Troubleshooting - Samsung SCX-1000I Service Manual

4. Troubleshooting

4-1 SCANNER
4-1-1 COPY
PROBLEM PROBLEM
White copy
Black copy
Defective image
quality
Abnormal noise
Samsung Electronics
ITEMS TO BE CHECKED ITEMS TO BE CHECKED
• Check the scan-cover open.
• Check shading profile.
• Check white/black reference voltage in
Main PBA.
• Check the CIS problem in Main PBA.
• Check turning the CIS LED on when
operating.
• Check shading profile.
• Check white/black reference voltage in
Main PBA.
• Check the CIS problem in Main PBA.
• Check shading profile.
• Check the gap between original and
scanner glass.
• Check printing quality.
• Check the scanner glass and any
mechanical disturbance.
• Check the motor driver in Driver PBA.
HOW TO SOLVE HOW TO SOLVE
• Room light can transit a thin original.
• Remake shading profile in the tech mode.
• Replace U2 or U12 if it is defective.
- U2-1 or U12-78 = 3.2V
- U2-7 or U12-79 = 1.9V
• If the CIS is defective, replace it.
- CN6-1 is 3.2V when white original copying.
- Cn6-1 is 1.4V when idle.
• Check the CIS harness contact.
• Remake shading profile in the tech mode.
• Replace U2 or U12 if it is defective.
- U2-1 or U12-78 = 3.2V
- U2-7 or U12-79 = 1.9V
• If the CIS is defective, replace it.
- CN6-1 is 3.2V when white original copying.
- CN6-1 is 1.4V when idle.
• Remake shading profile in the tech mode.
• The gap above 0.5mm can cause a blurred
image.
• See "Print" troubleshooting.
• Check the right position of the scanner glass,
and check the any mechanical disturbance in the
CIS carriaging part.
• If any driver is defective, replace it.
- U9-1, 19 or U10-1, 19 = 0V to 30V swing signal
when operating.
4-1