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CHAPTER 3
DISASSEMBLY AND ASSEMBLY
3.1 OVERVIEW ............................................................................................................3-1
3.1.1 Precautions for Disassembly and Assembly....................................................................... 3-1
3.1.2 Tools ........................................................................................................................................ 3-3
3.1.3 Specification for Screws........................................................................................................ 3-5
3.1.4 Service Checks After Repair.................................................................................................. 3-6
3.2 DISASSEMBLY AND ASSEMBLY.........................................................................3-7
3.2.1 ROM Replacement.................................................................................................................. 3-8
3.2.2 Printhead and Ribbon Mask Assembly Removal ................................................................ 3-9
3.2.3 Housing Removal ................................................................................................................. 3-13
3.2.3.1 Top Cover Removal................................................................................................. 3-13
3.2.3.2 Left, Right, and Front Covers Removal and Fuse Replacement............................. 3-14
3.2.3.3 Front Panel Unit Removal ....................................................................................... 3-16
3.2.3.4 Upper Case Removal.............................................................................................. 3-17
3.2.4 Circuit Boards Removal....................................................................................................... 3-18
3.2.4.1 Bottom Panel Assembly Removal........................................................................... 3-18
3.2.4.2 Cooling Fan and C204 Power Supply Board Unit Removal .................................... 3-21
3.2.4.3 C204 SUB Board Unit Removal .............................................................................. 3-22
3.2.4.4 C204 DRV-B and C204 DRV Board Units Removal ............................................... 3-23
3.2.4.5 C204 MAIN Board Unit Removal............................................................................. 3-24
3.2.4.6 AC Inlet Removal .................................................................................................... 3-26
3.2.4.7 C204 PNL Board Removal...................................................................................... 3-27
3.2.5 Interlock Switch and Cover Open Sensor Assembly Removal........................................ 3-28
3.2.6 Printer Mechanism Removal................................................................................................3-29
3.2.6.1 Fan Removal........................................................................................................... 3-31
3.2.6.2 Ribbon Feed Change Lever Unit Removal.............................................................. 3-32
3.2.6.3 Tractor Select Lever (Upper and Lower) Assembly Disassembly........................... 3-34
3.2.6.4 Ribbon Jam Sensor Removal.................................................................................. 3-35
3.2.6.5 Connector Junction Board Assembly and FPC Board Assembly Removal............. 3-36
3.2.6.6 PG Sensor and PG Motor Removal ........................................................................ 3-37
3.2.6.7 Plunger and Paper Bail Assembly Removal............................................................ 3-38
3.2.6.8 Upper Paper Guide and Top PE Sensor Removal .................................................. 3-40
3.2.6.9 Tension Roller Shaft Removal................................................................................. 3-41
3.2.6.10 Platen Removal ..................................................................................................... 3-43
3.2.6.11 Paper Jam Sensor Removal.................................................................................. 3-44
3.2.6.12 Pull Tractor Sensor Removal................................................................................. 3-45
3.2.6.13 Paper Width (PW) Sensor Removal ..................................................................... 3-46
3.2.6.14 PG Home Sensor Removal.................................................................................... 3-47
3.2.6.15 PF Motor Removal ................................................................................................. 3-49
3.2.6.16 Left Side Frame Gear Removal ............................................................................ 3-50
3.2.6.17 Front Tractor Assembly Removal ........................................................................... 3-51
3.2.6.18 Rear Tractor Assembly Removal .......................................................................... 3-52
3.2.6.19 CR Motor Fan Removal.......................................................................................... 3-53
3.2.6.20 CR Motor Removal................................................................................................. 3-54
3.2.6.21 CR (Carriage Encoder) Sensor Removal.............................................................. 3-55
3.2.6.22 Carriage Mechanism Disassembly........................................................................ 3-56
3.2.6.23 Paper Support Assembly Removal ........................................................................ 3-59
3.2.6.24 PF Drive Roller Removal ....................................................................................... 3-60