Epson LX-HOO Technical Manual
  1. Manuals
  2. Brands
  3. Epson Manuals
  4. Printer
  5. LX-HOO
  6. Technical manual
Epson LX-HOO Technical Manual

Epson LX-HOO Technical Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual

TECHNICAL MANUAL

EPSON

Advertisement

Table of Contents
loading

Related Manuals for Epson LX-HOO

Summary of Contents for Epson LX-HOO

  • Page 1: Technical Manual

    TECHNICAL MANUAL EPSON...
  • Page 2 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.
  • 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-CERTl- FIED 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 Discusses the options Includes a step-by-step guide for product disassembly, assem- Chapter 4 — bly, and adjustment Provides Epson-approved techniques for troubleshooting Chapter 5 — Chapter 6 — Describes preventive maintenance techniques and lists lubri- cants and adhesives required to service the equipment The contents of this manual are subject to change without notice.
  • Page 5 REVISION SHEET REVISION I DATE ISSUED CHANGE DOCUMENT 1-1, 5, 8, 12 through 18 2-2,11, 13,28,30,38 through 4-1, 13, 17, 19 5-1, 2, 6 A-2, 17, 18...
  • Page 6 REV.-A TABLE OF CONTENTS CHAPTER GENERAL DESCRIPTION CHAPTER 2. OPERATING PRINCIPLES CHAPTER 3. OPTIONAL EQUIPMENT DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT CHAPTER 4. CHAPTER 5. TROUBLESHOOTING CHAPTER 6. MAINTENANCE APPENDIX vi -...

  • Page 7: Table Of Contents

    CHAPTER 1 GENERAL DESCRIPTION FEATURES ....................1-1 INTERFACE .
  • Page 8 Fig. 1-12. ROC Filter Unit (120V Version) ..........1-19 Fig.

  • Page 9: Fig. 1-1. Exterior View Of

    A 3K-byte input buffer for improved throughput from the host computer Pull tractor feeding Optional interface for the EPSON #81 XX series A and the model for all countries except the U.S. and Australia uses printer cover B. Figures 1-1 and 1-2 show the external view of the LX-800. Table 1-1 lists the options.

  • Page 10: Fig. 1-2. Exterior View Of

    REV.-A (Printer Cover B) (Printer Cover A) LX-800 with Tractor Unit Fig. 1-2. Exterior View of Table 1-1. LX-800 Options Description #83 1 0 Roll Paper Holder APPLE II Intelligent Interface #81 33 #8 143 New Serial Interface #8 145 RS-232C/Current Loop Type 2 InterFace Intelligent Serial Interface #81 48...

  • Page 11: Fig.1-4. 57-30360 36-Pin Connector

    REV.-A 1.2 INTERFACE The LX-800 has a 8-bit parallel interface as a standard. The specifications for the 8-bit parallel interface are as follows: 8-bit parallel Data Format: By STROBE pulse Synchronization: By both ACKNLG and BUSY, or either of them Hand Shaking: Logic Level: See Figure 1-3.

  • Page 12: Table 1-2. Connector Pin Assignments And Signal Functions

    REV.-A Table 1-2 shows the connector pin assignments and signal functions of the 8-bit parallel interface. Table 1-2. Connector Pin Assignments and Signal Functions Functional Description Return Pin No. Signal Name Strobe pulse to read the input data. Pulse width STROBE must be more than 0.51Js.

  • Page 13: Table 1-3. Printer Select/Deselect (Dc1/Dc3) Control

    REV.-B NOTES 1. “Return” denotes a twisted pair return line connected to signal ground. When interfacing the printer to the host, use twisted pairs for each signal. Shield the twisted pairs, and connect the shield to GND in order to reduce interface. 2.

  • Page 14: Fig. 1-5. Printhead Pin Configuration

    REV.-A 1.3 SPECIFICATIONS This chapter describes the specifications of the LX-800 printer. General Specifications Serial impact dot matrix Printing method: 9 wires (see Figure 1-5) Pin configuration: Pin diameter: 0.29 mm 0.35 mm (1/72 inch) Dot Pinch: 0.35mm (1 /72”) Fig.
  • Page 15 REV.-A Table 1-4. Printing Speed, Character Size, and Column Width Pitch (meximum Type Style Column Width (maximum Double Empha- Con- Printing Speed (CPS) Height /inch-CPl) Width sized densed Draft — — — (Pica) — — — — — — — 1.05 —...

  • Page 16: Table 1-5. Type Of Paper

    REV.-B Table 1-5. Type of Paper Roll paper Fan-fold paper Cut sheet (Width) (Width) (Width) Size 216 & 3 mm 101 mm to 254 mm 182 mm to 216 mm 4“ to 10” 7. 15“ to 8.5” (Diameter of roll) (Length) Max.

  • Page 17: Fig. 1-6. Printable Area For Cut Sheet Paper

    REV.-A See Figures 1-6 through 1-8 Printable area: 216 mm 7.1 5“ - 8.50/182 mm - Printable area 0.1 2“, 3 mm 0.1 2“, 3 g or more 0.87”, : or n 1 2“”, 305 mm , 3 ( 1 .2’. or mor Fig.
  • Page 18 REV.-A 4“ - 10 ”/101 mm - 254 mm Printable area Printable area 0.35 ”/9 mm or more - - - - - - - - - - - - - - - - - - - - - - - - - - - 0.35 ”/9 mm or more o ABC...
  • Page 19 REV.-A Environmental Specifications Temperature: 5°C to 35”C/4 1“F to 95°F (Operating) 5% to 85%RH, no condensation (Storage) Humidity: 10% to 80%RH, no condensation (Operating) 2G, 1 ms (Storage) Resistance to shock: IG, 1 ms (Operating) Resistance to vibration: 0.25G, max 55Hz (Operating) Reliability 3 million lines (Printer mechanism except the printhead) MCBF:...

  • Page 20: Operating Controls

    REV.-B 1.4 OPERATING CONTROLS This section describes the operating controls of LX-800 printer. The DIP switches that users can set are SW1 and SW2. These switches are positioned at the rear center status 1-8. (Note: the of the of the printer and have the functions shown in Tables 1-6 through switches is read only when at power on or at input of the INIT signal).

  • Page 21: Table 1-7. International Character Set

    REV.-B Table 1-7. International Character Set SW 1-8 SW 1-6 Sw 1-7 Country U.S.A. FRANCE GERMANY U.K. DENMARK SWEDEN ITALY SPAIN Table 1-8. DIP Switches Factory Settings DIP SW No. Country U. S.A., Southeast Asia, Near East Middle and Germany, Northern Europe U.

  • Page 22: Control Panel (And Auto Sheet Load Function)

    REV.-B 1.4.2 Control Panel (and Auto Sheet Load Function) Figure 1-9 shows the control panel of LX-800 printer. Fig. 1-9. Control Panel The functions of the LEDs and switches are: POWER LED (green) Lights when the power switch is turned on and AC power is applied. READY LED (green) Lights when the printer is ready to receive data.

  • Page 23: Self Test And Hexadecimal Dump Functions

    g. DRAFT/LINE FEED and AUTO LOAD Switch (non-locking push switch) When this switch is pressed once in the OFF-LINE mode, the paper is advanced vertically one line, and the paper advanced continuously while this switch is pressed. When this switch is pressed in the ON-LINE mode, the Draft font is selected, and beeps once a buzzer to inform the Draft font is selected.

  • Page 24: Fig. 1-10. Selectype Flow Chart

    REV.-B 1.4.4 SelecType Function switches without software assistance. following 4 type styles can be selected: In the SelecType mode, Emphasized Double-strike Condensed Elite Figure 1-10 shows the operation flow chart of SelecType function: Hold down ON/OFF LINE SW, and press NLQ/FORM FEED SW. (Print- er beeps once and ON-LINE LED starts blinking.) Select the type style >...

  • Page 25: Buzzer And Error Functions

    REV.-B 1.4.5 Buzzer and Error Functions The buzzer rings under the following circumstances: When a BEL code is sent to the printer, the buzzer rings once (for 0.1 sec.). When the NLQ Roman font is set using the FORM FEED switch, the buzzer rings twice (for 0.1 sec.

  • Page 26: Main Components

    REV.-B 1.5 MAIN COMPONENTS The LX-800 consists of the following components: Printer Mechanism Model-3A10 (include the Tractor Unit) ROC Filter Unit ROCX Board Unit Housing 1.5.1 Printer Mechanism Model-3A10 The Model-3A10 printer mechanism was developed expressly for use with LX-800 printer: the components include a carriage motor, carriage mechanism, paper feed motor, paper feed mechanism, ribbon feed mechanism, printhead, sensors, and the tractor unit.

  • Page 27: Fig. 1-13. Roc Filter Unit (220V/240V Versions)

    REV.-A 1.5.2 ROC Filter Unit V version) or AC inlet (220/240 V version), power switch, The ROC filter unit contains a power cord ( 120 fuse, filter circuit, and power transformer. Fig. 1-12. ROC Filter Unit (120V version) Fig. 1-13. ROC Filter Unit (220 V/240V versions) 1-19...

  • Page 28: Rocx Board Unit

    REV.-A 1.5.3 ROCX Board Unit The ROCX board contains the main control circuit, driver circuit, and voltage regulator circuit. The main Fig. 1-14. ROCX Board Unit 1.5.4 LCPNL Board Unit The LCPNL board unit is a control panel of LX-800 which contains the indicator LEDs, switches and buzzer.

  • Page 29: Fig. 1-16. Housing

    REV.-A 1.5.5 Housing The housing is comprised of the upper and lower cases, and paper feed knob, which accommodate the printer mechanism, ROCX board unit, LCPNL board unit, and ROC filter unit. Fig. 1-16. Housing 1-21...

  • Page 30: Operating Principles

    CHAPTER 2 OPERATING PRINCIPLES GENERAL ....................2-1 CABLE CON NECTIONS..

  • Page 31: List Of Figures

    REV.-A 2.4.8 Print Timing Control ..............2 -34 2.4.8.1 Print Timing Control for the Carriage and Printhead .
  • Page 32 REV.-A Fig. 2-24. Paper End Detection Area ............2 -28 Fig.

  • Page 33: General

    2.1 GENERAL This chapter describes the component connections, specifications and operation of the power supply circuit section, the software for the control circuit section, and the operation of the hardware and the printer mechanism. Please note that the following units are assumed when omitted in this chapter. Resistor: Units are Ohms.

  • Page 34: Cable Connections

    REV.-B 2.2 CABLE CONNECTIONS Figure 2-1 shows the interconnection of the primary components, with the main board at the center. MODEL-3A1O PRINTER MECHANISM HOME PRINT PAPER Posh HEAD BOARD B O A R D ) m ~ ( M A I N ROCK FILTER UNIT AC120V 36pin...

  • Page 35: Power Supply Circuit

    2.3 POWER SUPPLY CIRCUIT This section describes the operation of the ROC filter unit circuit on the ROCX board. Figure 2-2 shows the block diagram of the power supply circuit. Table 2-1 shows output voltages and their applications. — - - - - - - - - - 7 _ - _ .

  • Page 36: Fuse And Filter Circuit

    REV.-A 2.3.1.1 Fuse and Filter Circuit The AC input from the power line first flows across the power switch and fuse F1. After being filtered by C 1 and C2, it is supplied to the primary side of the power transformer via the L1/C3 noise prevention circuit.

  • Page 37: Regulator Circuit

    Table 2-2. Power Transformer Output Voltages Rated Voltage No-load AC Voltage [V] Pin No. Type AC [V] DC [V] 27.1 32.3 29.3 220V 240V +9.0/– 9.9 8.33 27.7 33.3 29.3 120V +9.27/– 10.0 8.41 8.96 NOTE: Column “DC @/]” for the rated voltages indicates the output of the transformer when the ROCX board is connected.

  • Page 38: Operation Principles Of Chopper

    2.3.2.1 Operation Principles of Chopper Type Switching Regulator The operating principle of the switching regulator is illustrated in Figures 2-6 and 2-7. “ Fig. 2-6 Chopper Switching Regulator Circuit Vi - Fig. 2-7 Voltage Waveforms When switching transistor St is on, current Is is supplied to inductor L in proportion to time; When energy has accumulated in the inductor L, current 10 is supplied to the load.

  • Page 39: Supply Circuit

    2.3.2.2 +24 V Supply Circuit The +24 V supply circuit is a chopper type switching regulator circuit. Figure 2-8 shows the block diagram of the +24 V supply circuit based on Figure 2-6. LP401 -02SD C3747 3.1 5A 4/0 5 6800 /-f z ~ ~ C26 (3A)
  • Page 40 REV.-A When the printer power is turned on, ZD1 on the +20 VDC line turns on, Q22 turns on, and Vcc is applied to IC 494. Then the oscillator (OSC) starts generating an approximately 20 kHz sawtooth waveform, which is regulated by R40 and C20, and the reference voltage generator outputs the +5 from error amplifiers 1 and 2.

  • Page 41: Control Circuit

    REV.-A 2.4 CONTROL CIRCUIT This section describes the software operation, specifications, and circuit operation of the control circuit 1. Function of the CPU which controls the overall operation and its peripheral circuits (Section 2.4.1) 2. Gate array function (Section 2.4.2) 3.
  • Page 42 REV.-A I l l PESENSOR PAPER FEEC MOTOR CARRIAGE MOTOR HOME PRINT HEAD Fig. 2-11. Control Circuit Block Diagram HOST COMPUTER (OPTIONAL Diagram Fig. 2-11. Control Circuit Block 2-1o...

  • Page 43: Functions Of The Cpu

    REV.-B 2 . 4 . 1 F u n c t i o n s o f t h e C P U The core of the control circuit is the 78 10H CPU (IC2B). Table 2-3 shows the function of each pin and the related circuits.
  • Page 44 REV.-A Table 2-3. CPU Port Assignment (cent’d) Signal Line Port Description Name Number Assignment — Non-maskable interrupt input. The interrupt routine is executed at the trailing edge of this signal. This pin is invalid because it is tied to ground. —...
  • Page 45 REV.-B Table 2-3. CPU Port Assignment (cent’d) Port Signal Line Description Name Number Memory write timing strobe signal. Connected to the WR strobe terminal of the gate array and the write enable terminal of the RAM. Address latch enable signal. Controls address latching per- formed inside the gate array (enables latching when the signal is HIGH).

  • Page 46: E05A03 Gate Array Functions

    2.4.2 E05A03 Gate Array Functions This section describes the E05A03 functions. Figure 2-12 shows the E05A03 block diagram. STROBE REGISTER LATCH I NO-7 DBO-7 PRINTHEAD DRIVER I I I I I ~’ I I II CARRIAGE MOTOR DRIVER BUSY RESO RESET Fig.

  • Page 47: Initialization

    Functions of the E05A03 gate array (IC3B) are as follows: 1. Address latch The gate array latches data on address data lines and outputs it to ABO - AB7 (when ALE is high, the data is passed through without latching.) 2.
  • Page 48 REV.-A Table 2-4 shows the E05A03 functions and Table 2-5 shows the E05A03 pin functions. Table 2-4. E05A03 Functions Function Name R / W Lower Address Reads the data which was latched using STROBE, and resets the STROBE-BUSY output. Writes data to the upper eight bits of the 24-bit shift register —...
  • Page 49 Table 2-5. E05A03 Port Assignments Description Direction Signal Pin No. Power (+ 5V DC) o u t Paper end lamp (~/off) PE LP Carriage (CR) motor phase D drive pulse CR D CR motor phase C drive pulse CR C CR motor phase B drive pulse CR B CR motor phase A drive pulse...
  • Page 50 REV.-A 2 . 4 . 3 D a t a F l o w This section describes the firmware start-up operation when the printer is initialized, data flow Figure 2-13 shows a memory map of the (especially printing data flow), and command processing. LX-800.
  • Page 51 REV.-A 2.4.3.1 Initialization When the reset signal is input, the printer is initialized as follows: GATE ARRAY Clears the ports using hardware resetting. Sets the print head data to High-Z(the high Clears all port outputs. Executes the program from t impedance state).

  • Page 52: Print Data Processing

    REV.-A 2.4.3.2 Print Data Processing After the initialization, the CPU enters the data waiting state. When data is input from the interface, the CPU starts reading the data. Besides this process (main routine), the actual printing process is performed by an interrupt routine. The print data is processed by repeating the main and interrupt routines.
  • Page 53 (1 6 bits), for attributes 1 and 2, for each character. The command flags indicate what kind of command or mode is specified for the character. According to the command flags, any of the EPSON ESC/P commands, NLQ, underline, emphasized character, and font selection, is specified for the character.

  • Page 54: Reset Circuit

    REV.-A 2.4.4 Reset Circuit A reset operation is performed when the INIT signal is input from the interface and when the printer power is turned on. (Refer to Sections 1.4.6, 2.4.1, 2.4.2, and 2.4.3.1 for the reset operation.) Figure 2-17 shows the reset circuit. + 2 4 HZS1 5-3 ~ - - - -...

  • Page 55: Carriage Motor

    REV.-A 2 . 4 . 5 C a r r i a g e M o t o r This section describes the sensor circuit, an outline of the firmware, and the drive circuit, which are used to control the carriage motor. The specifications of the carriage motor are as follows: 7.5°...

  • Page 56: Carriage Motor Control

    REV.-A 2.4.5.2 Carriage Motor Control The carriage motor control system is an open-loop system. There are two basic phase switching speeds: 450 PPS (l-1 phase drive) and 900 PPS (2-2 phase drive), as shown below. The phase switching is performed according to the time data (time required to switch a phase) which is determined by the firmware, for the number of counts determined by the firmware.
  • Page 57 REV.-A Figure 2-20 shows the basic sequence for the carriage operation. C. H.P.S. (Refer to Section 2.4.5.3) When the printer is initialized, a carriage home position seek is performed. Then the carriage motor enters the holding mode at the operation start position (START). At least 6 ms of rush time (Rt) is set just before acceleration and after deceleration to stabilize the motor operation.

  • Page 58: Home Position Seek

    REV.-A 2.4.5.3 Home Position Seek Figure 2-21 shows the home position seek operation (actual carriage movement) Held for 20 to 30 ms according to the phase data combination. Moves from left to right until it leaves the home position. Moves from right to left for four steps, then stops.

  • Page 59: Carriage Motor Drive Circuit

    REV.-A 2.4.5.3 Carriage Motor Drive Circuit Figure 2-22 shows the carriage motor drive circuit. — 3.3Kx4 ‘ (3B) + 2 4 3.3K (2B) EMO1 ZW Fig. 2-22 Carriage Motor Drive Circuit The carriage motor drive circuit is a constant voltage switching circuit (unipolar drive). When output CR of the E05A03 is HIGH, the voltage is applied to the coil of the motor.

  • Page 60: Paper End Sensor

    REV.-B 2.4.6.1 Paper End Sensor The paper end sensor detects whether paper is present or not. Figure 2-23 shows the paper end sensor circuit. 5.6K (26) Fig. 2-23. Paper End Sensor Circuit When the paper runs out (of the detection area), the reed switch closes, and port PA5 of the CPU goes LOW.

  • Page 61: Paper Feed Motor Control

    REV.-A 2.4.6.2 Paper Feed Motor Control The paper feed motor is controlled by an open-loop system just like the carriage motor. The basic phase switching speed is 480 PPS (2-2 phase drive), and the phase switching is performed according to the phase pattern stored in the firmware.

  • Page 62: Auto Loading Function

    2. The printer drives the paper feed motor for 433 steps to load the paper. In this way, the printing start position is set approximately 22 mm from the top of the paper. Approx. 22mm EPSON LX-800 Fig. 2-27. Printing Start Position 2-30...

  • Page 63: Paper Feed Motor Drive Circuit

    REV.-A The auto loading function is valid under the following conditions: When the printer is OFF LINE. Just after the signal from the paper end sensor changes from LOW to HIGH. (The leading edge of the signal is checked for.) 2.4.6.4 Paper Feed Motor Drive Circuit Figure 2-28 shows the paper feed motor drive circuit.

  • Page 64: Printhead

    REV.-A 2 . 4 . 7 Printhead This section gives an outline of the software that controls the printhead, the drive pulse width control, and the drive circuit. The specifications of the printhead are as follows: : Nine Number of solenoids : +24 VDC Drive voltage : 19.2 ohms +10%...

  • Page 65: Printhead Drive Pulse Width Control Circuit

    2.4.7.2 Printhead Drive Pulse Width Control Circuit In order to keep the value of the printhead drive pulse width constant, the CpU monitors the +24 VDC line, the printhead common voltage, and uses the voltage level to adjust the width of the FIRE signal. The printhead drive pulse width is controlled to be within the area shown by the oblique lines in Figure 350 ;...

  • Page 66: Printhead Drive Circuit

    2.4.7.3 Printhead Drive Circuit Figures 2-32 and 2-33 show the printhead drive circuit and the waveform of the drive voltage. Solenoid Coil E05A03 (3B) Fig. 2-32. Printhead Drive Circuit Waveform Drive Transistor Collector Voltage Waveform C=approx. 1.11 ms Fig. 2-33. Voltage Waveforms Solenoid Current and Drive 2.4.8 Print Timing Control...
  • Page 67 FIRE 00 ..Fig. 2-34. The Relationship Between the Carriage and Printhead Control Signals Figure 2-34 shows the relationship between the carriage and the printhead when character “~” is printed in the Draft mode. The dot data of HD 1 through HD8 and HD9 synchronizes with the LOW level of ~.
  • Page 68 1 1-12: Printing of the 3’rd line Fig. 2-35. Logic Seeking Upon receive in print data “EPSON” for a line from the host computer, the printing is performed in an action of @ to @ with the carriage and printhead moving to position Q.

  • Page 69: Printer Mechanism Operation

    REV.-A 2.5 PRINTER MECHANISM OPERATION The printer mechanism includes sensors, the carriage, the paper feed, and the ribbon feed mechanism. Figure 2-36 shows an external view of the printer mechanism. Fig. 2-36. Printer Mechanism External View (Model-3A10) 2.5.1 Sensor Mechanism home position sensor and paper end sensor.
  • Page 70 REV.-B 2 . 5 . 2 C a r r i a g e M e c h a n i s m The carriage mechanism includes the printhead, the carriage, the timing belt, the carriage motor, and the platen. Fig. 2-37 shows the carriage mechanism. The timing belt is connected into the bottom of the carriage.
  • Page 71 REV.-B The dot wire operation during printing is as follows: when the head driving coil for a dot wire is energized, the actuating plate engaged with the dot wire at one end is attracted to the iron core and drives the dot wire toward the platen. The dot wire strikes the ribbon and the paper against the platen to print a dot in the paper.
  • Page 72 REV.-B 2 . 5 . 3 P a p e r F e e d M e c h a n i s m The paper feed mechanism operates by friction feed method for cut sheets, and roll paper, and by the sprocket feed method for fanfold paper.
  • Page 73 REV.-B 2.5.3.2 Sprocket Feed Operation When the printer is using the sprocket feed method, the holes in the paper are set over the sprocket pins along the sprocket wheel. The paper feed motor is driven to rotate the gears, via the pinion on the shaft of the motor, in the direction shown in Figure 2-40.
  • Page 74 REV.-B 2 . 5 . 4 Ribbon F e e d M e c h a n i s m section. A ribbon The ribbon feed mechanism consists of the ribbon cartridge and the ribbon feed irrespective of the turns counterclockwise, via the geartrains shown in Table 2-6, direction of the timing belt.
  • Page 75 CHAPTER 3 OPTIONAL EQUIPMENT 3.1 GENERAL ..................... . 3-1 3.2 OPTIONAL INTERFACES .

  • Page 76: Optional Interfaces

    REV.-A 3.1 GENERAL This chapter describes the options available for the LX-800. 3.2 OPTIONAL INTERFACES The LX-800 use the 8100 series optional interfaces. The optional interfaces are listed in Table 3-1. Table 3-1. Optional Interfaces Cat No. Description RS-232C X-ON/OFF Max.
  • Page 77 REV.-A CHAPTER ISASSEMBLY, ASSEMBLY, AND ADJUSTMENT GENERAL REPAIR INFORMATION ..........4 -1 DISASSEMBLY AND ASSEMBLY .
  • Page 78 LIST OF FIGURES Printhead Removal ..............4-3 Fig.
  • Page 79 REV.-A LIST OF TABLES Table 4-1. Repair Tools ..................4-1 Table 4-2.

  • Page 80: General Repair Information

    Phillips screwdriver No. 2 B743800200 Screwdriver No. O B743800300 Thickness gauge (0.47 NOTES: 1. The tool marked is used when attaching the E-ring (2.3 mm). 2.0 = Commercially available tool EPSON exclusive tool Table 4-2. Measuring instruments Description Specification Class Oscilloscope 50 MHz...
  • Page 81 All small parts are described by abbreviations. Table 4-3. Abbreviations List of Small Parts Abbreviation Part Name Cup Screw Cross-recessed head machine screw (Pan head) CP (P) CPSP Cross-recessed head machine screw Spring washer — and Plain washer assemblies (Pan head) Cross-recessed head Tapping screw (Cup screw) Cross-recessed head Tapping screw (Bind) CTBS (0)

  • Page 82: Disassembly And Assembly

    4.2 DISASSEMBLY AND ASSEMBLY of the LX-800. Assembly can be performed by simply reversing This chapter describes disassembly the order of disassembly, with special notes for assembly mentioned as “ASSEMBLY POINTS.” For assembly and disassembly procedures which require adjustment, the necessary adjustment is indicated as “ADJUSTMENT REQUIRED.”...

  • Page 83: Removal Of Cases

    REV.-A 4.2.2 Removal of Cases This section describes the upper case and control panel (LCPNL) removal. 4.2.2.1 Upper Case Removal (Figures 4-2 through 4-3) Remove the sheet guide unit, printer cover, tractor unit, and paper guide. Insert a standard screwdriver into the two holes at the front of the lower case, unlock the notches, then lift the upper case.

  • Page 84: Removal Of Electric Circuit Boards

    REV.-A 4.2.2.2 Control Panel (LCPNL Board) Removal (Figure 4-4) 1. Remove the upper case. (Refer to Section 4.2.2.1) 2. Turn the upper case over, push the two notches securing the control panel to the upper case inward, and remove the control panel from the upper case. W A R N I N G When mounting and removing the control panel, be careful not to damage the FPC of the control panel with the FPC guide of the upper case.

  • Page 85: Roc Filter Unit Removal

    REV.-A Fig. 4-5. ROCX Board Removal 3. Remove the C.T.C. screws (M3 x 6) securing the ROCX board to the base plate. 4. Loosen the six bent tabs of the lower case, which secure the ROCX board to the lower case, using a screwdriver, and remove the ROCX board.

  • Page 86: Removal Of Platen Unit And Paper Guide

    REV.-A 3. Remove the five screws securing the ROC filter unit to the base plate. The screws are as follows: 1 X C.B.O. (M4 X 8) 1 X C. T. B.S.(O) (M4 X 8) 2 X C.T.B. (M4 X 14 X C.
  • Page 87 3. Disconnect the cable from connector CN6 on the ROCX board. 4. Unlock the two notches of the paper guide by pushing them frontward from the back side of the printer mechanism, and remove the paper guide. Fig. 4-9. Printer Mechanism Rear View ADJUSTMENT REQUIRED If any problems occur (such as non-uniform print density) after removing and installing the platen unit or replacing the platen unit with a new one, perform the following adjustment.

  • Page 88: Disassembly Of Printer Mechanism

    REV.-A a. Loosen tabs @) and @, and lift the left side of the frame 1 cm from the lower case. more cm from the lower case. Loosen tab @ and lift the left side of the frame 5 c. Slide the printer mechanism in the direction shown by the arrow in Figure 4-10 to remove it from tabs @ and @.
  • Page 89 REV.-A 4. Push the paper feed roller shaft down, slide it approximately 2 cm to the left, and lift it to remove Frame Fig. 4-13. Removal of Paper Feed Roller Shaft 5. Loosen the four tabs securing the paper guide plate and the paper guide plate spacer to the frame, using a screwdriver, and lift them to remove them.
  • Page 90 ASSEMBLING POINTS: 1. When reassembling the paper guide plate and the paper guide spacer, refer to Figure 4-15 for the mounting direction. I . \ \ F o r w a r d + - side containing the cutout is the right side.

  • Page 91: Removal Of Paper Feed Motor

    REV.-A 4.2.5.2 Removal of Paper Feed Motor (Figure 4-17) 1. Remove the printer mechanism. (Refer to Section 4.2.4) 2. Disconnect the motor cable from the paper feed motor. 3. Loosen the tab of the frame, which secures the paper feed motor to the frame, by pushing it using a screwdriver, and remove the paper feed motor by turning it in the direction shown by the arrow below, using point A as a fulcrum.

  • Page 92: Disassembly Of Platen Unit

    4.2.5.4 Disassembly of Platen Unit (Figure 4-19) 1. Remove the platen unit. (Refer to Section 4.2.4.1) 2. Remove the left shaft holder and the paper feed knob from the platen unit. 3. Pull out the platen gear at the right side of the platen unit. 4.
  • Page 93 REV.-A 4. Detach the timing belt from the carriage unit using round nose pliers. Be careful not to damage it. 5. Lift portion A of the carriage guide shaft ground plate to remove it from the notch in the carriage frame (through the cutout at motor frame, and slide the plate so that it can be removed from the...
  • Page 94 REV.-A the carriage guide plate to the frame, and slide the Push the notch of the frame, which secures carriage quide plate to the left to remove it. Plate —. Fig. 4-23. Removal of Carriage Guide Plate Lift the carriage unit, carriage guide shaft, and head adjust lever to remove them. ASSEMBLING POINTS: 1.

  • Page 95: Removal Of Carriage Motor

    REV.-A 4.2.5.6 Removal of Carriage Motor (Figures 4-25 through 4-26) 1. Perform steps 1 to 5 of Section 4.2.5.5. 2. Disconnect the motor cable from the carriage motor. Disconnect the lead wire of the home position sensor from the molded clip at the bottom of the frame. (Refer to Figure 4/-25.) 3.

  • Page 96: Removal Of Home Position Sensor

    REV.-B ASSEMBLY POINT: Attach the E-rings as follows: When attaching a ring to the left pulley shaft, set it so that its opening faces to the left. . When attaching a ring to the right pulley shaft, set it so that its opening faces to the right. using the tweezers.

  • Page 97: Disassembly Of Tractor Unit

    REV.-A 4.2.5.9 Disassembly of Tractor Unit (Figures 4-29 through 4-32) Loosen the three tabs of the sprocket mounting plate using a screwdriver and remove the side cover. (Both the left and right side covers can be removed at the same time.) Push Sprocket Mounting...
  • Page 98 REV.-B Pull out the sprocket assembly and the paper guide roller from the sprocket shaft and the sprocket guide shaft. When pulling out the paper guide roller, move it along the sprocket shaft toward the side with the T-shaped notch. (When assembling the paper guide roller, insert the sprocket shaft from the side with the T-shaped notch.) Sprocket Shaft Guide Roller’...

  • Page 99: Platen Gap Adjustment

    4.3 ADJUSTMENT This section describes the adjustment procedures required for reassembling the LX-800 printer. When disassembly or replacement is performed during maintenance or repairs of the parts described in this adjustments should be performed to ensure proper operation. section, the following 4-33 through 4-36) Adjustment (Figures 4 .
  • Page 100 REV.-A 0.47 * 0.02 mm Printhead Platen Fig. 4-34. Platen Gap t Lever Frame (Left side) Carriage Guide Shaft Lever (Left) Fig. 4-35. Carriage Guide Shaft Lever Movement Carriage guide shaft (left): Turned clockwise - The platen gap widens. Turned counterclockwise - The platen gap narrows. Carriage guide shaft (right): Turned clockwise - The platen gap narrows.

  • Page 101: Troubleshooting

    REV.-A CHAPTER 5 TROUBLESHOOTING GENERAL ....................5-1 REPLACEMENT .
  • Page 102 REV.-B 5.1 GENERAL The difficulty in troubleshooting is that error symptoms vary, depending on the defective component. process shown in Figure However, troubleshooting may be accomplished more easily by following the 5-1. This flowchart shows the two levels of repair: one is unit replacement, in which the defective subassembly is identified and replaced;...
  • Page 103 REV.-B For troubleshooting, repair tools are listed in Tables 4-1 and 4-2. In addition, EPSON has prepared the following specified tools to increase the work efficiency and safety: Fig. 5-2. Special Tools for LX-800 Table 5-1. Special Tools for LX-800 Part No.

  • Page 104: Unit Replacement

    5.2 UNIT REPLACEMENT The unit replacement procedure is based on symptom analysis. According to the particular symptom found by the multimeter, the units listed in Table 5-2 need to be replaced. Table 5-2. List of Units Unit Code No. Description Unit Name X50206 1050 125V/1 .25A (for 120V)
  • Page 105 REV.-A (1) Printer does not operate when power switch is on. 1 on the ROC Filte Measure the output voltage from ROC Filter unit. Refer to Table 2-2. Replace the ROC Filter unit. Replace the printer mechanism.
  • Page 106 (2) The carriage does not operate correctly. connectors CN4, CN5, CN6 and CN7, connecting the ROCX board and the printer mechanism, inserted securel connectors. — Replace the printer mechanism.
  • Page 107 REV.-B (3) The carriage operates normally, but the self-test printing is incorrect. Set the gap-adjustment lever at the side nearest the platen ‘the printer mechanism and the ROCX board- Measure the printhead resistance. See Figure Reinsert them 5-3. <Page 5-10> correctly.
  • Page 108 (4) The self-test printing is normal, but the paper is not fed START Set the paper correctly. Replace the printer mechanism. turned manually with Replace the printer mechanism. Replace the ROCX board.
  • Page 109 (5) The control panel does not operates correctly. START Reinsert connector CN3 panel and the ROCX board Replace the ROCX circuit board. Replace the control panel. Replace the control panel. Replace the ROCX circuit board..
  • Page 110 (6) The printing is incorrect in the ON-LINE mode. NOTE: It is assumed that the host computer operates normally. START Perform test printing. Refer to other troubleshoot- ing items. — interface board Replace the optional interface board. Standard Parallel Replace the connection cable from the host com- puter.
  • Page 111 REV.-A ( Wire assignment) Coil Resistance: 19.2 & 1.9 Q at 25°C (Between each dot wire and common.) (Terminal assignment ) Fig. 5-3. Printhead Resistance 5-1o...
  • Page 112 REV.-A 5.3 UNIT REPAIR This section indicates possible causes and checkpoints for different symptoms. The checkpoints include waveforms and resistance values for normal operation. By referring to the checkpoints, determine the detective component and perform the proper repair. Tables 5-5 and 5-7 have the following five columns: Identify the problems listed in this column.
  • Page 113 REV.-A Table 5-5. ROCX Board Unit Repair Solution Checkpoint Cause Symptom Problem Replace F1. Check fuse (Fl) on the The printer does The +24V DC defective. line is dead. not operate at all. (The power lamp Replace the ROC Measure the output volt- on the control filter unit.
  • Page 114 REV.-A Table 5-5. ROCX Board Unit Repair (Cent’d) Cause Checkpoint Solution Problem Symptom The printer does Buzzer rigns 5 Home position Check the level of IC3B Replace Gate ar- Pin 23. ray (3 B). not operate. (The times. sensor is defective.
  • Page 115 REV.-A 5.3.2 Printer Mechanism If trouble occurs with the printer mechanism, troubleshoot it as described in Table 5-7. Refer to sections 4.2 Disassembly and Assembly and 4.3 Adjustment for replacement and adjustment of parts. If the same problem or symptom persists, check other items in the cause column and try again. Table 5-6 lists the recommended parts to keep in stock for repairing the printer mechanism.
  • Page 116 REV.-A Table 5-7. Printer Mechanism Unit Repair Checkpoint Solution Cause Problem Symptom Remove any fore- Foreign substances Move the timing belt The carriage Carriage motor ign substances. manually and check if are lodged in the motor does not does not operate. the carriage motor gears or operate at all at...
  • Page 117 Table 5-7. Printer Mechanism Unit Repair (cent’d) Solution Checkpoint Cause Symptom Problem Reset the ribbon The ribbon car- Check that the ribbon A specific dot is Printing is cartridge. cartridge is installed not printed. tridge is installed abnormal. correctly. incorrectly. Replace the Check the continuity of The printhead is...
  • Page 118 Table 5-7. Printer Mechanism Unit Repair (cent’d) Checkpoint Solution Cause Symptom Problem Verify that the switch Replace the pa- The paper end Paper does not Sheet load- clicks when the paper per end sensor. ing mecha- sensor is feed correctly. end sensor lever is defective.
  • Page 119 Table 5-7. Printer Mechanism Unit Repair (cent’d) Checkpoint Solution Problem Symptom The ribbon Replace the rib- Ribbon feed is feed The ribbon slips Verify that the ribbon is bon cartridge. fed when the ribbon car- inside the ribbon defective. quantity is not tridge is dismounted and uniform.

  • Page 120: List Of Tables

    REV.-A CHAPTER 6 MAINTENANCE 6.1 PREVENTIVE MAINTENANCE ............. . . 6-1 6.2 LUBRICATION AND ADHESIVE APPLICATION .

  • Page 121: Preventive Maintenance

    6.2 LUBRICATION AND ADHESIVE APPLICATION EPSON recommends that the points illustrated in Figure 6-2 be lubricated at the points listed in Table (Refer to Table 6-1 for details about O-2 and G-27.) Be sure that the parts to be lubricated are clean before applying lubricant, and avoid excessive application, which may damage related parts.
  • Page 122 REV.-A Table 6-2. Lubrication Points (Refer to Figure 6-2) Lubrication Points Ref. No. Carriage guide shaft. (On the both left and right sides of carriage.) Carriage guide plate. (Contact portion with the carriage. 50 mm G-27 (L) X 2 mm (W)) Platen gear.
  • Page 123 REV.-A Fig. 6-2. LX-800 Lubrication Points...
  • Page 124 APPENDIX LIST OF FIGURES Fig. A-1. Fig. A-2. 1.LPD7810/7811 Block Diagram ..........A -3 OP Code Fetch Timing .
  • Page 125 REV.-A LIST OF TABLES Primary ICS on the ROCX Board ........A-1 Table A-1.
  • Page 126 A.1 PRINCIPAL IC SPECIFICATIONS This chapter describes the principal ICS used in LX-800. The ICS are shown in Table A-1. Table A-1. Primary ICS on the ROCX Board Part Code No. Location X400078 101 pPD7810HG Y448800001 E05A03 X4001 43644 X 4 4 0 0 6 4 9 4 0 7407 X4201 OOO7O 1 c, 2C...
  • Page 127 REV.-B The 7810 (78 11 ) HG has the following differences from the conventional G type. (a) Driving oscillation frequency is guaranteed up to 15 MHz. (b) Reference voltage AVref (A/D converter reference voltage) is different. For point (b), the multiplier for the AVref terminal’s peripheral circuit is different. Therefore, a board with the HG type can use only HG type replacement parts.
  • Page 128 < Z — Fig. A-2. wPD7810/7811 Block Diagram...
  • Page 129 REV.-A Table A-2. PPD781O Mode Setting memory External Mode 1 Mode O 4K Byte Addresses O to OFFFH 16K Byte Addresses O to 3FFFH 1 (Note) 1 (Note) 1 (Note) NOTE: Pull-up is made. Table A-3. KPD7811 PF Operation External Memory Port 256 Bytes (max.) Port...
  • Page 130 REV.-A Table A-5. APD7810/7811 Port Functions Description Direction Signal P A O - 7 In/Out 1 - 8 (MA) register. Output HIGH. PBO - 7 In/Out register (MB). Output HIGH. Port C. Eight-bit l/O with output latch. Port/control mode can be Pco - 7 In/Out 1 7 - 2 4...
  • Page 131 . CPU Timing (Figures A-3 through A-5) Three oscillations define one state. The OP code fetch requires four states: during T1 to T3, program memory is read; instructions are interpreted during T4. Address bus lines 15 - 8 are output from TI to T4.
  • Page 132 A.1.2 E05A03BA (E05A03CA) Gate Array The E05A03BA gate array intergrates many CPU peripheral functions, so that fewer chips are required to construct a complete system. Figure A-6 shows the E05A03BA pin diagram, and Figure A-7 shows the E05A03BA block diagram. The details of the E05A03BA are given in section 2.4.2. –...
  • Page 133 Lower Address Decode Signal Address ALE ~ CR Motor Latch PF Motor Address/Data Bus Driver D a t a Latch AD 13 Decoder Printhead Driver Lamp Driver Parallel l/F Fig. A-7. E05A03BA (E05A03CA) Block Diagram...

  • Page 134: Features

    REV.-A The 2064C is a 8K-byte CMOS static RAM. The 2064C has low power consumption, and its input/output level is compatible with the ITL ICS. Figure A-8 shows the 2064C pin diagram, and Figure A-9 shows a block diagram for the 2064C static RAM. Features Capacity of 8192 words X 8 bits .
  • Page 135 REV.-A A.1.4 494 Regulator IC The 494 regulator IC is described in Figures A-10 and A-1 1 and Table A-7. , CONTROL , - - - - (1 L495 ONLY) F E E D O E A O INPUT BACK TIME CONTROL INPuT Fig.
  • Page 136 T E S T I N P U T S - F E E D s A C K VOLTAGE AT Cl VOLTAGE A TC2 VOLTAGE ATCT D E A D - T I M E Tt:REsHoLO VOLr~E -- CONTROL IN PUT v O L T A G E - - FEEO BACK j...
  • Page 137 REV.-A A . 1 . 5 7 4 0 7 The 7407 has hex open-collector buffers as shown in Figure A-12. Fig. A-1 2. 7407 Pin Diagram...
  • Page 138 A.2 SCHEMATICS AND DIAGRAMS Fig. A-1 3. LCPNL Circuit Diagram A-1 3...
  • Page 139 ’ 3 4 ’ 3 5 ’ 3 7 Fig, A-15, ROCX Board Component Layout A-1 7...
  • Page 140 REV.-B Table A-16. Part No. Referenca Table Description Description Ref. No. Ref. No. RETAINING RING TYPE-E (2.3) LOWER CASE ASSEMBLY CARRIAGE UNIT BASE PLATE 4 2 6 HEAD GROUND PLATE RUBBER FOOT HEAD LOCK LEVER SPRING INSULATOR LOCK LEVER (LEFT) HEAD GROUND PLATE HEAD LOCK LEVER (RIGHT)
  • Page 141 EPSON SEIKO EPSON CORPORATION BUSINESS & INDUSTRIAL INSTRUMENT DIVISION EPSON OVERSEAS MARKETING LOCATIONS EPSON AMERICA, INC. EPSON DEUTSCHLAND GmbH 2780 Lomita Blvd., Torrance, Calif. 90505, U.SA. Phone: (213) 539-9140 Phone: (021 1) 56030 Telex: 182412 Telex: 8584786 EPSON FRANCE S. A.
  • Page 142 87.07 -.6...

Table of Contents