Troubleshooting
4-16
Samsung Electronics
All black in
printing area?
Is transfer
voltage supplied
(-1.55 KV)?
Is the
Hsync/ signal received
in LSU?
Transfer part’s contact
is bad -> Repair or
replace toner cartridge
Does the
video data line to LSU
transit to High/Low when
printing?
Replace LSU
Check the path among video
controller, engine board,
HVPS, LSU for the shortage
or open -> Repair or replace
the boards
Repair or replace HVPS
Replace LSU
NO
NO
NO
NO
YES
YES
YES
YES
All Black