2-76 Service Manual
5021-0XX
3 Turn printer on. Check for 5
VDC between front cover
interlock switch pin 1 (top
pin) and ground. Is 5 VDC
present?
Go to step 5. Go to step 4.
4 Turn printer off and check
cable for continuity
between LVPS ACN2 pin 1
and cable that connects to
front cover interlock switch
pin 1. Is cable okay?
Replace LVPS.
See “Low
voltage power
supply (LVPS)
with cage
removal” on
page 4-60.
Replace cable.
5 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. Is
cable properly connected
to I/O board connector
DCN18?
Go to step 6. Properly connect
cable.
6 Turn printer on and
override front cover
interlock switch. Check for
5 VDC between I/O board
DCN18 pin 3 and ground.
Is 5 VDC present?
Go to step 7. Go to step 8.
7 Override top cover interlock
switch in addition to front
cover interlock switch.
Check for 5 VDC between
I/O board DCN18 pin 1 and
ground. Is 5 VDC present?
Replace I/O
board. See “I/O
board removal”
on page 4-70. If
problem
persists, replace
engine controller
board. See
“Engine
controller
board removal”
on page 4-55.
Go to step 8.
Step Questions / actions Yes No
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