Lexmark C 950 Service Manual

							Diagnostic information 2-71
  5058-030
Go Back Previous
Next
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 connection.
 Is the above component 
properly connected?
Replace the toner dispense 
motor. Go to “Toner dispense motor removal” on page 4-166.
Replace the connections.
5POR 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
1Replace the toner cartridge.
 Does the error remain?
Go to step 2.Problem resolved
2Check the toner smart chip PCB.
 Is the above component 
properly connected?
Go to step 3.Replace the connections.
Step Action and questions Yes No 
						

							2-72  Service Manual 5058-030  
Go Back Previous
Next
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 connection.
 Is the above component 
properly connected?
Replace the toner dispense 
motor. Go to “Toner dispense motor removal” on page 4-166.
Replace the connections.
5POR 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 controller cooling fan.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2Replace the controller cooling 
fan. Go to “Controller cooling fan removal” on page 4-47.
 Does the error continue?
Go to step 3.Problem resolved
3POR the machine.
 Does the error continue?
Replace the lower printer engine 
PCBA.
Go to “Lower engine PCBA removal” on page 4-109.
If the error remains go to step 4.
Problem resolved
4POR 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
Step Action and questions Yes No 
						

							Diagnostic information 2-73
  5058-030
Go Back Previous
Next
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 lower printer engine 
PCBA.
Go to “Lower engine PCBA removal” on page 4-109.
If the error remains go to step 4.
Problem resolved
4POR 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 front upper cooling fan.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2Replace the front upper cooling 
fan. Go to “Front upper cooling fan removal” on page 4-88.
 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
1Check the LVPS sub cooling fan.
 Is the above component 
properly connected?
Go to step 2.Replace the connections. 
						

							2-74  Service Manual 5058-030  
Go Back Previous
Next
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 component 
properly connected?
Go to step 2.Replace the connections.
2Replace the charge roll HVPS 
cooling fan. Go to “Charge roll HVPS cooling fan removal” on page 4-41.
 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 front right cooling fan.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2Replace the front right cooling 
fan. Go to “Front right cooling fan removal” on page 4-86.
 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
Step Action and questions Yes No 
						

							Diagnostic information 2-75
  5058-030
Go Back Previous
Next
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 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
1Check the front left cooling fan.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2Replace the front left cooling fan. 
Go to “Front left cooling fan removal” on page 4-84.
 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
1Check the suction fan.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2Replace the suction fan. Go to “Suction fan removal” on page 4-173.
 Does the error continue?
Go to step 3.Problem resolved 
						

							2-76  Service Manual 5058-030  
Go Back Previous
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. 
Go to “Center exhaust fan removal” on page 4-34.
 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 fuser driver PCBA 
cooling fan.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2Replace the fuser driver PCBA 
cooling fan. Go to “Fuser driver PCBA cooling fan removal” on page 4-84.
 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 upper exhaust fan.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
Step Action and questions Yes No 
						

							Diagnostic information 2-77
  5058-030
Go Back Previous
Next
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 error remain?
Go to step 2.Problem resolved
2Check the lower engine PCBA.
 Is the above component 
properly connected?
Replace the lower engine PCBA.
Go to “Lower engine PCBA removal” on page 4-101.
Go to step 2.
Replace the connections.
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 error remain?
Go to step 2.Problem resolved
2POR 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
Step Action and questions Yes No 
						

							2-78  Service Manual 5058-030  
Go Back Previous
Next
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. 
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:
• Tray module controller PCBA
• HCF 
 Are the current and voltage 
values normal?
Go to step 2.Replace the faulty parts. 
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:
• Tray module controller PCBA
• HCF 
 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 the lower engine PCBA.
Go to “Lower engine PCBA removal” on page 4-101.
Problem resolved 
						

							Diagnostic information 2-79
  5058-030
Go Back Previous
Next
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 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:
• Media transport/MPF drive 
motor 
• Media feed lift motor
• Fuser pressure roll retract 
motor
• Waste toner agitator motor
 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 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:
• Fuser cooling fan 
• LVPS cooling fan 
• Rear left exhaust fan 
• Rear upper cooling fan
• Front right cooling fan
 Are the current and voltage 
values normal?
Go to step 2.Replace the faulty parts, or repair 
the circuits. 
						

							2-80  Service Manual 5058-030  
Go Back Previous
Next
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 motor.
 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 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 toner dispense motor 
(Y, M, C, K) 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 the lower engine PCBA.
Go to “Lower engine PCBA removal” on page 4-101.
Problem resolved
Step Action and questions Yes No