Dell 2355DN Service Manual - Page 84

All Black, Replace LSU - drum

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Alignment and Troubleshooting All Black Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer All black in NO printing area? YES Does the video data line to LSU NO transit to High/Low when printing? YES Check the path among video controller, engine board, HVPS, LSU for the shortage or open -> Repair or replace the boards Replace LSU Is charge voltage supplied NO from HVPS? YES Repair or replace HVPS Is the NO Hsync signal received in LSU? YES Charge part's contact is bad -> Repair or replace the drum cartridge Replace LSU 4-44 Service Manual

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Alignment and Troubleshooting
4-44
Service Manual
All Black
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