Service manual

ManualsBrandsEpson ManualsComputer equipment2070 - LQ B/W Dot-matrix Printer

EPSON TERMINAL PRINTER

LQ-2070

SERVICE MANUAL

EPSON

4006244

Summary of content (165 pages)

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EPSON TERMINAL PRINTER LQ-2070 SERVICE MANUAL EPSON 4006244
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NOTICE • • • • All right reserved. Reproduction of any part of this manual in any form wharsoever without SEIKO EPSON’s express written permission is forbidden. 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.
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PRECAUTIONS Precautionary notations throughout the tect are categorized relative to 1) personal injury, and 2) damage to equipment: DANGER Singnals a precaution which, if ignored, could ressult in serious or fatal personal injury, Great caution should be exercised in performing procedures preceded by a DANGER headings. WARNING Singnals a precaution which, if ignored, could result in damage to equipment.
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PREFACE This manual describes functions, theory of electrical and mechanical operations, maintenance, and repair of the FX-2170. The instructions and procedures included herein are intended for the experienced repair technician, and attention should be given to the precautions on the preceding page. The chapters are organized as follows: Chapter 1 - Provides a general product overview, Lists specifications, and illustrates the main components of the printer.
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REVISION SHEET Revision Issued Date Revision Page Rev.
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TABLE OF CONTENTS CHAPTER 1. CHAPTER 2. CHAPTER 3. CHAPTER 4. CHAPTER 5. CHAPTER 6.
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CHAPTER 1 Product Description Table of Contents 1-1 1.1 Specifications 1.1.1 Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1.2 Accessories . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . 1-3 1-4 1.2 Hardware Specifications 1.2. I Printing Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 . . . . . . . . 1-5 1.2.2 Printing Specifications . . . . . . . . . . . . . . . . . . . . . .
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1-35 1.6 MAIN COMPONENTS 1.6.1 C186 MAIN Board Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36 1.6.2 C166 PSB/PSE Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36 1.6.3 C165 PNL Board Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37 1.6.4 Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37 1.6.5 Housing Assembly. . . . . . . . . . . . . . . . . . . . . . . .
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List of Tables Table 1-1. Items Included with the Printer . . . . . . . . . . . . . . . . . . . . . .........1-3 Table 1-2. Consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .1-3 Table 1-3. Optional Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . “ “ “ .1-3 Table l-4. PrintSpeed and Printable Columns . .........................1-5 Table l-5. Print Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .....
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Product Description LQ-2070 Sendce Manual 1.1 Specifications These specifications provide statistical information for the LQ-2070 serial impact dot matrix printer. 1.1.1. Features The LQ-2070 is a 24pin serial impact dot-matrix printer suitable for the VAR (value addedreseller) market. The major features of this printer are: .
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Product Description LQ-2070 Service Manual Figure 1-1 Exterior View of the LQ-2070 1-2 Rev.
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Product Description LCk2070 Service Manual 1.1.2. Accessories ● Items included in the printer carton Table 1-1 Items Included with the Printer Quantity Enclosed Items User’s guide 1 Driver diskette 1 Ribbon cartridge 1 Power cord 1 . Consumables Table 1-2 Consumables Part Number Consumable Item Ribbon cartridge S015083/S01 5086 Ribbon pack soloo31/sol 0033 .
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LQ-2070 Servioe Manual Product Description 1.2 Hardware Specifications This section provides detailed hardware specifications for the LQ-2070. 1.2.1 Printing Method . l?rintig method Impact dot matrix . Color . Number of pins Black 24 pins . Pin arrangement ● print Pin diameter 12x 2 staggered 0.2 mm (0.0079 inch) f)=108°* 0.2° J #2 ‘:~9Tf . ~1I18O') ~’~gd’re”’on — 1 T #4 0.141mm 7 (1/180’) +#6 ~ #7 *#8 +#9 3.
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Product Description LQ-2070 Service Manual 1.2.
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LQ-2070 Service Manual Product Description 1.2.3 Paper Handling Specifications ● Friction feed Push tractor feed Push and pull tractor feed Feeding method (front, rear) (front, rear) (front, rear, bottom) . Feeder Front push tractor(option), mar push tractor, CSFbin 1 /bin 2 (Option) Pull tractor (Option) and roll paper holder (Option) .
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Product Description LQ-2070 Service Manual Set the paper thickness lever to the appropriate position, as indicated in the following table. . Paper thickness lever Table 1-7 Paper Thickness Lever Positions Paper Thickness ( inches) Paper Thickness (mm) Lever Position Minimum Maximum Minimum Maximum o 0.0024 0.0047 0.065 0.12 1 0.0047 0.0075 0.12 0.19 2 0.0075 0.0102 0.19 0.26 3 0.0102 0.0126 0.26 0.32 4 0.0126 0.0142 0.32 0.36 5 0.0142 0.0157 0.36 0.40 6 0.0157 0.
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LQ-2070 Service Manual Product Description 4. Push-pull tractor feed release lever to the REAR PUSH/FRONT PUSH position. Load paper from the front or rear entrance. ● Remove the paper eject assembly and attach the pull tractor unit. ● Remove any slack in the paper between the platen and pull tractor. . Precisely adjust the horizontal position of the pull tractor and push tractor. . Multipart paper mustbe carbonless. . Do not perform reverse feeds greater than 1/6 inch. .
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LC?-2070 Service Manual ● Printable area Product Description Figure 1-3 shows the printable area for cut sheets. The table b;low defines the abbreviations used in the figure. Table 1-10 Printable Area for Cut Sheets Abbreviations Single Sheet Multipart PW (width) Refer to Table 1-8. Refer to Table 1-9. PL (length) Refer to Table 1-8. Refer to Table 1-9. LM (left margin) 3 mm (0.12”) or more (PW ~ 364 mm (14.33”)) 25 mm (0.98”) or more (PW = 420 mm (16.5”)) 3 mm (0.
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LQ-2070 Service Manual Product Description Envelopes and Card Stock ● The following tables gives specifications for envelopes and card stock. Paper/media specifications Table 1-11 Specifications for Envelopes Rear Entry Front Entry No. 6 envelopes I --- Width Maximum Minimum Maximum Minimum 166 mm (6.5”) Length * -- 92 mm (3.6”) !!5L_E& --- 240 mm (9.5”) ..- 104 mm (4.1”) Total thickness --- .... --- Quality 0.52 mm (0.
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Product Description LQ-2070 Service Manual ● The figure below shows the printable area for envelopes and card stock. Each ~bbreviation is defined-in the following table. - Printable area Table 1-13 Printable Area for Envelopes and Card Stock Envelopes Card Stock PW (width) Refer to Table 1-11. Refer to Table 1-12. PL (length) Refer to Table 1-11. Refer to Table 1-12. LM (left margin) 3 mm (0.1 2“) or more 3 mm (0.12”) or more RM (right margin) 3 mm (0.12”) or more 3 mm (0.
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LQ-2070 Service Manual Product Description Continuous Paper ● The following table gives specifications continuous paper. Paper/media specifications Table 1-14 Specifications for Continuous Paper (Single Sheet and Multipart) Front Entry Width Length Copies Total thickness Weight (not multipart) Weight (one sheet of a multipart form) Rear Entry Bottom Entry Minimum Maximum Minimum Maximum Minimum Maximum 101 mm 406 mm 101 mm 406 mm 101 mm 406 mm (4.0”) (16”) (4.0”) (16”) (4.
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Product Description LQ-2070 Service Manual ● The figure below shows the printable area for continuous paper. Each abbreviation is defined in the following table. Printable area Table 1-15 Printable Area for Continuous Paper I I Abbreviations Continuous Paper PW (width) Refer to Table 1-14. PL (length) Refer to Table 1-14. LM (left margin) 13 mm (0.51”) or more RM (right margin) 13 mm (0.51”) or more TM (top margin) 4.2 mm (0.17”) or more BM, (bottom margin) 4.2 mm (0.
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LQ-2070 Service Manuai Product Description Continuous Paper with Labels ● The following table gives the specifications for continuous paper with labels. Paper/media specifications Table 1-16 Specifications for Continuous Paper with Labels Rear Entry Front Entry Minimum Label size Maximum Minimum Base sheet length (one page) Base sheet thickness Total thickness 101 mm 406 mm (4.0”) (16”) 101 mm (4.0”) 559 mm (22”) 0.07 mm 0.09 mm (0,0028”) (0.0035) 0.16 mm (0.0063”) (0.
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Product Description Lt2-2070 Service Manual Roll Paper Note: Roll paper is not available in all models, and not available in the U.S. . Paper/media specifications The following table shows specifications for roll paper. Table 1-17 Specifications for Roll Paper I I I Rear Entry Front Entry Maximum Minimum Maximum Minimum Width --- 216 mm (8.5”) Length .-. .-. Thickness --- --- 0.07 mm (0.0028”) 0.09 mm (0.0035”) Weight ..- --- 52.
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LQ-2070 Service Manuai Product Description 1.2.5 Ribbon Specifications Table 1-19 Statistics on the Ribbon Specification Item Type Fabric Color Black Ribbon life 8 million characters (draft, 10 cpi, 48dotcJ character) Dimension 506.0 mm (W) x 123.5 mm (D) x 23.0 mm (H) 19.92” (W) X 4.86” (D) X .91 “ (H) 1.2.6 Electrical Specifications Tables 1-20 and 1-21 provide statistics on electrical ratings and consumption.
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Product Description LQ-2070 Service Manual 1.2.
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LQ-2070 Service Manual Product Description 1.2.10 CE Marking The following table lists CE marking information. Table 1-25 CE Marking Low Voltage Directive 73/23 / EEC EN60950 EMC Directive 89/336/ EEC EN55022 class B EN50082-1 , IEC801-2 IEC801-3 , IEC801-4 EN45501 Non-Automatic Weighing Instruments Directive 90/384/EEC 1.2.11 Physical Specifications Table 1-26 provides printer dimensions and weight. Table 1-26 Physical Specifications Dimensions Weight 639 mm (W) x402 mm (D) x 257 mm (H) 25.
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Product Description LQ-2070 Service Manual . Stacker capacity Table 1-28 Capacity of the Stacker CSF Bin 1 CSF Bin 2 Single sheets 140 sheets (+$ 1) 100 sheets (~ 2) ---- Envelopes 15 sheets (% 3) 28 sheets (% 4) ---- Card stock 30 sheets (% 5) ---- Multipart 36 sheets (3$6) ...
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LQ-2070 Service Manual Product Description 1.3 Firmware Specifications This section provides detailed information about LQ-2070 firmware. 1.3.1 Control Codes and Fonts ● Control codes ESC/P2 and IBM 2390/2391 plus emulations.
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Product Description LQ-2070 Service Manual 1.3.2 Interface Specifications This printer provides a bidirectional 8-bit parallel interface and a Type B optional interface slot, standard. 1.3.2.1 Parallel Interface (Fotward Channel) ● Transmission mode 8-bit parallel, IEEE-P1284, compatibility mode ● Adaptable connector ● Synchronization 57-30360 (Amphenol) or equivalent STROBE P1.lk BUSY and ACI@lLG signals . Handshaking ● ‘ITL compatible (IEEE-P1284 level 1.
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Product Description LC?-2070 Service Manual DATA ‘T R O B E ~tsetu~< BUSY 1 tstb ! p-r I & ! treadv~l> tbusy ACKNLG I I Figure 1-8 Data Transmission Timing Table 1-32 Maximum and Minimum Timings for Data Transmission Parameter Minimum Maximum setup 500 nsec -... thold 500 nsec ----- t stb 500 nsec ..... tready 0 -... tbusy -.. 500 nsec treply -.. -... tack 500 nsec 10 ~ tnbusy o -... tnext o -... ttout -.. 120 nsec ttin -..
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Product Description LQ-2070 Service Manual 1.3.2.2 Parallel Interface (Reverse Channel) IEEE-P1284 nibble mode Transmission mode . Adaptable comector ● Synchronization 57-30360 (Anphenol) or equivalent Refer to the IEEE-P1284 Specification . Handshaking Refer to the IEEE-P1284 Specification ● ● TILcompatible (IEEE-P1284 level 1 device) Signal level Refer to the specification .
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LQ-2070 Service Manual Product Description Extensibility request ● ● 00 H Request nibble mode of reverse channel transfer. 04 H Request device ID in nibble mode of reverse channel transfer. Refer to the following descriptions: Device ID ESC/P2 The printer responds to the extensibility request in the affirmative, when the request is 00 H or 04 H, which means: [00 H][32 H] . . . . . . MFG: EPSON, CMD: ESCPC2-00, MDL: LQ-2070, CLS: PRINTER IBM2391 ph.Is [00 H][33H] . . . . . .
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Product Description LQ-2070 Service Manual 1.3.3 Paper Handling Sequence In this section, paper handling firmware sequences are described in several cases. ● Printer status Printer is on line (not in the pause state). No PE sensor detects that paper is loaded. The release lever position is set to continuous paper. Table 1-34 Paper Handling Sequence 1 Result Occurrence Print command sent Continuous paper is loaded. Pause button pressed Printer enters pause state.
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LQ-2070 Service Manual Product Description . Printer status The front PE sensor detects that paper is loaded in the front paper path. The release lever is set to continuous paper Table 1-36 Paper Handling Sequence 3 Result Occurrence PAUSE button pressed Printer goes off or on line. LF/FF button rxessed Printer Derforms a line feed. LF/FF button held down continuously The printer performs a form feed after the line feed.
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Product Description LQ-2070 Service Manual ● Printer status The rear PE sensor detects that paper is loaded in the rear paper path. Release lever position is set to Fri&ion. Table 1-38 Paper Handling Sequence 5 Result Occurrence Pause button pressed Printer goes on or off line. LF/FF button pressed Printer performs a line feed. LF/FF button held down continuously Printer ejects paper forward after the line feed (except with roll paper).
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LC?-2070 Service Manual Product DescrhXion 1.3.4. Paper Width (PW) Sensor Operation The PW sensor is mounted on the ribbon mask holder to measure the paper width and detect the top edge of the paper. However, in cases where print data is over the paper width, the image cut function does not operate in all modes. This section describes when the image cut function is operational, as shown in the following table.
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Product Description LC?-2070 Service Manual 1.4 Operating Instructions This section provides detailed information about the LQ-2070 control panel buttons and LEDs. 1.4.1 Control Panel Operations The printer control panel contains 6 non-lock type push buttons and 8 LEDs for various printer functions. The exterior view of the control panel is shown in the following figure. ~ $ ~..!!. . . . . . . . . . . . . . . . . . . . ~comjen~ed, ~ ;-. :;: ;:::. Ii ❑ ❑ ❑ F~nt Tear . o.ff.:/ :!: :.
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LQ-2070 Service Manual Product Description ● Operations at power on Turning the printer on while pressing panel buttons executes the functions below: Table 1-42 Operation at Power On Function Button LQ self-test Load / Eject Draft self-test LF I FF Load I Eject and LF I FF Condensed Data dump Default setting Font and Tear Off / Bin Clear EEPROM Pause Bi-d adjustment Others Not available Font & Condensed Quiet mode . .
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Product Description LQ-2070 Service Manual 1.4.3 Micro Adjust Function The micro adjust function lets you set the TOF and tear off positions. After the printer is put in this mode, you can adjust the top of form (TOF) position up or down in increments of %16 inch by pressing the LF/FF or Load/Eject button. The adjusted TOF position is saved to *e EEPROM. If the printer is turned off, the setting is not cleared.
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LQ-2070 Sewice Manual Product Description 1.4.5 Self-test Function Pressing the Load / Eject button while turning on the printer puts the printer in LQ self-test mode. Pressing the LF/FF button while turning on the printer puts the printer in Draft self-test mode. You can stop the self-test temporarily by pressing the Pause button, and you can exit the self-test mode by turning off the printer. When pages are printed from the CSF, the first sheet is used for scaling the sheet length.
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Product Description LQ-2070 Service Manual 1.4.7 Default Setting Function Pressing the Pitch button while turning on the printer puts the printer in default setting mode. Some default printer settings can be changed in this operation. The method for setting defaults is described in the instruction sheets, which are printed out immediately after you enter the mode.
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Product Description LQ-2070 Service Manual 1.4.9 Bidirectional Adjustment Function Pressing the Pause button while turning on the printer puts the printer in bidirectional adjustment mode. In this mode, you can adjust the bidirectional alignment for the following three modes: 1. Draft mode 2. Draft copy mode 3. LQmode For instructions on performing the adjustment, see Chapter 4. 1.4.10 Quiet Mode Function Pressing the Font button while turning on the printer puts the printer in quiet mode.
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LC?-2070 Service Manual Product Description 1.6 MAIN COMPONENTS The main components of the LQ-2070 are designed for easy removal and repair. The main components are: 0 C186 MAIN Board Assembly 0C166PSB/PSE Board Assembly (120 V/230V) 0 C165 PNL Bowd Assembly 0 Printer Mechanism Cl HousingAssembly The following figure shows the main components of the LQ-2070. Rev.
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LQ-2070 Service Manual Product Description 1.6.1 C186 MAIN Board Assembly The C186 MAIN board consists of a TMP96C041AF CPU, an E05B13 gate array, a program/CG ROM, a PS-IWM, an EEPROM, etc. Head Driva TRANSISTOR ICI 1,14 PF Motor Driver TEA3718SDP IC 5 PS RAM 1 1 ~n D .H / IC12 CR Motor Driver SLA7024M \ IC 8 EEPROM ‘CN2 for Option I I F Figure 1-13 C186 MAIN Board Assembly 1.6.2 C166 PSB/PSE Board Assembly These boardshave two AC input voltage ratings: 120VAC (C166PSB) and230VAC (C166PSE).
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Product Description LQ-2070 Service Manual 1.6.5. Housing Assembly This consists of printer cover assembly, edge guide assembly, upper housing, lower housing assembly, etc. Figure 1:17 Housing Assembly 1-38 Rev.
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CHAPTER 2 Operating Principles Table of Contents 2.1 PRINTER MECHANISM OPERATION 2-1 2.1.1 Printing Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.1.2 Carriage Movement Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.1.3. Platen Gap Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 2.1.4 Paper Handling Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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List of Figures Figure 2-1. Principles of Printhead Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Figure 2-2. Carriage Movement Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Figure 2-3. Platen Gap Adjust Lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Figure 2-4. Release Sensor Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Figure 2-5. Friction Advance Operation Using the Top Entrance . . . . . . . . .
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LQ-2070 Service Manual Operating Principles 2.1 PRINTER MECHANISM OPERATION This section describes the printer mechanism and explains how it works. 2.1.1 Printing Mechanism The printing mechanism is composed of the printhead, ink ribbon, and ribbon mask. The printhead is an 24-pin (12 pins × 2) head for impact dot printing. To improve the durability of the dot wires, they are arranged on the printhead in 2 columns.
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Operation Principles LQ-2070 Servcie Manual 2.1.2 Carriage Movement Mechanism The carriage movement mechanism consists of the carriage assembly, carriage (CR) motor, timing belt, driven pulley, home position (HP) sensor, etc. The CR motor drives the timing belt. The carriage assembly is connected to the timing belt, which is moved by the CR motor. Figure 2-2 shows the carriage movement mechanism. The printer detects the carriage home position with the HP sensor.
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LQ-2070 Service Manual Operating Principles 2.1.3 Platen Gap Adjustment You can adjust the platen gap (the gap between the platen and printhead) to allow the printer to use paper of different weights or thicknesses. When you move the platen gap adjust lever forward or backward, the carriage guide shaft rotates. This rotation moves the carriage either toward or away from the platen and changes the platen gap.
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Operation Principles LQ-2070 Servcie Manual 2.1.4. Paper Handling Mechanisms During normal operation, paper is fed into the printer, advanced to the specified position, and then ejected from the printer. These paper-handling operations are performed by various paper handling mechanisms, such as tractors, platens, rollers, and gears. This section describes the printer’s paper handling mechanisms. 2.1.4.1.
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LQ-2070 Service Manual Operating Principles 2.1.4.2. Paper Advance Mechanism This section describes how the friction and tractor advance mechanisms work to move the paper through the printer. 1. Friction Advance Method Paper is held between the platen and the paper guide rollers and between the paper tension roller and paper tension unit cover. The paper feed (PF) motor pinion gear, turns in the direction of the black arrow, driving the paper advance reduction gear.
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Operation Principles LQ-2070 Servcie Manual 2. Push Tractor Method The push tractor method can be used with either the rear or front entrance. When the push tractor method is used with the rear entrance, the torque generated by the PF motor is transmitted to the push tractor gear through the PF motor pinion gear, paper advance reduction gear, and tractor reduction gear.
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LQ-2070 Service Manual Rev.
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Operation Principles LQ-2070 Servcie Manual 3. Pull Tractor Method The pull tractor advances paper in basically the same way as the push tractor. The push tractor is installed at the paper entrance and pushes paper into the printer. On the other hand, the pull tractor is installed at the paper exit and pulls paper out of the printer mechanism. As a result, the paper tension unit is not required. Figure 2-8 illustrates pull tractor operation when paper is fed through the bottom paper entrance. 2-8 Rev.
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LQ-2070 Service Manual Operating Principles 4. Push-Pull Tractor Method The push-pull tractor method is a combination of the push and pull tractor methods. Two tractors advance the paper: one at the front paper entrance and the other at the rear paper entrance. They operate simultaneously to push and pull the paper through the printer mechanism. Figure 2-9 illustrates push-pull tractor operation when paper is fed through the rear paper entrance.
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Operation Principles 2-10 LQ-2070 Servcie Manual Rev.
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LQ-2070 Service Manual Operating Principles 2.1.5 Paper Paths This section describes various paper paths through the printer mechanism. These paper paths are divided into four groups, depending on which entrance (top, rear, bottom, or front) is used to feed paper. The printer has two PE (paper end) sensors. The front PE sensor is located in front of the printer mechanism. The rear PE sensor is located behind the printer mechanism. See the figure below.
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Operation Principles LQ-2070 Servcie Manual 2. Rear Entrance Figures 2-13, 2-14, and 2-15 show the paper paths for tractor feeding using the rear entrance. You can use the rear entrance with any of the following paper feed methods: push tractor feed, pull tractor feed, or push-pull tractor feed. When you use the rear entrance, the rear PE sensor detects when paper is out.
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LQ-2070 Service Manual Operating Principles As shown above in Figure 2-15, when you use the pull tractor with this printer, you must remove the paper eject cover, which includes the paper tension roller, from the printer mechanism. 3. Bottom Entrance Figure 2-16 shows the paper path for tractor feeding using the bottom entrance. The bottom entrance is used only for pull tractor feed. When the bottom entrance is used, the front PE sensor detects when paper is out. Down Rev.
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Operation Principles LQ-2070 Servcie Manual 4. Front Entrance Figures 2-17 through 2-20 show the paper paths for the front entrance. The front entrance can be used with any of the following paper feed methods: friction feed, push tractor feed, pull tractor feed, or push-pull tractor feed. When the front entrance is used, the front PE sensor detects when paper is out. Up Up 2-14 Rev.
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LQ-2070 Service Manual Operating Principles Down Rev.
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Operation Principles LQ-2070 Servcie Manual 2.1.6 Ribbon Advance Mechanism The ribbon is held between the ribbon advance roller (ribbon driven gear) and the ribbon pressure roller. When the carriage moves from left to right and vice versa on the CR guide shaft, the timing belt turns the belt-driven pulley. Then the torque is transmitted to the ribbon driving gear through the gear trains.
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LQ-2070 Service Manual Operating Principles 2.2 POWER SUPPLY OPERATION The printer can be powered by either of two power supply boards: the C166 PSB (120 V) or C166 PSE (230 V) power supply. These boards are the same as the FX-2170. Additionally, the PSB and PSE boards function the same, except for a difference in primary circuitry. The power supply board outputs the DC current necessary to drive the printer control circuits and drive mechanism.
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Operation Principles LQ-2070 Servcie Manual 2.2.2 Power Supply Circuit Operation The power supply circuit is composed of an RCC (ringing choke converter) system and the power switch circuit in the secondary circuitry. The power supply circuit has several protection and control circuits. This section describes these circuits. 1. Power Switch Circuit The power switch circuit is in the secondary circuitry. It is shown in the illustration below.
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LQ-2070 Service Manual Operating Principles 3. +35 V Constant Voltage Control Circuit The +35 V constant voltage control circuit is illustrated below. 11 C15 C13 Q1 R11 10+ +35V Line R20 R15 R21 Q3 Q2 R19 R16 ZD51 ZD81 ZD82 ZD83 ZD84 ZD85 R13 R14 C12 + IC1 9+ GND Line R56 8 1 7 2 D81 R57 Figure 2-25 +35 V Line Constant Voltage Control Circuit The constant voltage control circuit operates to keep the 35 V line at 35 V ± 6 %. When the voltage between ZD51 and ZD85 becomes 32.7 V ± 2.
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Operation Principles LQ-2070 Servcie Manual 5. +35 V Line Over Current Protection Circuit The +35 V line over current control circuit is illustrated below. R54 +35V Line R70 D85 Q53 R71 R72 R73 GND C57 R74 Q31 R75 3 6 Q54 4 R68 5 Q82 PSC Figure 2-27 +35 V Line Over Current Protection Circuit When the +35 V line becomes less than 27 V, Q82 and Q54 turn on, and PC1 turns on. Consequently, Q32 and Q31 turn off, and then switching FET Q1 shuts off.
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LQ-2070 Service Manual Operating Principles 7. +5 V Line Constant Voltage Control Circuit The +5 V line constant voltage control circuit is shown below. +35V R81 R60 R59 L51 Q51 GND R53 +5v Line ZD55 R88 R61 GND R51 D51 16 R64 + 15 - 8 R65 GND IC51 TL494CN Figure 2-29 +5 V Line Constant Voltage Control Circuit Port 16 of IC51 (TL494CN) monitors the + 5 V line, and the voltage is compared with the standard voltage, which is input into port 15. When the voltage of port 16 goes below 4.
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Operation Principles LQ-2070 Servcie Manual 2.3 CONTROL CIRCUIT The control circuit consists of the C186 MAIN board assembly and C165 PNL board This section describes the major components and explains how the boards work. 2.3.1 Overview of Control Circuit Operation The printer’s control circuit includes a TMP96C041AF CPU that runs at 17.
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LQ-2070 Service Manual Operating Principles The following figure shows the data flow from the host computer to the printhead. Data sent from the host computer is converted to image data and transmitted to the printhead through the gate array.
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Operation Principles LQ-2070 Servcie Manual 2.3.2 System Reset Circuit Control circuits IC1 and IC2 are initialized when a RESET signal (LOW level) is output from port 1 (VOUT) of IC10. IC10 monitors the +5 V line on port 3, and resets under the following conditions: IC2 E05B24YA +5V RESET 61 R47 1K IC1 0 PST5 9 2 0 I C1 TP M9 6C04 1A F +5V VOUT 1 23 RESET MRES 2 VCC 3 GND 4 C16 0 .1 U Figure 2-32 Reset Circuite 1. When the power supply is turned on, a RESET signal is output.
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LQ-2070 Service Manual Operating Principles 2.3.4 CR Motor Driver Circuit The CR motor driver circuit is shown below.
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Operation Principles LQ-2070 Servcie Manual 2.3.5 PF Motor Driver Circuit The figure below shows the PF motor driver circuit.
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LQ-2070 Service Manual Operating Principles 2.3.7 Sensor Circuits The CPU detects conditions of the following sensors: home position (HP) sensor, release sensors 1 and 2, platen gap (PG) sensor, rear and front paper end (PE) sensors, paper width (PW) sensor.
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CHAPTER 3 Disassembly and Assembly Table of Contents 3.1 OVERVIEW 3.1.1 Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1.2 Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1.3 Service Checks After Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1.4 Specifications for Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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List of Figures Figure 3-1. Screw Types and Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 Figure 3-2. Flowchart for Disassembling the Printer . . . . . . . . . . . . . . . . . . . . . . 3-4 Figure 3-3. Before Starting Disassembly Procedures . . . . . . . . . . . . . . . . . . . . . 3-5 Figure 3-4. Removing the Panel Board Assembly . . . . . . . . . . . . . . . . . . . . . . . 3-6 Figure 3-5. Lock Cover for CN1 and the FFC . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Figure 3-48. Removing the Gear Train Cover . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3-49. Engaging 5 Gears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3-50. Removing the E-ring and 2 CBS Screws. . . . . . . . . . . . . . . . . . . Figure 3-51. Removing the Paper Feed Roller Cover . . . . . . . . . . . . . . . . . . . . 3-31 3-31 3-32 3-32 List of Tables Table 3-1. Recommended Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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LQ-2070 Service Manual Disassembly and Assembly 3.1 OVERVIEW This section describes various points to note when disassembling and assembling the printer. 3.1.1 Precautions Follow the precautions below for disassembly or assembly. WARNING Before disassembling, assembling, or adjusting the printer, disconnect the power supply cable from the AC power socket. Failure to do so can cause physical injury. The power switch is wired in the secondary circuitry.
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Disassembly and Assembly LQ-2070 Service Manual 3.1.3 Service Checks After Repair Before returning the printer after service, use the check list in Table 3-3, which provides a record to make servicing and shipping more efficient. Table 3-3.
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LQ-2070 Service Manual Disassembly and Assembly 3.1.4 Specifications for Screws Table 3-4 lists the abbreviations used in the following sections for small parts, such as screws and washers. Table 3-4.
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Disassembly and Assembly LQ-2070 Service Manual 3.2. PRINTER DISASSEMBLY AND ASSEMBLY This section describes procedures for disassembling and assembling the main components of the printer. When the procedure for installing a component is simply the reverse of removing the component, this chapter does not describe the assembly procedure. If necessary, special notes on assembling or adjusting a component are given at the end of the description of each procedure.
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LQ-2070 Service Manual Disassembly and Assembly 3.2.1. Before Starting Disassembly Procedures 1. Remove the following parts: . ➮ Front edge guide assembly ➅ Front cover ➆ Bottom cover ➬ Rear edge guide assembly ➉ Printer cover ➴ Paper eject assembly ➄ Front/rear tractor assembly ➦ Ribbon cartridge Refer to the following figure.
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Disassembly and Assembly LQ-2070 Service Manual 3.2.2. Removing the Panel Board Assembly 1. Remove the printer cover and ribbon cartridge (see Section 3.2.1). 2. Release the left clips for the panel board assembly by pushing them from the cutout located on the inside front of the upper housing assembly. 3. Release the flexible flat cable (FFC) by pulling the lock cover for CN1, and then disconnect the FFC for CN1 from the C165 PNL board assembly. 4.
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LQ-2070 Service Manual Disassembly and Assembly 3.2.3. Removing the Printhead 1. Remove the printer cover and ribbon cartridge (see Section 3.2.1). 2. Remove 2 CBS screws (3 × 10, F/Zn) securing the printhead to the CR assembly. 3. Remove the printhead from the CR assembly. 4. Disconnect 2 wide FFCs from the printhead and then disconnect the narrow FFC from the connector on the CR cover.
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Disassembly and Assembly LQ-2070 Service Manual 3.2.4 Removing the HP Sensor 1. Remove the printer cover, ribbon cartridge, front edge guide, and front cover (see Section 3.2.1). 2. Disconnect the connector cable for the HP sensor. 3. Remove the HP sensor by pushing up and releasing the 2 clips at the bottom of the HP sensor from the front paper entrance. 2 Clips for HP Sensor Figure 3-8 Removing the HP Sensor Assembly Note Notice the direction for mounting the HP sensor. 3.2.
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LQ-2070 Service Manual Disassembly and Assembly Assembly Notes Mount the PW sensor assembly onto the ribbon mask holder groove, aligning the bottom line of micro photo sensor to the bottom line of the groove. Whenever you remove the PW sensor assembly, clean the surface of the sensor by wiping it with a soft material. If the surface is not clean, abnormal operations may occur, such as printing on the platen surface. The tightening torque for the CB screw (2.5 × 5, F/Zn) = 0.08 ~ 0.12 Nm (0.8 ~ 0.
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Disassembly and Assembly LQ-2070 Service Manual 3.2.6 Removing the Platen Assembly 1. Remove the printer cover, ribbon cartridge, and platen knob (see Section 3.2.1). 2. Release both locks for the left and right bushings (8 mm) by pushing the lever holder for the bushings outside, and then pulling the holder lever forward. Left and Right Bushings (8mm) Figure 3-11 Releasing the Locks for the Bushings 3 Slide the platen assembly to the right, and move the printhead to the right edge. 4.
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LQ-2070 Service Manual Disassembly and Assembly 3.2.7 Removing the Upper Housing Assembly 1 Remove the rear edge guide assembly, paper eject assembly, rear tractor unit, and printer cover (see Section 3.2.1). 2. Remove the panel board assembly (see Section 3.2.2). 3. Remove 4 CBB screws (4 × 14, F/Zn) securing the upper housing assembly. 4. Remove the platen knob. 5.
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Disassembly and Assembly LQ-2070 Service Manual 3.2.8 Removing the CR Motor Assembly 1 Remove the rear edge guide assembly, paper eject assembly, rear tractor unit, and printer cover (see Section 3.2.1). 2. Remove the panel board (see Section 3.2.2) and upper housing assembly (see Section 3.2.7). 3. Remove the 2 CR mounting screws securing the CR motor assembly. After releasing the extension spring (15.7 g), disengage the timing belt from the CR motor assembly. 4.
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LQ-2070 Service Manual Disassembly and Assembly 3.2.9 Removing the Printer Mechanism 1. Remove the rear/front edge guide assembly, front cover, paper eject assembly, rear/front tractor units, and printer cover (see Section 3.2.1). 2. Remove the panel board assembly (see Section 3.2.2) and upper housing assembly (see Section 3.2.7). 3. Remove 3 CBS screws (3 x 4,F/Zn), 2 CBB screws (3 X 12,F/Zn) securing the upper shield plate the main board, and remove the upper shield plate. 4.
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Disassembly and Assembly LQ-2070 Service Manual 3.2.9.1 Removing the PF Motor 1. Remove the rear/front edge guide assembly, front cover, paper eject assembly, rear/front tractor unit, and printer cover (see Section 3.2.1). 2. Remove the panel board (see Section 3.2.2) and upper housing assembly (see Section 3.2.7). 3. Remove the printer mechanism (see Section 3.2.9). 4. Remove the CBS screw (3 × 6, F/Zn) and CB screw (3 × 8, F/Zn) securing the PF motor. 5.
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LQ-2070 Service Manual Disassembly and Assembly 3.2.9.2 Removing the PG Sensor Assembly 1. Remove the rear/front edge guide assembly, front cover, paper eject assembly, rear/front tractor unit, and printer cover (see Section 3.2.1). 2. Remove the panel board (see Section 3.2.2) and upper housing assemblies (see Section 3.2.7). 3. Remove the printer mechanism (see Section 3.2.9 ). 4. Remove the hexagon nut (standard, M4) securing the PG sensor assembly to the right frame assembly.
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Disassembly and Assembly LQ-2070 Service Manual 3.2.9.3 Removing the Right Frame Assembly 1. Remove the rear/front edge guide assembly, front cover, paper eject assembly, rear/front tractor unit, and printer cover (see Section 3.2.1). 2. Remove the panel board (see Section 3.2.2) and upper housing assembly (see Section 3.2.7). 3 Remove the printer mechanism (see Section 3.2.9 ), CR motor assembly (see Section 3.2.8), PF motor, (see Section 3.2.9.1), and PG sensor assembly (see Section 3.2.9.2 ). 4.
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LQ-2070 Service Manual Disassembly and Assembly 2. Remove the right sub frame from the right frame assembly by disconnecting CN16 from the MAIN board assembly. 3. C186 Remove the following 11 parts from the right frame assembly. 2 compression springs (200 g) 2 plain washers (8.2 x 0.5 x 15, S/Na) 2 spur gears (34.5 mm) 1 spur gear (34 mm) 1 combination gear (8 mm, 30 mm) 1 intermittent gear 1 spur gear (21 mm) 1 spur gear (27 mm) Assembly Notes Adjust the bidirectional print alignment.
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Disassembly and Assembly LQ-2070 Service Manual Assembly Notes When you engage the release lever and release lever transmission to the tractor clutch cam, notice the points in the following figure. The tightening torque for the CBS screws (3 × 6, F/Zn) and (3 × 8, F/Zn) 0.78 ~ 0.98 Nm (8 ~ 10 Kg - cm) The tightening torque for the hexagon nut (standard, M4) = 1.18 ~ 1.37 Nm(12 ~ 14 Kg f - cm) Notice how the intermittent gear, release lever, and release lever transmission are engaged.
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LQ-2070 Service Manual Disassembly and Assembly 3.2.9.5 Removing the Left Frame Assembly 1. Remove the rear/front edge guide assembly, front cover, paper eject assembly, rear/front tractor unit, and printer cover (see Section 3.2.1). 2. Remove the panel board assembly (see Section 3.2.2), upper housing assembly (see Section 3.2.7), and then remove the printer mechanism (see Section 3.2.9 ). 3. Remove 2 CBS screws (3 × 6, F/Zn) securing the platen cover (both right and left side). 4.
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Disassembly and Assembly LQ-2070 Service Manual 3.2.9.6 Removing the Ribbon Drive (RD) Assembly 1. Remove the rear/front edge guide assembly, front cover, paper eject assembly, rear/front tractor unit, and printer cover (see Section 3.2.1). 2. Remove the panel board (see Section 3.2.2) and upper housing assembly (see Section 3.2.7). 3. Remove the printer mechanism (see Section 3.2.9). 4. Remove the left frame assembly (see Section 3.2.9.5). 5.
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LQ-2070 Service Manual Disassembly and Assembly 3.2.9.7 Removing the CR Assembly 1. Remove the rear/front edge guide assembly, front cover, paper eject assembly, rear/front tractor unit, and printer cover. 2. Remove the panel board (see Section 3.2.2) and upper housing assembly (see Section 3.2.7) . 3. Remove the printer mechanism (see Section 3.2.9 ). 4. Remove the left frame assembly (see Section 3.2.9.5) and RD assembly (see Section 3.2.9.6). 5.
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Disassembly and Assembly LQ-2070 Service Manual Assembly Notes Insert the timing belt properly into the 2 holding slots at the bottom of the CR assembly. Take up the timing belt slack between the two slots completely, as shown in the following figure. Insert the 2 oil pads into the proper positions in the CR assembly, as shown. If you remove the rear CR guide shaft along with the CR assembly, be sure to reinstall the rear CR guide shaft in the printer mechanism.
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LQ-2070 Service Manual Disassembly and Assembly 3.2.9.8 Removing the Rear PE Sensor Assembly 1 Remove the rear/front edge guide assembly, front cover, paper eject assembly, rear/front tractor unit, and printer cover. 2. Remove the panel board (see Section 3.2.2) and upper housing assembly (see Section 3.2.7). 3. Remove the printer mechanism (see Section 3.2.9). 4. Turn the printer mechanism over, and insert a standard screwdriver or other prying tool into hole in the rear frame shown in the figure.
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Disassembly and Assembly LQ-2070 Service Manual 3.2.10 Removing the C186 MAIN Board Assembly 1. Remove the rear/front edge guide assembly, front cover, paper eject assembly, rear/front tractor unit, and printer cover (see Section 3.2.1) 2. Remove the panel board (see Section 3.2.2) and upper housing assembly (see Section 3.2.7). 3. Disconnect the following connectors from the C186 MAIN board assembly.
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LQ-2070 Service Manual Disassembly and Assembly 3.2.11 Removing the C166 PSB/E Board Assembly 1. Remove the rear/front edge guide assembly, front cover, paper eject assembly, rear/front tractor unit, and printer cover. 2. Remove the panel board (see Section 3.2.2) and upper housing assembly (see Section 3.2.7). 3. Remove the 5 CBB screws (3 × 12, F/Zn) securing the C166 PSB/E board assembly. 4. Disconnect the cable for CN3 on the C186 MAIN board assembly. 5.
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Disassembly and Assembly LQ-2070 Service Manual 3.3. Disassembly and Assembly of CSF Bin 1 This section describes procedures for disassembling and assembling the optional cut sheet feeder. In general, you can install a component in the CSF simply by reversing the procedure for removing it. Therefore, this section does not describe assembly procedures in most cases. If necessary, special notes on assembling a component are given at the end of the description of each procedure. 3.3.
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LQ-2070 Service Manual Disassembly and Assembly Assembly Notes Be careful of the cable alignment for the CN1 connector cable and earth cables. Align those cables as shown in the following figure. If these cables is not aligned properly, the CSF gear cover cannot be assembled properly. Right CSF Frame Connector CN1 Connector CN2 Figure 3-39 Cable Alignment Use the following figure to assemble the 13 gears onto the right CSF frame.
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Disassembly and Assembly LQ-2070 Service Manual 3.3.2 Disassembling Paper Support Block Assembly 1. Remove the CSF gear cover. Refer to step 1 in Section 3.3.1. 2. Remove the stepping motor. Refer to steps 2 and 3 in the Section 3.3.1. 3. Remove the E-ring fixing the right edge of the paper feed shaft. Figure 3-41 Removing the E-ring 4. Remove 1 gear (29 mm) from the right edge of the paper feed shaft. Paper Feed Shaft Gear(29 mm) Figure 3-42 Removing 1 Gear (29 mm) 5.
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LQ-2070 Service Manual Disassembly and Assembly Figure 3-44 Removing the Paper Support Block Assembly 7. Remove the paper support assembly along with the paper support shaft and paper shaft holder by pulling upward. 8. Remove both paper feed rollers from both paper support assemblies. Paper Support Assembly Paper Loading Roller Cover Figure 3-45 Removing the Paper Loading Roller Cover Assembly 9.
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Disassembly and Assembly LQ-2070 Service Manual Figure 3-46 Removing the Paper Eject Assembly Cover Thin Plastic Film Figure 3-47 Assembling the Paper Eject Assembly Cover 3-30 Rev.
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LQ-2070 Service Manual Disassembly and Assembly 3.3.3 Removing the Paper Eject Assembly Cover 1. Remove the paper eject assembly cover by releasing 2 clips located along both edges of the paper eject assembly cover, as shown in the following figure.
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Disassembly and Assembly LQ-2070 Service Manual 3.4 Disassembly and Assembly of CSF Bin 2 3.4.1 Disassembling the Right Side Block E- ring CTPB Screw (3x8) Right CSF Frame Figure 3-50 Removing 1 E-ring and 2 CTBS Screws 1. Remove the gear train cover by releasing the 4 clips shown in the following figure. 2. Remove the following 5 gears and 1 spring from the right CSF frame. Assembly Note Pay attention how the 5 gears are engaged. Refer to the following figure.
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LQ-2070 Service Manual Disassembly and Assembly 3.4.2 Disassembling the Paper Support Block Assembly 1. Remove 1 E -ring fixing the paper feed roller shaft to the right CSF frame. 2. Remove 2 CTBS (3 × 8) screws securing the paper support shaft to both right and left CSF frames. 3. Remove both paper support assemblies along with the paper feed roller shaft and paper support shaft. 4. Remove the paper feed shaft from both paper support assemblies by pulling them toward the right or left side. 5.
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Disassembly and Assembly 3-34 LQ-2070 Service Manual Rev.
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CHAPTER 4 Adjustments Table of Contents 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 4.2.1 Platen Gap Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2.2 Bidirectional Print Alignment Adjustment . . . . . . . . . . . . . . .
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LQ-2070 Service Manual Adjustment 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.
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Adjustment LQ-2070 Service Manual 4.2 ADJUSTING AND RESETTING THE PRINTER 4.2.1 Platen Gap Adjustment If you have rotated or reassembled the rear CR guide shaft or parallelism adjustment bushing, or if printing is light or dark, even at the proper PG lever position, perform this adjustment with the printer in 3 positions: the 5th, 80th, and 130th columns. 1. Remove the printhead from the CR assembly (see Section 3.2.3). 2.
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LQ-2070 Service Manual 9. Adjustment Insert a thin screwdriver into the drilled hole at the right edge of the rear CR guide shaft and adjust the platen gap by moving the screwdriver forward or backward until the gap is large enough for a 0.38 mm thickness gauge but too narrow for a 0.41 mm thickness gauge. 10. When the gap is correct at the 5th column, check the platen gap at the 80th, and then the 130th column positions. Figure 4-3 Platen Gap 11.
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Adjustment LQ-2070 Service Manual 4.2.2 Bidirectional Print Alignment Adjustment This section describes the procedure for adjusting the bidirectional print alignment, required after mechanism repair. This procedure is also necessary if you replace the main board assembly or EEPROM, because the adjusted value is written to the EEPROM on the C186 MAIN board. You can perform the adjustment from the Settings Diskette, using the control panel, or with a remote utility.
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LQ-2070 Service Manual Adjustment < BI-D adjustment > Cancel [ ESC] > Mode 1 = Mode 2 = 0 Mode 4 = 0 Print [SPACE] Speed ] [ 0 Value [ ] Write [ RET ] Default [HOME] Figure 4-8 Bi-d Adjustment Menu 10. Highlight the mode by moving the cursor with the ↑ or ↓ key, and then print the current Bi-d print alignment pattern for that mode by pressing SPACE. Mode 1 VR = 0 Figure 4-9 Current Bi-d Alignment 11.
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Adjustment LQ-2070 Service Manual 4.2.2.2 Bi-d Print Alignment Adjustment from the Control Panel 1. Turn the printer on while pressing the PAUSE button to put the printer into Bi-D adjustment mode. 2. The printer prints out a guide sheet, containing 25 patterns in Draft mode. To adjust your printer, follow these steps 1. Look for the alignment pattern that is most closely alignment and press the LF/FF or the Load/Eject button until the lights indicate the appropriate pattern number as shown below. 2.
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LQ-2070 Service Manual Adjustment 4.2.3 Factory Settings This section describes the procedure to reset factory settings, which is necessary if the main board or EEPROM is replaced. You can perform this procedure only with the Settings Diskette. Notes: • After you select factory settings in the Factory Setting File menu, be sure to run the “Check Pro. (FF)” program in the Main Menu. Running the “Check Pro. (FF)” to writes the selected factory settings to the EEPROM and prints several check patterns.
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Adjustment LQ-2070 Service Manual 4.2.4 TPE Level Reset This section describes the procedure to reset the TPE (top paper end) level. This operation is required when the PW sensor assembly is replaced, and if it is not performed, the printer does not recognize that the PW sensor has been replaced, which limits the ability of the new sensor to operate. This reset operation can be performed only from the Settings Diskette.
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Chapter 5 Troubleshooting Table of Contents 5.1 OVERVIEW 5-1 5.2 TROUBLESHOOTING INFORMATION 5.2.1 PRINTHEAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2.2 SENSORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2.3 MOTORS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2.4 ERROR CODES WITH THE INDICATORS AND BUZZER . . . . . . . . . . . .
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LQ-2070 Service Manual Troubleshooting 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. 5.2 TROUBLESHOOTING INFORMATION This section gives troubleshooting information to let you check test points for replaceable units. 5.2.1 Printhead 5-1.
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Troubleshooting LQ-2070 Service Manual 5.2.2 Sensors Table 5-2 Sensor Test Points Sensor Connector Number CN4 (HP Sensor) Test Pin Number 1: HP Test Method Meter Reading (Set Meter to DC Voltage. ) Place one lead on pin 1 and the other lead on pin 2, and check the voltage while blocking the two sensor terminals.
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LQ-2070 Service Manual Troubleshooting 5.2.3 Motors Table 5-3 Motor Test Points Test Method Motor Connector Number Common Pin Number Test Pin Number CR Motor CN11 5 1, 2, 3, 4 Place one lead on pin 5 and the other lead on each of 4 test pins. 2.7 Ω ± 10 % (at 25° C, 77° F) 1, 2, 3, 4 Place one lead on pin 1 and other lead on pin 3. Place one lead on pin 2 and other lead on pin 4. 16 Ω ± 10% (at 25° C, 77° F) PF Motor CN10 — (Set Meter to Ohms.
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Troubleshooting LQ-2070 Service Manual 5.3 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. Table 5-5. Symptoms and Problem Descriptions Symptom Problem Description Flowchart No. Abnormal CR Operation • Carriage does not move at all.
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LQ-2070 Service Manual Troubleshooting 1. Abnormal CR Operation START When the printer was powerd on, dose the CR motor rotate ? NO Is the Connector CN 11 connected correctly ? NO Connect the CN 11 correctly YES Dose the CR motor stop during or after initilization ? NO Check the resistance of the motor coils. See Table 5-3. NO Is the trouble removed ? YES YES YES Whe n you move the CR manually wih the power off, dose it move freely ? NO Is it OK? END NO Replace the C186 MAIN Board.
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Troubleshooting LQ-2070 Service Manual 2. Abnormal Paper Feed Operation 1 START Dose the PFmotor rotate? Is CN10 connected correctly? No No Connect it correctly. YES YES When the printer is powered on, is paper ejected automatically? No No Go to flowchart 2-1.
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LQ-2070 Service Manual Troubleshooting 2. Abnormal Paper Feed Operation 2-1 Continued from flowchart 2. Wh en paper is loaded, is it ejected automatically? Is cut-sheet paper loaded correctly, but continuous paper not loaded at all ? NO YE S YES NO Is CN7 connected correctly ? Connect CN7 correctly. YES NO Is the problem corrected ? YE S Is CN12 or CN16 connected correctly ? YE S NO Connect CN12 or CN16 correctly.
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Troubleshooting LQ-2070 Service Manual 3. Abnormal Control Panel Operation START D os e the Operate button turn power on and off? NO Check the Operate button on the control panel using a mutometer. YES Do the control panel buttons function OK? NO Is the Operate button OK? Check them using a multimeter. NO Replace the PNL board. YES YES NO Are they OK? NO Replace the PNL board.
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LQ-2070 Service Manual Troubleshooting 4. Abnormal Printing START Is the selftest excecuted correctly ? Date received from the host is not printed correctly. YES NO Are all the dosts printed OK? YES Are any wires in the printhead broken? NO NO YES Do all the LEDs on the control panel blink at power on? YES Are printer settings correct? YES Check printhead, motors drivers and power supply with a meter. Replace any bad parts.
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Troubleshooting LQ-2070 Service Manual 5.4 REPAIRING C166 PSB/PSE BOARD ASSEMBLY This section provides instructions to repair a defective power supply board assembly. It describes various symptoms, likely causes, and checkpoints. Checkpoints refer to proper waveforms, resistances, and other values to check when evaluating the operation of any potentially faulty component. Check these values and take the appropriate action.
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LQ-2070 Service Manual Q1 is dead. Troubleshooting Check that the resistance between the source and drain is infinite. Check the voltage waveform between the source and drain of the Q1. Replace the Q1. ^ PC1 is dead. Rev.A Check the voltage waveform between pins 3 and 4 of the PC1. Replace PC1.
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Troubleshooting LQ-2070 Service Manual Table 5-6. Repairing the C166 PSB/PSE Board Assembly (Continued) Problem Cause Checkpoint Solution The 35 V and 5 V lines are not output when the printer is powered on. Q32 is dead. Check that the resistance between the collector and emitter is infinite. Replace the Q32. ^ Q31 is dead. Check that the resistance between the source and drain is infinite. Replace the Q31. Check the voltage waveform at pin 8 of IC51.
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LQ-2070 Service Manual Troubleshooting 5.5 REPAIRING THE C186 MAIN BOARD ASSEMBLY This section provides instructions to repair the C186 MAIN board assembly. It describes various problems, symptoms, likely causes, and solutions. The checkpoint column provides proper waveforms, resistance values, and other information for each component of C186 MAIN. Note: This information is necessary only for servicers who repair to the component level.
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Troubleshooting LQ-2070 Service Manual Table 5-7. Repairing the C186 MAIN Board Assembly Problem Cause Checkpoint Check the oscillator signal at pins 26 or 27 of the CPU The printer does not operate at all. Solution If the signal is not correct, replace IC1 ( or replace the main board). Otherwise, replace CRU1. CRU1 is defective. Check input signal waveform (CH1) at pins 6, 5, 17, and 16 of IC1. Check output signal waveform (CH2) at pins 8, 1, 18, and 11 of IC12.
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LQ-2070 Service Manual Troubleshooting Table 5-7. Repairing the C186 MAIN Board Assembly Problem Cause IC1 is defective. or IC2 is defective. or IC11 or IC14 is defective. Checkpoint Check input signal waveform at 8 pin on the both IC11 and IC14. Check output signal waveform at 1 and 15pin on the both IC11 and IC14.(CH1) Paper feed is abnormal. IC1 is defective. Check the output signal waveform at pin 15 of IC1. Solution If the input signal is not correct, replace IC1 or IC2.
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Troubleshooting LQ-2070 Service Manual 5.6 REPAIRING THE PRINTER MECHANISM This section provides instructions for repairing the printer mechanism. It describes various problems, symptom, likely causes, checkpoints, and solutions. The checkpoint column shows items to be checked, including proper values to be set for each component of the printer mechanism. For replacement and adjustment instructions, see Chapter 3, Disassembly and Assembly, and Chapter 4, Adjustments.
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LQ-2070 Service Manual Troubleshooting Table 5-8. Repairing the Printer Mechanism Problem Symptom Cause Checkpoint Solution A foreign object is jammed between both terminals of the HP sensor. Check the HP sensor. Remove the any foreign object. CN4 connector removed from the HP sensor. Check the connection of the connector. Connect the CN4 correctly. The HP sensor is defective. Check the operation of the HP sensor. Refer to page 5-2. Replace the HP sensor.
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Troubleshooting LQ-2070 Service Manual Table 5-8. Repairing the Printer Mechanism Problem Symptom Cause Checkpoint Solution CN10 is disconnected from the main board. Check CN10. Connect CN10 correctly. The both rear and front PE sensors are not mounted correctly. Check the both sensors mounting position. Mount the rear and front PE sensors into the proper positions. Check the both paper paths. Remove any foreign object. A foreign substance is sticking to the surface of the PW sensor.
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LQ-2070 Service Manual Troubleshooting Table 5-8. Repairing the Printer Mechanism Problem Abnoraml paper feed. ^ Symptom Cause Checkpoint CN12 or CN16 is not connected correctly. Check the connector. Refer to page 3-19. Connect the CN12 or CN16 correctly. Check the operation of the release sensor. Refer to page 5-2. Replace the release sensor. The ribbon cartridge is defective. Remove the ribbon cartridge.
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CHAPTER 6 Maintenance Table of Contents 6.1 PREVENTIVE MAINTENANCE 6-1 6.2 APPLYING LUBRICATION 6-1 List of Figures Figure 6-1. Lubrication Points 1 and 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 6-2. Lubrication Point 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 6-3. Lubrication Point 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 6-4. Lubrication Points 5, 6, and 7 . . . . . . . . . . .
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LQ-2070 Service Manual Maintenance 6.1 PREVENTIVE MAINTENANCE Preventive maintenance includes regular cleaning of the exterior case using denatured alcohol, as well as occasional vacuuming of the mechanism interior to remove dust and paper debris. After cleaning the unit, check that it is adequately lubricated, as described in Section 6.2, below. Before returning the printer to the customer, inspect springs, paper-feed rollers, and basic operation.
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Maintenance LQ-2070 Service Manual Cam, Clutch, Tractor Spur Gear, 34.5 : Lubrication Point Ref. No.(1) : Lubrication Point Ref. No.(3) Figure 6-1. Lubrication Points 1 and 3 Gap Adjust Lever Platen Gap Adjustment Slot Lubricate all these slots Lubrication Point Ref. No. (2) Figure 6-2. Lublication Point 2 6-2 Rev.
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LQ-2070 Service Manual Maintenance : Lubrication Point Ref. No. 4 Figure 6-3. Lubrication Point 4 : Lubrication Point Ref. No.(5) : Lubrication Point Ref. No.(6-1) : Lubrication Point Ref. No.(6-2) : Lubrication Point Ref. No.(7) Figure 6-4. Lubrication Points 5, 6,and 7 : Lubrication Point Ref.No.8 Figure 6-5. Lubrication Points 8 Rev.
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Maintenance 6-4 LQ-2070 Service Manual Rev.
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Appendix Table of Contents A.1. EXPANDED PRODUCTION COMMANDS A-1 A.2. EEPROM ADRESS MAP A-2 A.3 CONNECTOR SUMMARY A-5 A.4 CIRCUIT DIAGRAMS A-11 A.5 CIRCUIT BOARD COMPONENT LAYOUTS A-17 A.6 EXPLODED DIAGRAMS A-20 A.7. PARTS LIST A-26 List of Figures Figure A-1. Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5 Figure A-2. C186 MAIN Board Assembly Circuit Diagram. . . . . . . . . . . . . . . . A-11 Figure A-3. C166 PSB Board Assembly Circuit Diagram.
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Table A-15. Connector Pin Assignments - CN16 . . . . . . . . . . . . . . . . . . . . . . . . A-9 Table A-16.Parts Comparison Between LQ2070,LQ2170 and FX2170 . . . . . A-10 Table A-17.Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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LQ-2070 Service Manual Appendix A.1 EXPANDED PRODUCTION COMMANDS 1.
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Appendix LQ-2070 Service Manual A.
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LQ-2070 Service Manual Address Appendix Data Data Format Default 1EH Reserved 1FH Pitch direction setting 0: Bi-d, 1: Uni-d 00H 20H I/F mode selection 0: Auto I/F Selection, 1: Parallel I/F, 2: Type-B I/F 00H (Auto) 21H Auto I/F wait time setting 10: 10 Sec., 30: 30 Sec., 00: 10 Sec. 0AH (10 sec.
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Appendix LQ-2070 Service Manual Address Data Data Format Default 2BH Manual insertion wait time 3 to 30 (by 0.1 sec.), 00H: 2 sec. when Normal mode. (same as default) 3sec.when Copy mode.(same as default) 00H (2or 3 sec.) 2CH 1 Tear-off wait time 3 to 30 (by 0.1 sec.) , 00H: 3 sec. (same as default) 00H (3 sec.
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LQ-2070 Service Manual Appendix A.3 CONNECTOR SUMMARY Figure A-1 illustrates how primary components are connected. Table A-1 summarizes functions and sizes of the connectors. Printer Mechanism PF Motor CR Motor PG Sensor Board Assy., C166 PSB / PSE Release Lever Position Sensor PE- Rear Sensor PE- Front Sensor HP Sensor PW Sensor Printhead Board Assy., C165PNL CN1 CN 15 CSF Bin 1 CN 14 CN8 CN9 CN7 CN4 CN6 C N 5 C N1 2 C N1 3 C N1 1 C N1 0 CN 16 Board Assy.
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Appendix LQ-2070 Service Manual Table A-1.
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LQ-2070 Service Manual Appendix Table A-5. Connector Pin Assignments – CN6 Pin I/O 1 2 I —- Signal Name PE GND Function Front paper end signal Signal GND Table A-6. Connector Pin Assignments - CN7 Pin I/O 1 2 3 4 I ———- Signal Name E GND +5V A Function TOP paper end signal Signal GND +5 VDC line +5 VDC line Table A-7. Connector Pin Assignments – CN8 Rev.
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Appendix LQ-2070 Service Manual Table A-8. Connector Pin Assignments – CN9 Pin I/O 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 O O O O O — — — O O O O O O O Signal Name HD3 HD11 HD2 HD19 HD7 +35V +35V +35V HD22 HD15 HD11 HD23 HD10 HD14 HD6 Function Head data 3 Head data 11 Head data 2 Head data 19 Head data 7 +35 VDC line +35 VDC line +35 VDC line Head data 22 Head data 15 Head data 11 Head data 23 Head data 10 Head data 14 Head data 6 Table A-9.
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LQ-2070 Service Manual Appendix Table A-13. Connector Pin Assignments – CN14 Pin I/O 1 2 3 4 5 6 7 8 9 10 ——O —O O ——O O Signal Name +35V +5V HOLD +35V -A B GND GND A -B Function +35 VDC line +5 VDC line CSF motor hold signal +35 VDC line CSF motor phase -A CSF motor phase B Signal GND Signal GND CSF motor phase A CSF motor phase -B Table A-14.
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Appendix LQ-2070 Service Manual Table A-16 Parts Comparison Between LQ2070, LQ 2170 and FX 2170 LQ - 2070 (24pins) LQ -2170 (24pins) FX - 2170 (9pins) Main Board C186 C165 C165 PSB/PSE Board C166 C165 C165 Cover Open Sensor X O O PG sensors 1 1 2 Release Lever Sensors Located at both sides 2 on left side 2 on left side CR Motor EM-248 (AM0083) EM-241 EM-241 PF Motor EM-247 EM-242 EM-247 EM-243 EM-249 O: Available. X: Not available. A-10 Rev.
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Appendix LQ-2070 Service Manual A.7.PARTS LIST Table A-17 Part No. Reference Table Ref. No. Description Parts Price List Name 100 Lower Housing Housing Assy,.Lower 101 Front Cover Cover,Front 102 Upper housing Housing,Upper 103 Rear Printer Cover Cover, Printer,Rear 104 Printer Cover Cover,Assy.,Printer 105 Font Edge Guide Edge Guide Assy.,Front 106 Rear Edge Guide Edge Guide Assy.
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LQ-2070 Service Manual Appendix Table A-17 Part No. Reerence Table (Continue) Ref. No. Description Parts Price List Name 130 Ferrite Core Ferrite Core 133 C.B.S.-Tite Screw C.B.S.-Tite Screw 137 Upper Grounding I/F Plate Grounding Plate, I/F,Upper 200 Main Board Assembly Board Assy., Main (For Europe) 200 Main Board Assembly Board Assy.,Main 300 Power Supply Board Assembly Board Assy.,Power Supply 300 Power Supply Board Assembly Board Assy.
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Appendix LQ-2070 Service Manual Table A-17 Part No. Reference Table(Continue) Ref. No. Description Parts Price List Name 531 Rear PE Sensor Detector Assy., Rear 532 Lower Paper Feed Driven Roller Roller,PF, Driven, Lower 533 Paper Feed Roller Assembly Roller Assy., PF 534 Extension Spring, 70 Extension Spring,70 535 Compression Spring,10.8 Compression Spring,10.8 536 Carriage Assembly Carriage Assy.
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LQ-2070 Service Manual Appendix Table A-17 Part No. Reference Table(Continue) Ref. No. Description Parts Price List Name 569 Left Bushing (8mm) Bushing, 8 Left 570 Platen Platen 571 Platen Gear Platen Gear 572 Right Bushing (8mm) Bushing, 8 Right 573 Platen Cover Cover,Platen 574 PW Sensor Assembly Detector, Assy.
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Appendix LQ-2070 Service Manual Table A-17Part No. Reference Table (Continue) Ref. No. Description Parts Price List Name 604 Oil Pad Oil Pad 605 PG Sensor Holder Holder,Detector,PG 606 Release Sensor Lever Lever, Release, Detector 607 Paper Guide Middle Grounding Plate Grounding Plate, Paper Guide, Middle 608 Release Sheet Sub Cap Sheet, Release, Cap, Sub 609 Cable Holder Holder,Cable 610 Driven Pully Cover Cover, Driven Pulley 611 C.B. Screw (M3 X8) C.B.
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LQ-2070 Service Manual Appendix Table A-17 Parts No. Reference Table (Continue) Ref. No Description Parts Price List Name 641 C.B.S. Screw C.B.S Screw 642 C.F.P-Tite Screw, 2.6 X 8, F/Zn C.F.P.-Tite Screw, 2.6X8, F/Zn 643 Hexagon Nut Hexagon Nut 644 C.B.S. Screw C.B.S. Screw 650 Print Head Print Head, DH24-0A-0 Rev.
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EPSON