EPSON EPSON TERMINAL PRINTER FX-870/1170 SERVICE MANUAL 4001461 REV.
.-. .. & {’”’ -.. , NOTICE “ All rights reserved. Reproduction of any part of this manual in any from whatsoever 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.
REV.-A PRECAUTIONS Precautionary notations throughout the text are categorized relative to 1 ) personal injury, and 2) damage to equipment: DANGER Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing procedures preceded by a DANGER headings. WARNING Signals a precaution which, if ignored, could result in damage to equipment.
REV.-A PREFACE This manual describes functions, theory of electrical and mechanical operations, maintenance, and repair of the FX-870/l 170. 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.
. ,. :;: \ f .. REVISION SHEET REVISON DATE ISSUED CHANGE DOCUMENT A June 15, 1992 1st issue * ‘?: (“ .
REV.-A TABLE OF CONTENTS CHAPTER 1. CHAPTER 2. CHAPTER 3. CHAPTER 4. CHAPTER 5.
REV.-A CHAPTER 1 GENERAL DESCRIPTION 1-1 1.1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 1.1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1 1.1.2 Options . . . . . . . .
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.
REV.-A LIST OF TABLES .. Table 1-1. Line Feed Speed (1 line= 1/6”) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 . Table 1-2. Specifications for Cut Sheets (plain paPer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6 Table 1-3. Specifications for Cut She*s (carbonless Dwli-tim paPer) ...”.s 1-7 . Table 1-4. Specifications for Continuous Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REV.-A 1.1 Scope These specifications apply to the EPSON FX-87WI 170 dot matrix Printer. 1.1.
. REV.-A 4% ~ .- r~.. ... “ 80-column model 136-column model Figure 1-1. External View of the FX-870/1170 . 1-2 ,.
REV.-A 1.1.2 Options C806372 (other) Plain cut sheet feeder ( 80-column) Plain cut sheet feeder ( 80-column) C806391 (U.S. version) Plain cut sheet feeder (136-column) C806392 (other) Plain cut sheet feeder (136-column) C806381 (U.S. version) Cut sheet feeder ( 80-column) C806382 (other) Cut sheet feeder ( 80-column) C806401 (U.S. version) Cut sheet feeder (136-column) C806402 (other) Cut sheet feeder (136-column) C800201 (U.S.
REV.-A 1.2 Specifications 1.2.1 Hardware Specifications 1.2.1.1 Printing Method Printing method: Impact dot matrix Pin configuration: 9 wires (diameter 0.29 mm) wire 2+--- - 3 ‘ 9 $ ------- 0.35mm (lf12”) 9& Figure 1-2. Pin Configuration Dot matrix: 9 x 7 matrix (high-speed draft) 9 x 9 matrix (draft) .=. 18x 23 matrix (NLQ) {....;’ 1.2.1.2 Paper Handling Feeding method: Friction feed (front/top) Push tractor feed (frontfrear) Pull tractor feed (front.
REV.-A Table 1-1. Line Feed Speed(1 iine = 1/6”) Continuous feed Intermittent feed * Thin: Thick: Thin Thick Thin Thick ms ms ms (ips) ms (ips) Fanfold paper 77 85 55 (3.0) 66 (2.5) Cut sheet (manual) 69 77 45 (3.7) 55 (3.0) Cut sheet (CSF) 71 77 48 (3.5) 55 (3.0) Type of paper Thickness is less than or equal to 0.18 mm. Thickness is more than 0.18 mm. ***** precautions for Handling Paper ***** 1 ) Friction feed ● Set the release lever to the FRICTION position.
REV.-A 3) Pull tractor feed ● Set the release lever to the PULL position. ● Load the paper from the front, rear, or bottom entrance. ● Release the friction feed mechanism. ● Remove the paper-tension unit and attach the pull tractor unit. (The front or bottom entrance is recommended for thick paper or labels.) ● Insert the paper from either front or bottom. Multi-part paper must be carbonless. ● Do not perform reverse feeds.
REV.-A - . . - . - .,. . . , nm . —— m, -— m—--i 1 ame 1-s. specmcawons lor uu~ mee~s [eamomess uupncamng raper] -A -,- - —A— ,-— ..L . -. R- --– A,.- — Width front insertion Length 182-257 mm (7.2-10.1”) 182-364 mm (7.2-14.3”) 80-column 136-column Up to 297 mm (1 1.7”) 80-column Up to 364 mm (14.3”) 136-column Carbonless duplicating paper Quality Thickness 0.12-0.22 mm (0.0047-0.
. REV.-A Table 1-6. Specifications for Labels Size C. “:% t. 2 1/2” X 15/16” 4“ X 15/16” 4“ X 17/16” Thickness 0.07-0.09 mm (0.0028-0.0031”) - base paper 0.16-0.19 mm (0.0063-0.0075”) - total Quality Plain paper 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. 4) Do not perform reverse feed at any time. (including by hand).
REV.-A 1.2.1.4 Printable Area 1) Cut sheets top insertion 148-257 mm (5.8-10.1”): 80 columns 148-420 mm (5.8-16.5”) : 136 columns front insertion 182-257 mm (7.2-10.1”): 80 columns 182-364 mm (7.2-14.3”): 136 columns > < ●1 < L *1 Printable Area 1. T“ I_ ~ ABCD WXYZ I ABCD WXYZ -1- Figure 1-3. Printable Area for Cut Sheets * 1 3.0 mm (0.1 2“) or more when the paper width is less than 364 mm (14.3”). 25 mm (0.9”) or more when (136-column) the paper width is 420 mm (16.5”). ( 80-column) 3.
REV.-A 2) Continuous paper < * 1 < A. Printable Area *1, > L \ i ABCD WXYZ t I_ 4-- ABCD WXYZ 4 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”). ( 80 columns) . .1 . 13 mm (0.51”) or more when the paper width is 101 mm to 377.8 mm (4” to 14.87”). 25 mm or more when the paper width is 381 mm to 406 mm (15” to 16”).
REV.-A 3) Roll paper (80-column model only) top insertion 216 +/- 3 mm (8.5 +/- 0.12”) 101-254 mm (4-10”): 80 columns 101-406 mm (4-16”): 136 columns k > +1 ●1 Printable Area + o 0 0 0 0 0 0 0 0 , 0 4o WXYZ 0 0 .--0. % u . WXYZ . . ABCD o 0 0 0 0 0 0 0 0 0 Figure 1-5. Printable Area for Roll Paper *1 3.0 mm (0.1 2“) or more Note: Paper feed accuracy cannot be assured within 24 mm (0.94”) from the bottom edge of the paper. (top insertion only) 1.2.1.
. REV.-A .c-.. . ., 1.2.1.6 Electrical Specifications See Table 1-8 and 1-9. Table 1-8. Electrical Specifications for 120V Model Rated voltage 120 VAC Input voltage range 103.5-132 V AC Rated frequency range 50-60 Hz Input frequency range 49.5-60.5 Hz Rated current 1.8 A Power consumption Approx. 45 W ( 80 columns) Approx. 45 W (136 columns) (Self test in draft mode, 10 cpi) 1.0 kVAC, 1 second Dielectric strength (Between AC line and chassis) Table 1-9.
REV.-A 1.2.1.8 Reliability 5 million lines (excluding a printhead) MCBF (MCBF: Mean Cycles Between Failures) MTBF (expected value) 4000 power on hours (duty cycle 25Yo) — 80-column model 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 (U.S.A model) UL1950 with D3 Safety standards CSA22.2#220 R.F.I EN 60950 (TUV) (EUR model) FCC class B (U.S.
. REV.-A f’:. .,’;: Table 1-11. Character Size and Pitch I Type of letters I Width I Height [mm] I I .,.- Character pitch [mm] [mm] 2.54 (10 cpi) Pica 2.1 3.1 Condensed 1.05 3.1 1.48 (17 cpi) Elite 1.7 3.1 2.11 (12 cpi) Condensed elite \ I 0.85 3.1 I 1.27 (20 cpi) Table 1-12.
REV.-A , 1.3 Interface This printer has a built-in, 8-bit centronics parallel interface. 1.3.1 Parallel Interface Data transmission mode Synchronization 8-bit parallel Controlled by external STROBE pulse. Handshaking Controlled by ACKNLG and BUSY signals. Logic level ITL- compatible Connector plug 57-30360 (Amphenol) or equivalent It is recommended that the interface cable be as short as possible (10 feet maximum). DATA :. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. REV.-A (Continued) Signal Signal Pin No. Return Pin No. 10 28 ACKNLG out Approx.12 us pulse. LOW indicates that data has been BUSY out A HIGH signal indicates that the printer cannot receive more Description Dir. Name e. .- . . , received and that the printer is ready to accept more data. 11 29 data. The signal becomes HIGH in the following cases: 1. During data entry 2. During input buffer full 3.
REV.-A , 1.3.2 Optional Interface The following interface cards can be used for this printer. Table 1-15.
. 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. [PAPER FEEDI Advances the paper line by line using the current line spacing setting while the printer is ready to print or paused by PAUSE button.
REV.-A Advances the paper forward by 1/108 inch per step. IFONTl+[pApER FEEDI 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. ● the current print position.
REV.-A 1.5 c .!. ,,. , Functions 1.5.1 Default Settings 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. 1. 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. 2. Press the FONT button to select a parameter.
REV.-A I ault$ I - Iu. -g uup m rcacul ca FONT COND. LED LED OFF ON OFF BLINKS ON OFF ON ON ON BLINKS BLINKS OFF BLINKS ON BLINKS BLINKS Setting Feature READY LED ESC/P Emulation OFF IBM Proprinter ON Pica OFF Elite ON 11 inch OFF 12 inch ON 8.
REV.-A Table 1 FONT I I LED 7. Group 2 Features (ESC/P Mode) COND. READY LED LED CG table U. S. A.(std. setting) Italic ON France BLINKS I OFF OFF I ON ON OFF ON Germany I U.K.
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 119, 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. Press the button indicated in Table 1-19 for a few seconds to change parameters. Table 1-19.
REV.-A 1.5.5 Self Test 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. ) When pages are printed from the CSF, the first sheet is used for scaling the sheet length. Then, the maximum number of printable lines is printed in the bottom line of the sheet and saved in non-volatile memory as the default page length.
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.
REV.-A Position 1 (3rd step) $\ \ .. -=. &’” r’ Platen Gap Adjust Lever 4.- Q 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). ● The READY LED lights.
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 * Carriage trouble Sounds when a BEL code has been input. *** *** An error has occurred with the carriage position. Voltage error No beeps. Fatal error (Shown by indicators blinking sequentially in the clockwise direction.
. REV.-A ..::,\ f’ 1.6 Main Components The components of the FX-870/l 170 are designed for easy removal and replacement during maintenance and repair. The main components are: (1) BOARD ASSEMBLY, C094 MAIN (2) BOARD ASSEMBLY, C094 PNL (3) BOARD ASSEMBLY, C076 PSB/PSE (4) Printer Mechanism (5) Housing Assembly The following figure shows the main components of the FX-870/l 170. Platen Ga PSB/PSE f-:: -.. ” y, C094 M AIN Pril 7 Figure 1-11.
REV.-A q.6.I BOARD ASSEMBLY, C094 MAIN (Main Control Circuit 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.
. REV.-A 1.6.2 BOARD ASSEMBLY, C094 PNL (Control Panel Circuit Board) 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.
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.
. 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 L Lower .-,. . {’:. :,;. Front Co Figure 1-16.
REV.-A CHAPTER 2 OPERATION PRINCIPLES 2-1 2.1 Printer Mechanism Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 2.1.1 Printhead Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-3 2.1.2 Carriage Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 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. Friction Advance Operation UsingtheTop Paper Entrance ...........2-6 Figure 2-5.
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. Each of these is described below. 2.1.
. REV.-A Figure 2-1 shows the action of the printer mechanism when a single dot is printed. c- -.- ., . “ Platen Ribbon Mask Dot Wire Wire Resetting Spring Stopper \ \ )b .ctuatlngT:-Rbf)cl Paper B$l=lieaclDrivingCOil Actuating Plate Spring Figure 2-1. How the Printhead Works The printhead tends to heat up after a period of continuous printing. To minimize the dot wire drive coil overheating, the head is equipped with a thermistor that can detect the head temperature.
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 in either direction along the carriage guide shaft. The carriage (CR)motor (a stepping motor) drives the timin9 belt which moves the carriage. The home position (HP) sensor detects the home position of the carriage. NOTE: Carriage initialization for the 80-coIumn and 136-column models are different.
. 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.
REV.-A I 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. Continuous paper is fed by a tractor.
. REV.-A 2.1.4.2 Paper Advance Mechanisms -,,>, > This section describes how the friction advance and tractor advance mechanisms work to advance the PaPer6 ... 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. The PF motor pinion gear, turning in the direction of the black arrow, drives the paper advance reduction gear.
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. When the PF motor pinion gear turns in the direction of the black arrow, thetractorgear rotates in the direction of the black arrow and thus feeds the paper into the printer.
REV.-A Paper (Continuous) & \ \ /RollerGe~~ t- \ Motor, PF Paper Advance Reduction Gear Drive Roller Gear / Push Tractor \ Push Tractor Gear Figure 2-6. Push Tractor Operation Using the Front Paper Entrance -.. f ., . ,.
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. As the result, the paper tension unit is not required. Figure 2-7 illustrates pull tractor operation when the paper is fed through the bottom paper entrance.
REV.-A A, c : .’ (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. Figure 2-8 illustrates push-pull tractor operation when the paper is fed through the rear paper entrance.
REV.-A Paper (Continuous) , Pull Tractor Paper Drive Roller \\ ,/ J 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.
REV.-A (5) Release Lever The release lever is used to select friction or tractor feeding or release the paper. When the release lever is o.;.- 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.
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. (1) Top entrance Figure 2-12 shows the paper path for friction feeding using the top entrance.
. 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. When the rear entrance is used, the rear PE detector senses when the paper is out. Paper (Continuous) Paper Tension Roller Push Tractor Detector, PE (Rear) Paper Guide Rollers Figure 2-13.
REV.-A Paper (Continu Printhead ctor ear) Paper Guide Rollers Figure 2-15. Paper Path for Push-pull Tractor FeedingUsing 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. When the bottom entrance is used, the front PE detector senses when the paper is out. Paper (Continuous) Paper Detector, PE (Front) \ Lower Paper Guide Roller Figure 2-16.
. REV.-A ~:>1 c -.. (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. When the front entrance is used, the front PE detector senses when the paper is out.
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.
. REV.-A 2.1.4 Ribbon Advance Mechanism i... c‘“” 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. The ribbon driving gear rotates counterclockwise no matter what direction the carriage moves, because the planetav gear is used in the gear linkage. Table 2-2.
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. Table 2-3.
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. The voltage is then fed through the switching circuit and the secondary smoothing circuit to produce a stepped down +35 VDC voltage.
REV.-A I I I I 1 Primary Secondary I 1 1 I 1 Full Wave Rectification Circuit — Smoothing Circuit Switching Circuit ; I I 1 1 . < Smoothing Circuit 4 + 3 5 VDC m I 1 1 I 1 1 1 9 l------ Filter Circuit 1 I 1 1 I I I I 1 I 1 1 I 1 1 t 1 I AC input +5 v Switching Regulator ................ +5V Over Current Control Circuit ----..-.....---+5V Over Voltage Control Circuit .
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). It oversees control of all the components of the printer.
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. CPU El- ---L -1 ~ Input buffer Print data conversion ~ Image buffer Image data transfer Figure 2-24.
. 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 TMP90C041F (2C1) Receives data from the host computer and loads it to the input buffer in RAM. Expands the input data held in the buffer to create image data. Loads the image data to the image buffer in RAM. Transfers the image data to the printhead drive circuit. Also controls various printer mechanism parts, such as the motors.
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.
. REV.-A 2.3.3 Sensor Circuits ( .>~ 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. The +35 V monitor circuit is used to set the pulse length of the head drive signal.
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. Table 2-5 describes the motor drive modes. The CR motor drive circuit of the SLA7024M (IC6) detects and regulates the amount of current flowing in the carriage motor coil.
. 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. PFA to PF-B are turned on or off within the uPA1476H (lCl) depending on the phase data sent from the CPU.
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. The pulse length is adjusted referring to the voltage of the +35 V line. These two types of signals are sent to the printhead to print each dot. Figure 2-29 shows the printhead drive circuit.
. REV.-A 2.3.8 E2PROM Control Circuit “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. E2 PROM ([C5C1) E05A66YA (IC4) CPU (IC2C1) Data Bus SCL SCK SDA SDA Figure 2-31.
REV.-A CHAPTER 3 DISASSEMBLY AND ASSEMBLY .. 3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 3-1 3.1.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3.1.2 TooIS . . . . . . . . . . . . . . .
REV.-A LIST OF FIGURES . -4 Figure 3-1. Flowchart for Disassembling the Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Figure 3-2. Removing the PAPER GUIDE ASSEMBLY .......................................3-5 Figure 3-3. Removing the PANEL UNIT ..............................................................3.6 . -6 Figure 3-4. Connecting the FFC Cable to the Panel Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 . Figure 3-5.
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 AC power outlet. Failure to do so may cause physical injury. The power switch is wired in the secondary circuitry.
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.
FHI.-A 3.1.4 Screw Specifications This chapter uses abbreviations for small parts, such as screws and washers. Tables 3-4 and 3-5 list these abbreviations. Table 3-4. Abbreviations Used for Screws Part Name Abbreviation CBB Cross-recessed Bind head B tight screw CBC Cross-recessed Bind head C tight screw CBN Cross-recessed Bind head N tight screw Cross-recessed Bind head S tiaht screw CBS Table 3-5. Screw Types and Abbreviations Head Body Top Washer (assembled) Side 1.~ross–recessed head 1.
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.
REV.-A 3.2.1 Pre-disassembly Procedures [STEP 11 Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. LY 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. When remounting them, be sure to snap these hooks on the projecting parts.
REV.-A 3.2.2 Removing the PANEL UNIT [STEP 11 .3 [ 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). PAN + ‘.m. - Figure 3-3. Removing the PANEL UNIT Assembly Note The FFC cable must be connected properly, as shown below.
REV.-A 3.2.3 Removing the PRINTHEAD [STEP 1] Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. [STEP 21 (See Section 3.2.1.) Remove the two CBS (M3X8) screws and the FFC cable from the PRINTHEAD. [STEP 31 Remove the PRINTHEAD. Figure 3-5.
REV.-A 3.2.4 Removing the HOUSING ASSEMBLY, UPPER “.:?. f [STEP 11 Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover and tractor unit. [STEP 21 (See Section 3.2.1.) Remove the PANEL UNIT. (See Section 3.2.2.) [STEp 31 Remove the three CBC (M4X15) screws securing the HOUSING ASSEMBLY, UppER. (There are only two screws in the 80-column printer.) [STEP 41 Push the two hooks through the cutouts located on the front cover to disengage the hooks from the plates.
REV.-A 3.2.5 Removing the PRINTER MECHANISM [STEP 11 Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover and tractor unit. (See Section 3.2.1.) [STEP 21 [STEP 31 [STEP 41 [STEP 51 [STEP 61 Remove the PANEL UNIT. (See Section 3.2.2.) Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) Remove the four CBB (M4X12) screws securing the PRINTER MECHANISM. Remove the CBS (M3X6) screw securing the INTERFACE COVER.
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. [STEP 21 (See Section 3.2.1.) Remove the PANEL UNIT. (See Section 3.2.2.) - [STEP 31 [STEP 4] Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) Remove the two CBS (M3X8) screws securing the COVER, PLATEN. [STEP 51 Disengage the teeth of the PLATEN SHAFT HOLDERS and rotate them. [STEP 61 [STEP 7] Remove the PLATEN KNOB.
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. [STEP 2] (See Section 3.2.1.) Remove the PANEL UNIT. (See Section 3.2.2.) [STEP 31 [STEP 41 Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) [STEp 51 Remove the PLATEN ASSEMBLY. (See Section 3.2.5.1.) [STEp 61 Remove the four CBS (M3X8) screvvs securing the LEFT FRAME of the pRINTER MECHANISM~ Remove the PRINTER MECHANISM. (See Section 3.2.
REV.-A 3.2.5.3 Removing the MOTOR ASSEMBLY, CR [STEP 11 ..,., , r Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. ‘ [STEP 2] (See Section 3.2.1.) Remove the PANEL UNIT. (See Section 3.2.2.) [STEP 3] Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) [STEP 41 Remove the face screw (M3X7) securing the MOTOR ASSEMBLY, CR. After releasing the tension [STEp 51 spring, disengage the TIMING BELT from the MOTOR ASSEMBLY, CR and hang it on the hook.
REV.-A 3.2.5.4 Removing the MOTOR ASSEMBLY, PF [STEP 11 Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover and tractor unit. [STEP 21 (See Section 3.2.1.) Remove the PANEL UNIT. (See Section 3.2.2.) [STEP 31 [STEP 41 [STEP 51 [STEP 61 [STEP 71 Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) Remove the PRINTER MECHANISM. (See Section 3.2.5.) Set the LEVER, RELEASE to the vertical or forward position.
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. [STEp 21 (See Section 3.2.1.) Remove the PANEL UNIT. (See Section 3.2.2.) [STEp 31 Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) [STEP 41 Remove the PRINTER MECHANISM. (See Section 3.2.5.) [STEP 51 Remove the MOTOR ASSEMBLY, CR. (See Section 3.2.5.3.) [STEP 61 Remove the MOTOR ASSEMBLY, PF. (See Section 3.2.5.4.
REV.-A 3.2.5.6 Removing the CARRIAGE GUIDE ASSEMBLY [STEP 11 [STEP 21 [STEP 31 [STEP 41 [STEP 51 [STEP 61 [STEP 71 [STEP 81 [STEP 91 [STEp 101 Remove the PAPER GUIDE ASSEMBL’f, top cover, front cover, paper eject cover and tractor unit. (See Section 3.2.1.) Remove the PANEL UNIT. (See Section 3.2.2.) Remove the PRINTHEAD. (See Section 3.2.3.) Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) Remove the PRINTER MECHANISM. (See Section 3.2.5.) Remove the PLATEN ASSEMBLY. (See Section 3.2.
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. Attaching the TIMING BELT .,.
REV.-A 3.2.5.7 Removing the Ribbon Drive (RD) ASSEMBLY [STEP 11 [STEP 21 [STEP 31 [STEP 41 [STEP 51 [STEP 61 [STEP 71 [STEP 81 [STEP 91 [STEP 101 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.) Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) Remove the PRINTER MECHANISM. (See Section 3.2.5.) Remove the PLATEN ASSEMBLY. (See Section 3.2.5.1.) Remove the LEIT FRAME of the PRINTER MECHANISM.
REV.-A 3.2.5.8 Removing the Home Position (HP) DETECTOR [STEP 11 Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. [STEp 21 (See Section 3.2.1.) Remove the clip of the DETECTOR, HP. Remove the detector. [STEp 31 Disconnect the LEAD, HP from the DETECTOR, HP. .,.%,> c i!- Figure 3-18. Removing the DETECTOR, HP 3.2.5.
REV.-A 3.2.5.10 Removing the Front and Rear Paper End (PE) DETECTORS [STEP 11 Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. [STEp 51 (See Section 3.2.1.) Remove the PANEL UNIT. (SeeSection 3.2.2.) Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) Remove the PRINTER MECHANISM. (See Section 3.2.5.) I Remove the PLATEN ASSEMBLY. (See Section 3.2.5.1.) [STEP 61 Remove the FRAME ASSEMBLY, REAR. (See Section 3.2.5.2.
REV.-A 3.2.5.11 Removing the DETECTOR, RELEASE [STEP 11 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.) [STEP 31 [STEP 41 Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) [STEp 51 [STEP 6] Remove the PLATEN ASSEMBLY. (See Section 3.2.5.1.) [STEp 71 Remove the two clips of the DETECTOR, RELEASE mounted on the PAPER GUIDE ASSEMBLY, Remove the PRINTER MECHANISM.
REV.-A 3.2.5.12 Arranging the Cables When you assemble the printer, arrange the cables as shown in Figure 3-22. >—1 n n hl n 7/d o w PRINTER MECHANISM (Bottom) b figure 3-22.
REV.-A 3.2.5.13 Disassembling the Tractor Unit f? [STEP 11 Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. [STEP 21 (See Section 3.2.1.) 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. [STEP 41 Remove the E-ring from the tractor shaft.
REV.-A 3.2.6 Removing the BOARD ASSEMBLY, C094 MAIN [STEP 1] Remove the PAPER GUIDE ASSEMBLY, top cover, front cover, paper eject cover, and tractor unit. [STEP 21 (See Section 3.2.1.) Remove the PANEL UNIT. (See Section 3.2.2.) [STEP 31 Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4.) [STEP 41 Remove the PRINTER MECHANISM. (See Section 3.2.5.) [STEp 51 [STEP 61 Disconnect the cable from connector CN2 on the BOARD ASSEMBLY, C076 PSB/pSE.
REV.-A 3.2.7 Removing the BOARD ASSEMBLY, C076 PSB/PSE :.+ [ 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. [STEP 2] (See Section 3.2.1.) Remove the PANEL UNIT. (See Section 3.2.2.) [STEP 3] Remove the HOUSING ASSEMBLY, UPPER. (See Section 3.2.4) [STEP 4] Remove the PRINTER MECHANISM.
REV.-A CHAPTER 4 ADJUSTMENTS . 4.1 Adjusting the Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 4-1 4.1.1 Platen Gap Adjustment .. 4.2 Bidirectional Alignment Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. [STEP 11 [STEp 21 Remove the printer’s top cover. Move the LEVER, G. ADJUST to the O setting. [STEP 31 Remove the RIBBON MASK using tweezers.
REV.-A :,” . . . . . ., f 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. Therefore, the printing in one direction must be correctly aligned with the printing in the other direction.
REV.-A 4.2.2 Bidirectional Alignment Adjustment Procedure The FX-870/l 170 provides bidirectional alignment adjustment pro9ram. When YOU load PaPer and run the program, the printer automatically feeds the paper and prints some patterns. You use the printout to adjust the printer’s bidirectional alignment as described in the following steps. Adjustment Operation [STEP 1] Turn on the printer’s power while pressing the PAUSE, PAPER FEED, and FONT buttons simultaneously.
REV.-A CHAPTER 5 TROUBLESHOOTING 5.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......5-1 . 5.2 Repair byUnitReplacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4 5.3 Repairingthe Board Assembly, C076PSB/PSE . . . . . . . . . . . . . .
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. T START 1 r I 5.3 I 5-1o I 5.4 I 15-10 5.5 5-13 ~ The problem is corrected. ] Figure 5-1. The Troubleshooting Procedure The following tables provide troubleshooting information. Table 5-1.
REV.-A #1 o #2 o #3 o #4 o #5 o #6 O #7 o #8 O #9 o IWIRE ASSIGNMENT #2 #6 #4 TEMP1 TEMPZ #3 #7 Coil Resistance : 16.5 * 1.6Q at 25°C (Bemeen each dot wire and common.) COM. #8 #9 COM. #1 #5 COM. [TERMINAL ASSIGN MENTI Note: COM.2 = #2, #4, #6 COM.8 = #7, #8, #9 COM.14 = #1, #3, #5 Figure 5-2. Printhead Resistance .. . t - -‘ j. ...
REV.-A Table 5-2. Error Indication Error Warning Buzzer beeps: *** *** Cause Error An error has occurred with the carriage position. Buzzer beeps: ** ** ** ** Memory error. RAM abnormality. Buzzer beeps: ** ** ** ** ** Memory error. E2PROM abnormality. Buzzer beeps: **** **** **** **** **** Paper out error. ● Continuous paper has run out. ● There is no cut sheet paper in the CSF. ● No paper was present at the start of a self test. Buzzer beeps: Paper out error.
REV.-A (,.? > 5.2 Repair by Unit Replacement Most printer problems can be corrected by replacing the defective unit. First, identifi the problem from the symptoms you observe using the table below. Then, follow the instructions in the corresponding flowchart to correct the problem. Table 5-3. Symptoms and Flowchart References Problem Symptom Abnormal operation at ● The carriage does not move. power on ● The indicator LEDs on the control panel do not light.
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. (No fluctuation from the recommended AC voltage range is permitted.) Voltage range: 103.5-132 V Voltage range: 198-264 Replace the fuse and disconnect CN14 on the BOARD ASSY., No No v Measure the VP (+35 VDC) at pin 10, CN2 of the BOARD ASSY., C076 PSB/PSE.
REV.-A Flowchart (2) carriage operation abnormal START CN3, 4, 5, 6, 7, 8, 9, and 13 connecting the BOARD ASSY., C094 MAI and the printer mechanism Secure the connectors. problem corrected? Yes coil resistance correct (5 ohms +/- 7 ‘%. at room problem corrected? v Replace the BOARD ASSY,, C094 MAIN. v Refer to Section 5.5, Repairing the Printer Mechanism. END END * * Note: If any coils in the CR motor are shorted, also test the motor drivers on the BOARD ASSY., C094 MAIN.
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.) I Does the printer CN3, 4, 5, 6, 7,8,9, and 13 connecting the BOARD ASSY., C094 MAIN and the printer mechanism Perform the bidirectional I , Yes Adjust the platen gap. properly inserted? *, No 5-7 Replace the BOARD ASSY,, C094 MAIN.
REV.-A c“ Flowchart (4) paper feeding abnormal (==) Load the paper correctly. Insert connector CN6 correctly. coil resistance correct (63 ohms +/- 3 at room Replace the PF motor. v END Repair the BOARD ASSY., C094 MAIN. I smoothly when the printer Yes No [ I Refer to Section 5.5, Repairing the Printer Mechanism. v END END * Note: If any coils in the PF motor are shorted, also test the motor drivers on the BOARD ASSY., C094 MAIN.
REV.-A Flowchati (5) control panel operation abnormal CN12 connecting the BOARD ASSY., C094 PNL and the BOARD ASSY., C094 MAIN inserted Insert connector CN12 correctly. I No A Q Yes END Repair the BOARD ASSY., C094 MAIN. Replace the BOARD ASSY., C094 PNL. Replace the BOARD ASSY., C094 PNL. I ‘Yes -%zm-l H Repair the ASSY., CO& z.,-.,..
REV.-A Flowchart (6) incorrect printing of data sent from host computer Note: The host computer is assumed to be operating normally. START 1 Perform the self test (Turn on the printer while holding down the PAPER FEED button). See Section 5.3 through 5.5. self test correctly? 4-, G Check the printer’s default settings. See Section 1.5.1 for information on Yes 1s the problem corrected? No Replace the interface cable that connects the printer to the host computer.
REV.-A 5.3 Repairing the Board Assembly, C076 PSB/PSE This section provides instructions for repairing the BOARD ASSEMBLY, C076 PSB/PSE. It describes various The checkpoint column provides proper waveforms, resistance values, and other information for each component of the C076 PSB/PSE. problems, likely causes, checkpoints, and solutions.
Table 5-4. Repairing the BOARD ASSEMBLY, C076 PSB/PSE (Continued) Problem The voltage of the Checkpoint Cause Q3, ICI, Pcl, PC2 Solution Replace Check the voltage waveforms at Q3. +35 V line is below D3, Icl, thespecifiedvalue. Pcl, PC2 or ZD51. . TlME=2~s CH1=O.2V Q2 is dead. , Replace Q2. Check the voltage waveforms at Q2. I CH1=2V 1 1 I HI 1 I ....
REV.-A Table 5-4. Repairing the BOARD ASSEMBLY, C076 PSB/PSE (Continued) Problem rhe+5Vlineisdead. Checkpoint Cause rhe +35 V line is Solution {efer to tht ;heck the +35 V line. terns ~ead. iescribed ]bove. C51 is dead. :heck the oscillation waveform (IC51 pin 5) and the I I I 1 + I II I I I I I I 1 1 Ill II II I I I I 1 I I TlME=20ps CH1=2V CH2=20V 251 or Q52 is C51. 8). switching waveform (IC51 pin {eplace Check the switching waveform at Q52 emitter. Replace D51 or iead.
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.
REV.-A Table 5-5. Repairing the BOARD ASSEMBLY, C094 MAIN (Continued) Problem ~bnormal Symptom The CPU )peration at does not operate )ower on. Checkpoint Cause Solution The CPU is Check the oscillator signal (IC2CI pin 27 or pin defective. 28). If the signal is not correct, replace IC2CI . properly. Otherwise, replace CR1. TIME=O.lVS 1 [ CHI=2V 1 1 ;arriage The carriage operation does not ~bnormal. operate at IC6 is defective.
REV.-A Table 5-5. Repairing the BOARD ASSEMBLY, C094 MAIN (Continued) Problem Symptom Checkpoint Cause Solution Self test The printer IC4 is Check the head pulse signal at pin 31 (input) printing does not defective. and pin 63 (output). abnormal print the self Replace IC4. test. I (CH2:P IN 31) ~~ i .
Table 5-5. Repairing the BOARD ASSEMBLY, C094 MAIN (Continued) Problem Symptom ~aper feed The printer abnormal. does not Checkpoint Solution ICI is Check the input signal (pin 2) and the output Replace ICI. defective. waveform (pin 3). Cause feed the I paper at all (CH2:PIN 3) or the paper E feed is k irregular.
REV.-A 5.5 Repairing the Printer Mechanism ,~,...: q This section provides instructions for repairing the printer mechanism. It describes various problems, 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.
REV.-A Table 5-6. Repairing the Printer Mechanism (Continued) Problem Self test printing abnormal. symptom The carriage Cause The common wires moves, but the self- in the printhead FFC Checkpoint Check the common Solution Replace the FFC. wires in the test printing is not are disconnected, or printhead FFC. executed. there is no continuity. The printer does The printhead is Measure the coil Replace the not print a defective. resistance of the printhead. (If any printhead.
REV.-A Table 5-6. Repairing the Printer Mechanism (Continued) Problem Cause symptom Checkpoint Solution Ribbon feed The ribbon does The ribbon Remove the ribbon Replace the abnormality. not feed. cartridge is cartridge. Then ribbon cartridge. defective. rotate the ribbon feed roller manually to check that the ribbon cartridge feeds the ribbon normally. Foreign substances Check that the Remove any foreigl are caught in the ribbon driving gear substances or gears.
REV.-A CHAPTER 6 MAINTENANCE .. 6.1 Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6-1 6.2 Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LIST OF FIGURES .. Figure 6-1. Lubrication Points . . . . . . .
REV.-A 6.1 Preventive Maintenance Preventive maintenance involves occasionally vacuuming the printer mechanism to remove dust and paper debris and regularly cleaning the case exterior with denatured alcohol. After cleaning the unit, check that it is properly lubricated as described in Section 6.2, below. Also inspect the springs and rollers to see that they are operating properly. rcAunON Disconnect the printer from the external AC power source before performing maintenance work.
REV.-A Table 6-2. Lubrication Points . Ref. No. Lubrication Points Lubricant 1 Platen gap adjustment slots on the LE~ FRAME G-26 2 (excluding the two slots at the bottom) The arms and tab of the RD ASSEMBLY G-26 3 The shaft end of the ROLLER ASSEMBLY, DRIVE G-26 4 The ribbon drive gear train G-26 5 The OIL PAD in the CARRIAGE ASSEMBLY o-2 6 The cam surface of the CAM, CLUTCH, TRACTOR G-26 7 The cam end of the SPUR GEAR, 34.5 G-26 . .4, . ... ,. f. . ,: c.
REV.-A Figure 6-1.
REV.-A APPENDIX A.1 Connector Summary . . . .. . . . . . . . . . . . . . . . . . . . . . . . ............................A-l A.2 Circuit Diagrams . . . . . . . . . ... . . . . . . . . . . . . . . . . . . . . . . . . . ..m..-.-...m..-...m..~..-A-5 .. A.3 Circuit Board Component Layout . . . . . . . . . . . . . . . . . .............................A-12 .. A.4 Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. I I BOARD ASSEMBLY, C094 MAIN CN1 I BOARD ASSEMBLY, C076 PSB/PSE — I IDETEC;”R’PG1 IEF-1 I I I I — DETECTOR, ‘E (Front) 1 ~ PRINTHEAD 1 & PRINTER MECHANISM BOARD ASSEMBLY, C094 PNL Figure A-1.
REV.-A ,. . . f’ Table A-1. C094 MAIN Board Connector Summary Board Connector Function Pins BOARD ASSEMBLY, CN1 Host Computer 36 C094 MAIN CN2 36 CN3 Optional Interface DETECTOR, PE (Front) CN4 DETECTOR, RL 2 (White) CN5 DETECTOR, PG 2 (Black) CN6 MOTOR ASSEMBLY, PF 6 2 (Blue) CN7 DETECTOR, HP 2 (Yellow) CN8 PRINTHEAD 14 CN9 DETECTOR, PE (Rear) 3 CN12 BOARD ASSEMBLY, C094 PNL 10 CN13 MOTOR ASSEMBLY, CR CN14 BOARD ASSEMBLY, C076 PSB/PSE 5 11 .i’ L /.:. E.’ ...
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) No. 1/0 Signal Name Function +5 VDC 1 - GND Signal Ground +5 VDC 2 I PEF Paper End, FRONT No. 1/0 Signal Name Function 1 +5 - 2 - +5 3 - +5 +5 VDC 4 - +5 +5 VDC 5 - +5 +5 VDC 6 - +5 +5 VDC 7 0 TXD Transmit Data 8 9 0 I READY RXD Ready to Receive Data Table A-4. CN4 (BOARD ASSEMBLY, C094 MAIN) No.
REV.-A Table A-n. CN13 (BOARD ASSEMBLY, C094 MAIN) ., Table A-8. CN8 (BOARD ASSEMBLY, C094 MAINI — No — f Function No.
4 d r’+ . :> J m u) / EN--l I \ / , t I ‘=m C2 .0 c. O-* -1 : I m I I ‘ I k ,,, I * 1 _?... . . . . . . . . . . . . . . . . . . . . . . . . . ...
EPSON