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Maintenance & Troubleshooting
All Black
All black in
printing area?
YES
Is transfer
voltage supplied
(-1.55 KV)?
YES
Is the
Hsync/ signal received
in LSU?
YES
Transfer part's contact
is bad -> Repair or
replace toner cartridge
5-10
Does the
NO
video data line to LSU
transit to High/Low when
printing?
Replace LSU
NO
Repair or replace HVPS
NO
Replace LSU
NO
YES
Check the path among video
controller, engine board,
HVPS, LSU for the shortage
or open -> Repair or replace
the boards
Samsung Electronics
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