Dell 2355DN Service Manual - Page 79

Solution, 3.2.1 Scanner

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Alignment and Troubleshooting 4.2.3 Solution 4.3.2.1 Scanner 4.3.2.1(a)COPY PROBLEM White copy Black copy Defective image quality Abnormal noise ITEMS TO BE CHECKED HOW TO SOLVE • Check the Scan-Cover open. • Room light can transit a thin original. • Check shading profile. • Execute the shading test in the diagnostic mode. • Check the CCD problem in Main PBA. • Check the CCD harness contact. • Check shading profile. • Execute the shading test in the diagnostic mode. • Check shading profile. • Execute the shading test in the diagnostic • Check the gap between original and mode. scanner. • The gap above 0.5mm can cause a blurred image. • Check printing quality. • See "Print" troubleshooting. • 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. 4-39 Service Manual

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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.