Lexmark 5021-0XX - Manual (Page 148)

2-70 Service Manual
5021-0XX
994—OPC belt marker sensor service check
Step Questions / actions Yes No
1 Remove photodeveloper
cartridge and observe
markers on side. Are belt
markers covered with
foreign particles? Clean marker
area with cotton
cloth. If problem
persists go to
step 2. Go to step 2.
2 Reinstall photodeveloper
cartridge. Turn printer off
and remove I/O board
shield. See
“I/O board
removal” on page 4-70 for
steps to remove I/O board
shield. Are cables DCN5
and DCN13 properly
connected to I/O board?
Go to step 3. Properly connect
cables. If
problem
persists, go to
step 3.
3 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 DCN5
from I/O board. Check for 5
VDC between DCN5 pin 1
(on I/O board) and ground
(you can touch negative
lead of voltmeter to metal
bracket that holds I/O
board to obtain ground.) Is
voltage present and
correct? I/O board is
providing 5 VDC
to marker
sensor. Replace
OPC marker
sensor. See
“Marker sensor
assembly
removal” on
page 4-69
. If
problem
persists, replace
engine controller
board. See
“Engine
controller
board removal”
on page 4-55
.
Go to step 4.