Samsung CLP-670N Service Manual page 119

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Description
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
Uneven Density
Description Print Density is uneven between left and right.
Cause and Check Point
The pressure force in the left and right springs of the
transfer roller is not even, the springs are damaged,
the transfer roller is improperly installed
The toner layer is not even in the developing roller due
to the damaged blade or low toner level.
Poor the pressure spring force of the toner cartridge.
The life of the Toner Cartridge has expired.
Service Manual
Alignment & Troubleshooting
Check the terminal of Ground-OPC.
Check the connecter of LSU
Check the HVPS B'd and replace it.
Poor fusing
Poor fusing
Dark image or Black
Dark image or Black
Replace the PTB Unit
Replace the toner cartridge
Horizontal Bands
Replace the toner cartridge
Replace the toner cartridge
Horizontal Bands
4-60
Solution
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Vertical Black Line and Band
Vertical Black Line and Band
Solution
Uneven Density
Uneven Density
Samsung Electronics
Conta
Cont