Epson Stylus COLOR 670 Service Manual page 8

EPSON Stylus COLOR 670
Operating Principles
Overview ..................................................................................................... 31
Printer Mechanism ................................................................................. 31
Printhead ................................................................................................ 33
Printing Process ................................................................................. 34
Printing Method .................................................................................. 35
Carriage Mechanism .............................................................................. 36
Platen Gap (PG) Adjustment Mechanism ........................................... 36
Paper Feeding Mechanism .................................................................... 37
Paper Loading Mechanism (ASF Unit) ................................................... 38
Ink System Mechanism .......................................................................... 40
Pump Unit and CR Lock Mechanism .................................................. 40
Capping Mechanism ............................................................................... 41
Ink Sequence ......................................................................................... 42
Electrical Circuit Operating Principles .................................................... 43
C301PSB/PSE Board ............................................................................. 43
C301MAIN Board ................................................................................... 45
Main elements .................................................................................... 46
Printhead Driver Circuit ...................................................................... 47
PF Motor (PF/ PUMP/ ASF Motor) Driver Circuit ............................... 48
CR Motor Driver Circuit ...................................................................... 49
Reset Circuit ....................................................................................... 49
EEPROM Control Circuit .................................................................... 50
Sensor Circuit ..................................................................................... 51
Troubleshooting
Overview ..................................................................................................... 53
Unit Level Troubleshooting ...................................................................... 54
Printer does not operate at power on ..................................................... 55
Error is detected ..................................................................................... 55
Failure occurs during printing ................................................................. 56
Printer does not feed paper correctly ..................................................... 56
Control panel operation is abnormal ...................................................... 57
Unit Repair (Power Supply Board) ........................................................... 57
Unit Repair (Control Board) ...................................................................... 58
Unit Repair (Printer Mechanism) .............................................................. 61
Disassembly and Assembly
Overview .................................................................................................... 67
Precautions ............................................................................................ 68
Tools ...................................................................................................... 69
Work Completion Check ........................................................................ 70
Disassembly .............................................................................................. 71
Housing Removal ................................................................................... 72
Circuit Board Assembly Removal ........................................................... 73
Control Panel Removal .......................................................................... 75
Ink Absorber Tray Assembly (Waste Ink Pad) Removal ........................ 76
Printer Mechanism Disassembly ............................................................ 77
Printhead Removal ............................................................................. 77
Pump Assembly / Cap Assembly Removal ........................................ 80
CR Motor Assembly Removal ............................................................ 82
PF Motor Assembly Removal ............................................................. 83
ASF Assembly Removal ..................................................................... 85
ASF LD Roller Assembly Removal ..................................................... 87
LD Roller Assembly Disassembly ...................................................... 92
CR Assembly Removal ...................................................................... 93
PE Sensor Assembly Removal .......................................................... 95
PF Roller Assembly Removal ............................................................. 96
CR HP Sensor Removal ..................................................................... 98
Revision A
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