Perfection 4870 Photo
Revision A
OPERATING PRINCIPLES
Power Supply Circuit
26
2.3 Power Supply Circuit
This Power Supply Circuit Board generates DC power necessary to drive the Control
Board and Scanner Engine.
indicates the Power Supply Circuit Boards on a
destination basis.
The output of the Power Supply Circuit Board is provided by closing/opening the No. 4
pin of the CN102 Connector. When the pin is open, the output voltages indicated in
become active. The output voltages have their respective overcurrent
protection and overvoltage protection circuit functions.
NOTE 1:
If any of the outputs shuts down, all the other outputs also shut down.
2:
The input OFF time necessary for recovery is 5 minutes (maximum).
Table 2-1. Destination-based Power Supply Circuit Boards
Specifications
Unit Part No.
Fuse Rating
100-120VAC region
2027705
2.5 A/125 VAC
220-240VAC region
2027704
T2.5AH/250 VAC
Table 2-2. Power Supply Circuit Board Outputs and Protective Functions
Output
Voltage
Output
Current
Overcurrent Protection
(Protective circuit
operation current value)
Overvoltage Protection
(Protective circuit
operation voltage value)
5 VDC
1.2 A
Voltage droop with
current decrease.
Automatic recovery.
(1A or less)
Shutdown. Switch
power off, then on again
to recover. (5.5 to
7.5VDC)
12 VDC
0.2 A
Depending on the
drooping characteristic of
the regulator. Automatic
recovery. (0.5A or less)
Shutdown. Switch
power off, then on again
to recover. (14 to
17VDC)
24 VDC
0.7 A
Shutdown. Switch power
off, then on again to
recover.
Shutdown. Switch
power off, then on again
to recover. (28 to
33VDC)
Summary of Contents for Perfection 4870 Photo
Page 1: ...EPSON Perfection4870Photo Color Image Scanner Service Manual SESC03 008 ...
Page 5: ...Revision Status Revision Date of Issue Description A December 10 2003 First release ...
Page 8: ...C H A P T E R 1 PRODUCTDESCRIPTION ...
Page 19: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Page 29: ...C H A P T E R 3 TROUBLESHOOTING ...
Page 37: ...C H A P T E R 4 DISASSEMBLY ASSEMBLY ...
Page 63: ...C H A P T E R 5 ADJUSTMENT ...
Page 65: ...C H A P T E R 6 MAINTENANCE ...
Page 68: ...C H A P T E R 7 APPENDIX ...
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