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Alignment and Troubleshooting
4-71
4.2.7 Copy Problems
1) Black Copy
Description : Black page is printed out when copy.
1. Check the Scan-Cover open.
Room light can pass through a
thin original.
Remake shading profile in the
tech mode.
2. Check shading profile.
3. Check white/black reference
voltage in Main PBA.
Replace U60 if it is defective.
. U60-154 = 0.5V
. U60-155 = 3.3V