Laser Unit Assembly Service Check; Hvps Connection Service Check - Lexmark X500n Service Manual

Laser unit assembly service check

Step
1 Check LCN connection on laser assembly
LDU board. Is connector properly
connected?
2 Check LCN connection on engine controller
board. Is cable properly connected?
3 Check cable that connects engine controller
board LCN and LDU LCN connectors for
continuity and shorted pins. Is cable okay?
4 Does error clear?

HVPS connection service check

Step
1 Turn printer off, and remove engine
controller board shield. See
controller board removal" on page 4-34
for steps to remove shield. Is cable properly
connected to BCN1 on the HVPS and the
engine controller board HVCN connector?
2 Turn printer off, and remove items to expose
HVPS. See
(HVPS) removal" on page 4-39
Check for continuity and pin shorts of cable
that connects engine controller board HVCN
and HVPS BCN1. Is cable okay? Also
ensure that there is no damage to the
connectors on both boards.
Questions / actions
Questions / actions
"Engine
"High voltage power supply
for steps.
Yes
Go to step 2.
Go to step 3.
Replace laser unit
assembly. "Upper right
rear cover removal" on
page 4-17. Go to step 4.
Problem solved.
Yes
Go to step 2.
Replace HVPS. See "High
voltage power supply
(HVPS) removal" on
page 4-39. Retest printer. If
error clears, problem
solved, otherwise turn
printer off and replace
engine controller board.
See "Engine controller
board removal" on
page 4-34.
7100-XXX
No
Properly connect LCN
cable. If error clears,
problem solved, otherwise
go to step 2.
Properly connect LCN
cable. If error clears,
problem solved, otherwise
go to step 3.
Replace cable. Go to step
4.
Replace engine controller
board. See "Engine
controller board removal"
on page 4-34.
No
Properly connect cable.
Retest printer. If error
clears, problem solved,
otherwise go to step 2.
Replace cable. Retest
printer. If error clears,
problem solved, otherwise
turn printer off and replace
engine controller board.
See "Engine controller
board removal" on
page 4-34.
2-25
Diagnostic information