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All Black
All black in
printing area?
YES
Is transfer
voltage supplied
from Engine B'd?
YES
Is the
Hsync/ signal received
in LSU?
YES
Transfer part's contact
is bad -> Repair or
replace toner cartridge
Samsung Electronics
NO
video data line to LSU
transit to High/Low when
Replace LSU
NO
NO
Does the
NO
printing?
YES
Repair or replace Engine B'd
Replace LSU
Maintenance & Troubleshooting
Check the path among video
controller, engine board,
LSU for the shortage or open
-> Repair or replace the boards
4-11
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