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4-2-2 All Black
All black in
printing area?
YES
Is transfer
voltage supplied
from HVPS?
YES
Is the
Hsync/ signal received
in LSU?
YES
Transfer part's contact
is bad. -> Repair or
replace toner cartridge.
Samsung Electronics
Does the
NO
video data line to LSU
transit to High/ Low when
printing?
Replace LSU.
NO
NO
NO
YES
Repair or replace HVPS.
Replace LSU.
Troubleshooting
Check the path among video
controller, engine board,
HVPS, LSU for the shortage
or open. -> Repair or replace
the boards.
4-3
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