Service manual

Troubleshooting
Samsung Electronics 4-23
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 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
All Black
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer