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Adjustment and Troubleshooting
Service Manual
4-51
4.2.3 Copy Problems
1) White Copy
Description: Blank page is printed out when copying.
1. Check the Scanner Cover
is properly closed.
2. Check shading profile.
3. Check white/black
reference voltage on Main PBA. e.q
• CIS_SI, CIS_CLK at Chip(U28)
Room light can pass through a
thin original.
Redo shading profile in the
tech mode.
Replace CN8 if it is defective.
• U28-Pin6 (CIS_SI)
• U28-Pin8 (CIS_CLK)