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EK-LQP02-PS-001
March 1982
76 pages
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Document:
LQP02 Printer Pocket Service Guide
Order Number:
EK-LQP02-PS
Revision:
001
Pages:
76
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EK-LQP02-PS-001 LQPO02 Printer Pocket Service Guide Prepared by Educational Services of Digital Equipment Corporation 1st Edition, March 1982 Copyright © 1982 by Digital Equipment Corporation. All Rights Reserved. The reproduction of this material, in part or whole, is strictly prohibited. For copy information, contact the Educational Services Depart- ment, Digital Equipment Corporation, nard, Massachusetts 01754. May- The information in this document is subject to change without notice. Digital Equipment Cor- poration assumes no responsibility for any errors that may appear in this document. Printed in U.S.A. The following are trademarks of Digital Equipment Corporation, Maynard, Massachusetts. DEC DECnet DECUS DIGITAL DECsystem-10 OMNIBUS OS/8 DECSYSTEM-20 PDT Digital Logo DECwriter RSTS PDP DIBOL RSX UNIBUS EduSystem VMS VAX IAS VT MASSBUS CONTENTS INTRODUCTION TESTING AND TROUBLESHOOTING VY PO VA i TP - e » - L Ed - 0 00 Q0 ~J - VG RO = o IO - et LD TP - ot » | SO pon. R B e O\?AMMM%MMM 1 General ........... .00t 1 CHECK Condition ...................... 1 Self-TestLevels ......................... 1 Self-Test Prerequisites .................... 2 Testing .....ccovviiiiiiiiiiiiiiiii. 3 Logic Self-Test ....................... 3 Printing Self-Test ..................... 4 Loopback Self-Test ................... 4 Self-Test with the Automatic Sheet Feeder (ASF) ... ... 5 ASF Self-Test Prerequisites . .............. 5 Testing withthe ASF .................... 7 Logic Self-Test with the ASF .......... 7 Printing Self-Test with the ASF ........ 7 Self-Test Troubleshooting Table ........... 8 General Troubleshooting Table ............ 11 Power Supply Voltage Check ............. 18 2 FRU REMOVAL AND REPLACEMENT General ....... . e 20 Front AccessCover ..........ccovvvunen.. 22 Rear Access Cover ...........cccivunnnn. 22 Power Supply PCB ...................... 25 Printed Circuit Boards .. .................. 26 Mechanical Subassembly ................. 28 .. 32 ... ... . i Motherboard ...... Electronic Subassembly .................. 32 Fan ... e 34 ........................ 35 Front Panel PCB Recommended Spares List for the LQPO2 ... 37 ww CONTENTS v 3 CLEANING AND LUBRICATION 3.1 3.2 4 General .............. . ... i 38 Felt Wiper Lubrication ................... 38 OPTIONS 4.1 4.3 General ...... ... .. i, ... 40 ASF Installation ......................... 40 ASF Troubleshooting Table .............. 46 4.4 ASF Removal and Replacement 4.4.1 4.4.2 4.4.3 Procedures ....................cooii.... 48 Left and Right Side Covers ............ 49 Front Access Cover Assembly ......... 49 Pinch Roller Assembly ................ 50 Control Unit PCB .................... 51 4.2 4.4.4 4.4.5 Rear Tray Drive Motor ................ 52 Front Tray Drive Motor ............... 54 4.4.6 4.5 ASF Adjustments .. ... P 54 4.5.1 4.5.2 4.6 4.7 4.8 4.9 Belt Adjustments ..................... 54 Encoder Disk Adjustment .............. 55 Control Unit PCB Jumpers ............... 55 Recommended Spares List for the ASF .... 55 Forms Tractor Installation .... 58 Bidirectional Forms Tractor Troubleshooting Table . ..... 59 A FUSE LOCATIONS B RELATED DOCUMENTATION C CONFIGURATION SWITCH PACKS D PHYSICAL/FUNCTIONAL DIAGRAM FIGURES 1-1 Self-Test Configuration Switch and Loopback Connectors ..o v v 2 1-2 Form Feed Switch ....................... 3 1-3 ASF with Loaded Trays .................. 5 1-4 Feeding the Paper ....................... 6 1-5 1-6 2-1 2-2 2-3 Card Cage Cover Removal ............... Power Supply PCB Voltage Test Points .... FRU Removal Sequence for the LQP02 .... Printer FRUs .................co0viii... Front Access Cover Removal ............. 18 19 2-4 20 21 23 Platen Removal .......................... 23 2-5 Rear Access Cover Removal .............. 24 2-6 Card Cage Cover Removal ............... 25 CONTENTS v 2-16 2-17 3-1 4-1 4-2 4-3 4-4 4-5 4-6 Power Supply PCB Removal .............. 26 Power Cord and Connector Locations ...... 27 PCBRemoval ..................cviiunn. 27 Ground Strap Locations ............. S 28 Motherboard Connector Locations ......... 30 Mechanical Subassembly Screws .......... 31 Mechanical Subassembly Removal ......... 31 Motherboard Connector Locations ......... 33 Motherboard and Card Cage Screw Locations ........covviviivininnnneennens 34 FanRemoval ............................ 35 36 Front Panel PCB Removal ................ Felt Wiper Lubrication ................... 39 Front Access Cover Inserts ............... 40 Mounting Bracket Installation ............. 41 Positioning the Alignment Guide .......... 42 ASF Installation ......................... 43 ASF Positioning Test .................... 44 Interface Cable Connections .............. 45 4-8 4-9 4-10 4-11 4-12 4-13 4-14 4-15 4-16 4-17 A-1 A-2 A-3 Paper Feed Path ......................... 47 FRU Removal Sequence for the ASF ...... 48 Side Cover Removal ..................... 49 Front Access Cover Removal ............. 50 Pinch Roller Assembly Removal ........... 51 Control Unit PCB Removal ............... 52 Drive Motor Connections ................. 53 Drive Motor Removal .................... 53 Control Unit PCB Jumper Locations ....... 56 Forms Tractor Installation ................ 38 AC Power Fuse Removal ................. 60 Digital PCB Fuse Locations .............. 61 Analog PCB Fuse and Enable Switch 2-7 2-8 2-9 2-10 2-11 2-12 2-13 2-14 2-15 4-7 Paper Feed Tray Installations ............. 45 Locations ..........coviiiirniinenennnnnn 61 A-4 C-1 C-2 D-1 Motherboard Fuse Location ............... 62 Configuration Switch Pack 1 .............. 64 Configuration Switch Pack2 .............. 65 Physical/Functional Diagram ............. 67 TABLES 1-1 1-2 2-1 4-1 4-2 4-3 4-4 Self-Test Troubleshooting Table ........... General Troubleshooting Table ............ Recommended Spares List for the LQPO2 ..... ... ASF Troubleshooting Table .............. Control Unit PCB Jumper Configuration ... Recommended Spares List for the ASF .... Forms Tractor Troubleshooting Table...... 8 12 37 46 56 57 59 INTRODUCTION The Guide | ; This guide describes the following topics on the LQP02 Printer. e Testing and troubleshooting to the field replaceable unit (FRU) e FRU removal and replacement e Cleaning and lubrication e Options Notes, Cautions, and Warnings Notes, Cautions, and Warnings in this guxde highlight specific information. Note Provides important additional information. Caution Provides information for pre- venting equipment damage. Warning Provides information venting personal injury. Vi for pre- INTRODUCTION vii The Product The LQPO2 is a full character, daisy wheel printer that operates from 120 Vac (60 Hz) and 220 Vac to 240 Vac (50 Hz). It can print various character fonts with interchangeable print wheels. The printer uses a ribbon drive system that accepts fabric and mylar ribbon in disposable operator-replaceable cartridges. The printer has a friction paper feeder, but it also supports the optional tractor and automatic sheet feeders. Tool Requirements Servicing the LQPO02 printer and its options requires the following tools. Tool DIGITAL PN Slotted screwdriver, 1/4 inch Slotted screwdriver, 3/16 inch 29-10983-00 29-10988-00 Phillips screwdriver, No. 2 29-11005-00 Nut driver, 1/4 inch (optional) 29-10664-00 Nut driver, 3/16 inch (optional) 29-10637-60 Nut driver, 5/16 inch (optional) Driver handle Needlenose pliers Ignition wrench set 29-10673-00 29-10562-00 29-10311-00 29-12577-00 TESTING AND TROUBLESHOOTING 1.1 GENERAL This chapter contains self-test and troubleshooting information. The self-test troubleshooting table can help you determine most printer malfunctions. An additional gen- eral troubleshooting table lists the most common LQP02 failures, probable causes, and corrective action. 1.2 CHECK CONDITION During a self-test routine or normal operation, the printer can enter a CHECK condition. This condition is a built-in safety mechanism that disables the high current devices on the printer. The printer enters CHECK when: e The print wheel or carriage motion is blocked, e The power supply voltage drops, or e The self-test fails. To determine if the printer is in CHECK, turn the platen knob while the power is on. If the platen rotates freely, the printer is in CHECK. (The printer error indicator should be on.) If platen rotation is detented (normal when power is on), the printer is not in CHECK. You can clear a CHECK condition caused by a temporary drop in the output voltage (often accompanied by a high-pitched whine) by turning off the power and then powering up the printer again. If the CHECK condition still exists, consult the troubleshooting tables. 1.3 SELF-TEST LEVELS The LQPO2 supports three levels of self-test. 1. Logic self-test 2. Printing self-test 3. Loopback self-test 2 TESTING AND TROUBLESHOOTING Use the configuration switch to place the printer in the self-test mode. To select the correct self-test, press the form feed switch on the front panel. Each time you press the form feed switch, the next level of self-test is entered. NOTE The printer automatically executes the logic self-test when powered up. 1.4 SELF-TEST PREREQUISITES Use the following procedure to prepare the printer for self-test operation. 1. With power off, insert one 8 1/2 inch X 11 inch sheet of paper. Make sure the 11 inch side is horizontal and the paper is as far to the left as possible. 2. Enable the self-test configuration switch (SP1, switch 12) by setting it to the down (0) position (Figure 1-1). SP1 1 AC POWER ON/OFF SWITCH g AC POWER PROTECTIVE LINE FUSE GROUND SWITCH POWER CONFIGURATION CORD SWITCH PACK NO.1 CONFIGURATION SWITCH PACK NO.2 120/240 VAC POWER SELECT paRALLEL gSHEET FEEDER CONNECTOR 37 PIN LOOPBACK CONNECTOR Figure 1-1 SERIAL EIA CONNECTOR 25 PIN LOOPBACK CONNECTOR MA-B426 Self-Test Configuration Switch and Loopback Connectors TESTING AND TROUBLESHOOTING 3 3. Remove all communication cable:s fmm rear of | printer (Figure 1-1). 4. Install the 25-pin loopback connector to EIA serial connector at rear of printer (Fxgure: 1-1). 5. Install the 37-pin loopback connector to parallel sheet feeder connector at rear of prmter (Fzgure 11). 6. Set power switch to ON (Fxgare 1-1). Carriage should move to left margin. 1.5 TESTING to start the three levels of Use the following procedures self-test in the order listed. 1.5.1 Logic Self-Test This test checks the RAM, (P)ROM and all loadable/readable registers on the processor bus for proper operation. NOTE | - Although the printer automatically executes the logic self-test upon power-up, you must per- form the following procedure to run the print| ing and loopback self-tests. 1. Press the form feed switch once (Figure 1-2). MA-B4AZ7 Figure 1-2 Form Feed Switch 4 TESTING AND TROUBLESHOOTING If the test passes, the printer error, paper out, ribbon out, and pause indicators on the front panel flash twice. If the test fails, the printer halts, enters CHECK, and the printing self-test cannot be performed. Refer to the self-test troubleshooting table for possible causes (Paragraph 1.9). 1.5.2 Printing Self-Test This test exercises the platen, carriage, print wheel, ham- mer and audible alarm. NOTE The logic self-test must be performed before the printing self-test. | 1. Press the form feed switch again (Figure 1-2). If the test passes, the alarm sounds and the print wheel spins. After an approximate 7 second pause, the carriage moves back and forth to each character position within the margins. The printer vert:cally prints the words “SELF TEST”in the left margin. It then horizontally prints a self-test pattern mcludxng each character on the print wheel. If the test fails, the printer halts, enters CHECK and the loopback self-test cannot be performed. Refer to the self-test troubleshooting table for possible causes (Paragraph 1.9). NOTE This test runs continuously. To halt it, turn off power or start the loopback self-test by pressing the form feed switch. 1.5.3 Loopback Self-Test This test checks the integrity of the serial and parallel line electronics with two loopback connectors. - NOTE - The printing self-test must be performed before the loopback self-test. Make sure the loopback connectors are in place (Paragraph 1.4). 1. Press the form feed switch again (Figure 1-2). The printer pauses, prints the data remaining in the buffer, and then performs the loopback self-test. TESTING AND TROUBLESHOOTING 5 If the test passes, the printer prints “I/O TEST PASSED.” If the test fails, the printer prints “I/O TEST FAILED.” Refer to the self-test troubleshooting table for possible causes (Paragraph 1.9). When finished testing, set the self-test configuration switch (SP1, switch 12) to the up (1) position (Figure 11) and remove the paper. Remove the loopback connectors and reconnect the communications cables to their respective connectors (Figure 1-1). 1.6 SELF-TEST WITH THE AUTOMATIC SHEET FEEDER (ASF) The LQP02 can perform the logic and printing self-tests with the ASF connected. The printer cannot perform the loopback self-test with the ASF connected. 1.7 ASF SELF-TEST PREREQUISITES Use the following procedure to prepare the printer for self-test operation with the ASF. 1. Make sure the front and rear trays are in place and loaded (Figure 1-3). MA-B4AZE Figure 1-3 ASF with Loaded Trays TESTING AND TROUBLESHOOTING . Insert one sheet of paper in the manual chute as far to the left as possible. Using the platen knob, ad- vance the paper until it feeds through the pinch rollers in the ASF (Figure 1-4). . Enable the self-test configuration switch (SPI, switch 12) by settmg it to the down (0) position (Fxgara 1- 1) . Set the power switch to ON (Figuré 1-1). The carriage should move to the left margin. MA-8429 Figure 1-4 Feeding the Paper TESTING AND TROUBLESHOOTING 7 1.8 TESTING WITH THE ASF Use the following procedures to start the two levels of self-test in the order listed. 1.8.1 Logxc Self-Test with the ASF This test checks the RAM, (P)ROM, and all load- able/readable registers proper operation. on the pmcesser bus for , : | 1. Press the form feed switch once (Figure 1-2). If the test passes, the printer error, paper out, ribbon out, and pause indicators on the front panel flash twice. If the test fails, the printer halts, enters CHECK, and the printing self-test cannot be performed. Refer to the self-test troubleshooting table for possible causes (Paragraph 1.9). 1.8.2 Printing Self-Test with the ASF This test exercises the platen, carrlage, print wheel ham» mer and audible alarm. NOTE The logic self-test must be performed before the printing self-test. 1. Press the form feed switch again (Figure 1-2). If the test passes, the alarm sounds and the print wheel spins. After an approximate 7 second pause, the carriage moves back and forth to each character p@sxtlon within the margins. The printer vemcaily prints the words “SELF TEST”in the left margin. It then horizontally prints a self-test pattern including each character on the print wheel. NOTE | During the printing self-test, the last few characters in the line print off the page due to the 8 1/2 inch paper size. Next, the ASF feeds one sheet of paper from the front tray and prints each character on the print wheel. Then the ASF feeds one sheet of paper from the rear tray and prints each character on the print wheel continuously until the form feed switch is pressed again or the power is turned off. 8 TESTING AND TROUBLESHOOTING 2. Press the form feed switch again (Figure 1-2). The printer pauses and then continues printing characters until the buffer is empty. The words “I/O TEST FAILED” print on the next line and the printer halts. If the test fails, the printer halts and enters CHECK. Refer to the self-test troubleshooting table fm' possible causes (Paragraph 1.9). When finished testing, set the self*test conf:guratzon switch (SP1, switch 12) to the up (1) position (Figure 11) and remove the paper. 1 9 SELF—-TEST TROUBLESHOOTING TABLE V | Table 1-1 is broken into three sections. Each section appears in order, according to self-test level. 1. Logic Self-Test Failure 2. Printer Self-TéSt Failure 3. Loopback Self-Test Failure The table lists the failure symptoms and the FRUs causing the failure in order of probability. To replace the malfunctioning FRU(s), use the referenced procedures. Table 1-1 Self-Test Troubleshooting Table Symptom | - Replace Logic Self-Test Failure All indicators are off but carriage restores (returns to left margin). Front panel PCB connector (Figure 2-17) Front panel PCB (Paragraph 2.10) SI controller PCB | (Paragraph 2.5) Power supply PCB (Paragraph 2.4) All indicators are off; camage AC line fuse (Appendix A) does not restore. Power supply PCB (Paragraph 2.4) Analog PCB (Paragraph 2.5) TESTING AND TROUBLESHOOTING Table 1-1 Self-Test Troubleshooting Table (Cont) Symptom Replace Digital PCB (Paragraph 2.5) SI controller PCB (Paragraph 2.5) Mechanical subassembly (Paragraph 2.6) Power indicator is on. Carriage restores. No indicators blink. SI controller PCB (Paragraph 2.5) Power supply PCB (Paragraph 2.4) Power indicator is on and front Fuse F1 on motherboard panel indicators blink, but carriage (Appendix A) does not restore. Printer error indicator is on. Analog PCB (Paragraph 2.5) Digital PCB (Paragraph 2.5) Printing Self-Test Failure Print wheel stops. Printer error Analog PCB indicator is on. Printer is in CHECK. (Paragraph 2.5) Digital PCB (Paragraph 2.5) Mechanical subassembly (Paragraph 2.6) Print wheel does not operate. Fuse F3 on analog PCB (Appendix A) Analog PCB (Paragraph 2.5) Digital PCB (Paragraph 2.5) SI controller PCB (Paragraph 2.5) Mechanical subassembly (Paragraph 2.6) 9 10 TESTING AND TROUBLESHOOTING Table 1-1 Self-Test Troubleshooting Table (Cont) Replace Symptom Printing Self-Test Failure (Cont) Carriage motion stops; printer is in CHECK. , Analog PCB (Paragraph 2.5) Carriage does not move. Digital PCB (Paragraph 2.5) Fuse F1 on motherboard (Appendix A) Momerboafd (Paragraph 2.7) Mechanical subassembly (Paragraph 2.6) Paper moves erratically or not Fuses F3 and/or F4 on at all. digital PCB (Appendix A) Digital PCB (Paragraph 2.5) Mechanical subassembly (Paragraph 2.6) Motherboard (Paragraph 2.7) Printer prints incorrect characters. : Fuse F3 on analog PCB (Appendix A) Analog PCB (Paragraph 2.5) Mechanical subassembly (Paragraph 2.6) Print wheel moves but does not print. Fuse F1 on analog PCB (Appendix A) Analog PCB (Paragraph 2.5) Mechanical subassembly (Paragraph 2.6) Print density is uneven. Ribbon TESTING AND TROUBLESHOOTING Table 1-1 11 Self-Test Troubleshooting Tabk (Ceat) Symptom | { fazpiaee Print wheel Fu‘se'ii?i or F3 on digital Mecha;iical subassembly (Paragraph 2.6) Loopback Self-Test Failure Printer prints “J/O TEST FAILED.” SI controller PCB (Paragraph 2.5) Power supply PCB (Paragraph :2.4) 1.10 GENERAL TROUBLESHOOTING TABLE This table lists the most common problems that can occur during LQP02 operation. Not all of the problems are related to an FRU failure, in fact, most usually are oper- ator- or accessory-related problems. A good visual inspection can solve many printer malfunctions. Alwaysinspect the printer for loose belts, proper switch positions, broken sensors, foreign objects (paper clips, paper shreds), loose screws or ground cables, etc. When troubleshooting a malfunction, be aware that the displayed symptoms can represent multiple failures. Always troubleshoot according to the current symptom. WARNING Turn off power before dlscomectmg or replac‘ing an FRU. To correct the common malfunctions, refer to the appropriate section in Table 1-2. The sections are labeled accordmg to the following types of malfunction. Power | Paper feed Ribbon feed Carriage motion Print wheel motion Hammer fire 12 TESTING AND TROUBLESHOOTING Table 1-2 General Troubleshooting Table Symptom Probable Cause Corrective Action Power Malfunctions No indication of No output from Set power switch to power to printer. power supply ON. All indicators are off. Fan is not Check for power at running, wall outlet. Check power cable connection. AC fuse is Replace ac fuse blown. (Appendix A). AC input cable is disconnected. power supply PCB Check connector J1 on (Figure 2-7). Power supply Check power supply voltages(Paragraph1.11). Replace power supply PCB (Paragraph 2.4). Printing stops or Access cover is does not start. open. Close access cover. Paper is out. Insert paper, Ribbon is out. Replace ribbon cartridge. Defective cover Check sensor cable interlock sensor- connector J14 on motherboard. Replace front access cover (Paragraph 2.2). Print wheel is not Reinstall print wheel. firmly in place. Printer is in Incorrect power Check power supply continuous or supply voltages voltages(Paragraph1.11). random CHECK. Replace power supply PCB (Paragraph 2.4). TESTING AND TROUBLESHOOTING Table 1-2 13 General Troubleshooting Table (Cagt) Symptom Probable C auisga “Corrective Action Paper Feed Malfunctions Paper feeds Fuses F3 and/or erratically or not F4 on digital at all. PCB are open. Paper feed driver transistors " Replace digital PCB (Paragraph 2.5). in paper feed Check paper feed motor “cable connector J6 on motor circuit motherboard. Open connection Defective paper feed motor Poor paper Check for shorted components and replace - fuse(s) (Appendix A). Replace mechanical sub~ assembly (Paragraph 2.6). No paper feed Verify paper feed in command self-test. Defective form feed switch (Paragraph 2.10). Dirty platen Clean platen. Replace front panel PCB registration Paper feed Replace mechanical sub- idler gear is - assembly ( Paragraph 2.6). unadjusted. Bent card guide Repair or replace card ‘guide. Paper out Defective paper indicator is on, out sensor but paper supply is okay. Open circuit in digital PCB “Replace mechanical sub- ‘assembly (Paragraph 2.6). Replace digital PCB (Paragraph 2.5). Defective paper Replace front panel PCB out indicator (Paragraph 2.10). Set switch 10 on SP1 to down (0) position. Paper supply is Switch 10 on empty but printing SP1 is set to continues. wrong position. Defective paper Check sensor cable J13 out sensor on motherboard. Replace mechanical sub- assembly (Paragraph 2.6). Short circuit in digital PCB Replace digital PCB ~ (Paragraph 2.5). 14 TESTING AND TROUBLESHOOTING Tablg 1~2 General Troubleshooting Table (Cont) Probable Cause Corrective Action Ribbop Feed Malfunctions Ribbon feeds erratically or not atall. Defective ribbon cartridge Replace ribbon cartridge. Fuses F1 and/or Check for shorted components and replace fuse(s) (Appendix A). F2 on digital PCB are open. driver transistors Replace digital PCB (Paragraph 2.5). Open connection in ribbon feed motherboard. Ribbon feed Check connection J5 on circuit Analog PCB Replace analog PCB (Paragraph 2.5). Ribben out Defective EOR Replace-EOR sensor, indicator is on, sensor but ribbon supply Replace mechanical subassembly ( Paragraph 2.6). is okay. Open circuit in digital PCB (Paragraph 2.5). Defective EOR indicator (Paragraph 2.10). Ribbon supply is Defective EOR empty but printing continues. sensor Replace digital PCB Replace front panel PCB Check EOR connector J16 on motherboard. Replace EOR sensor. Replace mechanical subassembly (Paragraph 2.6). Short circuit in Replace digital PCB digital PCB (Paragraph 2.5). Carriage Motion Malfunctions Carriage fails to Disabled move to left carriage servo margin upon Check position of switch S1 on analog PCB (Figure A-3). power-up. Fuse F1 on Check for shorted motherboard is components and replace open. fuse (Appendix A). TESTING AND TROUBLESHOOTING Table 1-2 15 General Troubleshooting Table (Cont) Symptom Probable Cause Defective Corrective Action Check efiagem J7 and carriage motor/ encoder or J15 on motherboard. . loose cable Replace mechanical sub- connections , assembly(Paragraph 2.6). Carriage driver ~ Replace zmtfi&;&oai'a transistors (Paragraph 2.7). Digital or Replace defécfive circuit analog PCB board (Paragraph 2.5). Broken or loose Tighten belt. pulley Replace mechanical sub- drive belt or assembly (Paragraph 2.6). Carriage crashes into side frame. Carriage driver Replace motherboard transistors (Paragraph 2.7). Defective Replace meéfianiéal sub- carriage motor Digital or analog PCB Uneven margins Defective or line spacing carriage motor/ encoder or loose cable connections Broken or loose drive belt or pulley assembly (Paragraph 2.6). Replace defective circuit board (Paragraph 2.5). Check connectors J7 and J15 on motherboard. Repiafie mfiéhanical sub- assembly (Paragraph 2.6). Tighten belt. Replace mecharical subassembly (Paragraph 2.6). SI controller, Replace defective circuit digital, or analog PCB board (Paragraph 2.5). Incorrect Run self-test. If self-test host system passes, check host system. commands 16 TESTING AND TROUBLESHOOTING Table 1-2 General Troubleshooting Table (Cont) Symptom PréEablé Cause Corrective Action Print Wheel Motion Maifuactifins | Print wheel fails to move and index Disabled print ‘Check position of switch wheel servo S3 on analog PCB (Figure A-3). Fuse F3 on open. Check for shorted components and replace fuse (Appendix A). Print wheel driver transistors Replace analog PCB (Paragraph 2.5). Defective print wheel servo or loose cable Check connectors J5 and J16 on motherboard. upon power-up. ~ analog PCB is ~ connections - Digital or analog PCB Replace mechanical subassembly (Paragraph 2.6). Replaée defective circuit board (Paragraph 2.5). Print wheel spins Print wheel Replace analog PCB continuously driver transistors (Paragraph 2.5). Defective print wheel servo or Check connector J5 on motherboard. upon power-up. Print wheel spins slowly after carriage restores. loose cable connection Replace mechanical subassembly (Paragraph 2.6). Digital or Replace defective circuit board (Paragraph 2.5). analog PCB Hammer Fire Malfunctions Hammer does not Disabled fire. hammer circuit Fuse F1 on analog PCB is open. Check position of switch S2 on analog PCB (Figure A-3). ‘Check for shorted components and replace fuse (Appendix A). Hammer driver Replace analog PCB transistor (Paragraph 2.5). TESTING AND TROUBLESHOOTING Table 1-2 17 General Troubleshooting Table (Cont) Symptom Probable Cause Corrective Action Defective Check connector J5 on hammer coil or motherboard. loose connection Replace mechanical subassembly (Paragraph 2.6). Digital or analog PCB Replace defective circuit board (Paragraph 2.5). Hammer fires but Copy control Reset copy control lever. prints poorly. lever is set incorrectly. Worn or dirty Replace or clean print wheel print wheel. Defective ribbon Replace ribbon cartridge. Print hammer Replace mechanical sub- mechanism is assembly (Paragraph 2.6). unadjusted. Hammer fires but Digital or Replace defective circuit analog PCB board (Paragraph 2.5). Hammer binding §Repla,ce mechanical sub- does not retract. assembly (Paragraph 2.6). Analog PCB Replace Analog PCB (Paragraph 2.5). 18 TESTING AND TROUBLESHOOTING 1.11 POWER SUPPLY VOLTAGE CHECK Use the following procedure to check the power supply voltages. 1. Remove the front access cover (Paragraph 2.2). 2. Remove the rear access cover (Paragraph 2.3). the card cage cover to reach the power sup3. Remove ply printed circuit board (PCB) (Figure 1-5). 4. Power up the printer. Using a digital multimeter, check the +5 Vdc, +15 Vdc, and —15 Vdc power supply outputs at the designated test points on the power supply PCB (Figure 1-6). The optimum indications should read as follows. If the voltages are incorrect or not present, replace the power supply PCB (Paragraph 2.4). e +5.1 Vdc at + 5 Vdc test point e +15.5 Vdc at +15 Vdc test point e —15.5 Vdc at —15 Vdc test point CARD CAGE COVER SCREWS REAR PANEL SCREWS Figure 1-5 Card Cage Cover Removal MA 8430 19 TESTING AND TROUBLESHOOTING POWER SUPPLY BOARD R ’ @ « MA -B4TT Figure 1-6 Power Supply PCB; Voltage Test Points FRU REMOVAL AND REPLACEMENT 2.1 GENERAL This chapter explains how to remove and replace the FRUs in the LQPO02. It also lists the recommended spares. Figure 2-1 shows the proceduresin performance order. Refer to Fxgure 2-1 for the correct sequence when re- moving or replacing FRUs. For example, you must first remove the front and rear access covers to remove the power supply board. Figure 2-2 shows the FRU locations on the printer. FRONT ACCESS COVER (PARA 2.2} l | FRONT PANEL l REAR ACCESS COVER {PARA 2.10} {PARA 2.3} l | PRINTED POWER SUPPLY CIRCUIT BOARDS PCB {PARA 2.5} {PARA 2.4) MECHANICAL SUBASSEMBLY {PARA 2.8} i ELECTRONIC SUBASSEMBLY | ! ?;gg:&zS?%OARD (PARA 2.8) FAN {PARA 2.9) MA.8327 Figure 2-1 20 FRU Removal Sequence for the LQP02 FRU REMOVAL AND REPLACEMENT 21 WARNING Make sure the power is off and the ac line cord is disconnected before removing an FRU. REAR FRONT ACCESS COVER ACCESS COVER POWER SUPPLY BOARD PRINTED CIRCUIT BOARDS MECHANICAL SUBASSEMBLY ELECTRONIC SUBASSEMBLY S 3“\&_ . \\\\‘ FRONT PANEL PCB MA-B4A3Z Figure 2-2 Printer FRUs 22 FRU REMOVAL AND REPLACEMENT 2.2 FRONT ACCESS COVER Use the following procedure to remove and replace the front access cover. . Turn power off. Lift each side of cover to release the two front balland-socket fasteners. Then pull cover straight out (Figure 2-3). . To replace the front access cover, reverse steps 1 and 2. 2.3 REAR ACCESS COVER Use the following procedure to remove and replace the rear access cover. 1. Remove front access cover (Paragraph 2.2). 2. Flip back the paper scale (Figure 2-4). 3. Remove platen by pressing platen release levers at each end of mechanical subassembly and lifting platen straight out (Figure 2-4). Loosen retaining screw on back of rear access cover with one quarter turn (Figure 2-5). Remove the two front screws at each side of cover (Figure 2-5). Lift cover to remove. . To replace the rear access cover, reverse steps | through 6. FRU REMOVAL AND REPLACEMENT 23 FRONT ACCESS COVER MA-8433 Figure 2-3 Front Access Cover Removal PAPER SCALE PLATEN RELEASE LEVERS MA-8434 Figure 2-4 Platen Removal oTM~ < FRU REMOVAL AND REPLACEMENT REAR ACCESS COVER SCREWS RETAINING SCREW MA.-8438 Figure 2-5 Rear Access Cover Removal FRU REMOVAL AND REPLACEMENT 2.4 25 POWER SUPPLY PCB Use the following procedure to remove and replace the power supply PCB. I. Remove rear access cover (Paragraph 2.3). 2. Loosen the two rear panel screws and five card cage cover screws (Figure 2-6). 3. Remove card cage cover by lifting it up and out. Allow the large holes in the cover to clear the screw heads (Figure 2-6). 4. Disconnect the input power cable from connector J1 on power supply PCB (Figure 2-7). 5. Pull the power supply PCB straight up to remove. 6. To replace the power supply PCB, reverse steps 1 through 5. NOTE When inserting the power supply PCB, line up the tabs on the PCB with the slots on the side of the card cage (Figure 2-7). The slots align the power supply PCB to its connector on the motherboard. | " CARD CAGE COVER SCREWS REAR PANEL SCREWS Figure 2-6 Card Cage Cover Removal MA-8430 26 FRU REMOVAL AND REPLACEMENT CIRCUIT BOARD TABS CONNECTOR J1 MA-8438 Figure 2-7 2.5 Power Supply PCB Removal PRINTED CIRCUIT BOARDS Use the following procedure to remove and replace the serial interface (Sl) controller, digital, and‘analog PCBs. I. Remove rear access cover (Paragraph 2.3). 2. Disconnect all cables from rear panel (Figure 2-8). 3. Loosen the two rear panel screws and five card cage cover screws (Figure 2-6). 4. Remove card cage cover by lifting it up and out. Allow the large holes in the cover to clear the screw heads (Figure 2-6). 5. Remove each PCB by lifting the mszde edges of the removal tabs (Figure 2-9). Then lift the PCB straight out of its connector via the guides (slots) on each side of card cage. 6. To replace the PCBs, reverse steps 1 through 5. FRU REMOVAL AND REPLACEMENT AC POWER CORD PARALLEL SERIAL SHEET FEEDER EIA CONNECTOR CONNECTOR 27 MA-BAZT7 Figure 2-8 Power Cord and Connector Locations REMOVAL TABS MA-8438 Figure 2-9 PCB Removal 28 2.6 FRU REMOVAL AND REPLACEMENT MECHANICAL SUBASSEMBLY Use the following procedure to remove and replace the mechanical subassembly. 1. Disconnect all cables from rear panel (Figure 2-8). 2. Remove power supply PCB (Paragraph 2.4). 3. Remove all PCBs (Paragraph 2.5). 4 Remove ribbon cartridge by pressing the red tabs N on cach side of cartridge and lifting it straight up. Free the ground strap on right side of mechanical subassembly by loosening the screw holding the strap to front panel (Figure 2-10). MA-B43Y Figure 2-10 Ground Strap Locations FRU REMOVAL AND REPLACEMENT 6. 29 Disconnect the second ground strap next to the encoder motor by loosening the retaining screw securing the strap to the mechanical subassembly (Figure 2-10). . Disconnect the third ground strap just behind the paper feed idler gear by loosening the retaining screw securing the strap to the mechamcal subassembly (Figure 2-10). . Disconnect the following cable connectors from motherboard (Figure 2-11). a. J9 (end of travel [EOT] sensor) b. JI15 (carriage encoder) c. J16 (print wheel encoder, end of ribbon [EOR] sensor) d. J7 (carriage motor) ¢. J6 (paper feed motor) f. J5 (ribbon feed motor, print wheel motor, hammer coil) . Position the left side of printer about 5 inches be- yond the edge of the desk or table. Remove the two mechanical subassembly screws from bottom of printer (Figure 2-12). Perform the same procedure for the right side of printer. . Grasp the square paper release shaft and round front carriage guide shaft (Figure 2-13). Lift the mechanical subassembly straight up and out of bottom cover. CAUTION Do not grasp the encoder motor te lift the mechanical subassembly. . To replace the mechanical subassembly, reverse steps 1 through 10. f 30 FRU REMOVAL AND REPLACEMENT J5 PRINTWHEEL J8 FRONT PANEL MOTOR, HAMMER COIL. RIBBON J9 EOT FEED MOTOR SENSOR NOT CONNECTED : OUT SENSOR J7 CARRIAGE | ry J14 COVER MOTOR [{Q o ° ’[ ol /. le o J22 FAN OFF SENSOR 4. o J15 CARRIAGE J16 ENCODER PRINTWHEEL ENCODER EOR SENSOR MA-8440 Figure 2-11 Motherboard Connector Locations FRU REMOVAL AND REPLACEMENT 31 TABLE MECHANICAL SUBASSEMBLY SCREWS Figure 2-12 MA-8441 Mechanical Subassembly Screws FRONT CARRIAGE GUIDE SHAFT MA 8447 Figure 2-13 Mechanical Subassembly Removal 32 FRU REMOVAL AND REPLACEMENT 2.7 MOTHERBOARD Use the following procedure to remove and replace the motherboard. 1. Remove mechanical subassembly (Paragraph 2.6). 2. Disconnect the remaining cables from motherboard (Figure 2-14). a. J22 (fan) b. J8 (front panel PCB) c. J14 (cover off sensor) 3. Remove the two screws securing the heat sink to card cage (Figure 2-15). 4. Remove the 11 screws securing the motherboard to the bottom of card cage (Figure 2-15). 5. Lift the motherboard out of card cage. 6. To replace the motherboard, reverse steps | through 5. CAUTION Do not overtighten motherboard screws. 2.8 ELECTRONIC SUBASSEMBLY Use the following procedure to remove and replace the electronic subassembly. I. Remove mechanical subassembly (Paragraph 2.6). 2. Disconnect the following cables from motherbaard (Figure 2-14). a. J8 (front panel PCB) b. J14 (cover off sensor) 3. Remove the four card cage screws securing card cage to bottom cover (Figure 2-15) and lift card cage out. 4. To replace the electronic subassembly, reverse steps 1 through 3. FRU REMOVAL AND REPLACEMENT J5 PRINTWHEEL 33 J8 FRONT PANEL MOTOR, HAMMER COIL. RIBBON J9 EOT SENSOR FEED MOTOR NOT CONNECTED OUT SENSOR J7 CARRIAGE J14 COVER MOTOR K‘E o O | O J22 FAN [¢ OFF SENSOR A ) | J15 CARRIAGE J16 ENCODER PRINTWHEEL ENCODER EOR SENSOR MA-B440 Figure 2-14 Motherboard Connector Locations FRU REMOVAL AND REPLACEMENT 34 CARD CAGE SCREWS HEAT SINK SCREWS MOTHERBOARD SCREWS (11) " CARD CAGE SCREWS MA 8443 Figure 2-15 Motherboard and Card Cage Screw Locations Use the following procedure to remove and replace the fan. 1. 2. Remove electronic subassembly (Paragraph 2.8). Disconnect the fan cable (J22) from motherboard L (Figure 2-14). Remove the three screws securing fan to card cage and disconnect ground strap (Figure 2-16). . Lift the fan straight up through the opening in card cage. . To replace the fan, reverse steps 1 through 3. CAUTION When installing the fan, face the label on the fan to the inside of the card cage for correct air flow direction. FRU REMOVAL AND REPLACEMENT 35 GROUND STRAP FAN SCREWS MA-B444 Figure 2-16 Fan Removal 2.10 FRONT PANEL PCB Y Use the following procedure to remove and replace the front panel PCB. I. Remove front access cover (Paragraph 2.2). 2. Disconnect the cable from front panel PCB (Figure 2-17). 3. Remove the four screws securing the front panel to bottom cover (Figure 2-17). Note ground strap location. 4. Lift the front panel out of bottom cover and place the panel face down on a flat, protective surface. 5. Remove the six screws securing the PCB to front panel and remove board (Figure 2-17). 6. To replace the front panel PCB, reverse steps 1 through 3. CAUTION Do not overtighten PCB screws. 36 FRU REMOVAL AND REPLACEMENT ~ PRINTED CIRCUIT BOARD SCREWS CABLE CONNECTOR [ VA FRONT PANEL SCREWS MA-8445 Figure 2-17 Front Panel PCB Removal FRU REMOVAL AND REPLACEMENT 37 2.11 RECOMMENDED SPARES LIST FOR THE LQP02 Table 2-1 lists the recommended séares and their part numbers for the LQPO2. Table 2-1 Recommended Spares List for the LQP02 Description DIGITAL PN Mechanical subassembly SI controller PCB 29.2402800 Digital PCB Analog PCB Power supply PCB Platen Motherboard Front panel PCB Inverter fan : Miscellaneous hardware kit* Serial line loopback connector * Includes fuses. Vendor PN ........ 29-24029-00 90714-01 292403200 91372-01 29-24030-00 29-24031-00 29-24033-00 91162-02 91174-01 ........ 29-24034-00 29-24035-00 90716-01 90718-01 29-24036-00 29-24046-00 12-15336-01 ........ ........ ........ CLEANING AND LUBRICATION 3.1 GENERAL l ‘ The operator is respon51ble for perforrflmg the cleaning and lubrication procedures regularly. Installing and Using the LQPO02 Full Character Printer (AA—L662A=—TK) describes these procedures. When servicing the printer you can check the twa felt wipers on the front carriage guide for excessive contamination. The wipersshould be oiled at least once a year. Oiling frequency depends on the operating environment (office, computer room, etc.), application (high or low usage), and supplies (type of paper used, etc.) 3.2 FELT WIPER LUBRICATION Use the following procedure to lubricate the felt wipers. 1. Remove front access ccvef (Paragraph 2.2). 2. Lubricate felt wipers on left and right side of rear carriage guide shaft with apprcximately 20 drops of lightweight electronic oil on each wiper (Figure 31). The wipers are kept next to the carriage by metal wiper brackets. You do not have to remove the wipers to lubricate them. NOTE If the wipers are ex*céssively caiitammated they must be replaced. Return the entire mechanical subassembly to your depot for repair. 3. Replace front access cover (Paragraph 2.2). 38 CLEANING AND LUBRICATION 39 FELT WIPERS MA-B448 Figure 3-1 Felt Wiper Lubrication 4 OPTIONS 4.1 GENERAL 4.2 ASF INSTALLATION This chapter includes servicing information for the LQPX2-AC Automatic Sheet Feeder (ASF) and the LQPX2-AA Bidirectional Forms Tractor. For more information, see the related documentation (Appendix B). Use the following procedure to install or remove the ASF and its mounting bracket. 1. Remove front access cover from printer (Paragraph 2.2). Remove the two cover inserts (Figure 4-1). 2. Slide the three bail bar rollers to extreme right (Figure 4-2). Leave bail bar away from platen. 3. Lower the mounting bracket onto printer until selfloading latches lock onto the platen shaft (Figure 42). Place bail bar against platen. MA-8447 Figure 4-1 40 Front Access Cover Inserts OPTIONS 4. 41 Position the alignment guide over front and rear bracket rails and against left side plate of bracket (Figure 4-3). a. Make sure both positioning collars fit into the rear alignment guide slots. b. Make sure the drive gear meets the alignment ~ guide front notch. o 5. If the collars or drive gear need adjusting, loosen the screws to move them. Once they are in the correct position, tighten the screws and remove the alignment guide. PLATEN SHAFT : “ SMALL GEAR IS PLATEN SHAFT MA-B448 Figure 4-2 Mounting Bracket Installation OPTIONS 42 POSITIONING COLLARS MOUNTING BRACKET DRIVE GEAR MA-BA4E Figure 4-3 Positioning the Alignment Guide Place the rear of the ASF on the mounting bracket. Make sure the collars on the rear bracket rail are to the inside of the ASF side covers (Figure 4-4). Lower the front of the ASF until the hook latch en- ~ gages the front bracket rail. Make sure the feeder drive gear engages with the mounting bracket gear ) (Figure 4-4). Check the ASF by rotating the platen knob back and forth. The ASF is properly positioned if the pinch rollers in the output hopper turn as the platen | rotates (Figure 4-5). Connect the 25-pin female end of the interface cable to rear connector of ASF and the 37-pin male end to sheet feeder connector on back of printer (Figure 4-6). | , Add paper to paper feed trays. Lower front tray all the way down into the first slot behind output hopper (Figure 4-7). Push back on top of the tray to lock into operating position. Load rear paper feed tray in the same manner. 11. 12. Install front access cover. To remove the ASF and mounting bracket, reverse steps 1 through 11. 43 OPTIONS - FRONT REAR ~ BRACKET RAIL BRACKET F adu i R T eg g g 2 RAIL POSITIONING COLLARS FEEDER DRIVE GEAR MOUNTING BRACKET \ DRIVE GEAR HOOK LATCH MA-8450 )7 ¥ Figure 4-4 ASF Installation 44 OPTIONS PINCH ROLLERS MA 8451 Figure 4-5 ASF Positioning Test OPTIONS 37 PIN MALE CONNECTOR 25 PIN FEMALE CONNECTOR Figure 4-6 45 MA-B452 Interface Cable Connections FRONT FEED TRAY OUTPUT HOPPER MA 8453 Figure 4-7 Paper Feed Tray Installations 46 OPTIONS 4.3 ASF TROUBLESHOOTING TABLE Before troubleshooting the ASF, perform the printer self-tests (Paragraph 1.5) with the ASF disconnected. If the printer passes the tests, visually check the ASF with the side covers removed. Are the belts loose or cut? Do the encoder disks rotate freely? Are all connectors firmly in place? Then use Table 4-1 to troubleshoot the ASF. Table 4-1 ASF Troubleshooting Table Symptom Probable Cause Pickup rollers Paper feed tray are turning but Corrective Action Place feed tray in operating position. not feeding paper. Load paper correctly. Clear paper feed path (Figure 4-8). Pickup rollers are not turning Drive mechanism Adjust drive belts (Paragraph4.5.1). Control unit PCB (Paragraph 4.5.2). and feeding paper. Drive motor(s) Adjust encoder disks Check connections on drive motors (Figure 4.14). Check drive motor connector on control unit PCB (Figure 4-13). Replace drive motor(s) (Paragraphs 4.4.5 and 4.4.6). Paper is fed but Paper jam Clean platen and bail bar rollers. does not reach output hopper. Clear paper feed path (Figure 4-8). Incorrect paper Use paper 8-1/2 inches size" wide for nonadjustable trays. Bail bar Position bail bar and bail bar rollers correctly. Loose mounting Engage gears properly and bracket gear tighten (Paragraph 4.2). OPTIONS Table 4-1 47 ASF Troubleshooting Table (Cont) Symptom Probable Cause Corrective Action Pinch roller Replace pinch roller assembly assembly (Paragraph 4.4.3). Pinch roller | Replace belt. assembly belt Too much paper Encoder disk | Adjust encoder disk is fed to platen. (Paragraph 4.5.2). Control unit PCB Replace control unit PCB (Paragraph 4.4.4). Noisy pinch Bent front cover Straighten front cover rollers. assembly assembly. Replace front cover assembly (Paragraph 4.4.2). FRONT PAPER FEED REAR PAPER FEED TRAY TRAY MANUAL FORM INSERTION CHUTE PICK-UP ROLLERS QUTPUT HOPPER OUTPUT \\ %; / O ’l o -".—n "ffi INSERTION ROLLERS PINCH ROLLERS REAR BRACKET RAIL FRONT BRACKET RAIL PRINTER PLATEN TRANSPORT ROLLER Figure 4-8 MA 8462 Paper Feed Path 48 OPTIONS 4.4 ASF REMOVAL AND REPLACEMENT | PROCEDURES | This section describes how to remove and replace the ASF. Figure 4-9 shows the FRUs on the ASF and the sequence in which to perform the removal and replacement procedures. For example, you must first remove the right side cover to remove the rear paper feed tray drive motor. NOTE Before performing the following procedures, remove the ASF from the printer (Paragraph 4.2). LEFT SIDE COVER (PARA 4.4.1) RIGHT SIDE COVER {(PARA 4.4.1) | I CONTROL UNIT PCB REAR TRAY DRIVE MOTOR FRONT TRAY DRIVE MOTOR (PARA 4.4.4) (PARA 4.4.5) (PARA 4.4.6) i FRONT ACCESS COVER ASSY. | (PARA4.4.2) PINCH ROLLER ASSEMBLY (PARA 4.4.3) MA-8328 Figure 49 FRU Removal Sequence for the ASF OPTIONS 4.4.1 49 Left and Right Side Covers Use the following procedure to remove and replace the right and left side covers. 1. Place the ASF on a table or flat surface in its normal upright position (Figure 4-10). Remove the left or right side cover by loosening the four retaining screws and pulling the cover straight out (Figure 4-10). 3. To replace the side covers, reverse steps 1 and 2. 4.4.2 Front Access Cover Assembly Use the following procedure remove and replace the front access cover assembly. 1. Remove 44.1). left | and right side covers (Paragraph Remove the two front access cover mounting screws and washers. Lift off the cover and deflector plate (Figure 4-11). To replace the front access cover assembly, reverse steps 1 and 2. RETAINING SCREWS MA-B454 Figure 4-10 Side Cover Removal OPTIONS 50 ‘\gYo 2 \;‘_____ PLASTIC DEFLECTOR PLATE FRONT ACCESS COVER MOUNTING SCREWS Figure 4-11 4.4.3 MA-B4BS Front Access Cover Removal Pinch Roller Assembly Use the following procedure to remove and replace the pinch roller assembly. 1. Remove front access cover assembly (Paragraph 4.4.2). 2. Remove the retaining screw from each side of pinch roller assembly (Figure 4-12). 3. Remove the plate and the pinch roller assembly by slipping pinch rollers down through slots in output hopper. | 4. To replace the pinch roller assembly, reverse steps 1 through 3. NOTE Position the ASF upside down to replace the pinch roller assembly easily. This position allows you to align the pinch roller assembly (bottom) and paper guide plate (middle) with the support plates (top) (Figure 4-12). 51 SUPPORT PLATE PAPER GUIDE PLATE O [ (. ag—— A Wy 3 OPTIONS PINCH ROLLER ASSEMBLY RETAINING SCREWS Figure 4-12 4.4.4 MA-8456 Pinch Roller Assembly Removal Control Unit PCB Use the fellowmg precedure to remove and replace the cantrel unit PCB. 1. Remove left side cover (Paragraph 4.4.1). 2. Disconnect drive motor connector from PCB (Figure 4-13). Remove the four mounting screws and washers from PCB (Figure 4-13). Carefully lift the control unit PCB straight up to clear the two encoder disks. CAUTION The encoder disks are fragile and bend easily. . To replace the control unit PCB, reverse steps 1 through 4. Adjust the encoder disks if necessary (Paragraph 4.5.2). 52 OPTIONS MOUNTING DRIVE MOTOR SCREWS CONNECTOR MOUNTING SCREWS ENCODER DISK HUB MA-B4B7 Figure 4-13 4.4.5 Control Unit PCB Removal Rear Tray Drive Motor | | Use the following procedure to remove and replace the rear tray drive motor. 1. - Remove right side cover (Paragraph 4.4.1). 2. Remove the green (4) and brown (—) ccnnelcters from drive motor by pulling them straight out (Fig| ure 4-14). Remove the rear tray drive motor belt by loosening the idler screw and slipping the belt off the gears (Figure 4-15). Remove the two rear tray drive motor mounting screws and flat washers. Lift motor from chassis (Figure 4-15). To replace the rear tray drive motor, reverse steps 1 through 4. OPTIONS 53 en -BROWN | S \ - RED FRONT DRIVE MOTOR REAR DRIVE MOTOR MA-B458 “l /.f f | REAR REAR MOTOR DRIVE {DLER SCREW DRIVE MOTOR MOUNTING SCREWS MOUNTING SCREWS FRONT DRIVE MOTOR IDLER SCREW Figure 4-15 PINCH ROLLER DRIVE BELT ya sase Drive Motor Removal 54 OPTIONS 4.4.6 Front Tray Drive Motor | Use the following procedure to remove and replace the front tray drive motor. I. Remove right side cover (Paragraph 4.4.1). 2. Remove the blue (+) and red (—) connectors from drive motor (Figure 4-14). 3. Remove the front tray drive motor belt by loosening the idler screw and slipping the belt off the gears (Figure4-15). 4. Remove the two front tray drive motor mounting screws and flat washers. Lift motor from chassis ' (Figure 4-15). 5. To replace the front tray drive motor, reverse steps 1 through 4. 4.5 ASF ADJUSTMENTS This section describes how to adjust the drive belts and | encoder disks on the ASF. e 4.5.1 Belt Adjustments Use the following procedure to adjust the front and rear tray drive motor belts. NOTE The pinch roller drive belt is not adjustable. I. Remove right side cover (Paragraph 4.4.1). 2. Loosen the drive motor idler screw for the belt you are adjusting (Figure 4-15). 3. Position the idler screws so there is no slack in belt and tighten screw. NOTE To prevent excessive wear and provide smooth operation, do not overtighten the drive belt tension. 4. Replace side cover. OPTIONS 55 4.5.2 Encoder Disk Adjustment Use the following procedure to adjust the encoder disks. CAUTION | The encoder disks are fragile and bend easily. . Remove left side cover (Paragraph 4.4.1). Using a 1.5 mm Allen wrench, loosen the set screw on left encoder disk hub (Figure 4-13). Set the gap between the encoder disk and pickup as small as possible and tighten the set screw. Perform steps 2 and 3 for the right encoder disk. Carefully rotate the encoder disks one complete revolution to be sure they do not touch the pickups. If they touch, perform steps 2 and 3 again. 6. 4.6 Replace side cover. CONTROL UNIT PCB JUMPERS The control unit PCB has 12 jumpers which are factory installed. Never change these jumpers. However, some of the jumpers are spring-loaded and can accidentally be changed. Figure 4-16 shows the jumper locations and Table 4-2 lists the factory configuration. 4.7 RECOMMENDED SPARES LIST FOR THE ASF Table 4-3 lists the recommended spares and their part numbers for the ASF. 56 OPTIONS SPRING-LOADED JUMPER w10 w9 ws - MA-8480 Figure 4-16 Control Unit PCB Jumper Locations Table 4-2 Control Unit PCB Jumper Configuration Jumper Configuration Jumper See note W7 Wi Installed Installed Removed Removed Removed W2 W3 W4 W35 W6 W8 W9 W10 Wil W12 Configuration -~ Installed Installed Removed Removed Removed Removed NOTE W1 can either be installed or removed depending on the version of the control unit PCB. IfW1 is installed, it is soldered in place. If W1 is removed, it is a springloaded jumper (open). ¥ OPTIONS Table 4-3 Recommended Spares List for the ASF Description " DIGITAL PN Sheet feeder swap unit 29-23846-00 Front cover assembly 29-23848-00 Paper holder Feed tray support, left side - 29-23849-00 - 29-23850-00 Cable assembly 29-23851-00 15 Vdc motor assembly with gear Gear wheel, transport roller shaft 29-23852-00 Pinch (eject) roller assembly 29-23854-00 Control unit PCB Timing disk 29-23853-00 o - 29-23855-00 29-23856-00 Feed tray support, right side Idle pulley, timing belt Pos, 10 29-23857-00 29-23858-00 Gear wheel assembly, one way clutch 29-23859-00 Arbor, one way clutch 29-23860-00 Timing belt (t = 114) - 29-23861-00 Timing belt (t = 80) Timing belt (t = 48) 29-23863-00 29-23862-00 Gear wheel Gear wheel Idler pulley 29-23866-00 Gear wheel Gear wheel, straight fluted 29-23868-00 29-23864-00 29-23865-00 29-23867-00 Gear wheel, drive shaft Notch arm right Notch arm left 29-23869-00 29-23872-00 29-23873-00 Kit of metric hardware Kit of springs 29-23870-00 ' 29-23871-00 Mounting bracket Paper feed tray, 8.5 in X 11 in 29-24072-00 « Paper feed tray, DIN A4 size (Europe) - 29-23874-00 29-23875-00 Paper feed tray, 8.5 in X 14 in Paper chute, DIN A4 size (Europe) 29-23877-00 Paper chute, 8.5 in Output stacker plate 29-23879-00 Interface cable 29-24073-00 Alignment guide 29-24074-00 Special Tool 1.5 mm hex key 29-23876-00 29-23878-00 | 29-19895-00 58 OPTIONS 4.8 BIDIRECTIONAL FORMS TRACTOR INSTALLATION Use the following procedure to install or remove the bidi| rectional forms tractor. I. Remove front access cover from printer (Paragraph 2.2). Remove the two cover inserts (Figure 4-1). 2. Lower the tractor into position on printer and align the slots in tractor arms with the platen shaft (Fig| ure 4-17). 3. Rotate the platen knob back and forth to check for free up-and-down movement of the tractor pins. The tractor gear should engage smoothly with the small platen gear (Figure 4-17). 4. To remove the forms tractor, reverse steps | | through 3. SMALLf PLATEN GEAR D S @ \\ NN MA-B481 Figure 4-17 Forms Tractor Installation OPTIONS 59 4.9 FORMS TRACTOR TROUBLESHOOTING TABLE Use Table 4-4 to troubleshoot the forms tractor. Since the forms tractor has no FRUs, the table lists adjustments only. Replace the entire tractor if it is defective. Table 4-4 Forms Tractor Troubleshooting Table Symptom Poor line spacing Printed lines slant. Pmbabie Cause Corrective Action Tractor is Reinstall tractor. Make installed sure tractor gear engages improperly. properly with platen gear. Paper is installed = Reinstall paper. improperly. Paper buckles Paper gates Reposition paper gates diagonally or pulls are positioned and lock in place. off tractor pins. incorrectly. Paper is too loose Tension lever is or too tight in set incorrectly. vertical direction (holes out of round). Reset paper tension lever. A FUSE LOCATIONS Figure A-1 shows how to remove the ac power fuses. Figures A-2 through A-4 show the fuse locations on the PCBs. Remove and insert the pico fuses with a pair of needlenose pliers. Do not solder a fuse in place. NOTE All fuses are in the miscellaneous hardware kit (DIGITAL PN 29-24046-00). 120 VAC OPERATION=3A FUSE 240 VAC OPERATION=1.6A FUSE MA-B4E3 Figure A-1 60 AC Power Fuse Removal APPENDIXES 61 PAPER FEED MOTOR F4,5A F3,5A i 1 I \l /Ju F1,1A F2, 1A RIBBON FEED MOTOR MA-B4AB4 Figure A-2 Digital PCB Fuse Locations ENABLE i o HAMMER CARRIAGE PRINTWHEEL DISABLE DISABLE DISABLE F1,5A F3, 2A HAMMER PRINTWHEEL MOTOR MA-B465 Figure A-3 Analog PCB Fuse and Enable Switch Locations 62 APPENDIXES o] L 10 CARRIAGE MOTOR FUSE F1,5A MA-B46E Figure A-4 Motherboard Fuse Location RELATED DOCUMENTATION This appendix lists documents related to the LQP02 printer. | The LQPO2 Technical Manual (ER-LQP02-TM-001) describes the LQPO2 to a detailed block level. It includes schematics, troubleshooting information, and adjust~ments for depot-level repair. Installing and Using the LQP02 Full Character Prin- ter (AA-L662-TK) describes how to install and operate the LQPO2. It includes operator troubleshooting and maintenance procedures, and a section on the system configuration switches. ' Replacing LQPO2 Print Wheels and Ribbon Cartridges (AV-L661A-TK) describes how to install the paper, ribbon cartridge, and print wheel. Installing and Using the LQPX2-AA Bidirectional Forms Tractor (AA-663A-TK) describes how to install and remove the LQPX2-AA bidirectional forms tractor. It also describes how to insert and remove paper and includes an operator troubleshooting section. Installing and Using the LQPX2-AC Automatic Sheet Feeder (AA-L882A-PA) describes how to install and remove the LQPX2-AC automatic sheet feeder. It includes operation, maintenance, and troubleshooting information. 63 CONFIGURATION SWITCH PACKS SP1 SWITCH POSITIONS | PARITY 7 8 0 |0 | mank 1 SELF TEST | o | spAce ENABLE =0 MODEM \! RESTRICTED=0 FULL=1 PARITY SELECT CONTROL ' PAPER OUT ENABLE =0 DISABLE =1 e 2 R R 3 4 T 5 T 6 —7 R 7 8 9 7 ] 1t T J e | W 10 11 12 \ BAUD STOP BIT RECEIVE LINE .STATUS INHIBIT RATE SELECT SIG. DET. ENABLE =0 SELECT 1BIT=0 2 SEC=0 DISABLE =1 2 BIT=1 60MS=1 SP1 SWITCH POSITIONS 1 2 | 3| 4 o|l 11 ol 1 ol o}l 0}l 0] 1o} 11 0] o o0 o 0 1 o] 1 0| 1 1 0 0 o] o 1 0} o 11 1 11 o 0] 110 | o] 1 1 1 1 0 o} o] o0| 0] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 1 BAUD RATE | TRANSMIT | RECEIVE 75 75 110 1345 600 1200 110 1345 150 SWITCH PACK 1 200 300 600 200 300 600 (SP1) 150 1200 1800 2000 2400 3600 4800 7200 9600 1200 1800 2000 2400 3600 4800 7200 9600 MA-BA4E7 Figure C-1 64 Configuration Switch Pack 1 APPENDIXES POSITION 1 = DISABLE FUNCTION POSITION 0 = ENABLE FUNCTION SWITCH PACK 2 (SP2) TRANSMIT DATA ENABLE ONPIN 2 TRANSMIT BACKWARD CHANNEL DATA ON PIN 14 TRANSMIT BACKWARD LINE SIGNAL ON PIN 19 REQUEST TO SEND FDNP1N4 1 r" 11 0 e o] o SN N SIS D 1 2 3 B ] r_ ) B Bl ] e SO S WO E SR N S R S 4 5 RTS OFF LEVEL 7 8 ] ON PIN 4 READY FOR SENDING 6 _ ONPIN 5 BACKWARD CHANNEL FOR SENDING ONPIN 13 DATA RATE SELECT ON PIN 23 MA-8488 Figure C-2 Configuration Switch Pack 2 65 PHYSICAL /FUNCTIONAL DIAGRAM MECHANICAL SUBASSEMBLY 9 P/N 29-24028 PRINTWHEEL RIBEON COIL FEED MOTOR , I - | CARRIAGE MOTOR FEED PAPER MOTOR CARRIAGE ENCODER COVER OFF PAPER OUT EOT SENSOR 1 SENSOR SENSO R PRINTWHEEL EOR SENSOR ’ ?_ W " FRONT CONTROL PANEL FRONT PANEL PCB DEC P/N 29-24035 VENDOR P/N 90718-01 FAN P/N = 29-24036 ] J5 J6 J7 ENABLE J22 J8 J9 J13 | J14 S J1s | Jie g1 e, S2 s3 ANALOG PCB | yB -———— —H A F1t—-1 DEC P/N 29-24031 VENDORP/N9117401 ~ - 51 CARRIAGE DISABLE S2 HAMMER DISABLE | S3PRINTWHEEL DISABLE DIGITAL PCB DEC P/N 29-24030 VENDOR P/N 91162 -02 -— 1 12 I 138 MOTHERBOARD DEC P/N 29-24034 — - —_————— e — VENDOR P/N 90716-01 O ! [ 4 | | 1 - {37 1 ] l FUSE ! 240 120 POWER SUPPLY BOARD DEC P/N 29-24032 VOLTAGE VENDOR P/N 91372-01 | oA | L — ] CONTROLLER PCB SERIAL INTERFACE DEC P/N 29-24029 VENDOR P/N 90714-01 3] PROTECTIVE GROUND SWITCH =" o\ oo UP=GROUND ELECTRONIC SUBASSEMBLY A &:Ifi Figure D-1 Physical/Functional Diagram 67
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