 Adjustments 4.1 Adjustment Overview 4.1.1 Required Adjustments This section describes what adjustments are required after any part is removed or replaced. The following table shows the relationship between the repaired item and the adjustment. Table 4-1. Required Adjustments Required / Adjustment Platen Gap Bi-d Print...
  • Page 90: Adjusting And Resetting The Printer

    LQ-670 Service Manual 4.2 Adjusting and Resetting the Printer 4.2.1 Platen Gap Adjustment This adjustment consists of platen parallelism adjustment and platen gap adjustment. Parallelism adjustment is to adjust parallelism of track(CR guide shaft) that platen roller and print head moved.
  • Page 91: Factory Setting

    Chapter 4 Adjustments 4.2.2 Factory Setting 1. Unplug the cable of the printer from the AC socket. 2. Connect the printer and the PC by the parallel interface cable. 3. Plug in the cable of the printer and turn on the printer. 4.
  • Page 92 LQ-670 Service Manual 9. In this menu, Select 106 column by moving the cursor with the or and press ENTER key. After the selection is made, the following menu is displayed. 10. In this menu, select FF paper by moving the cursor with the or and press ENTER key.
  • Page 93: Bi-D Adjustment

    Chapter 4 Adjustments 4.2.3 Bi-d Adjustment Bi-d adjustment can be done either by the panel operation or adjustment program. This section describes Bi-d adjustment by the program. 1. Plug off the cable of the printer from the AC socket. 2. Connect the printer and the PC by the parallel interface. 3.
  • Page 94 LQ-670 Service Manual 8. If 4 lines are not straight vertically, you can adjust by changing setting values with key. „If the second and fourth lines are printed right side, compared with the first and third lines, change the setting value by pressing key.
  • Page 95: Troubleshooting

    Chapter 5 Troubleshooting 5.1 Overview........................5-1 5.2 Unit Level Troubleshooting .................5-2 5.3 Repairing the Power Supply Circuit Board ............5-11 5.4 Repairing the Main Board ..................5-14 5.5 Repairing the Printer Mechanism..............5-17...
  • Page 96: Overview

    LQ-670 Service Manual 5.1 Overview This chapter contains flowcharts and checkpoint tables to help you troubleshoot the printer. Flowcharts let you isolate a faulty unit based on abnormal symptoms. The checkpoint tables let you identify the faulty part or unit by checking the values or ranges listed for each component.
  • Page 97: Unit Level Troubleshooting

    LQ-670 Service Manual 5.2 Unit Level Troubleshooting You may be able to identify the defective unit just from the symptom displayed. The table below provides the symptoms for a number of failures. Once you identify the problem, refer to the flowchart listed in the right-hand column of the table below to determine the cause of the problem.
  • Page 98 LQ-670 Service Manual [Printer does not work when the power is turned on ] Figure 5-2. Flowchart 1 Rev. A...
  • Page 99 LQ-670 Service Manual [Printer goes error conditions when the power is turned on] Figure 5-3. Flowchart 2 Rev. A...
  • Page 100 LQ-670 Service Manual [Abnormal printing during the self-test] Figure 5-4. Flowchart 3 Rev. A...
  • Page 101 LQ-670 Service Manual [Abnormal paper feed] Figure 5-5. Flowchart 4 Rev. A...
  • Page 102 LQ-670 Service Manual [Abnormal control panel operation] Figure 5-6. Flowchart 5 Rev. A...
  • Page 103 LQ-670 Service Manual [Abnormal operation at power on] Figure 5-7. Flowchart 6 Rev. A...
  • Page 104 LQ-670 Service Manual Table 5-4. Output Voltage of the Power Supply Board Connector No. Pin No. Output voltage +42V Note) Each head coil resistance can be measured between the number of each common terminal and the same wire number. Direct current resistance: 39.3 2.7 (at 25 C) Figure 5-8.
  • Page 105 LQ-670 Service Manual Refer to the tables below and it can be easily determined if a particular part is defective or not by checking the coil resistance of the motor or continuity of the transistor using multimeter. Table 5-5. Coil Resistance of the Motor Connector No.
  • Page 106: Repairing The Power Supply Circuit Board

    LQ-670 Service Manual 5.3 Repairing the Power Supply Circuit Board This section explains problems related to the power supply circuit board(C214PSB). Since the table below lists likely causes according to the order of frequently seen symptoms, find an appropriate symptom and check the checkpoint.
  • Page 107 LQ-670 Service Manual Table 5-9. Repairing C214PSB Board (Con.) Symptom Condition Cause Checkpoint Solution Normal voltage All output voltage T1 is Check the voltage (pin 6, Replace the power is not output. is defective. defective. 7)which is charged to the supply board, T1 or coil of the primary side.
  • Page 108 LQ-670 Service Manual Table 5-10. Repairing the C214PSB Board (Con.) Symptom Condition Cause Checkpoint Solution Normal voltage is All the output +42V Check the waveform of 1pin in the Replace the not output. voltage is stabilization Photo coupler PC1. If it is unloaded,...
  • Page 109: Repairing The Main Board

    LQ-670 Service Manual 5.4 Repairing the Main Board Refer to the following table for repairing the main board. Table 5-11. Repairing the C214 Main Board Symptom Condition Cause Checkpoint Solution The printer does Reset signal is Defective After the power is turned on, Replace the main not work at all.
  • Page 110 LQ-670 Service Manual Table 5-12. Repairing C214 Main Board (Con.) Symptom Condition Cause Checkpoint Solution Printer goes to Fatal error. +42V monitor Check the voltage of 3 or 4 Replace the main error state. circuit is defective. pin in CN3.
  • Page 111 LQ-670 Service Manual Table 5-13. Repairing the C214 Main Board (Con.) Symptom Condition Cause Checkpoint Solution Paper feed PF motor control PF motor control Check the phase signal of Replace the main operation is is abnormal. circuit is defective. pin 8 and output signal of board, IC1 or IC2.
  • Page 112: Repairing The Printer Mechanism

    LQ-670 Service Manual 5.5 Repairing the Printer Mechanism This section provides instruction for repairing the printer mechanism. It describes various problems, symptom, likely causes, checkpoints, and solutions. Table 5-14. Repairing the Printer Mechanism Symptom Condition Cause Checkpoint Solution CR motor is...
  • Page 113 LQ-670 Service Manual Table 5-15. Repairing the Printer Mechanism (Con.) Symptom Condition Cause Checkpoint Solution Paper feed is Printing is PF motor is Measures coil resistance Replace the PF motor abnormal. performed, but no defective. (If necessary, replace of PF motor. 16...
  • Page 114: Maintenance

    Chapter 6 Maintenance 6.1 Preventive Maintenance..................6-1...
  • Page 115: Preventive Maintenance

    ; Disconnect the printer from the AC socket before performing maintenance. The influence that grease and oil give is great and especially in low temperature. Therefore, EPSON has been tested and analyzed various grease and oil extensively and chooses the best one for that printer.
  • Page 116 LQ-670 Service Manual Figure 6-1. Lubrication Points Rev. A...
  • Page 117 Appendix A.1 Connector Summary................... A-1 A.2 Circuit Diagram ....................A-5 A.3 Component Layout....................A-8 A.4 Exploded Diagram..................... A-10 A.5 Dimension and Weight..................A-16...
  • Page 118: Connector Summary

    LQ-670 Service Manual A.1 Connector Summary Figure A-1 illustrates how primary components are connected. Table A-1 summarizes functions and sizes of the connectors. Figure A-1. Cable Connections Table A-1. Connector Summary Board Connector No. Description Main Board Parallel I/F (Refer to Chapter 1 for pin...
  • Page 119 Appendix Table A-2. Connector Pin Assignment-CN3 Signal Function Ground Ground +42V +42VDC +42V +42VDC Ground Ground +5VDC +5VDC PWDN Power-down signal Power switch Table A-3. Connector Pin Assignment-CN5 Signal Function +5VDC +5VDC Ground PW(TOP) Detector Table A-4. Connector Pin Assignament-CN6 Signal Function Pin 5 drive signal...
  • Page 120 LQ-670 Service Manual Table A-5. Connector Pin Assignmen-CN7 Signal Name Function Pin 3 drive signal HD11 Pin 11 drive signal Pin 2 drive signal HD19 Pin 19 drive signal Pin 7 drive signal +42V +42VDC +42V +42VDC +42V +42VDC HD22...
  • Page 121 Appendix Table A-11. Connector Pin Assignment-CN13 Signal Name Function PE[REAR] (Rear) PE detector signal Table A-12. Connector Pin Assignment-CN14 Signal Name Function PE[FRONT] (Front) PE detector signal Table A-13. Connector Pin Assignment-CN15 Signal Name Function LED9 LED 9 drive signal LED2 LED 2 drive signal LED3...
  • Page 122: Circuit Diagram

    LQ-670 Service Manual A.2 Circuit Diagram Figure A-2. C214Main Board Circuit Diagram Rev. A...
  • Page 123 Appendix Figure A-3. C214PSB Board Circuit Diagram Rev. A...
  • Page 124 LQ-670 Service Manual Figure A-4. C214PSE Board Circuit Diagram Rev. A...
  • Page 125: Component Layout

    Appendix A.3 Component Layout Figure A-5. C214 Main Board Component Layout Rev. A...
  • Page 126 LQ-670 Service Manual Figure A-6. C214 PSB Board Component Layout Figure A-7. C214 PSE Board Component Layout Rev. A...
  • Page 127: Exploded Diagram

    Appendix A.4 Exploded Diagram Figure A-8. Exploded Diagram A-10 Rev. A...
  • Page 128 LQ-670 Service Manual Figure A-9. Exploded Diagram A-11 Rev. A...
  • Page 129 Appendix Figure A-10. Exploded Diagram A-12 Rev. A...
  • Page 130 LQ-670 Service Manual Table A-14. Parts Reference Table Ref. No. Description Parts Price List Name Upper Housing Housing, Upper Front Cover Cover, Printer Lower Housing Assembly Housing, Assembly, Lower Logo Plate Logo Plate Printer Cover Assembly Cover Assembly, Printer; B...
  • Page 131 Appendix Table A-15. Parts Reference Table (Con.) Ref. No. Description Parts Price List Name Combination Gear 9.17 Combination Gear, 9.17 Combination Gear 14,26 Combination Gear, 14,26 Ratchet, RD Ratchet, RD RD Platen Lever Lever, RD, Platen Driven Pulley Pulley, Driven CR Motor Cover Cover, Motor, CR Release Shaft...
  • Page 132 LQ-670 Service Manual Table A-16. Parts Reference Table (Con.) Ref. No Description Parts Price List Name Tension Spring 14.5 Extension Spring, 14.5 Compression Spring 1.47 Compression Spring, 1.47 Tension Spring 0.55 Extension Spring, 0.55 Compression Spring 1.96 Compression Spring, 1.96 Compression Spring 1.47...
  • Page 133: Dimension And Weight

    Appendix A.5 Dimension and Weight ‰Exterior Dimension „Body only : 469mm (W) X 390mm (D) X 256mm (H) „Body including CSF 1 bin : 469mm (W) X 620mm (D) X 446mm (H) „Body including CSF1 & 2 bins : 469mm (W) X 693mm.(D) X 446mm (H) ‰Weight „Body only : About 9.1Kg...
  • Page 134 EPSON OVERSEAS MARKETING LOCATIONS EPSON AMERICA, Inc. EPSON DEUTCHLAND GmBH 20770 Madrona Avenue, Zülpicher Straße 6, 4549 Düsseldorf P.O. Box 2842 Germany Torrance, CA 90509-2842 Phone: (800)922-8911 Phone: (0211)56030 Fax: (310)782-5220 Telex: 8584786 EPSON UK LTD. EPSON FRANCE S.A. Campus 100, Maylands Avenue,...
  • Page 135 EPSON SEIKO EPSON CORPORATION...

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