Opc Belt Marker Sensor Service Check - Lexmark X500n Service Manual

7100-XXX

OPC belt marker sensor service check

Step
1 Remove photodeveloper cartridge and
check for defects. Does photodeveloper
appear okay?
2 Observe markers on side. Are belt markers
covered with foreign particles?
3 Reinstall photodeveloper cartridge. Turn
printer off, and remove engine controller
board shield. See
board removal" on page 4-34
remove engine controller board shield. Is
cables MCN7 properly connected to engine
controller board?
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 MCN7 from
engine controller board. Check for 5 VDC
between MCN7 pin 3 (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 Reconnect MCN7, and disconnect cable
from POCN. On disconnected cable, check
for 5 VDC on cable pin corresponding to
POCN pin 13. You can touch negative lead
of voltmeter to metal frame to obtain ground.
Is voltage present and correct?
6 Turn printer off. Disconnect cable that
connects LVPS ACN1 to engine controller
board POCN, and check for continuity,
shorted pins, or any other cable damage. Is
cable okay?
2-20
Service Manual
Questions / actions
"Engine controller
for steps to
Yes
Go to step 2.
Clean marker area with
cotton cloth. If problem
persists, go to step 3.
Go to step 3.
Engine controller board is
providing 5 VDC to OPC
sensor. Replace OPC
marker sensor. See
"Marker sensor assembly
removal" on page 4-46. 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 engine controller
board. See "Engine
controller board removal"
on page 4-34.
Replace LVPS. See "Low
voltage power supply
(LVPS) with cage
removal" on page 4-40.
No
Replace photodeveloper
cartridge.
Go to step 3.
Properly connect cable. If
problem persists, go to step
4.
Go to step 5.
Go to step 6.
Replace cable.