Perfection 4870 Photo
Revision A
OPERATING PRINCIPLES
Digital Ice function operation
25
Film-Ice function sequence
1. Read the visible light position (To recognize the home position of image scanning, it
reads two holes of the Upper Housing Scale section).
2. Scan a visible-light image.
3. Scan an infrared-light image.
4. Superimposes the images obtained from each light and detects the flaws and/or the
foreign matter.
5. Erases the flaws and/or the foreign matter on the hardware, which have been detected
in the step 4 and obtains the image without any flaw and/or foreign matter.
Figure 2-8. Extraction/Correction of Dust by Film-Ice Function
Dirt extraction
After correction
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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