Scanner - Xerox WorkCentre Pro 412 Service Manual

Maintenance & Troubleshooting

7-3 Scanner

7-3-1 Copy
PROBLEM
White copy
Black copy
Defective image quality
7-12
ITEMS TO BE CHECKED.
• Check the scan-cover is not open.
• Check shading profile.
• Check white/black reference volt-
age in Main PBA.
• Check the CCD lamp is on when
scanning.
• Check for CCD problem in Main
PBA.
• Check shading profile.
• Check the CCD problem in Main
PBA.
• Check shading profile.
• Check the gap between original
and scanner glass.
• Check printing quality.
3/03
HOW TO SOLVE
• Ambient light can cause image
problems
• Remake shading profile in the Tech
mode.
• Replace Main PBA if it is defective.
- U16-97 = 3.3V - U16-98 = 3.3V
- U16-99 = 1.5V
• If the CCD is defective, replace it.
- CN3-19 is 5.8V when white original
copying for R, B and 3.5V for G.
• Check the CCD harness contacts.
• Remake shading profile in the Tech
mode.
• If the CCD is defective, install a
new ELEC/MECH-SCANNER MOD-
ULE, PL 2-2-21.
- Cn3-19 is 7.3V when idle for R, B,
and 5V for G.
• Remake shading profile in the Tech
mode.
• A gap greater than 0.5mm can
cause a blurred image.
• See "Print" troubleshooting.
WorkCentre Pro 412, FaxCentre F12 &
WorkCentre M15/M15i