Lexmark X502N - Power Supply Fan Service Check; Fuser Fan Service Check

2-22 Service Manual
7100-XXX
Power supply fan service check
Fuser fan service check
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 engine controller board
shield. Is cable properly connected to
engine controller board connector MCN10?
Go to step 2. Properly connect cable.
2 Ensure rear cover assembly cover is shut.
Override top and front cover interlock
switches. For location, see “Fan/motor and
interlock switch locations” on page 5-6.
Turn printer on, and check for 24VDC
between engine controller board MCN10 pin
1 and power ground (you can touch
negative lead of voltmeter to metal frame to
obtain ground.) Is voltage present and
correct?
Replace power supply fan
assembly. See “Power
supply fan removal” on
page 4-48. Retest printer. If
error clears, problem
solved, otherwise go to step
3.
Go to step 3.
3 Turn printer off, and disconnect cable from
engine controller board MCN10 and power
supply fan. Check cable for continuity and
pin shorts. Is cable okay?
Replace engine controller
board. See “Engine
controller board removal”
on page 4-34.
Replace cable.
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 engine controller board
shield. Is cable properly connected to
engine controller board connector MCN1?
Go to step 2. Properly connect cable.
2 Ensure rear cover assembly cover is shut.
Override top and front cover interlock
switches. For location, see “Fan/motor and
interlock switch locations” on page 5-6.
Reconnect operator panel. Turn printer on,
and check for 24VDC between engine
controller board MCN1 pin 4 and power
ground (you can touch negative lead of
voltmeter to metal frame to obtain ground.)
Is voltage present and correct?
Potentially faulty fuser fan.
Replace rear cover
assembly. See “Rear
cover assembly removal”
on page 4-14. Retest
printer. If error clears,
problem solved, otherwise
go to step 3.
Go to step 3.
3 Turn printer off, and disconnect cable from
engine controller board MCN1 and power
supply fan. Check cable for continuity and
pin shorts. Is cable okay?
Replace engine controller
board. See “Engine
controller board removal”
on page 4-34.
Replace cable.