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Compaq LA36 Service Manual

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  • Page 1 Service Manual...

  • Page 2: Service Manual

    Compaq Matrix Printer LA36 Service Manual Compaq Computer Corporation Houston, Texas...
  • Page 3 Revised contents June 1999 – First issue The contents of this manual may be revised without prior notice. All Rights Reserved, Copyright © 1999 Compaq Computer Corporation. No part of this manual may be reproduced in any form without permission.
  • Page 4 PREFACE This manual is for engineers who operate, install, or maintain the Compaq Matrix Printer LA36N/LA36W. The topics covered are: Chapter 1: Printer specifications, performance, and configuration Chapter 2: Unpacking, performance check, and connection Chapter 3: Troubleshooting Chapter 4: Maintenance...
  • Page 5 CONTENTS CHAPTER 1 PRINTER SPECIFICATIONS, PERFORMANCE, AND CONFIGURATION .... 1-1 CHAPTER 2 UNPACKING, PERFORMANCE CHECK, AND CONNECTION ......... 2-1 CHAPTER 3 TROUBLESHOOTING ......................3-1 CHAPTER 4 MAINTENANCE ........................4-1...
  • Page 7 CHAPTER 5 PRINCIPLES OF OPERATION ..................5-1...
  • Page 8 CHAPTER 6 RECOMMENDED SPARE PARTS ..................6-1...
  • Page 9 ILLUSTRATIONS...
  • Page 11 TABLES...

  • Page 12: Chapter 1 Printer Specifications, Performance, And Configuration

    CHAPTER 1 PRINTER SPECIFICATIONS, PERFORMANCE, AND CONFIGURATION 1.1 Overview print span Figure 1.1 LA36N and LA36W printers...

  • Page 13: Model Configuration

    1.2 Equipment Structure 1.2.1 Overview 1.2.2 Model configuration Print span Input voltage Color No color kit 80 columns 100 to 120 VAC (LA36N) Color kit No color kit 220 to 240 VAC Basic models Color kit 136 columns No color kit 100 to 120 VAC (LA36W) Color kit...
  • Page 14 1.2.3 Structure boldface Note: Front cover Top cover Acoustic cover [soundproof cover] Control panel [OP board] Bail roller unit Platen knob Tractor unit Printing mechanism [printer mecha assy] Platen assy [platen roll assy] Carriage unit [carrier unit] Carrier cable assy elay cable assy SP motor assy [space motor assy] Copy control lever...
  • Page 15 (1) Upper cover assembly Figure 1.3 Upper cover assembly (LA36N) a. Upper cover b. Front cover c. Top cover d. Acoustic cover e. Control panel...
  • Page 16 Cut-sheet stand g. Back cover (2) Printing mechanism assembly a. Frame assembly b. Carriage unit c. Space motor and stay shaft assemblies d. Sensors e. Forms feed mechanism Tractor unit Bail roller unit (LA36N only)
  • Page 17 (3) Lower cover assembly Figure 1.4 Printer lower assembly (LA36N) a. Bottom cover b. Printer control board c. Power supply...

  • Page 18: Chapter 2 Unpacking, Performance Check, And Connection

    CHAPTER 2 UNPACKING, PERFORMANCE CHECK, AND CONNECTION Setting Installation Guide 2.1 Overview 2.2 Notes on Installation...
  • Page 19 2.3 Unpacking Figure 2.1 Unpacking the printer and accessories...
  • Page 20 Figure 2.2 Removing the print head shipping restraint (cardboard) Figure 2.3 Remove the bail stopper and four tapes (LA36N)

  • Page 21: Inspection After Unpacking

    2.4 Inspection after Unpacking Installation Guide Installation Guide Figure 2.4 Installing the cut-sheet stand...

  • Page 22: Chapter 3 Troubleshooting

    CHAPTER 3 TROUBLESHOOTING...
  • Page 23 Printer Gears 100-120 VAC or Printing mechanism Color ribbon shift motor 220-240 VAC Power supply Print Sensors motor motor head Centronics (parallel) Printer control board To computer RS-423 board RS-423 (serial) Control panel Note: indicates a cable and connector. Figure 3.1 Printer functional block diagram a.
  • Page 24 e. Power supply Color ribbon shift motor (user option)
  • Page 25 3.1 All Indicators Don't Light All indicators don’t light. Does the mechanism move? The control panel is defective. Is the power switch turned on? Turn on the power switch. Turn off the power switch, then Is the power plug disconnected insert the power plug into the from the receptacle? receptacle.
  • Page 26 Continued from the previous page Unplug the AC input cord from the printer power connector, then Replace the AC power cord. check again AC voltage supplied to the printer. Is it correct? Are all connectors to the printer Connect connectors. control board connected? Do voltage check.
  • Page 27 3.2 No Print Head Movement The Fault indicator lights but the print head does not move. Defective printer control board Does the buzzer sound continuously? (ROM/RAM error) Are all connectors to the printer Connect connectors. control board connected? Turn off the power switch, unplug the interface cable, and turn on the power switch again.
  • Page 28 The Fault indicator lights and the buzzer sound once. Are continuous forms in the printer? Set continuous forms in the printer and press the FF/Load button. Is the Fault indicator off? Recovered Push and release the paper end feeler equipped on the right-hand tractor. Does the sensor shield lever move Replace the paper end detection up and down?
  • Page 29 No printing online Is the interface cable connected? Connect the interface cable. Is the interface cable OK? Replace the interface cable. No (Centronics) Is the RS-423 interface used? See page 3-5, DC voltage check. Is the selected protocol OK? Use the correct protocol. Is the selected baud rate OK? Use the correct baud rate.
  • Page 30 3.3 Incorrect Printing due to Defective Nonvolatile RAM...
  • Page 31 3.4 Printing Quality Abnormal Printing quality is poor. Is the paper thickness lever set Set the lever correctly. properly? Remove the print head and install it Is the print head installed correctly? correctly. Is the ribbon cartridge installed Install the ribbon cartridge correctly. properly? Is the ribbon worn out, or ink too Turn off power and change the...
  • Page 32 Continued from the previous page Are several character dots missing? See page 3-12. Is self-test printing normal? • Defective printer control board See Section 4.10.1 for self-test. • Defective power supply board Is the interface cable connected Plug in the connector correctly. correctly? Is the interface cable OK? Replace the cable.
  • Page 33 Dot missing Replace the print head. Recovered Is printing done correctly? Is the carriage cable connected Plug in the carriage cable correctly. correctly? • Defective printer control board • Defective carriage cable Color mixing abnormal Is the ribbon cartridge installed Install the ribbon cartridge correctly.
  • Page 34 3.5 Forms Feed Abnormally Abnormal forms feed Are forms fed? See page 3-14. Press the FF/Load button. Are forms fed? No abnormality Are forms positioned correctly? Load forms correctly. Is the paper feed motor cable Connect the cable correctly. connected correctly? •...
  • Page 35 Forms are fed but there is still a problem. Is the paper thickness lever set Set the paper thickness lever correctly? correctly. Is the paper select lever set Set the paper select lever correctly. correctly? Are forms fed smoothly? See the entry below. Are unspecified or abnormal forms Replace forms with specified or used?

  • Page 36: Error Display

    3.6 Error Display Table 3.1 Errors indicated by the Fault indicator and buzzer Fault indicator Buzzer sound Error cause Action for recovery from error Table 3.2 Alarms that turn power off the printer Error name Cause of the error...

  • Page 37: Chapter 4 Maintenance

    CHAPTER 4 MAINTENANCE 4.1 Overview 4.2 Notes on Use...

  • Page 38: Maintenance Tools

    4.3 Maintenance Tools Table 4.1 Maintenance tools Tool Type or part number Maintenance level (*1) (*1) (*2) (*1) (*3) (*3) 4.4 Maintenance Levels 4.5 Preventive Maintenance...

  • Page 39: Parts Drawings

    4.6 Parts Drawings Figure 4.1 Basic components...

  • Page 40: Parts That Must Not Be Disassembled

    4.7 Parts That Must Not Be Disassembled Table 4.2 Parts not to be disassembled Components Part Remarks...

  • Page 41: Level 1 Maintenance

    4.8 Level 1 Maintenance Table 4.3 Cleaning Location Procedure Remarks (*1) (*2) Figure 4.2 Cleaning and lubrication...
  • Page 42 4.9 Level 2 Maintenance 4.9.1 Parts replacement...
  • Page 43 (1) Acoustic cover replacement Removal Installation...
  • Page 44 (2) Tractor unit replacement a. Push tractor Removal Installation...
  • Page 45 b. Pull tractor Removal...
  • Page 46 Installation...
  • Page 47 (3) Cover replacement, including platen knob Removal...
  • Page 50 Installation...
  • Page 51 (4) Control panel replacement Removal Installation...
  • Page 52 (5) Printing mechanism replacement Removal Installation...
  • Page 53 (6) Power supply and fuse replacement Removal Fuse (*) power supply CNPW connector AC connector (LA36N only) Installation Clamp of rod Power supply CNPW connector...
  • Page 54 (7) RS-423 board replacement Removal RS-423 board. Control board.
  • Page 55 (8) Control board (ROM board) replacement Removal Control board Connector...
  • Page 56 hInstallation EP ROM (program) : IC1 Mask ROM (CG) : IC3...
  • Page 57 (9) Platen roll assembly replacement Removal Installation...
  • Page 58 (10) Paper feed motor (LF motor) replacement Removal Installation...
  • Page 59 (11) Space motor (SP motor) assembly replacement Removal Installation...
  • Page 60 (12) Sensor T assembly replacement Removal Installation...
  • Page 61 (13) Carriage unit replacement Removal...
  • Page 62 Installation...
  • Page 63 (14) Print head and rebbon feed assembly replacement Removal View A Installation...
  • Page 64 (15) Gear assembly replacement Removal Installation...
  • Page 65 (16) Paper feeder assembly replacement Removal Installation...
  • Page 68 4.9.2 Adjustment...
  • Page 69 Adjustment lever L Left-side frame Paper thickness lever Adjustment lever R Right-side frame...
  • Page 71 ® ¬ ¬ ® ¯...
  • Page 72 User Guide (CD-ROM) ¯ ­ ¯ ­ HHHHHHHHHH...
  • Page 73 4.9.3 Lubrication...
  • Page 77 1-FL-F-O Stay shaft Asy Front stay Carriage unit 2-SG-C-O...
  • Page 84 4.10 Diagnostics 4.10.1 Self-test printing ® ¯ ¯ Power-on initiated self test does not contain header and help menu.
  • Page 86 4.10.2 Hex dump ® ¯ ® ¯...
  • Page 87 4.10.3 Control panel maintenance functions initiated when power goes on Table 4.4 Power-on-initiated maintenance...
  • Page 88 CHAPTER 5 PRINCIPLES OF OPERATION 5.1 Overview Carriage drive Print head drive Paper feed drive Figure 5.1 Function sequence...
  • Page 89 5.2 Mechanical Operation 5.2.1 Print head drive Figure 5.2 Print head...
  • Page 90 5.2.2 Carriage drive Figure 5.3 Carriage drive...
  • Page 91 5.2.3 Ribbon feed Figure 5.4 Ribbon feed...
  • Page 92 5.2.4 Paper feed Figure 5.5 Paper feed path...
  • Page 93 (1) Continuous forms feeding a. Push tractor Figure 5.6 Continuous form feeding (push-feed tractor)
  • Page 94 b. Pull tractor Figure 5.7 Continuous form feeding (pull-feed tractor)
  • Page 95 (2) Cut-sheet feeding Figure 5.8 Cut-sheet feeding...
  • Page 96 (3) Paper selection Figure 5.9 Paper selection...
  • Page 97 (4) Autoloading Figure 5.10 Autoloading a. Continuous forms (push tractor only) b. Cut sheets...
  • Page 98 (5) Paper end detection a. Cut sheet Figure 5.11 Paper end detection (cut sheet)
  • Page 99 b. Continuous forms fed via push tractor Figure 5.12 Paper end detection (continuous forms via push-feed tractor))
  • Page 100 c. Continuous forms fed via pull tractor from the bottom slot d. Continuous forms fed via pull tractor from the rear side Figure 5.13 Paper end detection (continuous forms via pull-feed tractor)
  • Page 101 5.2.5 Print head gap control (paper thickness adjustment) Figure 5.14 Print head gap control...
  • Page 102 5.2.6 Color ribbon shift motor (option) Figure 5.15 Color ribbon shift motor...
  • Page 103 5.2.7 Option detection mechanism Figure 5.16 Option detection mechanism...

  • Page 104: Electrical Operation

    5.3 Electrical Operation 5.3.1 System configuration Printer Printer control board (Main board) Control panel Sensors MB90706 Interface Printing controller mechanism Host (Centronics) computer Driver MBCU20050 circuit Interface controller (RS-423) Power supply unit Figure 5.17 System configuration...
  • Page 105 Sensors: Power supply Color ribbon Paper select shift motor Paper end Sensors: Print head AC input 100 V: PW34AA Left end 100 ~ 200 VAC or 200 V: PW34 BA 220 ~ 240 VAC CNSEN CNHD3 CNHD1 CNHD2 CNPW Centronics Control board (main board) RS-423 RC98CB...
  • Page 106 (1) Printer control board (ROM board) (2) Power supply unit (3) Sensors (4) Control panel...
  • Page 107 RS-423 board Control board (main board) Interface Driver/ D-RAM receiver (Programs) (Data, etc.) (CG) (Centronics) Interface Driver/ receiver Buzzer Address Data Alarm HDLSI detector Reset Multisensor Thermal Driver Driver Driver Driver +34V check +34V check Print head Ribbon +34V Paper Sensors Carriage Push buttons...
  • Page 108 ADDRESS DATA MC-16 Clock control circuit SPM00~03 Space motor control circuit SPI01~02 DATA01~08 Centronics EXPRM interface INPRM control DSTB circuit Paper feed *ACK LFM00~03 motor control BUSY circuit LFI01~02 *FAULT SLCT *AFXT *SLCTIN Color ribbon CLM00~03 shift motor *FLTO control circuit RS-232C interface control...
  • Page 109 TIMER1 Print head driver and controller A01~A05 Address *EXIOCS decoder PD01~24 *IOWRL *IOWRH *IORD Flyback FLYBK01~06 controller Division circuit D00~D15 I/O port OUT00~07 IN00~IN04 HDALM00~06 Alarm detection *POWST SPALMS circuit SPALML *DVALM LFALMS LFALML Figure 5.21 MBCU20050 block diagram...

  • Page 110: Main Controller

    5.3.2 Main controller 000000 I/O and work RAM 5FFFFF 600000 Program ROM A00000 Resident CG C00000 Resident CG (optional) E00000 Buffer RAM FFFFFF Figure 5.22 Memory configuration...
  • Page 111 Table 5.1 Memory address map Address area (hex) Size (bytes) Read/Write Description...
  • Page 112 5.3.3 Interface control (1) Centronics parallel interface *DSTB DATA 1 DATA 8 BUSY *ACK Figure 5.23 Centronics parallel interface signal timing...
  • Page 113 (2) RS-423 serial interface Read data ST D Transmitted data ST D Figure 5.24 RS-423 serial interface signal timing...

  • Page 114: Carriage Motor Control

    5.3.4 Carriage motor control +34V MB90706 SPM0 to 3 SP or LF motor LFM0 to 3 SPI1, SPI2 LFI1, LFI2 HDLSI MBCU20050 POWST SPALML or LFALML Fire check SPALMS or LFALMS circuit Figure 5.25 Stepping motor drive circuit...
  • Page 115 Figure 5.26 Phase switching and carriage drive direction...
  • Page 116 Draft (High-speed) NLQ (*2) (*1) (*1) Letter quality 112.5 Time *1 Slewing *2 Near-letter-quality, also called correspondence Figure 5.27 Relationship between carriage drive speed and phase excitation...
  • Page 117 Idle Operating SPI1, 2 SPM0 (φA) SPM1 (φB) SPM2 (φC) SPM3 (φD) Drive A A B B C C D D A A B B C C D D A A phase Figure 5.28 Carriage drive 1/2-phase excitation at low speed SPI1, 2 SPM0 (φA)
  • Page 118 5.3.5 Print head control MB90706 HDLSI +34V FLYBK1 MBCU20050 Flyback ~FLYBK6 absorbing circuit PD01~PD24 HALM1 ~HALM4 Fire HDALM1 Check ~HDALM4 Circuit Figure 5.30 Print head pin magnet drive circuit...
  • Page 119 T offset T offset HDTIM PD01~PD24 (Main excitation) FLYBK01~FLYBK06 (Flyback) Head current HDTIM : Basic print operation timing PD01~PD24 : Print head excitation time FLYBK01~FLYBK06 : Flyback absorption time T offset : Offset time (for correcting head pin location) Figure 5.31 Print timing...
  • Page 120 5.3.6 Paper feed control Figure 5.32 Phase switching and paper feed direction...
  • Page 121 Paper feed speed 5.6 ips Time Figure 5.33 Paper feed speed Idle Operating LFI1, 2 LFM0 (φA) LFM1 (φB) LFM2 (φC) LFM3 (φD) Figure 5.34 1/2-phase excitation of paper feed...
  • Page 122 5.3.7 Ribbon shift control Figure 5.35 Phase switching and ribbon shift direction...
  • Page 123 Ribbon shift speed Time Figure 5.36 Ribbon shift speed Ribbon shift stop Ribbon shift in progress Ribbon shift stop CLM0 (φA) CLM1 (φB) CLM2 (φC) CLM3 (φD) Figure 5.37 Ribbon shift phase excitation...
  • Page 124 5.3.8 Fire check control (1) Short-mode detection a. Detection circuit b. Time constant circuit c. Compare circuit d. HDLSI (2) Long-mode detection a. Detection circuit b. Time constant circuit c. Compare circuit...
  • Page 125 d. HDLSI +34V +34V +34V +34V +34V Detection circuit Motor fire check Compare circuit Head fire Time check constant circuit Short-mode detection SG1 SG1 circuit Compare circuit Time Detection constant circuit circuit Long-mode detection HDLSI MBCU20050 SPALMS SPALMS 624µs LFALMS LFALMS timer PWSTOP...
  • Page 126 5.3.9 Control panel control MB623829 LEDs *OPDOT Serial-to- parallel converter *LOAD Internal *SHIFT control *BKSI circuit Switches *SDIN Parallel-to- serial converter Buzzer BZCLK Figure 5.39 Control panel block diagram...
  • Page 127 5.3.10 Power Supply (1) Surge current prevention (Figure 5.41 A) (2) Rectifying and smoothing (Figure 5.41 B) Rectifier circuit Thermistor AC input Figure 5.40 Surge current prevention circuit...
  • Page 128 3-terminal regulator Surge Main Smooth- Smooth- current Noise Rectifier switch- Rectifier +5 V preven- filter circuit circuit inlet circuit circuit tion Fuse circuit circuit Smooth- Rectifier +34 V circuit circuit Over- voltage detec- tion circuit Power stop PWSTOP control circuit Power supply unit Figure 5.41 Power supply block diagram...
  • Page 129 (3) Main voltage regulation switching (Figure 5.41 C) Table 5.2 Voltage regulation switching control Voltage Switching control Regulation control Frequency (4) Protection a. Primary circuit protection...
  • Page 130 b. Secondary circuit protection Overcurrent protection (OCP) Table 5.3 Overcurrent protection Voltage Overcurrent detection Protection Overvoltage protection (OVP) Table 5.4 Overvoltage protection Voltage Action...
  • Page 131 (5) External signal Power on AC input Power control failure PWSTOP +5 V +34 V Figure 5.42 PWSTOP signal...

  • Page 132: Firmware Overview

    5.4 Firmware Overview Epson ESC/P2 IBM Proprinter X24E/XL24E Digital PPL2 Level 1 interrupt Host interface Interpreter control group 1 control, control panel control Print inform- ation Level 2 interrupt Print control group Print request, paper feed request, etc. Base control group Level 3 interrupt (engine and interface control) Host...
  • Page 133 CHAPTER 6 RECOMMENDED SPARE PARTS FJ PARTS NO. PARTS DESC. LA36 Section tobe Remarks referred to...
  • Page 134 FJ PARTS NO. PARTS DESC. LA36 Section tobe Remarks referred to...

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