All black in
printing area?
Is charge
voltage supplied
from HVPS?
Is the
Hsync signal received
in LSU?
Charge part's contact
is bad -> Repair or
replace the drum 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
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