Epson FX 1170 - B/W Dot-matrix Printer Service Manual
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Epson FX 1170 - B/W Dot-matrix Printer Service Manual

Epson FX 1170 - B/W Dot-matrix Printer Service Manual

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EPSON
EPSON TERMINAL PRINTER

SERVICE MANUAL

4001461

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  • Page 1: Service Manual

    EPSON EPSON TERMINAL PRINTER FX-870/1170 SERVICE MANUAL 4001461 REV.-A...
  • Page 2 However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them. “ The above notwithstanding SEIKO EPSON can assume no responsibility for any errors in this manual or the consequences thereof. @ Copyright 1992 by SEIKO EPSON CORPORATION...
  • Page 3 THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS. WARNING REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN. MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE.
  • Page 4 Includes a step-by-step guide for product disassembly and assembly. Chapter 4 - Includes a step-by-step guide for adjustment. Chapter 5 - Provides Epson-approved techniques for troubleshooting. Chapter 6 - Describes preventive maintenance techniques. The contents of this manual are subject to change without notice. iv -...
  • Page 5 , . : ; : : \ REVISION SHEET REVISON DATE ISSUED CHANGE DOCUMENT June 15, 1992 1st issue ‘ ? : * (“ .7,, -v–...
  • Page 6 REV.-A TABLE OF CONTENTS CHAPTER 1. GENERAL DESCRIPTION CHAPTER 2. OPERATING PRINCIPLES CHAPTER 3. DISASSEMBLY AND ASSEMBLY CHAPTER 4. ADJUSTMENTS TROUBLESHOOTING CHAPTER 5. CHAPTER 6, MAINTENANCE APPENDIX – vi -...

  • Page 7: Table Of Contents

    REV.-A CHAPTER 1 GENERAL DESCRIPTION 1.1 Scope ....................... . 1.1.1 Features .
  • Page 8 REV.-A 1.6 Main Components ~~ti...m-.--.--...--.-.m.m..-.mm.........1-28 1.6.1 BOARDASSEMBLY,C094MAlN(Main ControlCircuitBoard) ....1-29 1.6.2 BOARDASSEMBLY,C094PNL(Control Pand~HtiWd) ..-.l-3O 1.6.3 BOARD ASSEMBLY, C076PSBFSE (Power SuPPIY circuit Board) ..1 -30 1.6.4 Printer Mechanism ................1-31 1.6.5 Housing Assembly .
  • Page 9 REV.-A LIST OF TABLES Table 1-1. Line Feed Speed (1 line= 1/6”) ............1-5 Table 1-2.

  • Page 10: Scope

    REV.-A Scope EPSON FX-87WI 170 dot matrix Printer. These specifications apply to the 1.1.1 Features Upward compatibility with the FX-850(+)/1050(+), FX-800/1000, FX-86e/286e 380 cps (high-speed draft for both 80 and 136-column models) 285 cps (draft pica), 342 CPS (draft elite)
  • Page 11 REV.-A r~..“ 80-column model 136-column model Figure 1-1. External View of the FX-870/1170 . ,.

  • Page 12: Options

    REV.-A 1.1.2 Options Plain cut sheet feeder ( 80-column) C806371 (U.S. version) Plain cut sheet feeder ( 80-column) C806372 (other) Plain cut sheet feeder (136-column) C806391 (U.S. version) Plain cut sheet feeder (136-column) C806392 (other) Cut sheet feeder ( 80-column) C806381 (U.S.

  • Page 13: Specifications

    REV.-A 1.2 Specifications 1.2.1 Hardware Specifications 1.2.1.1 Printing Method Impact dot matrix Printing method: Pin configuration: 9 wires (diameter 0.29 mm) wire 2+--- - - 0.35mm (lf12”) ‘ - - - - - - - 9& Figure 1-2. Pin Configuration 9 x 7 matrix (high-speed draft) Dot matrix: 9 x 9 matrix (draft)
  • Page 14 REV.-A Table 1-1. Line Feed Speed (1 iine = 1/6”) Continuous feed Intermittent feed Thin Thick Thin Thick Type of paper ms (ips) ms (ips) 55 (3.0) 66 (2.5) Fanfold paper 45 (3.7) 55 (3.0) Cut sheet (manual) 48 (3.5) 55 (3.0) Cut sheet (CSF) Thickness is less than or equal to 0.18 mm.

  • Page 15: Paper Specifications

    REV.-A 3) Pull tractor feed Set the release lever to the PULL position. Load the paper from the front, rear, or bottom entrance. (The front or bottom entrance is recommended for thick paper or labels.) Release the friction feed mechanism. Remove the paper-tension unit and attach the pull tractor unit.

  • Page 16: Table 1-4. Specifications For Continuous Paper

    REV.-A - . . - . - .,. . . , —--i m . —— m, -— ..L . -. A,.- — R- --– 1 ame 1-s. specmcawons lor uu~ mee~s [eamomess uupncamng raper] -A -,- - —A— ,-— Width 80-column 182-257 mm (7.2-10.1”) front insertion...

  • Page 17: Table 1-6. Specifications For Labels

    REV.-A “:% Table 1-6. Specifications for Labels 2 1/2” 15/16” Size 4“ 15/16” 4“ 17/16” 0.07-0.09 mm (0.0028-0.0031”) - base paper Thickness 0.16-0.19 mm (0.0063-0.0075”) - total Plain paper Quality Notes: 1) Labels must be fanfold. AVERY CONTINUOUS FORM IABELS 2) Example of labels AVERY MINI-LINE LABELS 3) Labels should be used with the pull tractor (front, bottom), or with the front push tractor.

  • Page 18: Printable Area

    REV.-A 1.2.1.4 Printable Area 1) Cut sheets 148-257 mm (5.8-10.1”): 80 columns top insertion 148-420 mm (5.8-16.5”) : 136 columns 182-257 mm (7.2-10.1”): 80 columns front insertion 182-364 mm (7.2-14.3”): 136 columns > < Printable Area < T“ WXYZ ~ ABCD WXYZ I ABCD Figure 1-3.

  • Page 19: Figure 1-4. Printable Area For Continuous Paper

    REV.-A 2) Continuous paper < > *1 , Printable Area < ABCD WXYZ ABCD WXYZ Figure 1-4. Printable Area for Continuous Paper *1 13 mm (0.51”) or more when the paper width is 101 mm to 241 mm (4” to 9.5”). 25 mm (1.0”) or more ~~. when the paper width is 254 mm (10”).

  • Page 20: Ribbon Cattridge

    REV.-A 3) Roll paper (80-column model only) 216 +/- 3 mm (8.5 +/- 0.12”) top insertion 101-254 mm (4-10”): 80 columns 101-406 (4-16”): 136 columns > Printable Area WXYZ .--0. % WXYZ ABCD Figure 1-5. Printable Area for Roll Paper *1 3.0 mm (0.1 2“) or more Note:...

  • Page 21: Electrical Specifications

    REV.-A c- .., 1.2.1.6 Electrical Specifications See Table 1-8 and 1-9. Table 1-8. Electrical Specifications for 120V Model 120 VAC Rated voltage 103.5-132 V AC Input voltage range 50-60 Hz Rated frequency range 49.5-60.5 Hz Input frequency range 1.8 A...

  • Page 22: Reliability

    REV.-A 1.2.1.8 Reliability 5 million lines (excluding a printhead) MCBF (MCBF: Mean Cycles Between Failures) 4000 power on hours (duty cycle 80-column model 25Yo) — MTBF (expected value) 6000 power on hours (duty cycle 25Yo) —136-column model (MTBF : Mean Time Between Failures) 100 million characters (14 dots/character) Printhead Life 1.2.1.9 Safety Approvals...

  • Page 23: Input Data Buffer

    REV.-A f’ : . .,’;: Table 1-11. Character Size and Pitch .,.- Type letters I Width I Height Character pitch [mm] [mm] [mm] Pica 2.54 (10 cpi) 1.05 1.48 (17 cpi) Condensed 2.11 (12 cpi) Elite 1.27 (20 cpi) Condensed elite 0.85 Table 1-12.

  • Page 24: Interface

    REV.-A , 1.3 Interface This printer has a built-in, 8-bit centronics parallel interface. 1.3.1 Parallel Interface 8-bit parallel Data transmission mode Controlled by external STROBE pulse. Synchronization Controlled by ACKNLG and BUSY signals. Handshaking ITL- compatible Logic level 57-30360 (Amphenol) or equivalent Connector plug It is recommended that the interface cable be as short as possible (10 feet maximum).
  • Page 25 REV.-A (Continued) e . - . . . , . . . Signal Return Signal Dir. Description Pin No. Pin No. Name Approx.12 us pulse. LOW indicates that data has been ACKNLG received and that the printer is ready to accept more data. A HIGH signal indicates that the printer cannot receive more BUSY data.

  • Page 26: Optional Interface

    REV.-A Optional Interface , 1.3.2 The following interface cards can be used for this printer. Table 1-15. Optional Interface Type Catalog # Serial I/F card C82305* (inch screw) C82306* (inch screw) Serial l/F card C82307* (inch screw) 32KB intelligent serial l/F card C82308* (inch screw) 32KB intelligent serial l/F card 32KB intelligent parallel l/F card...

  • Page 27: Buttons

    REV.-A , : . , 1.4.2 Buttons [PAUSEI Selects printing or pause alternately when there is some data to print in the input buffer. Advances continuous paper to tear-off position when the printer has printed all received data and is ready to receive more print data.

  • Page 28: Indicators

    REV.-A Advances the paper forward by 1/108 inch per step. IFONTl+[pApER F E E D I Moves the paper backward by 1/108 inch per step. Pressing FONT along with PAUSE or PAPER FEED lets you micro-adjust the following positions: the loading position, immediately after paper is loaded in the printer. the tear-off position, when paper has been advanced for tear off.

  • Page 29: Functions

    REV.-A .!. ,,. , Functions Default Settings 1.5.1 Users can set certain default parameters, which will be used at printer initialization. To change the parameters shown in Table 1-16, Group 1 Features, follow the steps below. Turn on the printer while pressing the FONT button. Then, the current default settings will be printed on the paper loaded in the paper path.
  • Page 30 REV.-A I ault$ I - Iu. -g uup m rcacul ca READY Feature Setting FONT COND. ESC/P Emulation IBM Proprinter Pica BLINKS Character pitch Elite Page length 11 inch 12 inch 8.5 inch 70/6 inch (A4) No skip BLINKS Skip over perforation Skip 1 inch BLINKS Zero face...
  • Page 31 REV.-A Table 1 7. Group 2 Features (ESC/P Mode) CG table COND. READY FONT Italic U. S. A.(std. setting) France BLINKS Germany U.K. Denmark BLINKS I Sweden BLINKS Italy BLINKS BLINKS Spain BLINKS Character table PC437 PC850 BLINKS PC860 . . . PC863 PC865 PC437 Greek...

  • Page 32: Power On Default Settings

    REV.-A 1.5.2 Power On Default Settings The printer also lets you change some of its power on parameters. To change the settings shown in Table 1- 19, Group 3 Features (Power on settings), follow the steps below. 1. Turn on the printer while pressing the PAUSE, PAPER FEED, and FONT buttons. 2.

  • Page 33: Self Test

    REV.-A Self Test 1.5.5 Press the PAPER FEED button while turning on the printer to put the printer in self-test mode. To stop the self test, turn off the printer. (The control panel is still operational in self-test mode for paper handling and font selection.

  • Page 34: Sheet Loading And Sheet Ejection

    REV.-A 1.5.10 Sheet Loading and Sheet Ejection The release lever engages or disengages the push-tractor unit drive mechanism. The lever’s operation provides with improved paper-handling functions: (a) Automatic cut sheet loading without the cut sheet feeder Move the release Ievertothe FRICTION position and load a sheet using the paper guide (top or optional front). A few seconds later, the sheet is automatically loaded to the top-of-form position, and the printer becomes ready to print.

  • Page 35: Printer Initialization

    REV.-A (3rd step) Position 1 $ \ \ &’” r’ Platen Gap Adjust Lever Figure 1-10. Lever Positions 1.5.12 Printer Initialization The printer is initialized in the following cases. (1) When the printer is turned on. (2) When the INIT signal or CMREQ (optional l/F ) is input. When the printer is initialized, it performs the following functions: The printhead returns to the leftmost position (carriage home).

  • Page 36: Buzzer

    REV.-A 1.5.13 Buzzer The buzzer beeps for 0.1 second at a time. These beep sounds a recombined in various ways, as shown below, to indicate different meanings. In the following table, each “*” stands for one beep. Table 1-21. Buzzer Functions Sound and Description Status BEL code...

  • Page 37: Housing Assembly

    REV.-A . : :, \ . 1.6 Main Components f’ The components of the FX-870/l 170 are for easy removal and replacement during maintenance designed and repair. The main components are: BOARD ASSEMBLY, C094 MAIN BOARD ASSEMBLY, C094 PNL BOARD ASSEMBLY, C076 PSB/PSE Printer Mechanism Housing Assembly The following figure shows the main components of the FX-870/l 170.
  • Page 38 REV.-A C094 MAIN (Main Control Circuit Board) q.6.I ASSEMBLY, BOARD Basically, the same board layout is used in both the 136-column model and the 80-column model. The CPU It consists of a TMP90C041F 8-bit CPU, an on this board controls all the main functions of the printer. E05A55YA gate array, an E2PROM, a PSRAM, a MASK ROM, motor drivers, and head drive transistors.
  • Page 39 REV.-A BOARD ASSEMBLY, C094 PNL (Control Panel Circuit Board) 1.6.2 K’. *“ This board functions as the control panel of the FX-870/l 170, and consists of a power switch, three function switches, and three indicator LEDs. Figure 1-13. BOARD ASSEMBLY, C094 PNL (Control Panel Circuit Board) 1.6.3 BOARD ASSEMBLY, C076 PSB/PSE (Power Supply Circuit Board) This board is composed of an input filter circuit, a transforming circuit, a switching regulator circuit, a rectifying circuit, a smoothing circuit, and various protecting circuits.
  • Page 40 REV.-A 1.6.4 Printer Mechanism The printer mechanism consists of a 9-pin impact dot head, a carriage mechanism, a carriage motor, a paPer feed mechanism, a paper feed motor, a ribbon feed mechanism, and various sensors. <136-column <80-column model> Figure 1-15. Printer Mechanism 1-31...
  • Page 41 REV.-A 1.6.5 Housing Assembly The printer mechanism and all the boards are contained in a housing assembly that consists of the uppercase and the lower case. Printe Upper Lower .-,. . {’ , . . : . . : ; Front Co Figure 1-16.
  • Page 42 REV.-A CHAPTER 2 OPERATION PRINCIPLES Mechanism Operation ............... . 2-1 2.1 Printer Printhead Mechanism .
  • Page 43 REV.-A LIST OF FIGURES c’ .’% Figure 2-l. Howthe Printhead Works .~.--..-..-......2-2 Figure 2-2. Carriage Operation ....- -~...f~~.~~..~.~~.-.----~~..- 2-3 Figure 2-3. Platen Gap Adjust Lever ..............2-4 Figure 2-4.

  • Page 44: Printer Mechanism Operation

    REV.-A 2.1 Printer Mechanism Operation This section describes the printer mechanism of the FX-870/l 170 printer and explains how the printer works. The FX-870/l 170 printer mechanism features a 9-pin impact dot printhead for seriaI Printin9. It has four main parts: 1) the printhead mechanism, 2) the carriage movement mechanism, 3) the paper feed mechanism, and 4) the ribbon advance mechanism.
  • Page 45 REV.-A c . , . - . . - - - Figure 2-1 shows the action of the printer mechanism when a single dot is printed. “ Platen Ribbon Mask Dot Wire Wire Resetting Spring Stopper .ctuatlngT:-Rbf)cl Paper B$l=lieaclDrivingCOil Actuating Plate Spring Figure 2-1.

  • Page 46: Carriage Mechanism

    REV.-A ‘ 2.1.2 Carriage Mechanism The timing belt is connected to the lower side of the carriage. With the printhead installed, the carriage moves either direction along the carriage guide shaft. The carriage (CR)motor (a stepping motor) drives the timin9 belt which moves the carriage.

  • Page 47: Platen Gap Adjustment

    REV.-A 2.1.3 Platen Gap Adjustment &>., Theplatengap (the gap between the platen andtheprinthead) can beadjustedto allowthe printerto use paper a of differentweights orthicknesses. When the platen gap adjust lever is moved 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.

  • Page 48: Paper Handling Mechanisms

    REV.-A 2.1.4 Paper Handling Mechanisms During normal operation, the paper is fed to the printer, advanced to the specified position, and ejected from the printer. These paper handling operations are performed by various paper handling mechanisms, such as the tractors, platens, rollers, and gears. This section describes the printer’s paper handling mechanisms. 2.1.4.1 Paper Feed Mechanisms Cut sheets are fed by friction.

  • Page 49: Paper Advance Mechanisms

    REV.-A 2.1.4.2 Paper Advance Mechanisms ,> -, , > This section describes how the friction advance and tractor advance mechanisms work to advance the PaPer . . . through the printer. (1) Friction Advance Method The paper is held between the platen and paper guide rollers and between the paper tension roller and paper tension unit cover.
  • Page 50 REV.-A (2) push Tractor Method 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.
  • Page 51 REV.-A Paper (Continuous) & \ /RollerGe~~ Motor, Paper Advance Reduction Gear Drive Roller Gear Push Tractor Push Tractor Gear Figure 2-6. Push Tractor Operation Using the Front Paper Entrance . ,.-...
  • Page 52 REV.-A (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 the paper into the printer mechanism. The pull tractor, however, is installed at the paper exit and pulls the paper out of the printer mechanism.
  • Page 53 REV.-A (4) push-pull Tractor Method : .’ The push-pull tractor method is a combination of the push and pull tractor methods. Two tractors are used to 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.
  • Page 54 REV.-A Paper (Continuous) Pull Tractor Paper Drive Roller Pull Tractor Gear A Tractor Reduction Gear 1 PF Motor Pinion Gear . ’ < Motor, PF Paper Advance Reduction Gear — ‘ . Platen Gear Paper Drive Roller Gear Push Tractor Gear Push Tractor Figure 2-9.
  • Page 55 REV.-A o . ; . - (5) Release Lever The release lever is used to select friction or tractor feeding or release the paper. When the release lever is set to the friction feed position, the paper guide rollers are pressed against the platen. When it is set to one of the tractor feed positions, this pressure is released and the paper guide rollers are separated from the platen.

  • Page 56: Paper Paths

    REV.-A 2.1.4.3 Paper Paths This section describes the various paths the paper follows through the printer mechanism. The various paper paths are divided into four groups depending on the entrance (toPt rear, bottomf or front) the PaPer is fed from” Note: The front PE (paper-end) detector is located in front of the printer mechanism and the rear PE detector is located behind the printer mechanism.
  • Page 57 REV.-A (2) Rear entrance ~~:., Figures 2-13 and 2-14 show the paper paths fortractorfeeding using the rear entrance. The rear entrance can be used with any of the following paper feed methods: the push tractor feed method, the pull tractor feed method, or the push-pull tractor feed method.
  • Page 58 REV.-A Paper (Continu Printhead ctor ear) Paper Guide Rollers Figure 2-15. Paper Path for Push-pull Tractor Feeding Using the Rear Entrance (3) Bottom entrance Figure 2-16 shows the paper path fortractorfeeding using the bottom entrance. The bottom entrance is used only for pull tractor feeding.
  • Page 59 REV.-A ~:>1 (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: the friction feed method, push tractor feed method, pull tractor feed method, or push-pull tractor feed method.
  • Page 60 REV.-A Paper (Continuous) Paper Drive Roller Detector, PE (Front) \ Lower Paper Guide Roller Figure 2-19. Paper Path for Pull Tractor Feeding Using the Front Entrance Paper (Continuous) Paper Drive Roller Lower Paper Guide Roller Detector, PE (Front) Push Tractor Figure 2-20.

  • Page 61: Ribbon Advance Mechanism

    REV.-A Ribbon Advance Mechanism 2.1.4 i... The ribbon is held between the ribbon advance roller (ribbon driving gear) and the ribbon pressure roller. ‘ “ ” When the carriage moves ontheshaft, the timing belt turns the belt driven pulley, andthetorque is transmitted to the ribbon driving gear through the train of gears.

  • Page 62: Power Supply Operation

    REV.-A 2.2 Power Supply Operation The FX-870/l 170 printer is powered by either of the two power supply boards: 120 VAC power supply board (BOARD ASSEMBLY, C076 PSB) or 220/240 VAC power SUPPIY board (BOARD ASSEMBLY, C076 pSE). These boards output the DC current necessary to drive the printer control circuits and the printer drive mechanism. Fuse F1 (2.5A/125 V for C076 PSB or 1.25 lV250 V for C076 pSE) is used to Protect the Power suPPIY circuit of each board in case of a short circuit.

  • Page 63: Power Supply Circuit Operation

    REV.-A 2.2.2 Power Supply Circuit Operation , , : , . ., < Figure 2-22 shows the power supply circuitry in block diagram form. When AC power enters the printer from an external power source, the filter circuit removes the noise. The AC voltage then undergoes full wave rectification and is smoothed to produce direct current.
  • Page 64 REV.-A Primary Secondary Full Wave < Smoothing Switching + 3 5 VDC — Smoothing Rectification Circuit Circuit Circuit Circuit +5 v + +5 VDC Switching Regulator l------ ....Filter Circuit Over Current Control Circuit...

  • Page 65: Control Circuit Operation

    REV.-A 2.3 Control Circuit Operation The control circuit consists of two circuit boards: the C094 MAIN (the main control circuit board) and the C094 PNL (the control panel circuit board). This section describes the operation of these boards. 2.3.1 Control Circuit Operation Overview The CPU on the C094 MAIN is the 8-bit TM P90C041F microprocessor (9.83 MHz).
  • Page 66 REV.-A Figure 2-24 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. - - - - - - - - - ~ Input buffer Print data...
  • Page 67 REV.-A Table 2-4 lists the functions of the main components of the C094 MAIN. Table 2-5. Functions of Main Components of C094 MAIN Functions IC or Circuit Receives data from the host computer and loads it to the input buffer in RAM. TMP90C041F (2C1) Expands the input data held in the buffer to create image data.

  • Page 68: Reset Circuit

    REV.-A 2.3.2 Reset Circuit The control circuits are initialized when the RESET signal is issued. The reset operation occurs under these two conditions: (1) Power on reset Immediately after the power is turned on, +35 VDC is rapidly generated. Because it takes a moment for the voltage at ZD2 to reach +31.5 V, the voltage at the DISC terminal on the gate array does not reach +5 VDC until capacitor C24 is fully charged.

  • Page 69: Sensor Circuits

    REV.-A .> ~ Sensor Circuits 2.3.3 The FX-870/l 170 printer has the following sensors: CRHOME, pE (FRONT), pE (REAR), pG (platen 9ap), RELEASE LEVER, and HEAD TEMPERATURE. All the sensors are momentary switches, except the PE (REAR) sensor, which is a photo diode, and the HEAD TEMPERATURE sensor, which is a thermistor. In addition to the sensor circuits, the +35 V monitor circuit and the Vref circuit are also provided.

  • Page 70: Carriage Motor Drive Circuit

    REV.-A 2.3.4 Carriage Motor Drive Circuit The carriage motor drive circuit controls the CR motor. An open loop, constant current drive arrangement runs the CR motor. 2-2 and 1-2 phases are used to excite the motor. A 2-2 phase step is equivalent to a 1-2 phase step doubled.

  • Page 71: Paper Feed Motor Drive Circuit

    REV.-A 2.3.5 Paper Feed Motor Drive Circuit . , , . , The PF motor (a stepping motor) is used to advance the paper. The minimum advance rate is 1/216 inch. The motor is a 2-2 phase, constant voltage drive motor. CPU ports (P70 to P73) are used to control the PF motor. Phase data for the PF motor are outputted through these ports.

  • Page 72: Printhead Drive Circuit

    REV.-A 2.3.6 Printhead Drive Circuit The printhead drive circuit receives two types of signals; image data and the pulse length control signal. Image data is created in the CPU, transferred to the gate array, and latched to the printhead. The pulse length control signal is set by the CPU.

  • Page 73: E2Prom Control Circuit

    REV.-A E2PROM Control Circuit 2.3.8 “4 c’ Figure 2-31 shows the E2PROM control circuit. The E2PROM is non-volatile memory containing information . . such asthetop-of-form position. Because the E2PROM is a serial 1/0 device, the gate array converts the parallel data (sent from the host computer) into serial data.
  • Page 74 REV.-A CHAPTER 3 DISASSEMBLY AND ASSEMBLY 3.1 Overview ......................3-1 3.1.1 Precautions .
  • Page 75 REV.-A LIST OF FIGURES Figure 3-1. Flowchart for Disassembling the Printer ........3 -4 Figure 3-2.

  • Page 76: Overview

    REV.-A 3.1 Overview This section describes the information you need to know before you disassemble or assemble the printer. 3.1.1 Precautions Follow the precautions below before you disassemble or assemble the printer. WARNING Before disassembling, assembling, or adjusting the printer, disconnect the power supply cable from The power switch is wired in the the AC power outlet.

  • Page 77: Service Checks After Repair

    REV.-A 3.1.3 Service Checks After Repair Before you send the printer back to the customer, fill in the checklist in Table 3-3 to note the current state of the components. This checklist facilitates servicing and shipping. Table 3-3. Inspection Checklist for Repaired Printer Items to Check Is Check Required? Category...

  • Page 78: Screw Specifications

    FHI.-A 3.1.4 Screw Specifications for small parts, such as screws and washers. Tables 3-4 and 3-5 list these This chapter uses abbreviations abbreviations. Table 3-4. Abbreviations Used for Screws Part Name Abbreviation Cross-recessed Bind head B tight screw Cross-recessed Bind head C tight screw Cross-recessed Bind head N tight screw Cross-recessed Bind head S tiaht screw Table 3-5.

  • Page 79: Disassembly And Assembly

    REV.-A 3.2 Disassembly and Assembly This section describes the procedures for disassembling and assembling the main components of the ““ printer. In general, you can install a component in the printer by simply reversing the procedure for removing the component. Therefore, this chapter does not describe assembly procedures in most cases. If necessary, special notes on assembling or adjusting a component are given at the end of the description of each procedure.

  • Page 80: Pre-Disessembly Procedures

    REV.-A 3.2.1 Pre-disassembly Procedures Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. [STEP 11 Front Cover Figure 3-2. Removing the PAPER GUIDE ASSEMBLY Note: Remove the paper eject cover and the tractor unit by pushing and releasing the hooks at both sides.

  • Page 81: Removing The Panel Unit

    REV.-A 3.2.2 Removing the PANEL UNIT [STEP Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover and tractor unit. (See Section 3.2.1.) [STEP 21 Push the two clips on the bottom of the panel unit and remove the PANEL UNIT. [STEP 3] Remove the flexible flat cable (FFC cable).

  • Page 82: Removing The Printhead

    REV.-A 3.2.3 Removing the PRINTHEAD Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. [STEP 1] (See Section 3.2.1.) the FFC cable from the PRINTHEAD. Remove the two CBS (M3X8) screws and [STEP 21 Remove the PRINTHEAD.

  • Page 83: Removing The Housing Assembly, Upper

    REV.-A Removing the HOUSING ASSEMBLY, UPPER 3.2.4 “.:?. Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover and tractor unit. [STEP (See Section 3.2.1.) Remove the PANEL UNIT. (See Section 3.2.2.) [STEP 21 Remove the three CBC (M4X15) screws securing the HOUSING ASSEMBLY, UppER. (There are [STEp only two screws in the 80-column printer.) [STEP...

  • Page 84: Removing The Printer Mechanism

    REV.-A 3.2.5 Removing the PRINTER MECHANISM Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover and tractor unit. [STEP 11 (See Section 3.2.1.) [STEP 21 Remove the PANEL UNIT. (See Section 3.2.2.) Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) [STEP 31 [STEP 41 Remove the four CBB (M4X12) screws securing the PRINTER MECHANISM.

  • Page 85: Removing The Platen Assembly

    REV.-A 3.2.5.1 Removing the PLATEN ASSEMBLY [STEP 1] Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover and tractor unit. (See Section 3.2.1.) [STEP 21 Remove the PANEL UNIT. (See Section 3.2.2.) - Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) [STEP 31 [STEP 4] Remove the two CBS (M3X8) screws securing the COVER, PLATEN.

  • Page 86: Removing The Frame Assembly, Rear

    REV.-A 3.2.5.2 Removing the FRAME ASSEMBLY, REAR [STEP 11 Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover and tractor unit. (See Section 3.2.1.) Remove the PANEL UNIT. (See Section 3.2.2.) [STEP 2] Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) [STEP 31 Remove the PRINTER MECHANISM.

  • Page 87: Removing The Motor Assembly, Cr

    REV.-A 3.2.5.3 Removing the MOTOR ASSEMBLY, CR ..,., , Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. ‘ [STEP (See Section 3.2.1.) [STEP 2] Remove the PANEL UNIT. (See Section 3.2.2.) Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) [STEP 3] Remove the face screw (M3X7) securing the MOTOR ASSEMBLY, CR.

  • Page 88: Removing The Motor Assembly, Pf

    REV.-A 3.2.5.4 Removing the MOTOR ASSEMBLY, PF Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover and tractor unit. [STEP 11 (See Section 3.2.1.) [STEP Remove the PANEL UNIT. (See Section 3.2.2.) the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) Remove [STEP 31 [STEP 41...

  • Page 89: 3,2.5.5 Disassembling The Gear Train, Pf

    REV.-A 3.2.5.5 Disassembling the GEAR TRAIN, PF [STEP 1] Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover and tractor unit. (See Section 3.2.1.) Remove the PANEL UNIT. (See Section 3.2.2.) [STEp 21 Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) [STEp 31 Remove the PRINTER MECHANISM.

  • Page 90: Removing The Carriage Guide Assembly

    REV.-A 3.2.5.6 Removing the CARRIAGE GUIDE ASSEMBLY Remove the PAPER GUIDE ASSEMBL’f, top cover, front cover, paper eject cover and tractor unit. [STEP (See Section 3.2.1.) Section Remove PANEL UNIT. (See 3.2.2.) [STEP 21 Remove the PRINTHEAD. (See Section 3.2.3.) [STEP 31 Remove the HOUSING ASSEMBLY, UPPER.
  • Page 91 REV.-A Assembly Note When attaching the TIMING BELT to the CARRIAGE ASSEMBLY, secure the TIMING BELT using the left and right clips of the CARRIAGE ASSEMBLY as shown below. Make sure there is no slack in the TIMING BELT. Clip TIMING BE Figure 3-16.

  • Page 92: Removing The Ribbon Drive (Rd) Assembly

    REV.-A 3.2.5.7 Removing the Ribbon Drive (RD) ASSEMBLY [STEP 11 Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover and tractor unit. (See Section 3.2.1.) Remove the PANEL UNIT. (See Section 3.2.2.) [STEP 21 Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) [STEP 31 Remove the PRINTER MECHANISM.

  • Page 93: Removing The Home Position (Hp) Detector

    REV.-A 3.2.5.8 Removing the Home Position (HP) DETECTOR .,.% ,> [STEP Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. (See Section 3.2.1.) Remove the clip of the DETECTOR, HP. Remove the detector. [STEp 21 Disconnect the LEAD, HP from the DETECTOR, HP.

  • Page 94: Removing The Front And

    REV.-A 3.2.5.10 Removing the Front and Rear Paper End (PE) DETECTORS PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. Remove the [STEP 11 (See Section 3.2.1.) Remove the PANEL UNIT. (SeeSection 3.2.2.) [STEP 2] Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) [STEP 3] Remove the PRINTER MECHANISM.

  • Page 95: Removing The Detector, Release

    REV.-A 3.2.5.11 Removing the DETECTOR, RELEASE Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. [STEP (See Section 3.2.1.) UNIT. (See Section 3.2.2.) [STEP 21 Remove the PANEL Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) [STEP 31 MECHANISM.

  • Page 96: Arranging The Cables

    REV.-A 3.2.5.12 Arranging the Cables When you assemble the printer, arrange the cables as shown in Figure 3-22. >—1 PRINTER MECHANISM (Bottom) figure 3-22. Arranging the Cables 3-21...

  • Page 97: Disassembling The Tractor Unit

    REV.-A 3.2.5.13 Disassembling the Tractor Unit Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. [STEP (See Section 3.2.1.) [STEP 21 Release the two clips of the cog (17) from the tractor shaft. Remove the co9. [STEP 31 Remove the right tractor frame from the tractor shaft and the tractor guide shaft.

  • Page 98: Removing The Board Assembly, C094 Main

    REV.-A 3.2.6 Removing the BOARD ASSEMBLY, C094 MAIN Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. [STEP 1] (See Section 3.2.1.) Remove the PANEL UNIT. (See Section 3.2.2.) [STEP 21 HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) Remove the [STEP 31 Remove the PRINTER MECHANISM.

  • Page 99: Removing The Board Assembly, C076 Psb/Pse

    REV.-A Removing the BOARD ASSEMBLY, C076 PSB/PSE 3.2.7 WARNING Do not touch the heat sink attached to the FET (Ql) when the printer is powered. If you touch the heat sink, you may suffer from electric shock. [STEP 1] Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover and tractor unit. (See Section 3.2.1.) [STEP 2] Remove the PANEL UNIT.

  • Page 100: List Of Figures

    REV.-A CHAPTER 4 ADJUSTMENTS 4.1 Adjusting the Printer Mechanism ..............4-1 4.1.1 Platen Gap Adjustment .

  • Page 101: Adjusting The Printer Mechanism

    REV.-A 4.1 Adjusting the Printer Mechanism This section describes the various adjustments required to keep the printer mechanism in optimum condition. 4.1.1 Platen Gap Adjustment If you rotated or reassembled the carriage guide shaft or the PARALLELISM ADJUSTMENT BUSHING, or if printing is abnormal, you must adjust the gap between the platen and the printhead.

  • Page 102: Bidirectional Alignment Adjustment

    REV.-A :,” .., LEVER, G, ADJUST Figure 4-1. PARALLEUSM ADJUSTMENT BUSHING 4.2 Bidirectional Alignment Adjustment This section describes how to adjust the bidirectional print position to ensure correct printing. 4.2.1 Overview of the Bidirectional Alignment Adjustment The FX-870/l 170 prints characters when the carriage moves from both left to right and right to left.

  • Page 103: Bidirectional Alignment Adjustment Prooedure

    REV.-A 4.2.2 Bidirectional Alignment Adjustment Procedure The FX-870/l 170 provides bidirectional alignment adjustment pro9ram. When load PaPer and run the program, the printer automatically feeds the paper and prints some patterns. You use the printout to adjust in the following steps. the printer’s bidirectional alignment as described Adjustment Operation while pressing the PAUSE, PAPER FEED, and FONT buttons...

  • Page 104: Troubleshooting

    REV.-A CHAPTER 5 TROUBLESHOOTING 5.1 Overview ......................5-1 5.2 Repair byUnitReplacement .

  • Page 105: Overview

    REV.-A 5.1 Overview The FX-870/l 170 may exhibit different symptoms for the same problem. This makes troubleshooting difficult. This section provides simple and effective ways to facilitate troubleshooting. The following flowchart illustrates the main steps of the troubleshooting process. START I 5.3 5-13 I 5-1o...
  • Page 106 REV.-A #2 o #3 o #4 o #5 o #6 O #7 o #8 O #9 o IWIRE ASSIGNMENT TEMP1 TEMPZ Coil Resistance : 16.5 * 1.6Q at 25°C (Bemeen each dot wire and common.) COM. COM. COM. [TERMINAL ASSIGN MENTI Note: COM.2 = #2, #4, #6 COM.8 = #7, #8, #9 COM.14 = #1, #3, #5...
  • Page 107 REV.-A Table 5-2. Error Indication Cause Error Error Warning An error has occurred with Buzzer beeps: *** *** the carriage position. RAM abnormality. Memory error. Buzzer beeps: ** ** ** ** PROM abnormality. Memory error. Buzzer beeps: ** ** ** ** ** Paper out error.

  • Page 108: Repair Byunitreplacement

    REV.-A (, . . . ? ? > 5.2 Repair by Unit Replacement Most problems can be corrected by replacing the defective unit. First, identifi the problem from the printer symptoms you observe using the table below. Then, follow the instructions in the corresponding flowchart to correct the problem.
  • Page 109 REV.-A Flowchart (1) abnormal operation at power on WARNING Do not touch the heat sink attached to the FET (Ql) when the printer is powered. If you touch the heat sink, you may suffer from electric shock. START Use the correct AC input voltage. Voltage range: 103.5-132 V (No fluctuation from the Voltage range: 198-264...
  • Page 110 REV.-A Flowchart (2) carriage operation abnormal START CN3, 4, 5, 6, 7, 8, 9, and 13 Secure the connectors. connecting the BOARD ASSY., C094 MAI and the printer mechanism problem corrected? coil resistance correct (5 ohms +/- 7 at room ‘%.
  • Page 111 REV.-A Flowhart (3) self test printing abnormal START & Set the platen gap adjust lever to O and perform the self test. (To start the self test, turn on the printer while holding down the PAPER FEED button.) Does the printer CN3, 4, 5, 6, 7,8,9, and 13 connecting the BOARD ASSY., C094 MAIN and the printer mechanism...
  • Page 112 REV.-A c“ Flowchart (4) paper feeding abnormal (==) Load the paper correctly. Insert connector CN6 correctly. coil resistance correct Replace the PF motor. (63 ohms +/- 3 at room Repair the BOARD ASSY., smoothly when the printer C094 MAIN. I Refer to Section 5.5, Repairing the Printer Mechanism.
  • Page 113 REV.-A operation abnormal Flowchati (5) control panel CN12 connecting the BOARD Insert connector ASSY., C094 PNL and the BOARD CN12 correctly. ASSY., C094 MAIN inserted Repair the BOARD ASSY., C094 MAIN. Replace the BOARD ASSY., C094 PNL. Replace the BOARD ASSY., C094 PNL.
  • Page 114 REV.-A Flowchart (6) incorrect printing of data sent from host computer Note: The host computer is assumed to be operating normally. START Perform the self test (Turn on the printer while holding down the PAPER FEED button). See Section 5.3 self test correctly? through 5.5.

  • Page 115: Repairingthe Board Assembly, C076Psb/Pse

    REV.-A Repairing the Board Assembly, C076 PSB/PSE C076 PSB/PSE. It describes various This section provides instructions for repairing the BOARD ASSEMBLY, The checkpoint column provides proper waveforms, problems, likely causes, checkpoints, and solutions. resistance values, and other information for each component of the C076 PSB/PSE. The OPERATE button on the control panel turns on or off only the secondary power circuit, so the primary power circuit long as the printer IS connected to an AC power outlet.
  • Page 116 Table 5-4. Repairing the BOARD ASSEMBLY, C076 PSB/PSE (Continued) Checkpoint Solution Problem Cause Replace The voltage of the Check the voltage waveforms at Q3. Q3, ICI, Pcl, PC2 D3, Icl, +35 V line is below Pcl, PC2 thespecifiedvalue. ZD51. CH1=O.2V TlME=2~s Replace Q2.
  • Page 117 REV.-A 5-4. Table Repairing the BOARD ASSEMBLY, C076 PSB/PSE (Continued) Checkpoint Problem Cause Solution {efer to tht ;heck the +35 V line. rhe +35 V line is rhe+5Vlineisdead. terns ~ead. iescribed ]bove. {eplace C51 is dead. :heck the oscillation waveform (IC51 pin 5) and the C51.

  • Page 118: Repairingthe Boardassembly, C094Main

    REV.-A f“ . + 5.4 Repairing the Board Assembly, C094 MAIN This section provides instructions for repairing the BOARD ASSEMBLY, C094 MAIN. It describes various problems, symptoms, likely causes, checkpoints, and solutions. The checkpoint column provides proper waveforms, resistance values, and other information for each component of the C094 MAIN. Table 5-5.
  • Page 119 REV.-A Table 5-5. Repairing the BOARD ASSEMBLY, C094 MAIN (Continued) Checkpoint Solution Symptom Cause Problem If the signal Check the oscillator signal (IC2CI pin 27 or pin The CPU is The CPU ~bnormal is not correct, 28). defective. )peration at does not replace operate )ower on.
  • Page 120 REV.-A Table 5-5. Repairing the BOARD ASSEMBLY, C094 MAIN (Continued) Checkpoint Symptom Cause Solution Problem Replace IC4. Check the head pulse signal at pin 31 (input) Self test The printer IC4 is and pin 63 (output). defective. printing does not print the self abnormal test.
  • Page 121 Table 5-5. Repairing the BOARD ASSEMBLY, C094 MAIN (Continued) Checkpoint Solution Cause Problem Symptom Replace ICI. ICI is Check the input signal (pin 2) and the output ~aper feed The printer does not defective. waveform (pin 3). abnormal. feed the paper at all (CH2:PIN 3) or the paper...

  • Page 122: Repairing The Printer Mechanism

    REV.-A Mechanism 5.5 Repairing the Printer ,~,. ..: for repairing the printer mechanism. It describes various problems, This section provides instructions symptoms, likely causes, checkpoints, and solutions. The checkpoint column shows the items to be checked, including the 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, Adjustment.
  • Page 123 REV.-A Table 5-6. Repairing the Printer Mechanism (Continued) Solution Checkpoint symptom Cause Problem C h e c k t h e c o m m o n Replace the FFC. The carriage common wires Self test printing moves, but the self- in the printhead FFC wires in the a b n o r m a l .
  • Page 124 REV.-A Table 5-6. Repairing the Printer Mechanism (Continued) Solution Problem symptom Cause Checkpoint The ribbon Replace the Ribbon feed The ribbon does Remove the ribbon abnormality. cartridge is ribbon cartridge. not feed. cartridge. Then defective. rotate the ribbon f e e d r o l l e r manually to check that the ribbon...
  • Page 125 REV.-A CHAPTER 6 MAINTENANCE Preventive Maintenance ................. 6-1 Lubrication .

  • Page 126: Preventive Maintenance

    Do not use thinner, tnchloroethylene, or ketone-based solvents on the plastic components of the 6.2 Lubrication EPSON recommends that the printer be lubricated at the points shown in Figure 6-2. Table 6-2 lists each lubrication point and its recommended lubricant. All the lubricants have been tested extensively and found to comply with the requirements of this printer.
  • Page 127 REV.-A Table 6-2. Lubrication Points Lubricant Ref. No. Lubrication Points Platen gap adjustment slots on the LE~ FRAME G-26 (excluding the two slots at the bottom) G-26 The arms and tab of the RD ASSEMBLY G-26 The shaft end of the ROLLER ASSEMBLY, DRIVE The ribbon drive gear train G-26 The OIL PAD in the CARRIAGE ASSEMBLY...
  • Page 128 REV.-A Figure 6-1. Lubrication Points...

  • Page 129: List Of Tables

    REV.-A APPENDIX A.1 Connector Summary ............A-l . . m..-.-...m..-...m..~..-A-5 A.2 Circuit Diagrams ........A.3 Circuit Board Component Layout .

  • Page 130: Printer Mechanism

    REV.-A A.1 Connector Summary Figure A-1 illustrates the interconnection of the primary components. Table A-1 summarizes the functions and sizes of the connectors. BOARD ASSEMBLY, C094 MAIN BOARD ASSEMBLY, C076 PSB/PSE — I D ETEC;”R’ P G1 IEF-1 DETECTOR, ‘E —...
  • Page 131 REV.-A . . , . , Table A-1. C094 MAIN Board Connector Summary f’ Board Function Pins Connector BOARD ASSEMBLY, Host Computer C094 MAIN Optional Interface DETECTOR, PE (Front) 2 (Blue) DETECTOR, RL 2 (White) DETECTOR, PG 2 (Black) MOTOR ASSEMBLY, PF DETECTOR, HP 2 (Yellow) PRINTHEAD...
  • Page 132 REV.-A See Table 1-14 for CNI (Centronics interface). Table A-3. CN3 (BOARD ASSEMBLY, C094 MAIN) Table A-2. CN2 (BOARD ASSEMBLY, C094 MAIN) Function No. 1/0 Signal Name Function No. 1/0 Signal Name Signal Ground +5 VDC Paper End, FRONT +5 VDC +5 VDC +5 VDC Table A-4.
  • Page 133 REV.-A Table A-n. CN13 (BOARD ASSEMBLY, C094 MAIN) ., Table A-8. CN8 (BOARD ASSEMBLY, C094 MAINI — No. 1/0 Signal Name Function Function — CR Motor Phase A CR A Head Data 2 CR Motor Phase ~ CR ~ Head Drive Common C246 CR Motor Phase B CR B...
  • Page 134 r’+ : > EN--l ‘=m -1 : ‘ I k ,, , _?.......:- Figure A-4, BOARD ASSEMBLY, C076 PSB Circuit Diagram (Annotated)
  • Page 138 EPSON...

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