Instruction/ maintenance manual of the product 670 Epson
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EPSON IMPACT DOT MATRIX PRINTER EPSON LQ-670 SERVICE MANUAL SEIKO EPSON CORPORATION 4007875.
ii NOTICE All rights reser ved. Reproduction of any part of t his manual in any for m whatsoever without SEIKO EPSON’s express written permission is forbidden. The contents of this manual are subjects to change without notice. All eff ort s have been made to ensure the accuracy of the content s of t his manual.
iii PRECAUTIONS Precautionary notations throughout the text are categorized relative to 1) personal injur y and 2) damage to equipment. WARNING Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing procedures preceded by WARNING Headings.
iv PREFACE This m anual desc ribes func tions, theory of electrical and m echanical oper ations, maintenanc e, and repair of EPSON LQ-670. The inst ructions and pr ocedures inc luded herein are intended for the exper ience r epair tec hnician, and attention should be given to die precautions on the preceding page.
v REVISION SHEET Revision Issued Data Contents Rev. A May 28, 1997 First issue.
vi TABLE OF CONTENTS CHAPTER 1. GENERAL DESCRIPTION CHAPTER 2. OPERATING PRINCIPLES CHAPTER 3. DISASSEMBLY AND ASSEMBLY CHAPTER 4. ADJUSTMENT CHAPTER 5.
Chapter 1 Product Descriptions 1.1 Specifications .......................................................................................................1-1 1.1.1 Features ...............................................................................
Chapter 1 Product Description Rev . A 1-1 1.1 Specifications This s pecif ications provide c haracteris tics of the serial im pact dot m atr ix printer LQ -670. 1.1.1 Features LQ-670 is a 24pin s erial im pact dot m atrix pr inter for the V AR(value added reseller) m ark et.
LQ-670 Service Manual Rev . A 1- 2 Consum ables and optional units Name Part Number Ribbon cartridge S015016 High capacity cut sheet feeder (Bin1) C806781 (EAI version) High capacity cut sheet .
Chapter 1 Product Description Rev . A 1- 3 1.2 Hardw are Specifications This section des cribes hardware spec ification f or the LQ -670. 1.2.1 Printing Method Printing Method : Impac t dot m atrix Num ber of pins : 24 pins Print pin arrangem ent : 12x2 stagger ed Print pin diam eter : 0.
LQ-670 Service Manual Rev . A 1- 4 1.2.2 Printing Specifications Copy capability :1 original + 4 copies Print speed and printable c olum ns Printing Mode Character Pitc h Printable Colum.
Chapter 1 Product Description Rev . A 1- 5 1.2.3 Paper Handling Specifications Feeding m ethod :Friction feed (front m anual, r ear CSF) Push tractor feed (rear) Feeder :Rear push tracto.
LQ-670 Service Manual Rev . A 1- 6 1.2.4 Paper Specification This s ection desc ribes printable ar ea and types of paper that can be used in this printer .
Chapter 1 Product Description Rev . A 1- 7 Envelope Front Entry (Manual Insertion) Rear Entry (CSF) Minimu m Max im um Minimu m Maxim um Envelope W idth (inc h) 6.5 6.5 (No.6) (m m ) 165 165 Length (inch) 3.6 3.6 (m m ) 92 92 Envelope W idth (inc h) 9.
LQ-670 Service Manual Rev . A 1- 8 Continuous paper (Single s heet and Multi part) Rear Entry (T ractor) Minimu m Maxim um W idth (inch) 4 12 (m m ) 101.6 304.8 Length(one page) (inch) 4 22 (m m ) 101.6 558.8 Copies 1 original + 4 copies T otal thicknes s (inch) 0.
Chapter 1 Product Description Rev . A 1- 9 Roll paper Rear Entry (Roll paper holder) Minimu m Maxim um Wi d t h ( i n c h ) 8 . 5 (mm) 2 16 Length (inch) ----- (mm) Thick nes s ( inch) 0.0028 0.0035 (m m ) 0.07 0.09 W eight (g/m 2 )5 2 8 2 (lb) 14 22 Quality Plain paper , Reclaimed paper .
LQ-670 Service Manual Rev . A 1-1 0 1.2.5 Printable A rea Cut sheets Single sheet Multi part PW (W idth) (Refer to s ection 1.2.4) (Ref er to sec tion 1.
Chapter 1 Product Description Rev . A 1-1 1 Envelope and card Envelope Card PW (W idth) (Refer to s ection 1.2.4) (Refer to section 1.2.4) PL (Length) (Refer to section 1.2.4) (Refer to section 1.2.4) LM ( Lef t ma rg in ) 3 mm o r mo re 3 mm o r mo re RM (R i g h t ma rg i n ) 3 mm o r mor e 3 mm o r mo re TM (T o p mar gi n ) 0 .
LQ-670 Service Manual Rev . A 1-1 2 Continuous paper Continuous paper PW (W idth) (Refer to s ection 1.2.4) PL (Length) (Refer to section 1.2.4) LM (Left m argin) 13mm or mor e RM (Right m argin) 13mm or mor e TM (T o p mar gi n ) 4. 2mm o r mo re B M (B o tt om ma rg in ) 4.
Chapter 1 Product Description Rev . A 1-1 3 Roll paper Continuous paper PW (W idth) (Refer to s ection 1.2.4) PL (Length) (Refer to section1.2.4) LM (Left m argin) 3mm or m ore RM (R i g h t ma rg i n ) 3 mm or mo re TM (T o p mar gi n ) 0. 0mm o r mo re B M (B o tt om ma rg in ) 0.
LQ-670 Service Manual Rev . A 1-1 4 1.2.6 Ri bbon Cartri dge T ype : Fabr ic Color : Black Ribbon life : 2 million c haracter s (LQ 10c pi, 48 dots/char acter) Dim ensions :120.5mm ( W ) x 101.5m m (D) x 23.5m m (H) 1.2.7 Input data buffer 0 Kby te or 64 Kby te* Note*) : Depends on default s ettings.
Chapter 1 Product Description Rev . A 1-1 5 1.2.10 Envi ronmental Conditi on T emper ature O perating : 5 to 35 ° C( without condensation) : 15 to 25 ° C (without condensation and duri.
LQ-670 Service Manual Rev . A 1-1 6 1.3 Firmw are Specification This s ection provides detailed inform ation about LQ -670 firm ware. 1.3.1 Control Codes and Fonts Control codes: :ESC/P 2 and I.
Chapter 1 Product Description Rev . A 1-1 7 Character tables :T he standar d version has 1 1 char acter tables and the NLSP ver sion has 20 charater tables , as shown in the following table.
LQ-670 Service Manual Rev . A 1-1 8 1.3.2 Interface Specification This printer provides bi-direc tional 8-bit parallel interf ace and Ty pe-B optional inter face s lot as standar d.
Chapter 1 Product Description Rev . A 1-1 9 BUSY signal is active (high level) under the following conditions . In the process of rec eiving data .
LQ-670 Service Manual Rev . A 1-2 0 1.3.2.2 Parallel Interface (Reverse channel) [T ransmission mode] : IEEE 1284 nibble m ode [A daptable connector] : 57-30360(Amphenol) or equivalent [Synchr onizati.
Chapter 1 Product Description Rev . A 1-21 1.3.2.3 Optional Interface T ype-B optional interfac e cards are available. Reply mes sage ESC/P2 IBM 2390 Plus Main-T ype MT24p,PW 106cl10cpi,PRG(W 0xxxx)rev MT 24p,PW 106c1 10cpi,PRG(W 0xxxx)rev Product-Nam e LQ- 670 LQ-670 Emulation- T ype ESCPL2-00 PRPXL24-01 Entity -T y pe EPSONLQ2 EPSONPRPXL24 1.
LQ-670 Service Manual Rev . A 1-2 2 1.4 Operation 1.4.1 Control Panel There ar e 7 switches and 8 LEDs on the panel as shown below . 1.4.1.1 Usual Operation Operate This s witch turns the pr inter on and off. It is the secondary switch. Pause This s witch alternates pr inter activity between printing and non-printing.
Chapter 1 Product Description Rev . A 1-2 3 Bin Pressing it s elects CSF bin num ber or the Card m ode* when cut sheet is us ed. Note*) Card m ode is for using post c ard or envelope. Font Pressing it s elects one of following fonts . Draft, Rom an, Sans s erif, Cour ier , Prestige, Sc ript and Others *.
LQ-670 Service Manual Rev . A 1-2 4 1.4.1.2 Switches Operation in norm al m ode In norm al m ode, pressing panel s witches executes following func tion. Switch Function Operate Turn the printer on and off. Pause Alternates printing and no-pr inting status.
Chapter 1 Product Description Rev . A 1- 2 5 1.4.1.3 Indicators(LED) This pr inter displays present conditions and errors on the indicators. Indication in norm al m ode LED Printer Status Paus .
LQ-670 Service Manual Rev . A 1-2 6 1.4.1.4 Buzzer W hen the printer detects errors , it displays errors on the LEDs and als o the buzz er beeps as warning sign.
Chapter 1 Product Description Rev . A 1-2 7 1.4.2 Default Setting Setting Method Several printer s ettings loaded at each power-on c an be changed in this operation. T he m ethod is described in the guidanc e sheets ( language selection sheet and pr inter setting sheet) which are printed out at firs t in the setting m ode if des ired.
LQ-670 Service Manual Rev . A 1-2 8 Note*1): One of thes e fonts s elected in the def ault setting is cor responding to others (=other f onts) on the control panel.
Chapter 1 Product Description Rev . A 1-2 9 1.4.4 Initialization Power-On initialization The initialization of this level is activated by power-on or cold res et com m and(r emo te RS com m and). This initialization is; to initialize the printer m ec hanism .
LQ-670 Service Manual Rev . A 1-3 0 1.5 Main Components This pr inter cons ists of the following com ponents. C214MAIN Board C214 PSB/PSE Board C214 PNL Board Printer Mechanis m (M-5060) Housing 1.5.1 C214 Main Board This m ain boar d consis ts of 16bitCPU T MP96C041AF (IC1 1) which is dr iven by 17.
Chapter 1 Product Description Rev . A 1-31 1.5.3 C214 PNL Board This panel boar d consis ts of one s witch as power switch, 6 non lock type switches and 8 LEDs.
Chapter 2 Operating Principles 2.1 Printer Mechanism Operation.............................................................................. 2-1 2.1.1 Printing Mechanism .................................................................................
LQ-670 Service Manual Rev . A 2-1 2.1 Printer Mechanism Operation This s ection desc ribes the printer m echanism (M- 5060) and explains how it work s. 2.1.1 Printing Mechanism The printing m ec hanism of this printer is c om posed of head, ink ribbon and ribbon m as k.
Chapter 2 Operating Principles Rev . A 2- 2 Category Specif ication Print Method Impac t dot m atrix Number of pin wires 24-pin (12X2) W ire diam eter 0.20mm Print head life 200 million s trok es/wire W eight 1 15 ± 12g Coil direct current resist ance 39.
LQ-670 Service Manual Rev . A 2- 3 2.1.2 Carriage Mechanism Carriage Mechanism c onsists of the car riage m ovem ent mec hanism and platen gap adjus tment me chanism . Carriage Movem ent Mechanism The f igure below shows carriage m ec hanism .
Chapter 2 Operating Principles Rev . A 2- 4 Category Specif ication T ype 200-pole, HB-type Stepping motor Coil Resistance 3.5 Ω ± 10% Drive V oltage 42V ± 5% Drive Resolution 0.106mm /step ( 1-2 phase) Drive Method Constant c urrent drive 1-2 phase, W 1-2 phas e Current Consum ption Rated speed : 0.
LQ-670 Service Manual Rev . A 2- 5 2.1.3 Ribbon Advance Mechanism The ribbon advanc e m echanism cons ists of the rack m ounted on the carr iage guide fram e, the pinion mounted on the c arriage unit, planetary gear , com bination gear and ratchet RD.
Chapter 2 Operating Principles Rev . A 2- 6 2.1.4 Paper A dvance Mechanism The paper f eed m echanism of this printer consists of the platen roller , paper feed roller , paper eject r oller , PF motor , tractor unit, PW detec tor , PE (rear /front) detectors, r elease detector , and CSF mec hanism (option).
LQ-670 Service Manual Rev . A 2- 7 2.1.4.2 Paper Advance Detector Mechanism Paper advance detector m echanism cons ists of PW detector and PE ( rear/fr ont) detectors . The f unction of this m echanism is to f eedback inf orm ation about m onitoring paper edges, paper width and paper jam , and to contr ol paper advance.
Chapter 2 Operating Principles Rev . A 2- 8 Category Specif ication T ype Mechanism type Switch Rating 0.6 ∼ 1.0mA, 5VDC ± 5% Switch Mode Paper in : Open Paper out : Close Category Specif ication T ype Mechanism type Switch Rating 0.
LQ-670 Service Manual Rev . A 2- 9 2.1.4.3 Release Lever Mechanism Release lever m echanis m c onsists of the releas e lever , trac tor transm iss ion gear and the release detector .
Chapter 2 Operating Principles Rev . A 2-1 0 2.1.5 Platen Gap A djustment Platen gap (the gap between platen surfac e and print head) allows the printer to use differ ent thick ness of paper by setting appropriate gap so that the different thic k ness of paper can avoid getting printing dir t or pick ing the ribbon accidentally .
LQ-670 Service Manual Rev . A 2-1 1 2.2 Pow er Supply Operation 2.2.1 Pow e r Suppl y Ci r c ui t The power supply part of this pr inter consis ts of AC c able and power supply board. The power supply board provides CD c urrent, which is nec essary for the printer mec hanism and control c ircuit.
Chapter 2 Operating Principles Rev . A 2-1 2 2.2.1.2 Power Supply Circuit Operation In the power supply circuit, at first, the input AC power goes to the f ilter c ircuit, where rem oves the nois e, and goes to the diode bridge f or full- wave rectific ation and is sm oothed by the electroly tic capacitor .
LQ-670 Service Manual Rev . A 2-1 3 2.2.2 Contr ol Circui t This s ection desc ribes m ain f unction of the c ontrol circ uit. The m ain c ircuit is m ounted on the C214 m ain board. 2.2.2.1 Operating Principles of the Control Circuit This pr inter ’s contr ol circuit inc ludes a TM96C041AFCPU that r uns at 17.
Chapter 2 Operating Principles Rev . A 2-1 4 2.2.2.2 EEPROM Control Circuit EEPROM(IC9) us es three lines s erial in/output 1k bit EEPROM and recor ds default s etting values and destination param eter . Control s ignals of EEPRO M; CS,CK,DO, DI are attac hed in the CPU port P70 ∼ 73 and, are controlled.
LQ-670 Service Manual Rev . A 2- 1 5 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. T he CPU initializes the port P26 and sends a s ignal to the manual r eset port MRES in the Res et IC(IC12) in order to let IC12 to output the reset signal.
Chapter 2 Operating Principles Rev . A 2-1 6 2.2.2.6 CR Motor Driver Circuit The CR m otor dr iver circuit of this pr inter consis ts of CPU, gate ar ray , CR motor drive IC SLA7024M (IC3) and CR motor . The CPU sends phas e data; INA, /INA, INB and/INB from the port PG O0-3 to the CR motor IC.
LQ-670 Service Manual Rev . A 2-1 7 2.2.2.8 Operation Panel Control Circuit The panel contr ol circuit c onsists of panel switches and gate array . The gate ar ray detects the switch condition by the port SW 0-SW 5 and controls LED by LED0-9.
Chapter 2 Operating Principles Rev . A 2-1 8 2.2.2.9 Interface(I/F) Circuit The interf ace of this printer c onsists of gate arr ay , par allel I/F connector and optional type-B I/F connector .
Chapter 3 Disassembl y and Assembly 3.1 Overvie w ............................................................................................. . 3-1 3.1.1 Precautions for Disassembling the Printe r ............................. . 3-1 3.1.2 Tool s ...
3.2.16 DETECTOR, HP Removal ....................................................... 3-24 3.2.17 DETECTOR, PG Removal....................................................... 3-24 3.2.18 DETECTOR, REL Removal .............................................
Chapter 3 Disassembly and Assembly Rev. A 3-1 3.1 Ov erv iew 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.
LQ-670 Service Manual Rev. A 3-2 3.1.3 Service Check A fter 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.
Chapter 3 Disassembly and Assembly Rev. A 3- 3 3.1.4 Specifications for Screw s The table below lists the abbreviations used in this manual for small parts, such as screws and washers.
LQ-670 Service Manual Rev. A 3-4 3.2 Printer Disassembly and A ssembly 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.
Chapter 3 Disassembly and Assembly Rev. A 3- 5 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.
LQ-670 Service Manual Rev. A 3-6 3.2.2 Printer M echanism Removal 1. Remove [HOUSING, UPPER] (See Section 3.2.1) 2. Disconnect all cables of the Printer Mechanism from the C214 MAIN board: z CN5 ( Õ .
Chapter 3 Disassembly and Assembly Rev. A 3- 7 3.2.3 C214 M A IN 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.
LQ-670 Service Manual Rev. A 3-8 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.
Chapter 3 Disassembly and Assembly Rev. A 3- 9 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.
LQ-670 Service Manual Rev. A 3-10 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. Make sure that C214 MAIN board operates correctly, before replacing the printhead to new one.
Chapter 3 Disassembly and Assembly Rev. A 3-11 3.2.7 Ribbon M ask 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. Be careful not to damage or deform the ribbon mask when you handle it.
LQ-670 Service Manual Rev. A 3-12 3.2.8 P A PER 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.
Chapter 3 Disassembly and Assembly Rev. A 3-1 3 3.2.9 Ribbon M ask 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.
LQ-670 Service Manual Rev. A 3-14 3.2.10 PW Detector (T op) 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.
Chapter 3 Disassembly and Assembly Rev. A 3-1 5 3.2.11 M OTOR, CR Remov al 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.
LQ-670 Service Manual Rev. A 3-16 3.2.12 Carriage A ssy . Remov al 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].
Chapter 3 Disassembly and Assembly Rev. A 3-1 7 SHAFT, LEVER, PULLEY, DRIVEN LEVER, PULLEY, DRIVEN CAP, LEVER HOLDER, ADJUST, LEVER TENSION SPRING, 14.5 Hexagonal Nut Adjust Lever Figure 3-14. CARRIAGE ASSY. Removal (1) GUIDE, CR CR GUIDE SHAFT CARRIAGE ASSY.
LQ-670 Service Manual Rev. A 3-18 3.2.1 2.1 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.
Chapter 3 Disassembly and Assembly Rev. A 3-1 9 3.2.13 P A PER 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].
LQ-670 Service Manual Rev. A 3-20 GEAR, 16 ROLLER, PF, DRIVE COMBINATION GEAR, 8, 30 GEAR, 36 Hook Hook Figure 3-18. PAPER GUIDE ASSY. Removal (2) FRAME, CR CBS (M3x6) CBS (M3x6) Figure 3-19.
Chapter 3 Disassembly and Assembly Rev. A 3-21 ROLLER, PF, DRIVE Shaft Holder Shaft Holder Retaining Ring (#2) (E-shaped) Figure 3 - 20 . PAPER GUIDE ASSY. Removal (4) PAPER GUIDE CBS (M3x6) CBS (M3x6) Actuator (DETECTOR, PE, REAR) Slit of PAPER GUIDE Figure 3-21.
LQ-670 Service Manual Rev. A 3-22 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.
Chapter 3 Disassembly and Assembly Rev. A 3-2 3 3.2.15 M OTOR, PF Remov al 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.
LQ-670 Service Manual Rev. A 3-24 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.
Chapter 3 Disassembly and Assembly Rev. A 3-2 5 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].
LQ-670 Service Manual Rev. A 3-26 3.2.20 DETECTOR, PE, REA R 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.
Chapter 3 Disassembly and Assembly Rev. A 3-2 7 3.2.21 LEVER, RELEASE Remov al 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.
LQ-670 Service Manual Rev. A 3-28 3.2.22 T ractor A SSY . 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.
Chapter 4 A djustments 4.1 A djustment O v er v ie w .......................................................................................... . 4-1 4.1.1 Required A djustment s ........................................................................
Chapter 4 Adjustments Rev . A 4-1 4.1 A djustment Ov erv iew 4.1.1 Required A djustments This s ection desc ribes what adjus tments are required af ter any part is rem oved or replac ed. The f ollowing table shows the relationship between the repaired item and the adj ustm ent.
LQ-670 Service Manual Rev . A 4- 2 4.2 A djusting and Resetting the Printer 4.2.1 Platen Gap Adjustment This adj ustm ent cons ists of platen parallelism adjus tm ent and platen gap adjustm ent. Parallelis m adjustm ent is to adj ust parallelis m of track (CR guide s haft) that platen r oller and print head m oved.
Chapter 4 Adjustments Rev . A 4- 3 4.2.2 Factory Setting 1. Unplug the cable of the printer f rom the AC sock et. 2. Connect the printer and the PC by the parallel interface cable. 3. Plug in the cable of the printer and turn on the pr inter . 4. Set the release lever at the tractor s ide and also set the 12-inc h continuous paper (1p).
LQ-670 Service Manual Rev . A 4- 4 9. In this m enu, Select 106 column by moving the c ursor with the ↑ or ↓ and press ENT ER key . After the s election is m ade, the f ollowing m enu is displayed.
Chapter 4 Adjustments Rev . A 4- 5 4.2.3 Bi-d A djustment Bi-d adjustm ent c an be done either by the panel operation or adjustm ent program . This s ection desc ribes Bi-d adj ustm ent by the program. 1. Plug off the c able of the printer from the AC s ock et.
LQ-670 Service Manual Rev . A 4- 6 8. If 4 lines are not s traight vertically , you can adjust by changing setting values with ← or → ke y . If the sec ond and fourth lines are printed right side, c om pared with the first and third lines , change the setting value by pressing ← key .
Chapter 5 Troubleshooting 5.1 O v er v ie w ............................................................................................................... . 5-1 5.2 Unit Le v el T roubleshootin g ......................................................
LQ-670 Service Manual Rev . A 5-1 5.1 Ov erv iew This c hapter contains flowcharts and c heck point tables to help you troubleshoot the printer . Flowcharts let y ou isolate a faulty unit based on abnorm al symptom s. T he check point tables let you identify the faulty part or unit by checking the values or ranges lis ted for eac h com ponent.
LQ-670 Service Manual Rev . A 5- 2 5.2 Unit Lev el T roubleshooting Y ou may be able to identify the defective unit jus t from the sy mptom display ed.
LQ-670 Service Manual Rev . A 5- 3 [Printer does not wo rk when t he power is tu rned on ] A END YES NO NO YES NO YES NO YES NO YES NO YES NO YES YES NO Is the power supply voltage normal? Replace the fuse F1 and remove all out- put connectors. Normal? Replace the power supply board.
LQ-670 Service Manual Rev . A 5- 4 [Printer goes error conditions when the power is turned on] START YES NO YES NO YES NO NO YES YES NO YES YES NO NO YES YES NO YES YES NO YES NO NO NO YES Select an error type.
LQ-670 Service Manual Rev . A 5- 5 [A bnormal printing during the self-tes t] B NO NO YES NO YES YES YES NO NO YES YES NO YES NO NO YES YES NO Perform sel-test Measure the coil resistance of the print head. Does the printer print? Does the carriage move? Is coil resistance normal? Replace the print head.
LQ-670 Service Manual Rev . A 5- 6 [A bnormal paper feed] NO YES YES NO YES YES NO YES NO YES NO Normal? Normal? Replace the main board Replace the main board Replace the main board Replace the printer mechanism. Is the paper set correctly? Set the paper correctly.
LQ-670 Service Manual Rev . A 5- 7 [A bnormal control panel operation] NO YES NO YES YES NO NO YES YES NO Turn the power on without feeding paper Is voltage normal? Replace the control panel Replace the power supply board. Check output voltage of the power supply board.
LQ-670 Service Manual Rev . A 5- 8 [A bnormal operation at power on] NO END YES NO YES YES NO YES NO Perform the self-test. Is the self-test normal? Go to other trouble- shooting Exchange the interface cable. Normal? Replace the Main Board Normal? Replace the power- supply board.
LQ-670 Service Manual Rev . A 5- 9 Connector No. Pin No. O utput voltage 1.2 GP CN2 3,4 +42V 5.6 GL 7,8 +5V Note) Each head coil res istance c an be meas ured between the num ber of eac h com m on term inal and the sam e wire number . Direct cur rent resis tance: 39.
LQ-670 Service Manual Rev . A 5-1 0 Refer to the tables below and it can be easily determ ined if a partic ular par t is def ec tive or not by check ing the coil resis tance of the m otor or continuity of the transistor using m ultim eter . Connector No.
LQ-670 Service Manual Rev . A 5-1 1 5.3 Repairing the Pow er Supply Circuit Board This sec tion explains problem s related to the power supply c ircuit board( C214PSB). Since the table below lists lik ely causes accor ding to the order of frequently seen symptom s, find an appropr iate symptom and check the chec kpoint.
LQ-670 Service Manual Rev . A 5-1 2 Sy mptom C ondition Caus e Check point Solution Norm al voltage is not output. All output voltage is defec tive. • If +42V is not output norm ally , other voltages becom e abnorm al. T1 i s defective. Chec k the voltage ( pin 6, 7)which is char ged to the coil of the pr im ary side.
LQ-670 Service Manual Rev . A 5-1 3 Sy mptom Condition Cause C heck point Solution Norm al voltage is not output. All the output voltage is defective +42V stabilization circui t is defective. Check the waveform of 1pin in the Photo coupler PC1. If it is unloaded, the waveform with periodical pattern can be seen.
LQ-670 Service Manual Rev . A 5-1 4 5.4 Repairing the Main Board Refer to the f ollowing table for repairing the m ain board. Sy mptom C ondition Cause Check point Solution The printer does not work at all.
LQ-670 Service Manual Rev . A 5- 1 5 Sy mptom C ondition Cause Check point Solution Printer goes to error state . Fatal error . +42V m onitor circuit is defec tive. Check the voltage of 3 or 4 pin in CN3. • If the voltage is nor m al, CPU is defec tive.
LQ-670 Service Manual Rev . A 5-1 6 Sy mptom C ondition Cause Chec kpoint Solution Paper feed operation is abnorm al. PF motor control is abnorm al. PF motor control circuit is defec tive. Check the phase signal of pin 8 and output signal of pin 1 and pin 15 of IC1 or IC2.
LQ-670 Service Manual Rev . A 5-1 7 5.5 Repairing the Printer Mechanism This s ection provides instruc tion for r epairing the printer m echanis m. It des cribes various problem s, symptom , likely causes, c heck points, and solutions .
LQ-670 Service Manual Rev . A 5-1 8 Sy mptom C ondition Cause C heck point Solution Paper feed is abnorm al. Printing is perform ed, but no paper feed, or paper feed is not done sm oothly . PF motor is defective. Meas ures c oil resis tance of PF m otor .
Chapter 6 Maintenance 6.1 Preventiv e Maintenance .......................................................................................6-1.
Chapter 6 Ma intenance Rev . A 6-1 6.1 Prev entiv e Maintenance Preventive Maintenance is im por tant to keep the printer in the best condition and to pr event troubles in advance. Use the denatured alc ohol to clean the exterior case and use the vac uum cleaner if necessar y , to rem ove dust and paper debris in the printer inside.
LQ-670 Service Manual Rev . A 6- 2 Figure 6-1. Lubrication Points.
A ppendix A .1 Connector Summary ........................................................................................... A -1 A .2 Circuit Diagram ................................................................................................... A -5 A .
LQ-670 Service Manual Rev . A A-1 A .1 Connector Summary Figure A-1 illustr ates how primar y components are connected. T able A-1 s umm arizes functions and s izes of the connec tors.
Appendix Rev . A A- 2 Pin I/O Signal Function 1 --- GP Gr ound 2 --- GP Gr ound 3 --- +42V +42VDC 4 --- +42V +42VDC 5 --- GND G round 6 --- GND G round 7 --- +5 V +5VDC 8 --- +5 V +5VDC 9 O PW DN Powe.
LQ-670 Service Manual Rev . A A- 3 Pin I/O Signal Name Function 1 O HD3 Pin 3 drive signal 2 O HD1 1 Pin 1 1 drive s ignal 3 O HD2 Pin 2 drive signal 4 O HD19 Pin 19 drive s ignal 5 O HD7 Pin 7 drive .
Appendix Rev . A A- 4 Pin I/O Signal Nam e Function 1 I PE[REAR] (Rear) PE detec tor signal 2 --- GND GND Pin I/O Signal Nam e Function 1 I PE[FRONT ] (Front) PE detector signal 2 --- GND GND Pin I/O .
LQ-670 Service Manual Rev . A A- 5 A .2 Circuit Diagram Figure A -2. C214Main Board Circuit Diagram.
Appendix Rev . A A- 6 : Heat Sink (Q1, D51) Figure A -3. C214PSB Board Circuit Diagram.
LQ-670 Service Manual Rev . A A- 7 : Heat Sink (Q1, D51) Figure A-4. C214PSE Board Circuit Diagram.
Appendix Rev . A A- 8 A .3 Component Lay out Figure A - 5. C214 Main Board Component Layout.
LQ-670 Service Manual Rev . A A- 9 Figure A -6. C214 PSB Board Component Layout Figure A -7. C214 PSE Board Component Layout.
Appendix Rev . A A-1 0 A .4 Exploded Diagram Figure A -8. Exploded Diagram.
LQ-670 Service Manual Rev . A A-1 1 Figure A -9. Exploded Diagram.
Appendix Rev . A A-1 2 Figure A -10. Exploded Diagram.
LQ-670 Service Manual Rev . A A-1 3 Ref. No. Description Parts Pric e List Nam e 100 Upper Housing Housing, Upper 101 Fr ont Cover Cover , Printer 102 Lower Housing As sem bly Housing, Assem bly , Low.
Appendix Rev . A A-1 4 Ref. No. Description Parts Price Lis t Nam e 519 Com bination Gear 9.17 Com bination Gear , 9.17 520 Com bination Gear 14,26 Combination Gear , 14,26 521 Ratchet, RD Ratchet, RD.
LQ-670 Service Manual Rev . A A-1 5 Ref. No Description Parts Price List Nam e 568 T ens ion Spring 14.5 E xtension Spring, 14.5 569 Com pres sion Spring 1.47 Com press ion Spring, 1.47 570 T ens ion Spring 0.55 Extension Spring, 0.55 571 Com pres sion Spring 1.
Appendix Rev . A A-1 6 A .5 Dimension and Weight Exterior Dim ension Body only : 469m m (W ) X 390mm ( D) X 256m m (H) Body including CSF 1 bin : 469m m ( W ) X 620m m (D ) X 446m m (H) Body including CSF1 & 2 bins : 469mm ( W ) X 693m m .
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EPSON SEIKO EPSON CORPORATION.
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