Dell 2355 Mono Laser, Service Manual

Page: 79 / 181

Alignment and Troubleshooting
4-39
Service Manual
4.2.3 Solution
4.3.2.1 Scanner
4.3.2.1(a)COPY
PROBLEM ITEMS TO BE CHECKED HOW TO SOLVE
White copy • Check the Scan-Cover open. • Room light can transit a thin original.
• Check shading profile. • Execute the shading test in the diagnostic
mode.
Black copy • Check the CCD problem in Main
PBA.
• Check the CCD harness contact.
• Check shading profile. • Execute the shading test in the diagnostic
mode.
Defective image
quality
• Check shading profile.
• Check the gap between original and
scanner.
• Execute the shading test in the diagnostic
mode.
• The gap above 0.5mm can cause a blurred
image.
• Check printing quality. • See “Print” troubleshooting.
Abnormal noise • Check the Scanner Motor and any
mechanical disturbance.
• Check the right position of the Scanner Motor,
and check the any mechanical disturbance in
the CCD carriaging part.
• Check the Motor Driver in Driver
PBA.
• If any driver is defective, replace it.