Samsung ML-5200A, Service Manual

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