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4. Troubleshooting
4-1 Abnormal Image Printing and Defective Roller
If abnormal image prints periodically, check the parts shown below.
No
Roller
1
OPC Drum
2
Charge Roller
3
Supply Roller
4
Develop Roller
5
Transfer Roller
6
Heat Roller
7
Pressure Roller
4-2 Print Quality
4-2-1 No Image
No image?
YES
Self test
pattern prints?
YES
Check connection to
computer or replace
controller.
Samsung Electronics
Abnormal image period
94.3mm
37.7mm
40.0mm
46.1mm
47.1mm
56.1mm
56.2mm
NO
Self testing
NO
is possible via
Take out the cartridge
and prepare the tester
for electronic connection.
Is the OPC
terminal of machine
well-connected
to Frame?
Does the
video data line to
LSU transit to High/Low
when printing?
The mirror in LSU might be misplaced so the light
path to the OPC deviates ->Repair or replace LSU
or remove any defective matters in the machine.
Black side contamination/transfer fault
NO
DCU?
YES
NO
YES
NO
YES
Kind of abnormal image
White spot
Black spot
Horizontal density band
Horizontal density band
Black spot and fuser ghost
Black side contamination
A on
next page
Re-test after replacing the
conector or controller board.
Repair or replace the GND
terminal.
Check the path between
video controller, engine board
and HVPS. Repair or replace
the defective component
or board.
4-1
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