Epson SQ-1170 Service Manual
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Epson SQ-1170 Service Manual

Epson SQ-1170 Service Manual

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EPSON TERMINAL PRINTER
SQ - 870/1170
4 0 0 1 2 2 5
REV.-A

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Summary of Contents for Epson SQ-1170

  • Page 1 EPSON TERMINAL PRINTER SQ - 870/1170 4 0 0 1 2 2 5 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 1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN. 2. MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE.
  • Page 4 C h a p t e r 4 - Includes a step-by-step guide for adjustment. Provides Epson-approved techniques for troubleshooting. C h a p t e r 5 - C h a p t e r 6 - Describes preventive maintenance techniques.
  • Page 5 REVISION SHEET REVISON DATE ISSUED CHANGE DOCUMENT 1st issue Feb. 21, 1992 e , : . ; - . , . . , , .
  • Page 6 REV.-A TABLE OF CONTENTS CHAPTER 1. GENERAL DESCRIPTION CHAPTER 2. OPERATING PRINCIPLES CHAPTER 3. D I S A S S E M B L Y A N D A S S E M B L Y CHAPTER 4. A D J U S T M E N T S CHAPTER 5.

  • Page 7: Table Of Contents

    CHAPTER 1 GENERAL DESCRIPTION FEATURES ....................1-1 SPECIFICATIONS .
  • Page 8 REV.-A LIST OF FIGURES Exterior View of the SQ-1 170 ..........1-2 Figure 1-1.

  • Page 9: Features

    Two ways to insert cut sheets (front/top) Auto loading The SQ-870/l 170 is equipped with the standard EPSON 8-bit parallel interface and various interface options ensure compatibility with a wide variety of computers. Table 1-1 lists the interface options, Table...

  • Page 10: Optional Units

    REV.-A Table 1-2. Optional Units Descriptions Model I C80647 / Single-bin cut-sheet feeder (80 columns] C80648 Single-bin cut-sheet feeder (136 columns) C80637 Second bin hopper (80 columns) IC80640 I S e c o n d binhopper(136 c o l u m n s ) C80023 Tractor unit (80 columns) C80024...

  • Page 11: Specifications

    REV.-A 1.2 SPECIFICATIONS This section provides specifications for the SQ-870/l 170 printer. Hardware Specifications 1.2.1 Printing method On-demand type ink jet system Nozzle configuration 48 nozzles (48 X 1 diagonal) ‘ ‘o ‘g (7.125°) 1/45” 47/45” Figure 1-2. Nozzle Configuration Feeding methods Friction feed (front/top) Push tractor feed (front/rear)

  • Page 12: Specifications For Cut Sheets

    REV.-A Push-pull tractor feed (release lever in REAR PUSH POSITION or FRONT PUSH POSITION). The paper must be loaded from the front or rear entrance. Release the friction-feed mechanism. Attach the pull tractor unit. O Ensure that there is no slack in the paper between the platen and the pull tractor. Precisely adjust the horizontal position of the pull tractor and push tractor.

  • Page 13: Figure 14. Label Size

    REV.-A Table 1-5. EnveIo~es Size No. 6 166 mm X 92 mm (6.5 in. X 3.625 in.) No. 10240 mm X mm (9.5 in. X 4.125 in.) Thickness 0.16 mm to 0.52 mm (0.0063 in. to 0.0197 in.) Differences in thickness within the printing area must be less than 0.25 mm (0.0098 in.) Weight 12 lb to 24 lb (45 g/m2 to 91 g/m2)

  • Page 14: Figure 1-5. Printable Area For Cut Sheets

    REV.-A See figures 1-5 and 1-6 Printable area 182-257mm ~.2-10.lind?) : 60cdm 13.5rnm (0.53-inti) or more 1: 80 columns: 3.0 mm (0.12 in.) or more when the width of paper is less than 229 mm (9 in.). ~~• more mm (0.51 in.) or when the width of paper is 257 mm (10.1 in.).
  • Page 15 REV.-A Type: Ink cartridge Exclusive ink cartridge Color: Black 105 to 115 cc Ink capacity: Print capacity (depending on the cleaning operation): Draft: 6 million characters Letter Quality: 3 million characters Ink life: 2 years from production date Storage temperature: –30 to 40 degrees C (–22 to 104 degrees F) -Storage (within a month at 40 degrees C (104 degrees F)) –30 to 60 degrees C (–22 to 140 degrees F) -Transit...

  • Page 16: Printer Operating Environment

    REV.-A 1 0 0 0 VAC rms 1 minute or 1200 Dielectric strength VAC rms 1 second (between line and chassis) 220 to 240 VAC Rated voltage 2 2 0 / 2 4 0 198 to 264 VAC Input voltage range version Rated frequency range 50 to 60 Hz...
  • Page 17 REV.-A 1.2.2 Firmware Specifications ES C/PTM level 2 (EPSON standard code for printers) Control code Printing direction Bi-directional with logic seeking (text printing) Uni-directional (bit-image printing) 16KB (Standard) Input data buffer 128KB (factory option) Character code 8 bits Character tables...

  • Page 18: Character Matrix

    REV.-A Printing speed See Tables 1-8 and 1-9. Printing columns See Table 1-8. Character matrix See Table 1-10. Character size See Table 1-10. Table 1-8. Printing (Text Mode) Printable Charactar Printing Speed Print Con- Empha- Double Pitch (Cps) Columns Pitch densed sized width...
  • Page 19 REV.-A Table 1-9. Printing (Bit Image Mode) Printing Adjacent 256 X n2 + nl Density Speed Pins 80 Columns 136 Columns (IPS) (DPI) Printing 1632 1632 3264 1920 1088 1224 1632 1224 1440 2448 4896 2880 1440 2448 4896 2880 2880 4896 DPI:...
  • Page 20 REV.-A Table 1-10. Character Matrix and Character Size Printing Mode Face Matrix Character Size Unit ESC sp ; Draft, 10 pitch 15 x 44 2.1 x 3.1 Draft, 12 pitch 3 . 1 13 x 44 1.6 X 2.3 Draft, pitch 11 X 32 Draft, 17 pitch...

  • Page 21: Figure 1-8. Character Matrix

    REV.-A (Normal character) (Sub-script character) From dot No. 1 to 16 are not Ascender area I while subscri~t txinting. — (a2) (aO) Descender area (Super-script character) From dot No. 33 to 48 are not used while superscript printing. — Character width (CW) Figure 1-8.

  • Page 22: Interface Overview

    REV.-A 1.3 INTERFACE OVERVIEW The printer has a parallel interface with the specifications described below. Parallel Interface 1.3.1 Specifications for the 8-bit parallel interface are as follows: 8-bit parallel Data format Synchronization STROBE signal Handshaking BUSY and ACKNLG signal Signal level ITL-compatible Adaptable connector...
  • Page 23 Table 1-11. Connector Pin Assignments and Signal Functions (Cont.) Return Dir. Functional Description Signal Name Pin No. AUTOFEED-XT If LOW when the printer is initialized, the printer line automatically performs a feed upon input of the CR code (Auto LF). Not used.

  • Page 24: Control Panel

    REV.-A CONTROL PANEL On the control panel are: 10 non-lock type buttons, and 24 indicators. —— I 0 111— Lom I -!. Figure 1-10. Control Panel BUTTONS (1) PAUSE Button This button controls printer action. Pressing the button toggles the printer between PAUSE condition (no printing, no paper feeding, or no data acception) and RUNNING.
  • Page 25 REV.-A (8) PITCH Button Pushing this switch once selects the character pitch. And holding this button down selects the following ones in sequence. PITCH indicators indicate the currently selected character pitch. RESET Button Holding this button down more than 0.45 second, the input data buffer is cleared and the printer initialized by software as ESC Cl?.

  • Page 26: Dip Switches And Jumper Setting

    REV.-A 1.5 DIP SWITCHES AND JUMPER SETTING This section describes the DIP switch selections and jumper setting for the SQ-870/l 170 printer. 1.5.1 DIP Switch Settings used to set various print The two DIP switch banks for the printer, located on the control panel, are conditions as shown in tables 1-12 through 1-15.

  • Page 27: Jumper Setting

    REV.-A Table 1-14. international Character Set Selection Country France Germany U.K. Denmark 1 Sweden (437) Italy (437) (437) Spain 1 When SW 1-4 is ON, italic table was selected by ESC t O, country setting becomes U.S. When SW 1-4 is OFF, if graphic table was selected by ESC t 1, PC becomes 437.

  • Page 28: Operating Instructions

    REV.-A 1.6 OPERATING INSTRUCTIONS This section describes the self-test and hexadecimal dump functions as well as the error states, printer initialization, and buzzer operation. 1.6.1 Self-Test To run the self-test using draft mode, turn the printer on while pressing the LINE FEED button. To run the self-test using the letter quality (LO) mode, turn the printer on while pressing the FORM FEED button.

  • Page 29: Buzzer Operation

    REV.-A Cover open The printer lid is opened. Fatal errors In the following cases, the printer recognizes them as fatal errors and enters the fatal error mode. The fatal error condition cannot be recovered until turning the power off. Carriage does not move correctly Control circuit cannot work correctly When the error condition is detected, the printer automatically enters ‘PAUSE’...

  • Page 30: Default Values

    REV.-A (2) Software initialization Input of the ESC C2 command also initialize the printer. Printer initialization by ESC C? code does not perform functions (d) or(e) above. The settings changed by the last SelecType operation are maintained. Panel initialization This printer can be initialized by pressing the RESET button on the front panel. When the printer is initialized in this method, the functions (b), (d) and (e) above are not performed.

  • Page 31: Tear-Off Function

    REV.-A When the paper is at the top-of-form position, the loading position is adjustable by using the ‘MICRO FEED’ function. In the ‘MICRO FEED’ function, pushing the LINE FEED button pushes the paper forward, and pushing the FORM FEED button pulls the paper backward. The adjusted loading position is stored into the memory and remains to be effective until the power is turned off.

  • Page 32: Printhead Protection

    REV.-A Printhead Protection 1.6.11 To keep the print quality, several kinds of printhead cleaning functions are performed automatically. (1) Power on cleaning Performed at power on when ‘(4) Cleaning’ as defined below is not required. It takes about several seconds. (2) Capping In the following cases the printhead is capped.

  • Page 33: Main Components

    REV.-A 1.7 MAIN COMPONENTS The main components of the SQ-870/l 170 printer are designed for easy removal and replacement to facilitate maintenance and repair of the printer. The main components are: C076 MAIN board: the main control board; the CPU on this board controls all main functions. Control panel unit C076 PSB/PSE board:...

  • Page 34: Figure 1-13. C076 Main Board

    REV.-A Board) 1.7.1 C076 MAIN Board (Main Control Circuit and contains a logic circuit and printer The C076 MAIN board is the main board in the printer, mechanism driver circuit. following memories and gate arrays are assigned in the The KPD70325 (location: IC5) is used, and the 1 M byte memory space.

  • Page 35: Control Panel

    REV.-A 1.7.2 Control Panel The Control Panel is, which includes the indicator LEDs, switches, and DIP switches. Figure 1-14. Control Panal 1.7.3 C076 PSB/PSE Board (Power Supply Circuit Board) The power supply unit consists of a switching regulator circuit, which converts the AC line voltage to the DC voltages (for example, + 35V and + 5V) used by the printer.

  • Page 36: Printer Mechanism (M.471 O/476 O

    REV.-A 1.7.4 Printer Mechanism (M-4710/4760) The M-47 10/4760 printer mechanism developed specifically for SQ-870/l 170 printer. Included the components are a carriage motor, carriage mechanism, paper-feed motor, paper-feed mechanism, TE motor, top edge holding mechanism, pump motor, pump mechanism, printhead, and sensors. This printer mechanism allows three ways of paper insertion.
  • Page 37 REV.-A CHAPTER 2 OPERATION PRINCIPLES OPERATING PRINCIPLES OF PRINTER MECHANISM....2-1 Printhead Mechanism .............2.2 2.1.1. 2.1.2. Carriage Mechanism ...............2.4 Paper Feed Mechanism ............2.6 2.1.3. 2.1.3.1 Paper Feeding Mechanism........2-6 2.1.3.2 Release Lever Operation.........2.8 2.1.3.3 Paper Insertion entrance ........2.l O 2.1.3.4 Top Edge Holder Mechanism Operation ...2 -13 2.1.4 Ink Mechanism .
  • Page 38 REV.-A LIST OF FIGURES Figure 2-1. Block Diagram of Printer Mechanism -Model -47 10/4760 ................Figure 2-2.
  • Page 39 REV.-A Figure 2-35. Operational Sequence of Ink Mechanism and Carriage Position ..............2.22 Figure 2-36. Interlock Switch ...............2-26 Figure 2-37.

  • Page 40: Operating Principles Of Printer Mechanism

    REV.-A 2.1 OPERATING PRINCIPLES OF PRINTER MECHANISM This section describes functions and operations of the printer mechanism - Model-47 10/4760. Modei-47 10/4760 is a serial type printer mechanism with a 48-nozzle printhead. This printer mechanism consists of the printhead unit, paper feed unit, ink mechanism, and sensors. Figure 2-1 shows the block diagram of the printer mechanism –...

  • Page 41: Printhead Mechanism

    REV.-A 2.1.1 Printhead Mechanism The printhead of this printer employs the on-demand method, where part of the ink stored in the reservoir within the printhead is supplied into the nozzle each time ink in the nozzle chamber is injected. Figure 2-2 shows the internal structure of the printhead. The functions of the major components are explained below.
  • Page 42 REV.-A < Printing > This section describes how ink is injected through the nozzles. (1) Normal condition ---Piezoelectric Element is electrically charged and bent inward. Piezoelectric Element Figure 2-4. Printing Principle (1) (2) Charging operation --When the electric charge of the piezoelectric element is gradually discharged, the element is bent outward to let ink into the pressure chamber.

  • Page 43: Carriage Mechanism

    REV.-A 2.1.2 Carriage Mechanism The timing belt attached to the base of the carriage is driven by the carriage motor and the pulley. This makes the carriage (printhead) move along the guide shafts. A scale made of polyester (DETECTION, PLATE, PTS) is provided along the motion range of the carriage. The optical linear encoders mounted on the carriage scan this scale and output one pulse of signal each time the carriage moves 1/1 20 inch.
  • Page 44 REV.-A < Adjustment of Platen Gap > The platen gap must be adjusted with the head adjust lever (LEVER, GAP, ADJUST) depending on the thickness of paper. When the head adjust lever is operated, it turns the carriage guide shaft (SHAFT, CR, GUIDE, MAIN) and makes the carriage closer/farther to/from the platen.

  • Page 45: Paper Feed Mechanism

    REV.-A 2.1.3 Paper Feed Mechanism The paper feeding method for this printer is divided into the friction feed method and the tractor feed method. The tractor feed method is further divided into the push tractor method and the push/pull tractor method. (This printer is provided with a standard tractor which performs “’push-type” feeding. In order to perform “push/pull-type”...
  • Page 46 REV.-A Push Tractor Method paper is engaged to the tractor by mating the holes of paper to the pins In this method, continuous feed motor (STEPPING MOTOR, PF) is driven, the gears connected to the of tractor. When the paper motor are rotated in the direction of the black arrows and rotate the platen, paper tension roller, and push tractor.

  • Page 47: Release Lever Operation

    REV.-A Push-Pull Tractor Method This method is a combination of the above-mentioned push tractor method and the pull tractor method. The push tractor pushes the paper toward the printhead, while the pull tractor pulls the paper from the printhead. This provides more accuracy in paper feeding operation. Figure 2-11 shows the push-pull tractor method from the rear feeding slot.
  • Page 48 REV.-A When the release lever is shifted as described above, the arrangement of the gears is changed accordingly to enable various types of paper feeding operation (such as front push tractor feeding or rear push tractor feeding) or to disable either. Therefore, you can set continuous paper to each push tractor (front and rear) and switch between the two only by shifting the lever.

  • Page 49: Paper Insertion Entrance

    REV.-A 2.1.3.3 Paper Insertion entrance The foIlowing few pages describe the paper feeding method in relation to the paper feeding insertion. Top Entrance The top entrance is used in the friction feed method. The paper inserted through this entrance is detected by the rear PE sensor (DETECTOR ASSY., REAR).
  • Page 50 REV.-A Paper Paper Tension Roller Printhead Rear PE Sensor Figure 2-18. Rear Entrance - Push-Pull Tractor Method Front Entrance The front entrance is used in the friction feed method or the tractor feed method (Push tractor method or Push-pull tractor method). The paper inserted through this entrance is detected by the front PE sensor (DETECTOR, PE, FRONT).
  • Page 51 REV.-A Paper Paper Tension Roller \ Printhead Front PE Sensor Figure 2-20. Front Entrance - Push Tractor Method .,. . ‘ ~ Paper, Pull Tractor Paper Tesion Roller x - i / ‘7 Pnnthead Front PE Sensor ~Front Push Tractor Figure 2-21.

  • Page 52: Top Edge Holder Mechanism Operation

    REV.-A 2.1.3.4 Top Edge Holder Mechanism Operation This mechanism is provided to minimize unprintable area at the top edge of paper. The top edge of paper fed around the platen is held by the top edge holder plate until the top edge is delivered to the position where the paper tension roller comes down to hold the paper.

  • Page 53: Ink Mechanism

    REV.-A c : . . ~ . 2.1.4 Ink Mechanism ,’.,, ,..., The ink mechanism consists of the following parts. Ink cartridge (Ink cartridge holder, Ink end sensor, Ink cartridge sensor) Pump unit Pump mechanism (Pump motor) Cap mechanism Printhead cleaning mechanism (Cleaner blade, Rubbing blade) Carriage lock mechanism Wasted ink drain tank Figure 2-23 shows the system outline of the ink mechanism.

  • Page 54: Pump Motor

    REV.-A 2.1.4.1 Pump Motor The pump motor drives the pump, cleaner blade, rubbing blade, and carriage lock lever (set/reset) through several gears. Pump Motor Cleaning Blade Drive Gear Gear Cleaner Lever Rubbing Cleaner Blade CR Stopper 2-24. Pump Motor Figure Table 2-2.

  • Page 55: Pump Mechanism

    REV.-A 2.1.4.2 Pump Mechanism The pump draws ink from the nozzles of the printhead and sends it to the wasted ink drain tank. This operation is performed to eliminate dust./bubbles within the nozzles. Figure 2-25 illustrates the operation of the pump. When the pump motor rotates CCW, the pulley pumps in the wheel pump unit rotate in the direction of the arrow while compressing the ink tube.

  • Page 56: Cap Mechanism

    REV.-A 2.1.4.3 Cap Mechanism This mechanism is provided to prevent the nozzles from drying or forming bubbles while they are not used. In this mode, when the pump is driven with the cap closely contacted to the nozzles, the internal pressure of the capped section becomes lower than that of the printhead section.

  • Page 57: Mechanism

    REV.-A 2.1.4.4 Cleaning Mechanism and Carriage Lock Mechanism The cleaning operation consists of rubbing operation and cleaner blade operation. (The rubbing operation is performed to remove head preserving liquid, ink, or dust which is heavily adhered to the surface of the printhead, while the cleaner blade operation is performed to remove ink or dust lightly stuck to the surface of the printhead.) In the rubbing operation, the ink, etc.
  • Page 58 REV.-A The pad and blade is attached to the cleaner lever. When the pump motor rotates clockwise, the spur gear (20) is rotated and thus sets the lever forward. When the pump motor rotates counter-clockwise, the cleaner lever is reset. The spur gear will be disengaged from the cleaner lever as soon as the lever is either set or reset.

  • Page 59: Ink Cartridge And Ink End Sensor

    REV.-A 2.1.4.5 ink Cartridge and Ink End Sensor Mechanism The structure of the ink cartridge is shown in Figure 2-32. The ink cartridge contains an ink pack and an ink end detection plate. The detection pIate gradually sticks out as the ink inside the cartridge runs short. The ink end sensor (DETECTOR ASSY., INK) is designed to detect this plate.

  • Page 60: Wasted Ink Drain Tank

    REV.-A 2.1.4.6 Wasted Ink Drain Tank Used ink is collected into the wasted ink drain tank. The wasted ink drain tank has the absorber to collect used ink through the tube, and the opening which lets out the vapor from ink. This tank is provided with a sufficient capacity to collect the waste ink that is used during the whole printer life.

  • Page 61: Operational Sequence Of Ink Mechanism

    REV.-A 2.1.4.7 Operational Sequence of Ink Mechanism Ink Mechanism comprises of various steps of operation. The following are some of the basic steps of operation. Ink flushing operation In this operation, the printhead is moved to the position where the cap covers the nozzles (the refresh position) and then ink is injected from all the nozzles toward the cap.
  • Page 62 REV.-A The basic steps of operation described above are combined in many ways to meet various conditions of the printer as described below. (1) Power ON operation At time of power on, four different ways of operation are possible depending on the carriage position and timer value.
  • Page 63 REV.-A a) CL1 (Normal cleaning) This operation consists of the cleaner blade operation-1, negative pressure release operation, and cleaner blade operation-2. b) CL2 (Intensive cleaning) This operation is performed when the cleaning switch is pressed before 200 lines are printed after the last cleaning operation.
  • Page 64 REV.-A a) Initial charge operation-1 This operation is performed when the printhead is not capped at the time the user operates the initial charge operation. It consists of the cleaner blade operation-1, ink charge operation for 60 seconds, negative pressure release operation, rubbing operation for 5 times, ink charge operation for 5 seconds, and negative pressure release operation.

  • Page 65: Case Open Interlock Switch

    REV.-A (6) Wasted ink drain tank replacement operation In normal use condition, this tank has a sufficient capacity to collect all the ink to be wasted during the whole printer life. However, if an unexpectedly large amount of ink is wasted in excessive cleaning operations or power on operations, the tank may be fulfilled.

  • Page 66: Operating Principles Of Power Supply Circuitry

    REV.-A 2.2 OPERATING PRINCIPLES OF POWER SUPPLY CIRCUITRY C076PSB board (120V) or C076PSE The power supply circuitry of this printer is provided with either board (220/240 V). Both boards operate in the same way although the elements in the primary circuit are partly different.
  • Page 67 REV.-A +35 VDC over voltage protection circuit When the voltage of the +35 VDC line exceeds a certain value (+36V), the switching circuit is turned off to stop the generation of +35 VDC voltage. + 35VDC under voltage protection circuit When the voltage of the +35VDC line goes lower than a certain value, the switching circuit is turned off to stop the generation of +35 VDC voltage.

  • Page 68: Operating Principles Of Control Circuitry

    REV.-A 2.3 OPERATING PRINCIPLES OF CONTROL CIRCUITRY This section describes the operating principles of the control circuitry of this printer - C076 MAIN board. 2.3.1 Control Circuitry Overview The C076 MAIN board is provided with wPD70325 (V25 +) (9.5 MHz) – a 16-bit one-chip micro- processor, E05A65 - a gate array with memory management function, and E05A48 –...
  • Page 69 REV.-A Table 2-6 lists the functions of major elements on the C076 MAIN board. Table 2-6. Major Elements on C076 MAIN Board and Their Functions Element Location ~ Function wPD70325 The CPU of this board. It receives data from the host and stores (V25 +) (V25 +) ‘...

  • Page 70: Reset Circuit

    REV.-A 2.3.2 Reset Circuit When the power in turned on, the reset IC(MB3771 ), which monitors the + 5 VDC line, keeps outputting RESET signals until +5 VDC is stable. This controller can also reset itself by setting RSTRG signal(160 pin of E05A65 gate array) to LOW.

  • Page 71: Paper Feed Motor Drive Circuit

    REV.-A 2.3.4 Paper Feed Motor Drive Circuit A stepping motor is used in the paper feed motor drive circuit of this printer. The motor is driven by 2-2 phase excitation and constant-current arrangement. For a single pulse, paper is fed 1/360 inch (minimum value). The acceleration/deceleration control is not applied to the paper feed rate less than 3 steps.

  • Page 72: Carriage Motor Drive Circuit

    REV.-A 2.3.5 Carriage Motor Drive Circuit speed, the gate This printer uses a DC motor for the carriage drive. To drive the motor at a constant array E05A48 monitors the encoder signals and then supplies proper voltage to the motor by turning the motor power on/off.

  • Page 73: Printhead Drive Circuit

    REV.-A 2.3.6 Printhead Drive Circuit Figure 2-43 shows the printhead drive circuit. The print data developed by CPU is transferred to the head control gate array - E05A65 (ICI 2) via data bus. The data for 48 nozzles stored in E05A65 is serially transmitted from HDDAT port to the head driver - ~PD 1632 (IC8,9).
  • Page 74 REV.-A (1) Charge/discharge circuit Figure 2-44 shows the chargeidischarge circuit, VH A ~Mnchage yPDl 6322 (IC8, 9) ALDCHG HI-48 DSCHG Figure 2-44. Charge/Discharge Circuit < Charge pulse > When the gate array (E05A65) outputs HIGH pulse from CHG port, the transistors (Q3,9) go ON and thus the Vh voltage charges the piezoelectric elements (PZD) through the diode (DCH) and resistor (RCH).

  • Page 75: Pump Motor Drive Circuit

    REV.-A Figure 2-47 shows the timing for discharge/charge pulse. Pulse Figure 247. Timing for Discharge/Charge (2) Printhead Voltage Supply Circuit The viscosity of ink is subject to change due to the temperature. If the viscosity is too high, ink injection c’...

  • Page 76: Te Motor Drive Circuit

    REV.-A 2.3.8 TE Motor Drive Circuit A stepping motor is used to drive the TE motor. The phase data for the stepping motor is transmitted from the port on E05A65 to the driver - PU 1501, and controls the stepping motor by constant-voltage mode.

  • Page 77: Eeprom Control Circuit

    REV.-A 2.3.10 EEPROM Control Circuit This printer is provided with an EEPROM to store the data such as panel settings, paper position data (Paper cut position/Current printed line), wasted ink drain tank replacement counter, etc. when the main power is OFF. When the main power is ON, the data is stored in the RAM. But the data in the RAM will be erased as soon as the main power is turned off.

  • Page 78: Disassembly And Assembly

    REV.-A CHAPTER 3 DISASSEMBLY AND ASSEMBLY 3 . 1 O V E R V I E W ....................3.1.1 Precautions for Disassembling the Printer .
  • Page 79 REV.-A LIST OF FIGURES a False Ink Cartridge ....... . 3 -2 Figure 3-1.
  • Page 80 REV.-A Figure 3-36. Disassembly of Frame Assembly, RIGHT ..... . 3-33 Figure 3-37. Setting Release Lever ............

  • Page 81: Precautions For Disassembling The Printer

    Never fail to read the details of precautions described below. ‘ANGER ~ Danger of explosion if battery is incorrectly replaced. Replace only with same or equivalent type recommended by SEIKO EPSON Co.. Discard used batteries according to government’s safety instruction.
  • Page 82 REV.-A Since this printer employs the ink mechanism, it requires special handling as follows. (1) Ink handling before/after repair The ink path of the ink-jet printer is filled with ink for the whole operating period. Because of this, it is necessary to take the following steps before/after repair. Table 3-1.
  • Page 83 REV.-A < Filling preservation liquid> If it seems to take more than a week before the user receives the printer, fill the printhead with preservation liquid. You can fill the liquid in the following procedure: [Step 1] Set the false ink cartridge on the ink cartridge holder. [Step 2] Insert the preservation liquid charge identity ROM module (TRANSPORTATION LIQUID FILL UP PROGRAM CARTRIDGE #F588) into the ROM cartridge slot.
  • Page 84 REV.-A (2) Wasted Ink Drain Tank This printer is provided with the wasted ink drain tank, which is designed to have a sufficient capacity to collect the waste ink that is used during the whole printer life. However, it must be replaced in the following conditions.
  • Page 85 REV.-A (3) Transportation Make sure the following preparations are properly made before delivering the printer. Capping Removing ink cartridge Setting shockproof attachments Packaging Packing Material Protective Sheet Packing Material Figure 3-3. Setting Shockproof Attachments...
  • Page 86 REV.-A The procedures (1) (2) (3) described above are listed in Table 3-2. (Also refer to Table 3-7) Table 3-2. Service Process Procedure Description Cartridge used Remarks Capping Cap the head None Power on/off or manually Ink discharge Remove all the ink False ink cartridge Perform cleaning in the ink path...
  • Page 87 Dummy register #F591 1 0 1 1 9 7 4 Dial gauge #F603 1 0 1 1 0 1 8 Dial gauge base Note: o = market purchase, E = exclusive tool of EPSON Table 3-4. Instruments Designation Specification Oscilloscope...
  • Page 88 REV.-A < Screw designation> Ail small parts, such as screws and washers, are indicated by abbreviations. Table 3-5. Abbreviations List of Small Parts Part Name Abbreviation C.P.S. Screw Cross-recessed Pan-head S-tight screw C.B. B. Screw Cross-recessed Bind-head B-tight screw C.C.U. Screw Cross-recessed Cup-head Uska screw C.
  • Page 89 REV.-A 3.1.3 Service Check List After servicing, be sure to check the printer for any abnormality using the following list. Table 3-7. Service Check List Category Component Item to Check Is Check Required? Printer Printhead Nozzle clogging Checked, Not necessary features Carriage Does the carriage move smoothly?
  • Page 90 REV.-A 3.2 DISASSEMBLY AND ASSEMBLY This chapter describes procedures for disassembling main components of this printer. Unless otherwise specified, the disassembled unit or components can be reassembled simply by performing the disassembly procedure in the inverted sequence. The assembly procedure is, therefore, omitted in this manual.

  • Page 91: Housing Removal

    REV.-A 3.2.1 Housing Removal This paragraph describes the procedures for removing the HOUSINGS, FRONT and UPPER. [Step 1] Remove the SHEET GUIDE ASSY., REAR, the COVER, PRINTER, the COVER, FRONT, the SHEET GUIDE ASSY., FRONT, the tractor, and the knob. [Step 2] Unscrew C.B.

  • Page 92: Printhead Replacement

    REV.-A [Step 6] Disconnect the connector that connects the interlock switch to the resistor at the rear of the printer mechanism. [Step 7] Raise the front side of the HOUSING, UPPER with the rear side held. Figure 3-8. Housing Removal (3) 3.2.2 Printhead Replacement This section describes the procedures for disassembly and assembly of the printhead.
  • Page 93 REV.-A ASSEMBLY POINTS When assemble the printhead, follow the procedures shown below. Verify that the PIN, ADJUST on the carriage is set in the direction as shown in the Figurt [Step 1] below. PIN, ADJUST Mark Mark l - l I I I I ~.arriw Figure 3-10.
  • Page 94 REV.-A REQUIRED ADJUSTMENT ITEMS If you have disassembled/assembled the printhead, make the following adjustment after repair. Printhead slant adjustment (Refer to section 4.5. 1.) If you have replaced the printhead, make the following adjustment in the specified sequence, (1) Platen gap adjustment (Refer to section 4.2.) (2) Printhead drive voltage adjustment (Refer to section 4.4.) 3.2.3 Wasted Ink Drain Tank Replacement (TANK, INK EJECT) This section describes how to replace the wasted ink drain tank.

  • Page 95: Printer Mechanism Removal

    REV.-A 3.2.4 Printer Mechanism Removal This section describes how to remove the printer mechanism. W A R N I N G When working with the printer mechanism, take sufficient care in handling the ink. Carefully read the precautions in 3.1.1 before beginning the work. C A U T I O N Discharge ink from the printer before removing the printer mechanism.
  • Page 96 REV.-A [Step7] Disconnect the following connectors, which connect the printer mechanism to the MAIN board; CN 13 (Blue/6 pins), CN 14 (White/6 pins), CN 12 (White/2 pins), CN15 (White/2 pins), CN 18 (FPC/26 pins), CN 17 (FPC/36 pins), CN 11 (White/3 pins), CN 10 (Blue/3 pins), CN9 (Yellow/2 pins), CN8 (White/2 pins).

  • Page 97: Circuit Board Removal

    REV.-A REQUIRED ADJUSTMENT ITEMS If you have replaced the printer mechanism, make the following adjustment in the specified sequence. (1) Prlnthead drive voltage adjustment (Refer to section 4.4.) (2) Print position adjustment (Refer to section 4.5.2.) 3.2.5 Circuit Board Removal This section describes how to remove the MAIN board and the POWER SUPPLY board.
  • Page 98 REV.-A A S S E M B L Y P O I N T S If you have replaced the MAIN board, take the weight of the wasted ink drain ink tank and replace it if the weight exceeds 240g. If you have replaced the MAIN board, reset the wasted ink tank replacement counter before making the following adjustments.
  • Page 99 REV.-A 3.2.6 HOLDER ASSY., INK CARTRIDGE Removal [Step 1] Remove the housing. (Refer to section 3.2.1.) [Step2] Remove the printer mechanism. (Refer to section 3.2.4) [Step 3] Unscrew C.B.B. screw (M3X 12) which fastens the HOLDER ASSY., INK CARTRIDGE to the HOUSING, LOWER to remove the HOLDER ASSY., INK CARTRIDGE together with the TORSION SPRING, 3490 and the COVER, HOLDER, INK CARTRIDGE.

  • Page 100: Printer Mechanism Disassembly

    REV.-A 3.2.7 Printer Mechanism Disassembly This section describes how to disassemble the printer mechanism. W A R N I N G When working with the printer mechanism, take sufficient care in handling the ink. Carefully read the precautions in 3.1.1 before beginning the work. 3.2.7.1 Disassembly of PAPER HOLDING ASSY.
  • Page 101 REV.-A 3.2.7.2 Disassembly of CAP ASSY. [Step 1] Remove the housing. (Refer to section 3.2. 1.) [Step2] Remove the printer mechanism. (Refer to section 3.2.4.) [Step 3] Unscrew the 3 screws (C.B.S. screw (M3x8)) which fasten the FRAME, STRENGTHEN LEFT, and remove the FRAME, STRENGTHEN RIGHT.
  • Page 102 REV.-A 3.2.7.3 Disassembly of PUMP ASSY. and CLEANER ASSY. [Step 1] Remove the housing. (Refer to section 3.2. 1.) [Step 2] Remove the printer mechanism. (Refer to section 3.2.4.) [Step 3] Remove the CAP ASSY.. (Refer to section 3.2.7.2.) [Step 4] Remove the TUBE, SUPPLY, INK, from the PUMP ASSY..
  • Page 103 REV.-A 3.2.7.4 FRAME, FRONT Removal [Step 1] Remove the housing. (Refer to section 3.2. 1.) [Step2] Remove the printer mechanism. (Refer to section 3.2.4) [Step3] Remove the CAP ASSY.. (Referto section 3.2.7.2.) [Step4] Remove the TUBE, SUPPLY, INK from the hook on the PUMP ASSY.. [Step 5] Remove the harness of the platen gap sensor from the clamp in the rear of the printer mechanism.
  • Page 104 REV.-A 3.2.7.5 Carriage Motor (DC MOTOR, CR) Removal [Step 1] Remove the housing. (Refer to section 3.2.1.) [Step 2] Remove the printer mechanism. (Refer to section 3.2.4.) [Step 3] Remove the CAP ASSY.. (Refer to section 3.2.7.2.) [Step 4] Remove the FRAME, FRONT. (Refer to section 3.2.7.4.) [Step 5] Unscrew the 3 screws (C.B.S.
  • Page 105 REV.-A 3.2.7.6 Disassembly of Carriage Remove the housing. (Refer to section 3.2. 1.) [Step 1] Remove the printer mechanism. (Refer to section 3.2.4.) [Step 2] [Step 3] Remove the printhead. (Refer to section 3.2.2.) [Step 4] Remove the CAP ASSY.. (Refer to section 3.2.7.2.) Remove the FRAME, FRONT.
  • Page 106 REV.-A ‘ss’”6” ‘“’N’s When engaging the timing belt to the carriage, make sure that 3 grooves can be seen at the end of the belt as shown in Figure 3-27. Timing Belt e’” ..’, grooves Figure 3-27. Engaging Timing Belt REQUIRED ADJUSTMENT ITEMS you have reassembled the carriage, make the following adjustment in the specified sequence.
  • Page 107 REV.-A 3.2.7.7 STEPPING MOTOR, PF Removal [Step 1] Remove the housing. (Refer to section 3.2. 1.) [Step2] Remove the printer mechanism. (Refer to section 3.2.3) [Step 3] Unscrew the CUP screw (M3X8) and the C.B.S. screw (M3X8) which fasten the STEPPING MOTOR, PF to the FRAME, SUB, RIGHT, and remove the STEPPING MOTOR, PF.
  • Page 108 REV.-A 3.2.7.9 Disassembly of PLATEN ASSY. [Step 1] Remove the housing. (Refer to section 3.2.1.) [Step 2] Remove the printer mechanism. (Refer to section 3.2.4.) [Step 3] Remove the CAP ASSY.. (Refer to section 3.2.7.2.) [Step 4] Remove the FRAME, FRONT. (Refer to section 3.2.7.4.) [Step 5] Remove the PAPER HOLDING ASSY..
  • Page 109 REV.-A [Step 12] Rotate the HOLDER, PLATEN, RIGHT and HOLDER, PLATEN, LEFT which fasten the PLATEN ASSY. to the frame, LEFT/RIGHT, and remove the PLATEN ASSY.. HOLDER, PLATEN, LEFT/RIGHT Figure 3-31. Disassembly of PLATEN ASSY. (2) ASSEMBLY POINTS When assembling the GUIDE, PAPER EJECT be sure to hook the TORSION SPRING 700 to the GUIDE PAPER EJECT.
  • Page 110 REV.-A REQUIRED ADJUSTMENT ITEMS If you have reassembled the carriage, make the following adjustment in the specified sequence. (1) Timing belt tension adjustment (Refer to section 4.3.) (2) Platen gap adjustment (Refer to section 4. 1.) (3) Platen gap adjustment (Refer to section 4.2.) (4) Printhead slant adjustment (Refer to section 4.5.1) (5) Print position adjustment (Refer to section 4.5.2) ‘.;...
  • Page 111 REV.-A 3.2.7.10 Disassembly of PAPER GUIDE IStepl] Remove thehousing. (Refer to section 3.2.1.) [Step2] Remove the printer mechanism. (Refer to section 3.2.4) [Step3] Remove the CAP ASSY.. (Refer to section 3.2.7.2) [Step4] Remove the FRAME, FRONT. (Refer to section 3.2.7.4) [Step5] Remove the PAPER HOLDING ASSY..
  • Page 112 REV.-A A S S E M B L Y P O I N T S When attaching the FRAME ASSY., RIGHT to the PAPER GUIDE, make sure the SHAFT, RELEASE of the PAPER GUIDE, RIGHT is set in the proper direction as shown below. PAPER GUIDE Figure 3-35.
  • Page 113 REV.-A 3.2.7.11 Disassembly of FRAME ASSY., RIGHT Remove the housing. (Refer to section 3.2. 1.) [Step 1] [Step 2] Remove the printer mechanism. (Refer to section 3.2.4.) Remove the CAP ASSY.. (Refer to section 3.2.7.2.) [Step 3] [Step 4] Remove the FRAME, FRONT. (Refer to section 3.2.7.4.) [Step 5] Remove the STEPPING MOTOR, PF.
  • Page 114 REV.-A ASSEMBLY POINTS sure that all the teeth of the When attaching the release lever to the FRAME ASSY., RIGHT, make gap gear are fully engaged with the teeth of the release lever. Release Lever INTERMITTED Gear Posifien Figure 3-37. Setting Release Lever ,: Z.
  • Page 115 3.2.7.12 Disassembly of TRACTOR ASSY. [Step 1] Remove the TRACTOR GEARS (left/right) attached on the SHAFT, TR, DRIVE, and remove the FRAME, TR, (left/right). [Step 2] Remove the E-rings (6) attached on the SHAFT, TR, DRIVE, and remove the tractors (left/right). FRAME, TR, LEFT TRACTOR GEAR ,,../”...
  • Page 116 REV.-A CHAPTER 4 ADJUSTMENTS 4.1 PLATEN GAP PARALLELISM ADJUSTMENT ......4-1 4.2 PLATEN GAP ADJUSTMENT .

  • Page 117: Platen Gap Parallelism Adjustment

    REV.-A This chapter describes the various adjustments you should make after you disassemble or replace any parts or components that require adjustment. Needless to say, you should also make adjustment in any case if the printer does not function properly or print quality is not good enough. Other conditions that require adjustment are described in this chapter.

  • Page 118: Platen Gap Adjustment

    REV.-A [Step 4] Adjust the LEVER, PARALLEL, ADJUST so that the long needle of the dial gauge indicates a constant value at any point on the platen with an allowance of 3 divisions (0.03 mm) when you move the carriage to the left and right. /’- Carriage SHAH, CR, MAIN...
  • Page 119 REV.-A [Step2] Insert the thickness gauge (exclusively made by EPSON) between the platen and the printhead, and rotate the SHAFT, CR, MAIN so that the head is pressed lightly against the head. When rotating the SHAFT, CR, MAIN, you can make use of the notch at the right side of the shaft.

  • Page 120: Timing Belt Tension Adjustment

    REV.-A 4.3 TIMING BELT TENSION ADJUSTMENT This adjustment is to change the tension of the timing belt to a proper level. If this adjustment is not performed properly, bi-directional printing settings will be interfered. This adjustment is required when you loosened the timing belt for disassembling or assembling the printer or when the bi-directional print position cannot be aligned.

  • Page 121: Printhead Drive Voltage Adjustment

    REV.-A 4.4 PRINTHEAD DRIVE VOLTAGE ADJUSTMENT Printhead drive voltage of each printhead should be adjusted individually, because all printheads are not exactly of the same characteristics. If it is not adjusted properly, print quality will be degraded. This adjustment is required when the printhead or the printer mechanism is replaced.
  • Page 122 Table 4-1. Head Drive Voltage and Jumper Setting Head Drive Voltage (V) Jumper 5 Setting Jumper 6 Setting 122.2- 123.7 120.7- 122.1 118.8- 120.6 - 118.7 117.1 1 1 7 . 0 115.5- 1 1 3 . 8 - 1 1 5 . 4 1 1 2 .
  • Page 123 REV.-A When only the MAIN board is replaced: [Step4] Set the jumpers (5 and 6) on the MAIN board according to the settings confirmed in Step 3, and install the main board to HOUSING, LOWER. When either the printhead or the printer mechanism is replaced: Set the jumpers (5 and 6) on the MAIN board according to the settings confirmed in Step MAIN Board Jumper...

  • Page 124: Print Adjustment

    The print adjustment can be divided into the printhead inclination adjustment and print position adjustment. These adjustments can be performed by running the special program on the personal computer (EPSON PC/EQUITY or 100% IBM PC compatible machine) connected to the printer. 4.5.1 Printhead Slant Adjustment If the printhead is not installed at the right angle to the carriage, the characters will not be printed at the right angle.

  • Page 125: Print Position Adjustment

    REV.-A [Step 1 1] Center the carriage and loosen the screw (fastening the printhead)on the righthand side. Then, holding the head with the hand, turn the PIN, ADJUST. The PIN, ADJUST can be turned to 5 different positions. Printhead inthead Fixed Screw PIN, ADJUST Figure 4-9.

  • Page 126: Volume Vr1 Adjustment On Main Board

    REV.-A [Step 6] When “’80 COLUMN...1, 136 COLUMN...2° is displayed, select 80 column or 136 column for your machine. [Step 7] When “BI-D...1, HEAD TILT...2, END...E” is displayed, select ‘“BI-D” by entering “l’”. [Step 8] When “PRINTER No.?” is displayed, enter the applicable printer number and press the return key.

  • Page 127: Troubleshooting

    REV.-A CHAPTER 5 TROUBLESHOOTING 5 . 1 O V E R V I E W ....................5.2 REPAIR BY UNIT REPLACEMENT .
  • Page 128 REV.-A 5.1 OVERVIEW The task of troubleshooting is not an easy job, even a single trouble may exhibit a variety of symptoms. Figure 5-1 show a flowchart, by which you can easily determine the cause of trouble. UnitRepla@rnent Service Check List I I-=7-l Figure 5-1.
  • Page 129 REV.-A In order to check the waveforms of the MAIN board, you can use the extension cable provided for this printer. You can remove the MAIN board from the lowercase and still check its waveforms by connecting the board to the printer mechanism with these cables. The following table shows extension cables and connecting points.

  • Page 130: Figure 1-14. Control Panel

    REV.-A 5.2 REPAIR BY UNIT REPLACEMENT When a problem occurs, you can separate a particular unit that is responsible for the particular problem by referring to the symptoms listed below. Refer to Table 5-4, identify what the problem is, and then perform the checks according to the corresponding flowchart.
  • Page 131 REV.-A (1) Printer fails to operate at time of power on. Use the correct input voltage. Replace the fuse and pull out CN4 on the MAIN board. Check the outpui “Yes volta e of the power boar . power Replace the Replace the MAIN board.
  • Page 132 (2) Error is detected. Read the error message displayed (Refer to table 5-2) Check the cable connection on the control panel. Connect the cable Replace the Turn off the power control Panel. supply and try to move the carriage manually. Replace the printer mechanism.
  • Page 133 ‘r’es Replace the HOLDER ASSY., INK CARTRIDGE. Wasted ink drain tank overflow. Replace the Replace the wasted ink MAIN board. drain tank...
  • Page 134 during self test. (3) Print failure occurs Set the adjust lever in the correct position and execute self-test. connected correctly ? Connect each connector dot is missing or correctly. < print density is incorrct. ) Excute the adjustment Press the CLEANING for printhead slant and Bi-d print.
  • Page 135 REV.-A (4) Paper is not fed normally. anfirm that there are no stray pieces of paper or anything else nothing abnormal within the paper the paper path. Remove any stray pieces or other foreign objects power Turn o the < turn smoothly ? Replace the printer mechanism.
  • Page 136 REV.-A (5) Control panel does not function normally. Connect the control panel cable correctly, Replace the control panel. Replace the MAIN board.
  • Page 137 REV.-A (6) The printer does not function normally in on-line mode. Execute self-test. Refer to other sedon for troubleshooting. Check the setup values between printer and (7 ..host computer. > Parallel Replace option interface board.
  • Page 138 REV.-A 5.3 REPAIR OF POWER SUPPLY BOARD This section describes the problems related to the power supply board. The table below provides various symptoms, likely causes, and checkpoints. The checkpoints refer to waveforms, resistance, and other values to be checked to evaluate the operation of each component. Check these values and take the appropriate action.
  • Page 139 REV.-A Table 5-5. Repair of Power Supply Board (Cont.) Symptom Conditon Cause Checkpoint Solution The printer +35V line +5V line is Check the +35V line. does not op- dead. is dead. crate at all. IC51 is Replace Check the oscillation waveform and switching dead.
  • Page 140 REV.-A 5.4 REPAIR OF MAIN BOARD This section describes the problems related to the MAIN board. The table below provides various symptoms, likely causes, and checkpoints. The checkpoints refer to waveforms, resistance, and other values to be checked to evaluate the operation of each component. Check these values and take the appropriate action.
  • Page 141 REV.-A M a i n B o a r d (Cont.) Rcmair nf Tmhln K-G -..—-—- — . — ——. -—. ..-~-.. ““. ” Solution Checkpoint Cause S y m p t o m I C o n d i t o n Replace CG The CPU Either CG or...
  • Page 142 Table 5-6. Repair of the Main Board (Cont.) Checkpoint Solution Conditon Cause Symptom The carriage The carriage IC 10 is Check the oscillator waveform at pins 27, 25, Replace Ic 10. 32 and 31 of ICIO. does not op- does not op- defective.
  • Page 143 REV.-A Ransir nf the M a i n B o a r d (Cont.) T=hlta RR , -— .., .. ----- — ““. .. -~.-.. ” 5-16...
  • Page 144 Table 5-6. Repair of the Main Board (Cont.) Checkpoint Symptom Conditon Cause Solution The top 21, 22, 23 and Replace ICI 2 is Check output signal at pin TE motor Ic12. edge hold- does not ro- defective. 24 of IC 12. ing mecha- tate at all.
  • Page 145 REV.-A MECHANISM 5.5 REPAIR OF THE PRINTER should be repaired according to the troubleshooting Troubles related to the printer mechanism procedures in Table 5-7. Table 5-7. Repair of Printer Mechanism Condition Cause Checkpoint Solution Symptom Remove any for. The pump motor Foreign substances Manually drive the The pump motor...
  • Page 146 REV.-A .– Table 5-7. ReDair of Printer Mechanism [Cont.} –– — —– –-–-- .— --- . — — ..Solution Condition Cause Checkpoint Symptom The carriage does The carrige motor The pulley is Check for broken Replace the driven not operate normal- rotates, but the...
  • Page 147 REV.-A Table 5-7. Re~air of Printer Mechanism (Cont.) Cause Checkpoint Solution Symptom Condition Abnormal printing. A particular dot is Front of the print- Perform the clean- Clean. not printed. ing operation. head is not clean. The head cable is Check the head ca- Replace the cable.
  • Page 148 Table 5-7. Repair of Printer Mechanism (Cont.) Condition Cause Checkpoint Solution Symptom Paper is not fed Top edge holding The TE motor is Measure the coil Replace the TE motor. normally. mechanism does defective. resistance of the not function TE motor. properly.
  • Page 149 “)
  • Page 150 REV.-A CHAPTER 6 MAINTENANCE 6.1 PREVENTIVE MAINTENANCE ............6-1 6.2 LUBRICATION AND ADHESIVE APPLICATION .

  • Page 151: Preventive Maintenance

    EPSON recommends that the printer be lubricated at the points as listed in Table 6-2. The two recommended lubricants are EPSON O-5, G-1 4, both of which have been tested extensively and found to comply with the needs of this printer.
  • Page 152 REV.-A Table 6-2. Lubrication Points (Refer to Figure 6-2 to Figure 6-3) Ref. No. Lubrication Points Lubricant Sliding surface of the LEVER, RELEASE, SUB. G-1 4 The left shaft of the ROLLER ASSY., DRIVER and the inner side of the G-14 FRAME ASSY., LEFT.
  • Page 153 REV.-A Figure 6-2. Lubrication Points (1)
  • Page 154 REV.-A “L..] Figure 6-3. Lubrication Points (2)
  • Page 155 REV.-A APPENDIX C O N N E C T O R SUMMARY.............., CIRCUIT DIAGRAMS ................A-1 4 CIRCUIT BOARD COMPONENT LAYOUT .
  • Page 156 REV.-A LIST OF TABLES A-1. CNBoard Connector Summary ........Table Table A-2.
  • Page 157 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. Case Open Sensor 0/4760 Printer Mechanism Model-47” Control Panel ~ GAP F/T EDGE PEF PER HEAD HEAD TE CN5 CN6 CN7 CN8 CN1O CN9 CNI1 CN18 CN17 CN13 CN15 2P CN1 r - - - - - - - - - I...
  • Page 158 REV.-A Table A-1. Board Connector Summarv Pins Board Connactor Function CN 1 Parallel interface C076 MAIN board Optional interface card Identity or font module DC power input (C076 PSB/PSE board) Ink cartridge sensor Ink end sensor PG sensor Release sensor Paper-end sensor (front) Top edge sensor CN1O...
  • Page 159 REV.-A Table A-3. CN3(C076 MAIN) (Cont.) Table A-2. CN2 (C076 M A I N ) Signal Name Function Signal Name Function + 5 VDC RAM address bit 15 RAM 15 + 5 VDC CGA16 CG address bit 16 RAM 16 RAM address bit 16 CGA17 CG address bit 17...
  • Page 160 REV.-A Table A-1 1. CN11 (C076 MAIN) Table A-4. CN4(C076 MAIN) Function Signal Name Function Signal Name +5 VDC +5 VDC +5 VDC Paper-end sensor (R) Signal ground Signal ground Signal ground Signal ground Table A-12. CN12 (C076 MAIN) Power ground Function Signal Name Power ground...
  • Page 161 REV.-A Table A-18. CN18 (C076 M A I N ) Table A-17. CN17 (C076 M A I N ) Signal Name Function Signal Name Function Head data 2 Common Head data 4 Common Head data 6 HD 1 Head data 1 Head data 8 Head data 3 Head data 10...
  • Page 162 -— Re~tifier Figure A-4. C076 PSB Board Circuit...
  • Page 163 !s” —— Figure A-5. C076 PSB Board Circuit A-10...
  • Page 164 =r-J’ > —- F i l t e r Ill, R e c t i f i e r A-6. C076 PSE Board Circuit D i a g r a m Figure A-1 1...

  • Page 165: C076 Pse Boerd Circuit Diagram

    c1 . , . . (-’J Figure A-7. C076 PSE Boerd Circuit Diagram A-1 2...
  • Page 166 —-----+11 — Figure A-8. Control Panel Board Circuit Diagram A-1 3...
  • Page 167 REV.-A A.3 CIRCUIT BOARD COMPONENT LAYOUT -— ., – ‘ —..,”, —J . . ~ c’ ,’ Figure A-9. C076 MAIN Board Component Layout (Surface) A-1 4...
  • Page 168 REV.-A C301-J clo3 d“ Figure A-10. C076 MAIN Board Component Layout (Back Side) A-1 5...
  • Page 169 REV.-A II II +- – - L-J I ‘1 .s2.- Nil CM +, 1==-r’:=’os’ II l’% “ ‘ lu~ 10 I I .P5ZI / *– 8“; . m. .“. .?.. * - .,. , , , , , , , , , A.’iu bmn-wa I Figure A-1 1.
  • Page 170 REV.-A II I CN I k-’&-,,E ich “ Assy. 2 0 0 4 2 2 5 0 0 #CHK-S4Xl Figure A-1 2. C076 PSE Board Component Layout A-1 7...
  • Page 171 REV.-A Table A-21. Part No. Reference Table Ref. No. Description Ref. No. Description HOUSING ASSY., LOWER FRAME ASSY., RIGHT SHIELD PLATE MOUNTING PLATE, MOTOR, CR HOUSING, UPPER DC MOTOR, CR HOUSING, FRONT RESISTOR COVER, FRONT HARNESS, TOP EDGE DETECT COVER ASSY., PRINTER CARRIAGE ASSY.
  • Page 172 REV.-A Table A-21. Part No. Reference Table (Cent) Ref. No. Description Ref. No. Description HOLDER, P. GUIDE, SUPPORT, LEFT EDGE SADDLE HOLDER, P. GUIDE, SUPPORT, RIGHT CLAMP ROLLER ASSY., DRIVE PLASTIC RIVET U-TYPE SPRING WASHER M. PLATE ASSY., PULLEY, DRIVEN C.B.
  • Page 173 REV.-A A.5 CASE OUTLINE DRAWING — — $?3 . . , 325 mm Figure A-19. SQ-870 Case Outline Drawing A-26...
  • Page 174 REV.-A & 1“ I -----1 1----1 (yK$ “. ’ 325 mm Figure A-20. SQ-1 170 Case Outline Drawing A-27...
  • Page 175 EPSON SEIKO EPSON CORPORATION PRINTER DIVISION EPSON OVERSEAS MARKETING LOCATIONS EPSON AMERICA, INC. EPSON DEUTSCHLAND GmbH 20770 Madrona Avenue Zulpicher Stra13e 6, 4000 Dusseldorf 11 U . S . A . Torrance CA 90503, F.R. Germany Phone: (02 1 1) 56030...
  • Page 176 EPSON Printed in Japan 92.02 -.7-G...

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