Samsung CLP-680 Series Service Manual page 115

5) Blank Page
• Description : Blank page is printed.
Cause and Check Point
Bad contacts from OPC drum and/or toner cartridge to
ground.
Not working the LSU.
Not working the developing bias voltage on HVPS.
6) Uneven Density
• Description : Print Density is uneven between left and right.
Cause and Check Point
The life of the Toner Cartridge has expired.
The pressure force in the left and right springs of the ITB
unit is not even.
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4. Alignment and Troubleshooting
Solution
Check the terminal of Ground-OPC.
Check the connector of LSU.
Replace the HVPS.
Solution
Replace the toner cartridge.
Replace the ITB Unit
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