Samsung ProXpress M337x Service Manual page 158

4. Alignment and Troubleshooting
11) Blank page
Description : The back of the page is stained.
Check and cause
The ground contact of laser toner cartridge or imaging unit
is bad.
LSU is defective.
The connection between the main board and 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 laser toner cartridge or
imaging unit is bad.
The contact between imaging unit and transfer roller is bad.
4-75
Solution
Clean the ground terminal of laser toner cartridge or imaging
unit. If the problem persists, replace it.
Replace the LSU.
Reconnect the harness. If the main board or HVPS board
is defective, replace it.
Solution
Install the printer on flat ground. Print 10 sample pages for
test.
1) Shake the laser toner cartridge or imaging unit 2~3
times from right to left. Reinstall it. Print 10 sample
pages for test.
2) If the problem persists, replace the laser toner
cartridge or imaging unit.
Check if the imaging unit and transfer roller are installed
properly.
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