Lexmark X502n Service Manual - Page 63

Laser unit assembly service check, HVPS connection service check, and HVPS BCN1. Is cable okay? Also

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7100-XXX Laser unit assembly service check Step 1 Questions / actions Check LCN connection on laser assembly LDU board. Is connector properly connected? Yes Go to step 2. 2 Check LCN connection on engine controller Go to step 3. board. Is cable properly connected? 3 Check cable that connects engine controller Replace laser unit board LCN and LDU LCN connectors for assembly. "Upper right continuity and shorted pins. Is cable okay? rear cover removal" on page 4-17. Go to step 4. 4 Does error clear? Problem solved. HVPS connection service check 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. Step 1 2 Questions / actions Yes No Turn printer off, and remove engine controller board shield. See "Engine 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? Turn printer off, and remove items to expose HVPS. See "High voltage power supply (HVPS) removal" on page 4-39 for steps. 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. 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. 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. Diagnostic information 2-25

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Diagnostic information
2-25
7100-XXX
Laser unit assembly service check
HVPS connection 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.
“Upper right
rear cover removal” on
page 4-17
. 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 4-34
.
Step
Questions / actions
Yes
No
1
Turn printer off, and remove engine
controller board shield. See
“Engine
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?
Go to step 2.
Properly connect cable.
Retest printer. If error
clears, problem solved,
otherwise go to step 2.
2
Turn printer off, and remove items to expose
HVPS. See
“High voltage power supply
(HVPS) removal” on page 4-39
for steps.
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.
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
.
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
.