Table Of Contents - Epson Perfection 4870 Photo Service Manual

Perfection 4870 Photo
Chapter 1 PRODUCT DESCRIPTION
1.1 Features.................................................................................................................. 9
1.2 Basic specification............................................................................................... 10
1.3 Interface Specifications ....................................................................................... 13
1.3.1 IEEE1394.................................................................................................... 13
1.3.2 USB............................................................................................................. 13
1.4 Exterior Specifications ........................................................................................ 14
1.4.1 Explanation of switches.............................................................................. 14
1.4.2 Explanation of indications .......................................................................... 14
1.4.3 Outside Drawing ......................................................................................... 15
1.5 Control Codes...................................................................................................... 16
1.6 Error-time Processing.......................................................................................... 17
1.7 Scanning Range ................................................................................................... 18
1.7.1 Reflective document ................................................................................... 18
1.7.2 Transparent document ................................................................................ 18
Chapter 2 OPERATING PRINCIPLES
2.1 Engine Operation Outline.................................................................................... 20
2.1.1 Outline ........................................................................................................ 20
2.1.1.1 Carriage Unit outline ........................................................................... 20
2.1.1.2 TPU Carriage Unit outline .................................................................. 21
2.1.2 Moving Mechanism operation .................................................................... 22
2.1.2.1 Carriage Moving Mechanism operation.............................................. 22
2.1.2.2 TPU Carriage Moving Mechanism operation ..................................... 23
2.2 Digital Ice function operation.............................................................................. 24
2.2.1 Print-Ice function ........................................................................................ 24
2.2.2 Film-Ice function ........................................................................................ 24
2.3 Power Supply Circuit .......................................................................................... 26
2.4 Control Circuit..................................................................................................... 27
2.4.1 Power Supply Circuit operation outline ..................................................... 27
2.4.2 Image processing operation ........................................................................ 28
Contents
Chapter 3 TROUBLESHOOTING
3.1 Overview ............................................................................................................. 30
3.1.1 Self-diagnostic Function............................................................................. 30
3.2 Troubleshooting................................................................................................... 31
Chapter 4 DISASSEMBLY/ASSEMBLY
4.1 Overview ............................................................................................................. 38
4.1.1 Precautions.................................................................................................. 38
4.1.2 Recommended Tools .................................................................................. 38
4.1.3 The List of Recommended Screws............................................................. 39
4.2 Disassembly Procedure ....................................................................................... 40
4.2.1 Removal of Document Cover ..................................................................... 41
4.2.2 Removal of Upper Housing........................................................................ 42
4.2.3 Removal of Panel Board............................................................................. 43
4.2.4 Removal of Main Board ............................................................................. 44
4.2.5 Removal of Carriage Unit........................................................................... 46
4.2.6 Removal of CR Motor Unit ........................................................................ 48
4.2.7 Removal of Driven Pulley .......................................................................... 49
4.2.8 Removal of SUB_A Board ......................................................................... 50
4.2.9 Removal of Power Supply Board ............................................................... 51
4.2.10 Removal of Power Supply Cable Unit ..................................................... 52
4.2.11 Removal of TPU Lower Housing............................................................. 53
4.2.12 Removal of TPU Inverter Board .............................................................. 54
4.2.13 Removal of TPU Carriage Unit ................................................................ 56
4.2.14 Removal of TPU Main Board................................................................... 57
4.2.15 Removal of Hinges ................................................................................... 58
4.2.16 Removal of SUB_B Board ....................................................................... 59
4.2.17 Removal of TPU CR Motor Unit/
TPU CR Motor Belt................................................................................... 59
4.2.18 Removal of TPU CR Timing Belt/
TPU Driven Pulley Unit ............................................................................ 61
4.2.19 Removal of TPU Unit Cable .................................................................... 62
Revision A
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