Samsung SCX-4521F Series - Copy Problems; White Copy; Black Copy

Troubleshooting
Samsung Electronics
Service Manual
6-27
6.7.1 White Copy
• Description Blank page is printed out when copying.
6.7 Copy Problems
6.7.2 Black Copy
• Description Black page is printed out when Copying.
Check and Cause Solution
1. Check for CIS problem on the Main PBA.
2. Check shading profile.
1. Check the CIS FFC Cable is properly connected.
2. Redo shading profile in the tech mode.
Check and Cause Solution
1. Check the Scanner Cover is properly closed.
2. Check shading profile.
3. Check white/black reference voltage on Main PBA.
1. Room light can pass through a thin original.
2. Redo shading profile in the tech mode.
3. Replace the Main PBA.