Epson LX-810 Technical Manual
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Epson LX-810 Technical Manual

Epson LX-810 Technical Manual

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L X - 8 1 0 / 8 5 0

TECHNICAL MANUAL

EPSON

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  • Page 1: Technical Manual

    L X - 8 1 0 / 8 5 0 TECHNICAL MANUAL EPSON...
  • 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. 9 Copyright 1989 by SEIKO EPSON CORPORATION...
  • Page 3 THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS. WARNING REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN. 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 product disassembly, assembly, and adjustment. Provides Epson-approved techniques for troubleshooting. C h a p t e r 5 - Describes preventive maintenance techniques and lists C h a p t e r 6 - lubricants and adhesives required to service the equipment.
  • Page 5 REVISION TABLE REVISION DATE ISSUED CHANGE DOCUMENT I A IMar 1989 1st issue -...,,.; ..
  • Page 6 REV.-A TABLE OF CONTENTS GENERAL DESCRIPTION CHAPTER 1. CHAPTER 2. OPERATING PRINCIPLES CHAPTER 3. OPTIONAL EQUIPMENTS CHAPTER 4. DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT TROUBLESHOOTING CHAPTER 5. MAINTENANCE CHAPTER 6. APPENDIX...

  • Page 7: Table Of Contents

    REV.-A CHAPTER 1 GENERAL DESCRIPTION FEATURES ...................
  • Page 8 REV.-A Lever Position ................1-21 Figure 1-9.

  • Page 9: Features

    Easy handling of cut sheets with the optional cut-sheet feeder (CSF) LX-8 10/850 is equipped with the standard EPSON 8-bit parallel interface. Various interface options enable users to print data from a variety of computers. Table 1-1 lists the interface options, Table 1-2 lists the optional units available for the LX-8 10/850, and Figure 1-1 shows an exterior view of the LX-8 10/850.

  • Page 10: Figure 1-1. Exterior View Of The Lx-810/850

    REV.-A Figure 1-1. Exterior View of the LX-81 0/850 , . . ’...

  • Page 11: Hardware Specifications

    REV.-A S P E C I F I C A T I O N S prinlter specifications. This section describes LX-8 10/850 Hardware Specifications 1.2.1 Printing Method Serial, impact, dot matrix Pin Configuration 9 wires (diameter 0.29mm) 0.29mm < > /72”) 0.35mm (1 <...

  • Page 12: Table 1-3. Cut-Sheet Specifications

    REV.-A a. Push Tractor Feed 1. Use the pull-out unit. 2. Do not perform reverse feeding greater than 1/6 inch. 3. After paper end detection, accuracy of paper feed cannot be assured and reverse feeding cannot be performed. b. Push Pull Feed 1.

  • Page 13: Table 1-6. Envelope Specifications

    REV.-A Table 1-6. Envelope Specifications No.6 (166 Imm x mm), No. 10 (240 mm x 104 mm) Size Quality Bond paper, Plain paper, Air mail 0.52 Thickness 0.16 mm to mm (0.0063 in. to 0.0197 in.) Difference of thickness within printing area must be less than 0.25 rnm (0.0098 in.).

  • Page 14: Figure 1-3. Cut-Sheet Printing Area

    REV.-A Printing Area . . . below show the printing area for cut sheets. The figures 182-257 mm(7. 2-10.1 “ ) *1 ) *1 ) Printable area 8.5rnrY 0.33 “ or mt “e — — ““ 3../ 3 6 4 m m m a x .

  • Page 15: Figure 1-4. Printing Area For Continuous Paper

    REV.-A -10.0 “ ,101 mm-254mm 4.0 “ I * 2 ) Printable area Printable area )(YZ 9mm,0.35 “ or more 0 - - 0 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9mm,0.35 “...
  • Page 16 REV.-A 2‘1 6mm(8.5 “)* 3mm(0. 12 “ ) 3 r n m 3 m m m i n . m i n . 2 0 3 . 2 m m ‘ 1 (printable area) — m i n AEIC — Figure 1-3.
  • Page 17 REV.-A Electrical Specifications Power Conditions 120 VAC & 10% (120V version) 2 2 0 / 2 4 0 VAC + 10% (220/240V v e r s i o n ) Frequency Range 49.5 to 60.!5 Hz 28W (Draft self-test) Power Consumption 10 Mgohms min.

  • Page 18: Firmware Specifications (Esc/P)

    REV.-A Firmware Specifications (ESC/P) 1.2.2 ESWPTM level ESC/P-81 Control Code (EPSON Standard Code for Printers) Bi-directional printing with logic seeking (text) Printing Direction Uni-directional (left to right) printing (Bit-image) 4 K bytes Input data buffer 96 ASCII characters Character Set...
  • Page 19 REV.-A Printing Columns See Table 1-10 1-10. Column Width (maximum characters/line) Table Type of Letters Column Width (CPL) Column/inch (cpi) Pica Elite Condensed Double-Width Pica Double-Width emphasized Double-Width Elite Double-Width Condensed Condensed Elite Emphasized 1-11...

  • Page 20: Figure 1-6. Data Transmission Timing

    REV.-A 1.3 INTERFACE OVERVIEW The standard 8-bit parallel interface provided with this printer meets the specifications described below. 8-bit parallel Data Format By STROBE pulse Synchronization By BUSY and ACKNLG signal Handshaking Signal Level TTL-compatible Adaptable Connector 57-30360 (amphanol) or equivalent Data Transmission Timing See Figure 1-6 BUSY ,/,,...
  • Page 21 REV.-A Table 1-11. Connector Pin Assignments and Signal Functions (Cont.) Functional Description Pin No. Signal Name Return Pin No. — AUTOFEED-XT if “LOW” when the printer is initialized, a line feed is automatically performed by input of “CR” code. (Auto Not used Ground for twisted-pair grounding —...

  • Page 22: Table 1-12. Printer Select/Deselect Control

    REV.-A T a b l e 1 - 1 2 s h o w s P r i n t e r S e l e c t / D e s e l e c t (DC l/DC3) controL including relations amon9 ON-LINE, . . SELECT-IN input, DC l/DC3 and interface signals.

  • Page 23: Dip Switch Settings

    1.4 DIP SWITCH AND JUNIPER SETTINGS This section describes DIP switch settings for the LX-8 10/850 printer. 1.4.1 DIP Switch Settings The two DIP switches are located on the side of the printer and function as shown in Tables 1-13 through 1-15.

  • Page 24: Sheet Loading And Sheet Ejection

    REV.-A SELECTYPE F U N C T I O N SelecType allows the user to choose fonts and the printing mode easily. This function provides for selection of Draft, Roman, or Saris Serif fonts and selection of normal printing or condensed printing modes.

  • Page 25: Tear-Off Function

    REV.-A T E A R - O F F FUNCTION The Tear-Off function can be enabled by making the appropriate DIP switch setting, and will operate if the input when the release-lever is set to the tractor position. In such a case, data buffer is empty and the printer is ON-LINIE, the paper will automatically be fed to the tear-off position, and the ON-LINE LED will flash to indicate that the FORM FEED and LINE FEED switches are now available to perform...

  • Page 26: Operating Instructions

    REV.-A 1.8 OPERATING INSTRUCTIONS functions, error states, printer initialization, and This section describes the self-test, hexadecimal d u m p buzzer operation. 1.8.1 Self-Test begin printing the self-test in the Draft mode, turn the printer ON while pressing the LIN E-FEED button. begin printing the self-test using the hlLQ press FORM FEED and hold mode (Near Letter Quality),...

  • Page 27: Hexadecimal Dump Function

    REV.-A 1.8.2 Hexadecimal Dump Function and FORM-FEED on while the LINE-FEED The printer enters the HEX-DUMP mode when it is powered buttons are pressed down. In the HEX-DUMP mode, the hexadecimal representation of input data is printed out, along with corresponding ASCII characters.

  • Page 28: Buzzer Operation

    REV.-A 1.8.3 Buzzer Operation The buzzer sounds under the following conditions: The buzzer sounds for 0.1 second when a BEL code is input. BEL code: Beeps 6 times, pausing briefly after 3rd beep. Carriage trouble: Beeps 20 times, pausing briefly after every 4 beeps. Paper-out: Beeps 5 times, pausing after every beep.

  • Page 29: Printer Initialization

    REV.-A 1.8.4 Printer Initialization The printer is initialized when: 1 ) AC power is turned on 2) The INIT signal is input Here is a brief summary of the initialization sequence. Return the printhead to the Ieftmclst position. Set ON LINE mode. Clear the print buffer and input buffer.

  • Page 30: Main Components

    REV.-A 1.6 M A I N C O M P O N E N T S The main components of the LX-8 10/850 printer are designed for easy removal and replacement to maintain/repair the printer. The main components are: 1 ) TAMA board: Main control board. The CPU on this board controls all main functions. 2) TAPNL-W control panel: Control panel.

  • Page 31: Tapnl-W Control Panel

    REV.-A 1.6.1 TAMA Board The use of the ~PD78 10HG CPU simplifies the main control board circuit design. . PROM (3C) -SRAM (3D) Gate Array E05430 (3B) - CPU LPD78 10HG (2C) Figure 1-II 1. TAMA Main Control Board 1.6.2 TAPNL-W Control Panel The TAPNL-W control panel is the LX-8 10/850 control panel which contains the indicator LEDs and switches.

  • Page 32: Ta Filter Unit

    REV.-A 1.6.3 TA Filter Unit The TA filter unit contains a power cord ( 120V Version) or AC inlet (220/240V Version), power switch fuse, filter circuit, and power transformer. (240V Version) (220V Version) (120V Version) Figure 1-13. TA Filter Unit 1.6.4 Printer Mechanism (M-3D1O) The M-3D 10 printer mechanism was developed specifically for the LX-8 10/850 printer.
  • Page 33 REV.-A 1.6.5 Housing The LX-8 10/850 housing consists of the upper and lower cases. The upper case houses the control panel. The lower case houses the printer mechanism and the main control board. f:igure 1-15. Housing 1-25...

  • Page 34: Principles Of Operation

    REV.-A CHAPTER 2 PRINCIPLES OF OPERATION OVERVIEW ................... . . 2.1.1 Connector Summary .
  • Page 35 REV.-A 2.2.5.5 Printhead Drive Circuit ........2-41 2.2.5.6 Printhead Software Control .

  • Page 36: List Of Tables

    REV.-A Home-PositionSeak ............. . 2-33 Figure 2-36.

  • Page 37: Overview

    REV.-A 2.1 O V E R V I E W This chapter describes the signals at the connectors linking the primary components of the LX-8 10/850. These components include the printer mechanism and control circuits. The chapter also describes the operation of the printer’s circuitry and /printer mechanism.
  • Page 38 REV.-A FiiEElr 3D 10 Printer Mechanism Model HEAd B o a r d motor Release HOME PF motor — Control Panel 2Pin 12Pin 2Pin 1 OPin TAMA Board .5 co m ,- L’ “’? “: Filter Unit (OEM) r–––––––n 36 Pin .5 m T r a n s f o r m e r Power Input I...

  • Page 39: Outline Of Printer Mechanism Operation

    REV.-A 2.1.2 Outline of Printer Mechanism Operation Model 3D 10 is a 9-pin serial dot matrix printer. Because the frame and many of the components are of plastic, the mechanism is lightweight. A block diagram of the printer mechanism is shown in Figure 2-2.

  • Page 40: Sensors

    REV.-A 2.1.2.1 Sensors The printer mechanism is equipped with the following sensors: Paper-End (PE) Sensor Home-Position (HP) Sensor Friction/Tractor Sensor Paper-End Sensor (PE sensor) sensor. This sensor switch is ON when no paper is in place Figures 2-3 and 2-4 show the paper-end (e.g., when the paper supply has run out).
  • Page 41 REV.-A Home-Position Sensor (HP sensor) Figures 2-5 and 2-6 show the home-position sensor. The sensor switch is ON when the carriage is at the home position. Home position + ON -+ LOIA/ Other positions + OFF - HIGH This sensor determines the reference pcxsition for the carriage drive, age guide shaft iage...
  • Page 42 REV.-A :$-2! Friction/Tractor Sensor The release sensor senses the position of the release lever in order to detect whether tractor feed or friction feed is in effect. Release Lever Position : Front + F:riction Feed + OFF + HIGH level Release Lever Position : Rear -+ Tractor Feed ~ ON ~ LOW level Rear Front...

  • Page 43: Printhead

    REV.-A 2.1.2.2 Motors This printer has the following motors: Carriage motor (step motor) Paper-feed motor (step motor) Carriage Motor The carriage motor is used to move the carriage right and left along the platen. This unit employs a or 2-2 Phase excitation. An open-loop system is Used for control. 4-phase, 48-step motor using either 1-2 Paper-Feed Motor Paper...
  • Page 44 REV.-A 2 . 1 . 3 C i r c u i t O v e r v i e w diagram of the TAMA board circuitry. Figure 2-10 shows a block PROM 8KB/32KB 3 2 K B ‘ 3 ”) ’ (3C) --7rmm ADDRESS BUS (UPPER BYTEI...

  • Page 45: Power Supply Circuit

    REV.-A E05A30 gate array (3B) The E05A30 functions are as follows 1. Parallel l/F 2. Address decoder 3. Data address multiplexer 4. PF motor control 5. CR motor control 6. Control panel LED drive 7. Printhead drive control EEPROM (lC) The EEPROM has a 256-bit memory, and remembers the current paper position.

  • Page 46: Ta Filter Unit

    REV.-A P R I N C I P L E S O F O P E R A T I O N This section describes the operation of each component. 2 . 2 . 1 P o w e r S u p p l y C i r c u i t Filter Unit (which combines The electrical power required by this mechanism is developed using the TA a filter and a power transformer) and the TAMA board.
  • Page 47 REV.-A 2.2.1.1 TA Filter Unit incorporates the The filter board and the transformer are integrated into a single unit. This unit also power switch and the inlet for the incolming AC cable. The incoming AC power passes first through the over-current protection fuse (F 1 ) and the power switch, the noise on the and then into the filter circuit comprised of C 1, C2, C3, and L 1.
  • Page 48 REV.-A 2.2.1.2 + 12V DC Power Supply Circuit: shows, a half-wave rectifying circuit is used to convert the incoming 12VAC voltage Figure 2-13 to + 12VDC. The 12V output is used only for the option l/F board (via the CN2 connector on the TAMA board). The TAMA board itself does not utilize this voltage.

  • Page 49: Dc Power Supply Circuit

    REV.-A 2.2.1.3 +24V DC Power Supply Circuit The incoming AC + 26V is full-wave rectified by diode bridge DB 1, generating a DC voltage of about 36V. This voltage is converted by the switching regulator (uPC494C) to +24V DC. Figure 2-14 illustrates the circuit design. MQ1-3.
  • Page 50 REV.-A . . . + , , .,, Switching Regulator Circuit When the voltage is supplied from the rectifying circuit, a 27 switching pulse based on the external C3-R 10 circuit is created. At the same time, the standard voltage regulator outputs 5V, which is supplied, as a comparative voltage, to the negative terminal of error amplifier EA 1.
  • Page 51 REV.-A Feedback Circuit A voltage switching circuit is formed by RI 1, R 12, and R16, and the potential of the +24V output voltage is fed back to PPC494C. The line between R 12 and R 16 feeds back to the positive terminal of EA 1 in the PPC494C, where it is compared against the standard + 5V voltage.
  • Page 52 REV.-A Over-Current Protection Circuit Error amplifier EA2, in the KPC494, detects over-current caused either by abnormal operation, or by abnormality in the 24V line at the time of power up. Current-detecting resistor R2 is set at the EA2’s positive terminal (pin 16), and the current, converted to a voltage value, is monitored. The negative terminal of the EA2 is connected to the dividing circuit for the standard voltage (+ 5V) and the 24V output.
  • Page 53 REV.-A Switching Pulse Output The output of the error amplifier in KPC494C is determined by the difference between the output pulse of the internal oscillating circuit and the feedback voltage from the + 24V output. The feedback voltage changes according to printer operation (i.e., printer load). The output of the error amplifier acts to minimize this change, however, by responding as indicated in Figure 2-19.
  • Page 54 REV.-A ., ‘:! Chopping Circuit A chopper circuit consisting of diode D 1 and coil L1 is utilized at the output stage. If Q1 in ON, the coil acts as a resistor, and suppresses vic)lent current surges. When Q 1 goes OFF, the stored energy in the coil generates a reverse starting current, and current flows via D 1.

  • Page 55: Dc Power Supply Circuit

    REV.-A 2.2.1.4 +5V DC Power Supply Circuit The +5VDC is generated by the switching and step-down action that Q6 applies to the 24VDC supplied from the 24V power circuit. Immediately following power up, VI of SR 1 will be LOW, so that Q6 will be ON. Therefore, + 24V will be supplie, via Q6, to the chopper circuit (D2, L2) and the smoothing circuit (C7).

  • Page 56: Reset Circuit

    REV.-A 2.2.2 Reset Circuit This circuit generates the signal that initializes the printer, and is made by monitoring the + 5 and + 24V voltages when the power is switched ON and OFF. The reset signal line is connect to the CF’U and gate array 3B. Figure 2-22 shows the reset circuit. MA 165 A 1 0 1 5 +5V+...

  • Page 57: Operation At Reset

    REV.-A 2.2.2.2 Operation at Reset The reset signal causes the following operations to occur. 1. The printhead carriage moves to the left-side home position. 2. The printer enters the ON-LINE mode. 3. The print buffer and input buffer are cleared. 4.

  • Page 58: Carriage Operation

    REV.-A ,:;> 2.2.3 Carriage Operation , . , . This section describes the carriage operation. 2.2.3.1 Carriage Mechanism The carriage mechanism includes the printhead, the carriage, the timing belt, the carriage motor, and the platen. Figure 2-24 shows the carriage mechanism. The timing belt is connected to the bottclm of the carriage.
  • Page 59 REV.-A 2.2.3.3 Carriage Drive Circuit Block Diagram Figure 2-25 shows a block diagram of the carriage motor drive circuit. In this circuit, the phase switching for the carriage motor is directly executed not by the CPU, but by the gate array (3 B), which acts on vl drives the carriage motor with a stabilized current.
  • Page 60 REV.-A 2.2.3.4 Carriage Motor Drive Circuit This unit utilizes an SLA7020M IC for the step motor drive. This IC causes the motor to be driven at the specified current. The IC utilizes a MOSFET power element, so that heat generation is low, and there is no need to use a radiator board.
  • Page 61 +24V Phase X F24V ——— ———.—— $ !1 —— — ——.—.— 470p NOTE: Phase CD is equivalent to the above. Figure 2-27. SLA7020M Circuit Diagram...
  • Page 62 REV.-A SLA7020M Phase Signal Input Circuit Although most step-motor control IC’S input 4-phase data directly, the SLA7020M requires a special type of phase data. In the case of phase excitation: Figure 2-28 shows the excitation signal input circuit. The A-phase-side excitation signal input is via a single line. The output is divided among non-inverted A-phase output and A-phase output passed through an inverter.
  • Page 63 REV.-A In the case of 1-2 phase excitation: Figure 2-30 shows the excitation signal input circuit. When the Td terminal is LOW, the SLA702M can cut off the output current. By using this function, the unaltered 2-phase excitation signal can cause the 1-2 phase excitation to be on 3/8ths of the time, which is a suitable value.
  • Page 64 REV.-A Reference Voltage Generation Circuit Figure 2-32 shows the reference voltage generation circuit and Table 2-3 shows the reference voltage. The reference voltage generation circuit is shown in Figure 2-32, the reference voltages shown in Table 2-3. The SLA7020M drives the stepping motor based on current proportional to the reference voltages set here.
  • Page 65 REV.-A Constant Current Drive Circuit The constant current drive circuit is shown in Figure 2-33 (for A-phase only), and the waveforms for each part are shown in Figure 2-34. In Figure 2-33, the reference voltage is indicated by Vref; this voltage determines the peak current through resistance R30.
  • Page 66 REV.-A - - - - - - - - - .-.-J---------.--- -.-.-- - - - - - - - - - - - - - - ?------ - - - - - - - - , ------ : ----- . : - . ---- s ----------------------- ---- ;----------------- 0 VG —...
  • Page 67 REV.-A IOFF flow then causes current flow in R30 to change direction. COMP1 feedback voltage VRS (V-) thereby drops below COMP1 again inverts. VREF, and COMP 1 output stages are formed by an open collector circuit. As a result of the inversion in step (7), COMP 1 output goes HIGH, so that TD voltage VTD gradually rises, in line with the time constant determined by resistance R59 and capacitance C 15.

  • Page 68: Carriage Motor Software Control

    REV.-A 2.2.3.5 Carriage Motor Software Control This section describes the carriage motor software control. Excitation System The excitation system is determined by the firmware and is executed in accordance with the carriage speed, as shown in Table 2-4. The motor drive sequence for each excitation system is shown in Tables 2-5 and 2-6.
  • Page 69 REV.-A Because the carriage is driven by a step motor, the printing direction can be changed at any time, and the carriage can be stopped at any position. Carriage motor control is effected by an open-loop system which switches the phases in accordance with the set speeds. -f-e’’Jw-JL&aau (phase switching 1 “...
  • Page 70 REV.-A Printing Area The printing area is defined as starting 26 phase switching times following the home position. --JvLODJm-J_ Acceleration Area Printing Area Figure 2-37. Printing Area and Printing Timing Abnormal Carriage Operation This unit does not employ a print timing signal (PTS) sensor and cannot detect abnormal carriage operation.

  • Page 71: Paper Feed

    REV.-A 2,2.4 Paper Feed This section describes the paper-feed operation. 2.2.4.1 Paper Feed Mechanism Operation Friction feeding is used for cut sheets, and push tractor feeding is used for fanfold paper. Friction-Feed Operation The paper is held against the platen by paper-feed rollers. The paper-feed motor rotates the platen gear, via the paper-feed reduction gear, in the direction shown in Figure 2-38.

  • Page 72: Paper-Feed Motor Specifications

    REV.-A K<::;* ‘3:, ‘ Push Tractor Feed Operation When the push tractor unit is used, the paper is set such that its holes mesh with the tractor pins along the tractor belt. The paper feed motor is driven and, via the pinion on the motor shaft, rotates the gears in the direction shown in Figure 2-39, rotating the tractor belts.

  • Page 73: Paper-Feed Motor Drive Circuit

    REV.-A Paper-Feed Motor Drive Circuit 2.2.4.3 The paper-feed motor drive circuit is shown in Figure 2-40. The paper-feed motor is a step motor which can utilize 2-2 phase excitation. When the paper-feed signal PC2 is set to HIGH, Q20 and Q 16 are turned paper-feed motor is not driven, + 5 V is supplied, on, and +24 V is supplied to the motor.

  • Page 74: Paper-Feed Motor Software Control

    REV.-A 2.2.4.4 Paper-Feed Motor Software Control The paper feed motor is a 48-pole step motor and is open-loop controlled. When 2-2 phase excitation 1/2 16th is used to drive the motor, each step feeds the paper a distance of inch. Table 2-7 shows the paper-feed motor excitation system.

  • Page 75: Printhead

    REV.-A 2.2.5 Printhead This section describes the printhead operation. 2.2.5.1 Printhead Printing Operation The dot-wire operation during printing is as follows. When the head-driving coil for a dot wire is energized, the actuating plate, which is engaged to one end of the dot wire, is attracted to the iron core, and drives the dot wire toward the platen.

  • Page 76: Printhead Drive Circuit Block Diagram

    REV.-A 2.2.5.3 Printhead Drive Circuit Block Diagram Gate array E05A30 is used as an 8-bit + l-bit data latch. The CPU determines the pulse width for the head-wire drive pulses from gate array E05A30 by monitoring the printhead drive power (+24 V line). Pri nthead E05A30 ~ PD78 10HG...
  • Page 77 REV.-A 2.2.5.5 Printhead Drive Circuit The drive pulse width is adjusted using CPU port PC6. +24V 0 HDCOM O HD1 D1647 Q7 HD1 6 3 R20,,, IK E 0 5 A 3 0 D1647 Q9 HD2 6 2 R21,,, I K (3 B) HEAD D1647 Q8...
  • Page 78 REV.-A #r?, 2.2.5.6 Printhead Software Control During operation at 900 PPS, one print cycle is performed at each phase switching step, so as to meet the specifications of the printhead (solenoid drive frequency: 900 Hz). The drive pulse width is adjusted by using an A/D converter (Figure 2-47) to detect the drive voltage, and is kept within the area outlined by the oblique lines in Figure 2-47.
  • Page 79 ( 4 2 5 ) Drive Pulse Width (ils) 2 4 . 0 2 5 . 0 2 6 . 0 2 2 . 0 2 3 . 0 ( 2 6 . 4 ) (21 .6) Drive Voltage (VDC) Figure 2-48.
  • Page 80 REV.-A 2.2.6 Host Interface The host interface circuit is shown in Figure 2-49. STROBE pulses from the host computer pass through the low-pass filter, consisting of R72 and C 12, and flow into the STROBE terminal. These pulses latch the parallel data and set the BUSY signal HIGH, so that subsequent data transfer inhibited.
  • Page 81 REV.-A 2.2.7 EEPROM Circuit The EEPROM stores in its memory the current feed position of continuously fed paper, as well as the current panel settings. This memory is retained even after power is shut off. EEPROM can memorize the current position of continuously fed paper, so that this information can be maintained even if power goes off.
  • Page 82 REV.-A 2.2.8 Ribbon-feed Mechanism The ribbon-feed mechanism consists of the ribbon cartridge and the ribbon-feed section. The ribbon-driving gear is always driven counterclockwise (regardless of the timing belt direction) via the gear trains shown in Table 2-8. Table 2-8. Ribbon-Feed Gear Train Direction of M o v e m e n t o f Gear Train...

  • Page 83: Optional Equipment

    REV.-A CHAPTER 3 OPTIONAL EQUIPMENT 3.1 INTERFACE OPTIONS ............... .
  • Page 84 REV.-A $“ Removal of Sprocket Mounting Plate L ......3-17 Figure 3-14. “$. Removal of Sprocket Mounting Plate ......3-18 Figure 3-15.

  • Page 85: Interface Options

    REV.-A INTERFACE OPTIONS The LX-8 10/850 is able to utilize the Model 8100 series optional interfaces. The main interfaces are listed in Table 3-1. Table 3-1. Optional Interfaces Description Cat. X-O N\OFF Max. Bit Rates RS-232C Buffer Size Flag Control Control (bps) Current Loop...
  • Page 86 c ? , , : . REV.-A Jumper Settings Table 3-2. Jumper Settings Function ON: “TTY TXD” is brought to -t- 12V through 470 ohm register. ON: “TTY TXD RET” is connected to signal ground. ON: “TTY RXD” is brought to + 12V through 470 ohm register.
  • Page 87 REV.-A Table 3-4. Bit Rate Settings Bit Rata SW1-7 Swl-1 SW1-3 Bit Rata SW1-7 SW1-4 SW1-3 SW1-4 Swl-1 (bps) (JB4) (JB3) (JB2) (JB1 ) (bps) (JB4) (JB3) (JB2) (JB1 ) 1800 2400 4800 134.5 9600 19200 19200 19200 1200 19200 NOTE: For current loop operation, a data transfer rate greater than 1200bps cannot be guaranteed.

  • Page 88: Cut Sheet Feeder C80612

    REV.-A 3.2 CUT SHEET FEEDER C80612* The LX-8 10/850 printer can use C806 12* cut sheet feeder. This cut sheet feeder has the following features: 1. Cut sheets may be handled in the same way as fanfold paper. 2. Sheets may be manually inserted. 3.

  • Page 89: Cut Sheet Feeder C80612* Specifications

    REV.-A 3.2.1 Cut Sheet Feeder C80612* Specifications This section details the operating specifications for Cut Sheet Feeder C806 12*. 3.2.1.1 General Specifications For paper weight of: Hopper Capacity: 64 g/m2 ................185 sheets maximum 90 g/m2 .

  • Page 90: Printable Area

    REV.-A ,,p, ‘$-..Area 3.2.1.3 Printing See Figure 3-2. 3mm(0.i 2“) 3mrn(0.i 2’”) min. min. Printable area 8.5mm(0..33”) min. Printable area 13.5mm(0.53”) approx. Figure 3-2. Printing Area NOTES: The printable length is approximately 22mm (0.87 inches) less than the actual page length. Paper feed accuracy can not be assured within 22mm (0.87 inches) from either top or bottom edge.

  • Page 91: Dimensions And Weight

    REV.-A 3.2.1.4 Dimensions and Weight 7.5 inches) (Width) X 434 mm (1 7.1 inches) (Depth) X 416 Dimensions: mm (1 (1 6.4 inches) (Height) (including paper feed knob) NOTE: Dimensions were measured with the cut sheet feeder mounted on the printer. Figure 3-3.

  • Page 92: Cut Sheet Feeder Operating Principles

    REV.-A ‘+ 3.2.2 Cut Sheet Feeder Operating Principles The cut sheet feeder is driven by firmware incorporated in the printer. The feeder need not be electronically connected to the printer. Cut sheet feeder mode can be selected either by DIP switch or by command.

  • Page 93: Mechanism Operation

    REV.-A 3.2.2.1 Mechanism Operation Paper is loaded between the paper holder and the paper loading rollers. When the paper feed motor rotates in reverse, the gears, via the pinion on the motor’s shaft, rotate in the direction of the white arrows (see Figure 3-4), and friction causes the paper to advance to the paper guide.

  • Page 94: Cut Sheet Feeder Disassembly And Reassembly

    REV.-A f. . : 3.2.3 Cut Sheet Feeder Disassembly and Reassembly .*. -. This section describes the procedure for removing the hopper unit of the C806 12’ cut sheet feeder. Unless otherwise specified, reassembly is performed by reversing the sequence. The diagrams in Figure A-2 1, which are provided as reference for disassembly and reassembly, show an exploded view of the parts configuration.
  • Page 95 REV.-A 1. Remove side covers L and R. Side cover (L) .,. Side cover (R) Figure 3-5. Removal Side Cover 2. Remove the E-ring (6) on the paper loading roller shaft, and then remove the shaft. E-ring Paper Loading Shaft Figure 3-6.
  • Page 96 REV.-A $!:?., ..3. Remove the 2 E-rings (6) on the paper support shaft. E-ring (6) E-ring (6) Figure 3-7. E-Ring Removal Remove the shaft holder fastening the paper support shaft to frame L. = Shaft Holder Frame Figure 3-8.
  • Page 97 REV.-A 5. Remove the E-ring (6) on the paper support shaft (See Figure 3-9) 6. Lift, together, the hopper unit and the paper support shaft. Paper Loading Roller Shaft Holder E-ring (6) support ection Figure 3-9. Hopper Unit Removal 3 - 1 3...

  • Page 98: Cut Sheet Feeder Preventive Maintenance

    3.2.4.2 Lubrication EPSON recommends that the points indicated in Figures 3-10 and 3-11 be lubricated with EPSON O-3 and G-1 4 (see Table 3-7). These lubricants have been thoroughly tested and have been found to fully comply with the needs of the cut sheet feeder.
  • Page 99 REV.-A Figure 3-11. Lubrication Point (2) 3 - 1 5...

  • Page 100: Pull Tractor C80006

    REV.-A PULL TRACTOR C80006* The optional pull tractor C80006* provides optimu,m continuous paper handling. The pull tractor is especially useful with continuous multipart forms and labels. 3.3.1 Pull Tractor Operation When using the push-pull feed method, set the paper holes onto the pins along the sprocket wheel, and also onto the tractor pins along the tractor belt.

  • Page 101: Pull Tractor Disassembly And Reassembly

    REV.-A 3.3.2 Pull Tractor Disassembly and Reassembly 1. Remove the catch fastening the sprocket reduction gear to spocket mounting plate R. Then remove the Reduction gear. 2. From the sprocket shaft, remove the E-ring (6), the sprocket gear, the sprocket gear spring, and the washer.
  • Page 102 REV.-A Remove the E-ring (6) from the sprocket shaft, then remove sprocket mounting plate R. (@-ring’” Sprocket Mounting Plate R Figure 3-15. Removal of Sprocket Mounting Plate. From the sprocket shaft and the sprocket guide shaft, pull and remove sprocket set R, the paper guide roller, and sprocket set L.
  • Page 103 REV.-A Reassembly 1. Insertion of the paper guide roller onto the sprocket shaft should be in the direction indicated in Figure 3-17. 2. When inserting the sprocket roller into the sprocket shaft, the marked sides of both wheels should face to the left, and the markings should be analogously positioned. Shaft goes on er portion...
  • Page 104 REV.-A CHAPTER 4 DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT 4.1 GENERAL REPAIR INFORMATION ..........4-1 4.2 DISASSEMBLY AND REASSEMBLY .
  • Page 105 REV.-A Upper Casing Removal-1 ........... . . 4-5 Figure 4-5.
  • Page 106 REV.-A Figure 4-42. Platen Gap Adjustment Position ........4-28 LIST OF TABLES Table 4-1.

  • Page 107: General Repair Information

    REV.-A 4.1 GENERAL REPAIR INFORMATION This chapter describes the procedures for removing, replacing, and adjusting the main components of the LX-8 10/850. C A U T I O N cord is disconnected. Prior to beginning any of these procedures, be certain that the AC power To help prevent hands from being cut by the printer mechanism or sharp plate edges, wear gloves when performing these procedures.
  • Page 108 REV.-A To ensure optimal performance of the printer, be sure, following reassembly and adjustment, to ., in Chapter 6. lubricate, apply adhesive, clean, and maintain, according to the procedures described In referring to small parts, this manual utilizes the abbreviations listed in Table 4-3. Table 4-3.

  • Page 109: Disassembly And Reassembly

    REV.-A DISASSEMBLY AND REASSEMBLY This chapter details the disassembly procedures for the LX-8 10/850.As a rule, reassembly is performed by simply reversing the procedures; a number of special notes, however, are provided under the heading “Notes for Reassembly.” When a disassembly or reassembly procedure requires that an adjustment be performed, the adjustment is described under the heading, “Required Adjustment.”...
  • Page 110 REV.-A 3. Unlock the two levers securing the printhead to the carriage by pulling them down. Then lift and :-. remove the printhead. Figure 4-2. Printhead Removal Disconnect the head cable from the connector on the printhead. NOTE For the European version of the printer, a net is mounted on the printhead. -.

  • Page 111: Removal Of Casing

    REV.-A 4.2.2 Removal of Casing This section details the procedure for removing the upper casing and the control panel (TAPNL). 4.2.2.1 Upper Casing Removal Remove the sheet guide unit, printer cover, and paper feed knob. Push in the two notches securing the push tractor to the printer mechanism, and remove the push tractor from the printer mechanism.
  • Page 112 REV.-A ,:: , , .’ While lifting the upper casing, disconnect the cable of the control panel (TAPNL) from connector CN3 on the TAMA board. Then remove the upper casing. Figure 4-6. Upper Casing Removal -2 NOTE FOR REASSEMBLY: that connects the Contol Before reassembling the upper casing, prepare the FFC (Flat Flexible Cable) Cable Shield Plate.

  • Page 113: Control Panel (Tapnl) Removal

    REV.-A 4.2.2.2 Control Panel (TAPNL) Removal 1. Remove the upper casing (as described in the previous Section). 2. Turn the upper casing over, push in the two notches on the casing that are securing the control panel to it, and remove the control panel. anel Removal Figure 4-8.

  • Page 114: Removal Of Circuit Boards

    REV.-A 4 . 2 . 3 R e m o v a l o f C i r c u i t B o a r d s This section describes the procedure for removing the TAMA Board and the TA filter unit. 4.2.3.1 TAMA Board Removal 1.

  • Page 115: Ta Filter Unit Removal

    REV.-A 4.2.3.2 TA Filter Unit Removal 1. Remove the upper casing (refer to Section 4.2.2.1). 2. Disconnect connector CN9 at the TAMA board. This connector connects the TA filter unit. the CB(0) (M3 x 6) screws securing the frame GND wire. 3.

  • Page 116: Removal Of Printer Mechanism

    REV.-A 4.2.4 Removal of Printer Mechanism This section describes the removal of the platen unit, paper guide shaft, and printer mechanism. The platen unit and paper guide are removed first in order to enable quick and easy removal of the printer mechanism.
  • Page 117 REV.-A 3. Remove the paper tension unit. Figure 4-13. Paper Tension Unit Removal Remove the GND spring. GND spring Figure 4-14. GND Spring Removal 4-11...
  • Page 118 REV.-A g,}:! Turn the shaft holders at the left and right sides of the platen unit as shown in Figure 4-15. Lift and ~’-. remove the platen unit. \ Shaft Holder Use a screwdriver to push the shaft holder outward. Turn the shaft holder counterclockwise.
  • Page 119 REV.-A 4.2.4.2 Removal of Printer Mechanism 1. Remove the platen unit and paper guide (refer to Section 4.2.4.1, immediately above). 2. Disconnect the cables from the following connectors on the TAMA board: CN4 (red), CN5 (white), CN7 (white), and CN8 (flexible flat cable, or “FFC). Refer to Figure 4-9. 3.

  • Page 120: Disassembly Of Printer Mechanism

    REV.-A 4.2.5 Disassembly of Printer Mechanism from the printer mechanism. Figure A-1 9 shows an This section details the removal of components A-1 7 exploded diagram of the printer mechanism, offering a view of the various components. Table LIST. lists the components by name. COMPONENT NAME 4.2.5.1 Removal of The Paper-Feed Mechanism 1.
  • Page 121 REV.-A 3. Loosen the two tabs securing the paper guide plate and spacer to the frame, and lift and remove the plate. Spacer Figure 4-19. Removal of Paper Guide Plate NOTES FOR REASSEMBLY When remounting the paper guide plate and spacer to the frame, refer to Figure 4-20 for the mounting direction.

  • Page 122: Removal Of Paper-Feed Motor, Release Lever, And

    REV.-A Removal of Paper-Feed Motor, Release Lever, and Release /Tractor Sensor 4.2.5.2 Remove the printer mechanism (refer to Section 4.2.4). 2. Disconnect the motor cable from the paper-feed motor. 3. Loosen the two bent tabs on the frame which are securing the paper-feed motor, and remove the paper-feed motor.

  • Page 123: Release/Tractor Sensor

    REV.-A 5. From the inside of the frame, push the notch of the release lever outward. Remove the release Iever. Lever Figure 4-23. Removal of The Release Lever 6. Push the two notches securing the release/tractor sensor, and remove the sensor. Frame Push % ,,...

  • Page 124: Removal Of Paper-End Sensor

    REV.-A 4.2.5.3 Removal of Paper-End Sensor 1. Remove the platen unit and paper guide (refer to Section 4.2.4. 1). 2. Loosen the tab securing the paper guide. Using point A (refer to the Figure below) as a fulcrum, rotate the sensor a r r o w in the direction indicated by the arrow, and remove it in the direction shown by the below.

  • Page 125: Removal Of Carriage Unit

    REV.-A 4.2.5.5 Removal of Carriage Unit Remove the printer mechanism (refer to Section 4.2.4). Remove the printhead and disconnect the head cable. Turn the printer mechanism upside-down, and manually move the carriage unit until it is at the cut-out section of the carriage motor frame. The joint of the carriage unit and timing belt should be visible through the cut-out.
  • Page 126 REV.-A -1 ,,, . . . 6. Turn the printer mechanism over so that it is again face up. Rotate the lever on the left side of the carriage guide shaft counterclockwise, and pull it out through cutout A. Rotate the lever on the right side of the guide shaft clockwise, and remove it in the same way.
  • Page 127 REV.-A NOTES FOR REASSEMBLY When reinstalling, position the carriage guide shaft and the head adjust lever as shown in Figure 4-31. Guide Shaft Figure 4-31. Carriage Guide Shaft and Head Adjust Lever for the right side is black. Slide 2. The lever for the left side of the guide shaft is gray in color; the lever each lever onto the appropriate side of the shaft.

  • Page 128: Removal Of Carriage Motor

    REV.-A 4.2.5.6 Removal of Carriage Motor Perform Steps 1 to 5 of Section 4.2.5.4. 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 4-32.) With a screwdriver, loosen the four tabs securing the carriage motor frame to the chassis frame.
  • Page 129 REV.-A NOTES FOR REASSEMBLY: The following applies to E-ring reattachment: When attaching a ring to the left pulley shaft, set it so that its opening faces left. When attaching a ring to the right pulley shaft, set it so that its opening faces right. O Use tweezers to check that the attached retaining rings are firmly in place and will not not move.

  • Page 130: Removal Of Home-Position Sensor

    REV.-A ..,:, 4.2.5.7 Removal of Home-Position Sensor 1. Remove the carriage motor frame. Follow Steps 1 to 3 of Section 4.2.5.6. 2. Push in the notch securing the home-position sensor, and remove the sensor from the carriage motor frame. Home Position Sensor Carriage Motor F r a m e Figure 4-34.

  • Page 131: Disassembly Of The Tractor Unit

    REV.-A 4.2.5.9 Disassembly of The Tractor Unit 1. Remove the E-ring on the tractor shaft. 2. Pull and remove the tractor shaft from the tractor frame. 3. Pull and remove the sprocket guide shaft from the tractor frame. Tractor Frame (L) ‘Am ‘?;cke’’uide LLJ”...
  • Page 132 REV.-A NOTES FOR REASSEMBLY ---- When reassembling, align the phases as shown below. /’ ‘,, ’-, Figure 4-38. Tractor Phase Alignment 4-26...

  • Page 133: A D J U S T M E N T

    REV.-A A D J U S T M E N T This section describes the adjustment procedures necessary when the LX-8 10/850 printer is reassembled or when parts are reinstalled or replaced. These procedures are necessary to ensure the correct operation of the printer. Platen Gap Adjustment 4.3.1 Following the removal of the carriage guide shaft or carriage guide shaft levers, or if printing is abnormal,...
  • Page 134 REV.-A 0.4!5 & 0.01 m m Printhead Platen Figure 4-40. Platen Gap Adjust Lever Carriage Guid Frame (Left Side) Shaft Lever (L Figure 4-41. Carriage Guide Shaft Lever Movement Clockwise rotation widens gap. Carriage guide shaft (left): Counterclockwise rotation narrows gap. Clockwise rotation narrows gap.

  • Page 135: List Of Figures

    REV.-A CHAPTER 5 TROUBLESHOOTING 5.1 GENERAL ....................5-1 REPLACEMENT .

  • Page 136: Printhead Removal

    REV.-A 5.1 GENERAL Troubleshooting is based on the idea that error symptoms vary according to the defective component. Troubleshooting may involve either unit replacement or unit repair, each of which is treated separately below. First try to determine the defective unit by referring to section 5.2. The flowcharts in the section should help you to isolate the defective unit.
  • Page 137 REV.-A Table 5-2. Symptom and Reference Pages CC;, & L,:.. Problem Reference Page Symptom . Carriage does not move. Printer Fails to Operate with Control panel indicator lamp does not light. Power Switch ON Carriage moves away from home position at power Abnormal Carriage Operation The carriage correctly returns to the home position, but the printer then fails to enter READY mode.
  • Page 138 (1) Printer Fails to Operate with Power Switch ON START Use correct AC - END input voltage. F 1 on the TA filter Replace the fuse. Measure the output voltage from power circuit on TAMA boa rd. Replace the TAMA board or TA filter unit.
  • Page 139 REV.-A (2) Abnormal Carriage Operation connectors CN5, Secure connecting the SAMA circuit connectors Replace move to the home the printer m e c h a n i s m . +. . . Replace the TAMA circuit board.
  • Page 140 REV.-A (3) Faulty Printing during Self-Test, but Carriage Operation is Normal connector between the printer mechanism and TAMA circuit board correctly connected Measure the printhead Reinsert then correctly resistance. (Fig.5- 1 ) • Replace the printhead.
  • Page 141 REV.-A Printhead ( Wire assignment) Coil Resistance: # 7 x 5 C O M . x19#18 19.2 A 1.9 Q at 25°C (8etween each dot wire and common.) #“ 1 # 3 #2#4#6 ( Terminal assignment) Figure 5-1. Printhead Resistance...
  • Page 142 REV.-A (4) Abnormal Paper Feed (but normal printing) START Set the paper correct I y. +> ~per’T;e;hLo Replace the Printer rotate smoothly when mechanism. turned manually w“th ‘Dower OFF? & Replace the TAMA circuit borad.
  • Page 143 REV.-A Panel Operation (5) Abnormal Control connector CN3 between the control Reinsert connector CN3 correctly Replace the TAMA circuit board? Replace the control panel. Replace the control Replace the TAMA circuit board?
  • Page 144 REV.-A (6) Faulty Printing in ON-LINE Mode NOTE: [t is assumed here that the host computer is operating normally. START Perform self-test. Refer to other troubleshooting ite ms. Replace the TAMA circuit bord.

  • Page 145: Repair

    REV.-A U N I T R E P A I R This section indicates the points to be checked in response to problems, and the measures to be taken based on the result of the check. Utilize the checkpoints to determine and correct defective components. Tables 5-4 and 5-5, below, are divided into the five following columns: Indicates the problem P r o b l e m :...

  • Page 146: Tama Control Board Unit Repair

    REV.-A 5.3.1 TAMA Control Board Unit Repair The following chart shows the main components on the TAMA board. Table 5-3. TAMA Board Parts List Parts No. Location Parts Name Description KPD7810HG X400078 101 E05A30 Gate Array Y463800001 SRAM2064C-15 X400 120642 SRAM X 4 4 0 0 7 0 2 0 0 S L A 7 0 2 0 M...
  • Page 147 REV.-A Table 5-4. TAMA Board Unit Repair ,= ,. %,” f“ .-m.. “ , ,., 5-12...
  • Page 148 REV.-A Table 5-4. TAMA Board Unit Repair (Continued) Solution Check point Cause Problem Symptom ~eplace Q5. rhe printer The CPU is Check the Voltage Waveforms at the rhe reset + 24V and for the RESET signal. ~oes not op- :ircuit is not ?rate at all.
  • Page 149 REV.-A Table 5-4. TAMA Board Unit Repair (Continued) Solution Cause Check point Symptom Problem Replace The CPU is The CPU is Check for oscillator signal at either pin The printer CPU. C P U . 31 or pin 32 of the defective.
  • Page 150 REV.-A Table 5-4. TAMA Board Unit Repair (Continued) Problem Symptom Check point Cause Solution rhe Carriage The Carriage IC 3B or IC At IC 1A, check the input signal at pin 5 Replace 3B )perates does not op- IA is and the output waveform at pin 1 or 1A.
  • Page 151 REV.-A Table 5-4. TAMA Board Unit Repair (Continued) 5 - 1 6...
  • Page 152 REV.-A Table 5-4. TAMA Board Unit Repair (Continued) Problem Symptom Cause Check point Solution Replace The IC 3B or At Q21 - Q24, check the base waveform ‘aper is not The paper Q21 - Q24. ‘ed normally. feed pitch is transistor and collector waveform.

  • Page 153: Printer Mechanism Repair

    REV.-A 5.3.2 ,F:’: Printer Mechanism Repair For detailed procedures for replacing or adjusting parts, refer to Sections 4.3 (“Disassembly and Reassembly”) and 4.4 (“Adjustment”). If a problem or system recurs following an attempted repair, refer back to the Tables above to try to find other potential causes.
  • Page 154 REV.-A Table 5-5. Printer Mechanism Repair (Continued) Checkpoint Solution Problem Symptom Cause A particular Measure the coil resistance of the printhead. Self-test The printhead Replace the printing is dot fails to The normal value is approx. 19.2 printhead is defective. ohms print.
  • Page 155 REV.-A Table 5-5. Printer Mechanism Repair (Continued) Cause Checkpoint Problem S y m p t o m Solution Ribbon feed The ribbon is The ribbon Dismount the ribbon cartridge, rotate its knob Replace the is defective. not fed. cartridge is manually, and check whether the ribbon ribbon defective.
  • Page 156 REV.-A CHAPTER 6 MAINTENANCE 6.1 PREVENTIVE MAINTENANCE ............6-1 6.2 LUBRICATION AND ADHESIVE APPLICATION .

  • Page 157: Preventive Maintenance

    LUBRICATION AND ADHESIVE APPLICATION EPSON recommends lubrication at the points illustrated in Figure 6-2. Table 2 provides a list of these points, and the recommended lubricant to be used for each. The lubricants-EPSON O-2, EPSON G-20, EPSON G-26, and EPSON G-37–have all been thoroughly tested and fully meet the needs of this printer.
  • Page 158 REV.-A Table 6-2. Lubrication Points (Refer to Figure 6-2) Ref. No. Lubrication Points Lubricant Shaft which sets paper feed reduction G-26 Contact portion of sub paper re!ease lever and paper release lever, G-26 Oil pad Carriage guide shaft (at both left and right sides of carriage) G-26 Carriage guide plate (the portion that contact the carriage) G-26...
  • Page 159 REV.-A Figure 6-2. LX-81 0/850 Lubrication Points...
  • Page 160 REV.-A APPENDIX A.1 INTEGRATED CIRCUITS WITHIN THE LX-810/850 ....A-1 A.1.l CPU PPD781OHG (2C) ............A-2 A.1.2 E05A30 (3B) .
  • Page 161 REV.-A LIST OF TABLES TAMA Board ICS ..............Table A-1.
  • Page 162 REV.-A This appendix provides detailed information about the integrated circuits, signal functions, capabilities, and other aspects of the LX-8 10/850 printer components. A.1 INTEGRATED CIRCUITS WITHIN THE LX-810/850 Table A-1 shows TAMA board ICS. Table A-1. TAMA Board ICS Type Location Name of IC K P D 7 8 1 0 H G...
  • Page 163 REV.-A CPU /APD7810HG (2c) A.1.l The pPD78 10/781 1 HG is comprised of an 8-bit timer counter, an 8-bit A/D converter, 256 bytes of RAM, and a serial interface. A system can easily be constructed with this IC. The main features of this IC are listed below.
  • Page 164 REV.-A u+” PORT C PORT D PORT B PORT A Figure A-2. KPD781 0/7811 HG Block Diagram...
  • Page 165 <,”> ‘ * -:; Table A-2. PPD781 O Mode Setting Mode 1 Mode O Externa! Memory 4K, addresses O to OFFF 1 (Note) 16K, addresses O to 3FFF 1 (Note) 1 (Note) 64K, addresses O to OFFF Table A-3. vPD781 1 PF Operation External Memory Port Port...
  • Page 166 REV.-A Table A-5. NPD7810/7811 Port Functions Descriptions Signal Direction PAO-7 In/Out Port A 8-bit 1/0 with output latch. 1/0 possible with mode A (MA) register. Output HIGH. PBO-7 In/Out Port B 8-bit 1/0 with output latch. 1/0 possible with mode B (MB) register. 9-16 Output HIGH.
  • Page 167 REV.-A f“? CPU Timing %.<. Refer to Figures A-3 through A-5 for CPU timing diagrams. Three oscillations define one state. The OP code fetch requires four states. During T 1 to T3, program memory is read, and instructions are interpreted during T4. Address bus lines 15-8 are output from T 1 to T4. Address bus lines 7-O (PD7-0) are used in the multiplex mode.
  • Page 168 REV.-A A.1.2 E05A30 (3B) This gate array was newly developed for this printer. Its functions are as follows: 1. Parallel l/F 2. Address decoder 3. Control panel LED drive 4. Data address multiplexer 5. PF motor control 6. CR motor control 7.
  • Page 169 REV.-A *,.,, “+ . . Table A-6. E05A30 Pin Functions Pin No. Function Signal Function Pin No. Signal Printhead drive 7 Printhead drive 8 Parallel l/F ACKNLG Printhead drive 9 PELP PE LED Address O CR motor phase A AB 1 Address 1 CR motor phase B Address 2...
  • Page 170 REV.-A SRAM (3D) A.1.3 2(964C The 2064C is an 8K-byte CMOS static RAM. The 2064C has low power consumption, and its input\ output level is compatible with the TTL ICS. Figure A-7 shows the 2064C pin diagram, and Figure A-8 shows a block diagram for the 2064C static RAM. Features Capacity of 8192 words X 8 bits TTL compatible 1/0...
  • Page 171 REV.-A <:;, A . 1 . 4 ER59256 (lC) Y.’ RAM containing 16 words x 16 bits, and the data can The ER59256 is a 256-bit nonvolatile CMOS be transferred serially over the data bus. The ER59256 compact and low-priced 8-pin package. Each bit of RAM is paired with a bit in uses a the nonvolatile electrically programmable ROM (EEPROM) for backup.
  • Page 172 REV.-A A.1.5 SLA7020M (1A) The SLA7020M ia a two-circuit, 4-phase step motor driver for unipolar constant current driving. & I 2 3 4 5 6 78 91011 ! 2131415 Figure A-1 1. SLA7020M Case Outline Drawing Qvcc J-C2 Figure A-1 2. SLA7020M Functional Equivalent Circuit A-1 1...
  • Page 173 REV.-A A.1.6 pPC494C (3A) block diagram is shown in Figure A-13 s h o w s The ~PC494C is pulse width modulation control. The Reference Low Voltage .*.. ‘ Figure A-1 3. wPC494C Block Diagram A-1 2...
  • Page 174 REV.-A A.2 EXPLODED DIAGRAMS AND SCHEMATICS The exploded and schematic diagrams shown in Figures A-1 4 to A-22 are provided as additional reference. Power SW CN 1 26VAC r e d INPUT — — — ‘ blue 12VAC Figure A-1 4. TA Filter Unit Circuit Diagram A-13...
  • Page 175 REV.-A ONLINE SW FF SW 200Q LF SW d~ LQ/EJ ‘ BUZZER , GREEN GREEN LED2 READY LED3 ONLINE LED4 < b Figure A-1 5. TAPNL-W Board Circuit Diagram ., .,.. ‘..A-1 4...
  • Page 176 REV.-A Ei3’ “%’g :L__4-4 Figure A-1 6. TAMA Board Component Layout A-1 5...

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