Perfection 4870 Photo
Revision A
OPERATING PRINCIPLES
Engine Operation Outline
21
2.1.1.2 TPU Carriage Unit outline
The TPU Carriage Unit consists of TPU Inverter Board, Lamps (light source), SUB_C
Board, and SUB_D Board.
Figure 2-3. TPU Carriage Unit Configuration
TPU Inverter Board
24VDC and converts DC to AC to generate
the voltage for driving the Lamps (white cool cathode
fluorescent lamps).
Lamps
White cool cathode fluorescent lamps are used as a
light source. When the amount of light is not stable, the
Panel LED is flashes and enter the standby mode until
it becomes stable.
SUB_C Board/
Each board has LEDs to generate an infrared light.
SUB_D Board
TPU Inverter Board
LEDs
Front
Rear
SUB_D Board
SUB_C Board
Lamps
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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