Lexmark C 950 Service Manual

Diagnostic information 2-71
  5058-030
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158.01 Toner dispense motor (Y) failure
3Check the toner dispense motor 
for proper operation.
When performing motor tests, ensure 
that all cover and 
door interlock 
switches are 
overridden.
1. Enter the Diagnostics Menu.
2. Touch MOTOR TESTS.
3. Touch PRINTER MOTOR 
TESTS.
4. Touch M toner dispense 
motor.
 Does the above component 
operate properly (motor 
rotating)?
Go to step 5.Go to step 4.
4Check the toner dispense motor 
for proper...

2-72  Service Manual 5058-030  
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171.01 Controller cooling fan failure
3Check the toner dispense motor 
for proper operation.
When performing motor tests, ensure 
that all cover and 
door interlock 
switches are 
overridden.
1. Enter the Diagnostics Menu.
2. Touch MOTOR TESTS.
3. Touch PRINTER MOTOR 
TESTS.
4. Touch Y toner dispense 
motor.
 Does the above component 
operate properly (motor 
rotating)?
Go to step 5.Go to step 4.
4Check the toner dispense motor 
for proper...

Diagnostic information 2-73
  5058-030
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171.02 Fuser cooling fan failure
172.01 Front upper cooling fan failure
173.01 LVPS sub cooling fan failure 
StepAction and questionsYesNo
1Check the fuser cooling fan.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2Replace the fuser cooling fan. Go 
to “Fuser cooling fan removal” on page 4-90.
 Does the error continue?
Go to step 3.Problem resolved
3POR the machine.
 Does the error continue?
Replace the...

2-74  Service Manual 5058-030  
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174.01 Charge roll HVPS cooling fan failure
175.01 Front right cooling fan failure 
2Replace the LVPS sub cooling 
fan. Go to “LVPS sub cooling fan removal” on page 4-121.
 Does the error continue?
Go to step 3.Problem resolved
3POR the machine.
 Does the error continue?
Replace the lower engine PCBA.
Go to “Lower engine PCBA removal” on page 4-101.
Problem resolved
StepAction and questionsYesNo
1Check the charge roll HVPS 
cooling fan.
 Is the above...

Diagnostic information 2-75
  5058-030
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175.03 PC/developer drive motor cooling fan failure 
175.04 Front left cooling fan failure 
175.05 Suction fan failure 
StepAction and questionsYesNo
1Check the PC/developer drive 
motor cooling fan.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2Replace the PC/developer drive 
motor cooling fan. Go to “PC/developer drive motor cooling fan removal” on page 4-142.
 Does the error continue?
Go to step...

2-76  Service Manual 5058-030  
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Next175.06 Center exhaust fan failure
175.07 Fuser driver PCBA cooling fan failure
175.08 Upper exhaust cooling fan failure 
3POR the machine.
 Does the error continue?
Replace the upper printer engine 
PCBA.
Go to “Upper printer engine PCBA removal” on page 4-184.
Problem resolved
StepAction and questionsYesNo
1Check the center exhaust fan.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2Replace the center exhaust fan....

Diagnostic information 2-77
  5058-030
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191.01 Lower engine PCBA detect failure
191.02–191.05 Upper engine PCBA fuse blown
2Replace the upper exhaust fan. 
Go to “Upper exhaust cooling fan removal” on page 4-190.
 Does the error continue?
Go to step 3.Problem resolved
3POR the machine.
 Does the error continue?
Replace the upper printer engine 
PCBA.
Go to “Upper printer engine PCBA removal” on page 4-184.
Problem resolved
StepAction and questionsYesNo
1POR the machine.
 Does the...

2-78  Service Manual 5058-030  
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191.06 Lower engine PCBA fuse 2 blown
191.07 Lower engine PCBA fuse 3 blown
191.08 Lower engine PCBA fuse 4 blown
StepAction and questionsYesNo
1Warning: Remove the cause of 
blown fuse before replacing the 
lower engine PCBA.
Check the following parts circuits 
for overcurrent and overvoltage.
• LED printhead (Y, M, C, K) 
• Printhead interface contact 
(Y, M, C, K) 
 Are the current and voltage 
values normal?
Go to step 2.Replace the faulty parts....

Diagnostic information 2-79
  5058-030
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191.09 Upper engine PCBA fuse 5 blown
191.10 Lower engine PCBA fuse 6 blown
191.11 Lower engine PCBA fuse 7 blown
StepAction and questionsYesNo
1Warning: Remove the cause of 
blown fuse before replacing the 
lower engine PCBA.
Check the finisher circuit for 
overcurrent and overvoltage.
 Are the current and voltage 
values normal?
Go to step 2.Replace the faulty parts, or repair 
the circuits.
2POR the machine.
 Does the error continue?
Replace...

2-80  Service Manual 5058-030  
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191.12 Lower engine PCBA fuse 8 blown
191.13 Lower engine PCBA fuse 9 blown
2POR the machine.
 Does the error continue?
Replace the lower engine PCBA.
Go to “Lower engine PCBA removal” on page 4-101.
Problem resolved
StepAction and questionsYesNo
1Warning: Remove the cause of 
blown fuse before replacing the 
lower engine PCBA.
Check the following parts circuits 
for overcurrent and overvoltage:
• MPF tray feeder motor.
• Upper redrive motor.
• Duplex...