Transfer Belt Unit Service Check - Lexmark X500n Service Manual

Step Questions / actions
7 Disconnect cable from engine controller
board POCN. Check the following on
disconnected cable connector:
Pin 21 to pin 22—24VDC
Pin 13 to pin 14—5VDC
Are voltages present?
8 Reassemble and retest printer. Does error
clear?

Transfer belt unit service check

Step
1 Open rear cover assembly, and check
transfer belt unit markers for stains. Are
markers stained?
2 Remove transfer belt unit, and observe
markers on side. Are belt markers deformed
or does transfer belt seem hard to rotate?
3 Turn printer off, and remove engine
controller board shield. See
controller board removal" on page 4-34
for steps to remove engine controller board
shield. Are cables properly connected to
engine controller board connectors MCN9
and POCN?
4 Ensure rear cover assembly and front cover
assembly are closed. Override top interlock
switch, and turn printer on. Wait until printer
displays error, and remove MCN9 from
engine controller board. Check for 5 VDC
between MCN9 pin 1 (on engine controller
board) and ground (you can touch negative
lead of voltmeter to metal frame to obtain
ground.) Is voltage present and correct?
5 On engine controller board, reconnect
MCN9 and disconnect cable from POCN.
On cable disconnected from POCN, check
for 5 VDC from pin 13 to ground (you can
touch negative lead of voltmeter to metal
frame to obtain ground.) Is voltage present
and correct?
Questions / actions
"Engine
Yes
Replace engine controller
board. See "Engine
controller board removal"
on page 4-34. Go step 8.
Problem solved.
Yes
Clean belt marker area with
cotton cloth. If problem
persists, go to step 2.
Replace transfer belt unit.
See "Transfer belt unit
removal" on page 4-5.
Go to step 4.
Engine controller board is
providing 5 VDC to marker
sensor. Replace transfer
belt marker sensor. Marker
sensor is part of a bracket
assembly. See "Bracket
assembly removal" on
page 4-30. If problem
persists, replace engine
controller board. See
"Engine controller board
removal" on page 4-34.
LVPS is providing 5 VDC to
engine controller board.
Replace faulty engine
controller board. See
"Engine controller board
removal" on page 4-34.
7100-XXX
No
Replace cable that
connects ACN1 on LVPS to
POCN on engine controller
board. Remove RIP board
cage to gain access to
cable. See "System board
cage removal" on
page 4-38. Go to step 8.
Contact next level of
support.
No
Go to step 2.
Reinstall transfer belt unit.
Go to step 3.
Properly connect cables. If
problem persists, go to step
4.
Go to step 5.
Replace LVPS. See "Low
voltage power supply
(LVPS) with cage
removal" on page 4-40.
2-17
Diagnostic information