Lexmark 5021-0XX - Manual (Page 140)

2-62 Service Manual
5021-0XX
930,931,932—Laser unit assembly service check
Step Questions / actions Yes No
1 Check LCN connection on
laser assembly LDU board.
Is connector properly
connected? Go to step 2. Properly connect
LCN cable. If
error clears,
problem solved,
otherwise go to
step 2.
2 Check LCN connection on
engine controller board. Is
cable properly connected? Go to step 3. Properly connect
LCN cable. If
error clears,
problem solved,
otherwise go to
step 3.
3 Check cable that connects
engine controller board
LCN and LDU LCN
connectors for continuity
and shorted pins. Is cable
okay? Replace laser
unit assembly.
“Laser unit
assembly
(printhead)
removal” on
page 4-24
. Go
to step 4.
Replace cable.
Go to step 4.
4 Does error clear? Problem solved. Replace engine
controller board.
See
“Engine
controller
board removal”
on page 4-55
.