Epson LX-300+ Service Manual page 7

2.3.2 C294PSB / C294PSE Board ...................................................................... 58
2.3.2.1 Electric Circuit .................................................................................. 58
Chapter 3 Troubleshooting
3.1 Overview ............................................................................................................ 61
3.2 Troubleshooting ................................................................................................ 62
3.2.1 Initialization Check .................................................................................... 62
3.2.2 Check Performance By Self-Check Function ............................................ 62
3.2.2.1 Indicator LED .................................................................................... 62
3.2.3 Identify Problems From Symptoms ........................................................... 63
3.2.4 Unit and Parts Check ................................................................................. 66
3.2.4.1 Printhead Check ................................................................................ 66
3.2.4.2 Motor Check ...................................................................................... 67
3.2.4.3 Sensor Check ..................................................................................... 67
3.2.4.4 Printhead Driver Check ..................................................................... 68
Chapter 4 Disassembly and Assembly
4.1 Overview ............................................................................................................ 70
4.1.1 Precautions ................................................................................................. 70
4.1.2 Tools .......................................................................................................... 70
4.1.3 Service Checks After Repair ..................................................................... 72
4.2 Disassembly and Assembly .............................................................................. 73
4.2.1 Printhead Removal ..................................................................................... 74
4.2.2 Upper Housing Removal ........................................................................... 75
4.2.3 Printer Mechanism Removal ..................................................................... 76
4.2.4 Board Assembly and Panel Removal ........................................................ 78
4.2.5 C294MAIN/MAIN-B Board Assembly Removal ..................................... 78
4.2.6 C294 Power Supply Board Assembly Removal ........................................ 79
4.2.7 Printer Mechanism Disassembly ............................................................... 80
4.2.7.1 CR Motor Assembly Removal .......................................................... 81
4.2.7.2 Platen Removal .................................................................................. 81
4.2.7.3 Carriage Unit Removal ...................................................................... 82
4.2.7.4 Ribbon Feed Mechanism Removal ................................................... 84
4.2.7.5 RPE Sensor Removal ........................................................................ 84
4.2.7.6 BPE Sensor Removal ........................................................................ 84
4.2.7.7 HP Sensor Removal ........................................................................... 85
4.2.7.8 PG Sensor Removal ........................................................................... 85
4.2.7.9 Release Lever Position Sensor Removal ........................................... 85
4.2.7.10 PF Motor Assembly Removal ......................................................... 86
4.2.7.11 Paper Feed Mechanism Disassembly .............................................. 87
4.2.7.12 Paper Guide Removal ...................................................................... 88
Chapter 5 Adjustment
5.1 Overview ............................................................................................................ 91
5.1.1 Platen Gap Adjustment .............................................................................. 91
5.1.2 Bi-D Adjustment ........................................................................................ 92
Chapter 6 Maintenance
6.1 Maintenance ...................................................................................................... 99
6.1.1 Cleaning ..................................................................................................... 99
6.1.2 Lubrication ................................................................................................. 99
Chapter 7 Appendix
7.1 Connector Summary ...................................................................................... 104
7.1.1 Major Component Unit ............................................................................ 104
7.1.2 Pin Assignments ...................................................................................... 104
7.2 EEPROM Address Map ................................................................................ 107
7.3 Component Layout ......................................................................................... 111
7.4 Exploded Diagrams ........................................................................................ 115
7.5 Parts List ......................................................................................................... 119
7.6 Electric Circuit Schematics ........................................................................... 124