Epson Stylus Color 660 Service Manual Page 44
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EPSON Stylus COLOR 670 Revision A
Operating Principles Electrical Circuit Operating Principles 44
Figure 2-12. C301PSB/PSE Board Block Diagram
The C301PSB/PSE board has the various control circuits to stop voltage
output if a malfunction occurs on the power supply board or the main board
while the printer mechanism is on duty. Following explains each control and
protection circuit.
o +42V line constant voltage control circuit:
The output level of +42V line is monitored by a detection circuit
composed of the seven Zener diodes. When the output voltage
becomes less than 35V, this circuit prevents the voltage from
dropping by driving the primary circuit switching FET.
o +5V line constant voltage control circuit:
The output level of the +5VDC line voltage is monitored by the
regulator IC51. If abnormal voltage is detected, the information is fed
back to the internal comparator.
o +42VDC line over voltage protection circuit:
The output voltage line is monitored by two Zener diodes. If the
output level of the voltage level of +42VDC line exceeds +48V, this
circuit halts the operation of the switching FET and prevents high
voltage from applied to the secondary side.
o +5V line over voltage/ line over current protection circuit:
This protection circuit is in the same line as the +42V over voltage
protection circuit is located. The output voltage level of the +5V line is
monitored by a Zener diode. This circuit shuts down the +5V line
forcefully when the voltage level exceeds +9V.
o +42VDC line over current protection circuit:
The output voltage is monitored by two transistors. When the output
voltage is dropped abnormally, this circuit regards this as short circuit
and halts the operation of the primary switching FET via photocoupler
to prevent over current from flowing.
F1
C11
L1
DB1
TRANS(T1)
O ver C urrent
Protection
F ilte r C ir c iu t
Full W ave
R ectifier circuit
Sm oothing
Circuit
M a in S w itc h in g
Circuit
Q1
Abnorm al
Feed back circuit
Q2,Q3,Q31
Photo
C oupler
PC1
D51
AC Input
Sm oothing
Circuit
C51
+42V D C Line
C onstant C ontrol
ZD 81-86,ZD 51
Power Drop
Delay Circuit
C 84,Q 84
+42V D C Line
O ver V oltage
Lim itation
ZD52,86
+5V R egulator
IC 5 1
+42 VD C
+5 VD C
+5V D C Line
O ver V oltage
Lim itation
PSC S ignal
from M ain board
ZD53
+42V D C Lin D rop
Lim itation C ircuit
ZD90
- SERVICE MANUAL 1
- PRECAUTIONS 3
- About This Manual 4
- Contents 4
- Symbols Used in This Manual 5
- Revision Status 6
- Operating Principles 8
- Troubleshooting 8
- Disassembly and Assembly 8
- Adjustment 9
- Maintenance 9
- Appendix 9
- PRODUCT DESCRIPTION 10
- 1.1 Overview 11
- 1.2 Basic Specifications 12
- 1.2.4 Electric Specification 13
- 1.2.6 Reliability 14
- 1.2.7 Safety Approvals 14
- 1.2.8 Acoustic noise 14
- 1.3 Interface 15
- Pin #1Pin #2 19
- Pin #3 Pin #4 19
- 1.3.4.2 Interface Selection 20
- 1.3.4.3 IEEE 1284.4 protocol 20
- 1.3.5.1 Control codes 21
- 1.4.2.1 Switches 22
- 1.4.6 Printer Initialization 23
- 1.4.7 Errors 24
- 1.4.8 Paper Handling 24
- 1.4.9 Paper Specification 24
- 1.4.10.1 Cut Sheet 26
- 1.4.10.2 Envelope 27
- 1.4.11 Ink Cartridge 28
- 1.5 Physical Specification 29
- 1.6 Accessories 29
- OPERATING PRINCIPLES 30
- 2.1 Overview 31
- 2.1.2 Printhead 33
- 2.1.2.1 Printing Process 34
- 2.1.2.2 Printing Method 35
- 2.1.3 Carriage Mechanism 36
- PF Roller 37
- Hopper Spring 39
- Pad Spring 39
- Tube squeezed 40
- Tube released 40
- 2.1.7 Capping Mechanism 41
- 2.1.8 Ink Sequence 42
- 2.2.1 C301PSB/PSE Board 43
- TRANS(T1) 44
- 2.2.2 C301MAIN Board 45
- 2.2.2.1 Main elements 46
- E05B 70**(IC 2) 47
- 2.2.2.5 Reset Circuit 49
- 2.2.2.7 Sensor Circuit 51
- TROUBLESHOOTING 52
- 3.1 Overview 53
- Table 3-3. LED Indicators 54
- 3.2.2 Error is detected 55
- Flowchart 3-3 56
- Flowchart 3-4 56
- Flowchart 3-5 57
- DISASSEMBLY AND ASSEMBLY 66
- 4.1 Overview 67
- W ARNING 68
- 4.1.2 Tools 69
- 4.1.3 Work Completion Check 70
- 4.2 Disassembly 71
- 4.2.1 Housing Removal 72
- Cable Holders 73
- ADJUSTMENT 74
- REQUIRED 74
- 4.2.3 Control Panel Removal 75
- Waste Ink Pad Assembly 76
- Securing Screw 76
- 4.2.5.1 Printhead Removal 77
- Head Fastener 77
- Printhead 77
- Torsion Spring 49 77
- Viewed from front 78
- Viewed from back 78
- Pump Assembly 80
- Combination Gear 6, 34.4 83
- C Ring 6.1 x 0.5 x 9.0 83
- Cable Direction 84
- 4.2.5.5 ASF Assembly Removal 85
- ASF Left Protrusion 86
- Installation Point 86
- Head FFC 86
- ASF Assembly 86
- Right Hopper Release Lever 87
- ASF HP Detection Wheel 87
- Left ASF LD Roller 87
- Fixing Bushing 87
- Right LD Roller 89
- Compression Spring 1.961 91
- Screw Fixing Hooks 91
- 4.2.5.8 CR Assembly Removal 93
- PE Sensor Lever Head 95
- Left Bushing 12 97
- Shift this toward the left 97
- Front Side of the Printer 97
- Right Upper Paper Guide 97
- Sensor Securing Hook 98
- CR HP Sensor 98
- 5.1 Overview 100
- Put the gauge on a flat 101
- Adjustment Adjustment 102 102
- 5.3.2 Adjustment Program 103
- 5.3.4 Check This Model Name 106
- 5.3.5 Head ID Input 107
- 5.3.7 Bi-D Adjustment 112
- 5.3.8 USB ID Input 115
- TO ONLY CHECK THE USB ID 116
- 5.3.9 Head Cleaning 117
- 5.3.10 Initial Ink Charge 118
- MAINTENANCE 122
- 6.1 Overview 123
- 6.1.2 Service Maintenance 124
- 6.1.3 Lubrication 125
- Maintenance Overview 126 126
- Maintenance Overview 127 127
- Maintenance Overview 128 128
- APPENDIX 129
- 7.1 Connector Summary 130
- Table 7-8. Connector CN10 132
- Table 7-9. Connector CN11 132
- Table 7-10. Connector CN12 132
- 7.1.2 EEPROM Address Map 133
- 7.2 Component Layout 137
- Appendix Component Layout 138 138
- 7.3 Exploded Diagram 139
- REV.01 10189 140
- REV.01 10189 141
- 7.4 Parts List 143
- Appendix Parts List 144 144
- Appendix Parts List 145 145
- Appendix Parts List 146 146
- Appendix Parts List 147 147
- C301 MAIN Control Circuit 148
- C301 PSB Power Supplu Circuit 148
- C301 PSE Power Supply Circuit 148
- C209PNL Circuit 148
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