Lexmark C950 - Upper Exhaust Cooling Fan Failure; Lower Engine PCBA Detect Failure; 191.05 Upper Engine PCBA Fuse Blown

2-74 Service Manual
5058-030
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175.08 Upper exhaust cooling fan failure
191.01 Lower engine PCBA detect failure
191.02–191.05 Upper engine PCBA fuse blown
2
Replace the fuser driver PCBA
cooling fan.
Does the error continue?
Go to step 3. Problem resolved
3
POR the machine.
Does the error continue?
Replace the lower engine PCBA.
Go to “Lower engine PCBA
removal” on page 4-98.
Problem resolved
Step Action and questions Yes No
1 Check the upper exhaust fan.
Is the above component
properly connected?
Go to step 2. Replace the connections.
2
Replace the upper exhaust fan.
Go to “Upper exhaust cooling
fan removal” on page 4-187.
Does the error continue?
Go to step 3. Problem resolved
3
POR the machine.
Does the error continue?
Replace the upper printer engine
PCBA.
Go to “Upper printer engine
PCBA removal” on page 4-181.
Problem resolved
Step Action and questions Yes No
1 POR the machine.
Does the error remain?
Go to step 2. Problem resolved
2
Check the lower engine PCBA.
Is the above component
properly connected?
Replace the lower engine PCBA.
Go to “Lower engine PCBA
removal” on page 4-98.
Go to step 2.
Replace the connections.
3
POR the machine.
Does the error continue?
Replace the upper printer engine
PCBA.
Go to “Upper printer engine
PCBA removal” on page 4-181.
Problem resolved
Step Action and questions Yes No
1 POR the machine.
Does the error remain?
Go to step 2. Problem resolved
Step Action and questions Yes No