Samsung SF-76x series Service Manual page 90

4. Alignment and Troubleshooting
Check and cause
Transfer roller is contaminated.
11) Blank page
Description : The back of the page is stained.
Check and cause
The ground contact of the toner cartridge is bad.
LSU is defective.
The connection between the main board and SMPS/HVPS
board is bad.
12) Partial image void
Description : The partial void occurs in the printed page.
Check and cause
The printer is not installed on flat ground.
The developer circulation in the toner cartridge is bad.
The contact between toner cartridge and transfer roller is
bad.
4-31
Solution
Replace the transfer roller.
Solution
Clean the ground terminal of the toner cartridge. If the
problem persists, replace the toner cartridge.
Replace the LSU.
Reconnect the harness. If the main board or SMPS/HVPS
board is defective, replace it.
Solution
Install the printer on flat ground. Print 10 sample pages for
test.
1) Shake the toner cartridge 2~3 times from right to left.
Reinstall the toner cartridge. Print 10 sample pages
for test.
2) If the problem persists, replace the toner cartridge.
Check if the toner cartridge and transfer roller are installed
properly.
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