Lexmark C 950 Service Manual

							Diagnostic information 2-51
  5058-030
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121.09  Fuser temperature lag error
3Replace the fuser assembly. See “Fuser assembly removal” on page 4-81.
 Does the error remain?
Go to step 4.Problem resolved
4Check the fuser driver for poor 
connection or damaged 
connector.
 Is the fuser driver properly 
connected?
Go to step 5.Replace the connection.
5Replace the fuser driver. See “Fuser driver PCBA removal” on page 4-87.
 Does the error remain?
Go to step 6.Problem resolved
6Check the sub-LVPS for poor 
connection or damaged 
connector.
 Is the component properly 
connected?
Go to step 7.Replace the connection.
7Replace the sub-LVPS. See “Sub LVPS PCBA removal” on page 4-161.
 Does the error remain?
Go to step 8.Problem resolved
8Check the LVPS for poor 
connection or damaged 
connector.
 Is the component properly 
connected?
Go to step 9.Replace the connection.
9Replace the LVPS. See “LVPS PCBA removal” on page 4-109.Call the next level of support.Problem resolved
StepAction and questionsYesNo
1Check the fuser assembly.
 Is the above component 
properly connected?
Go to step 2.Remove foreign particles, and 
replace the connections.
2Replace the fuser assembly. Go 
to “Fuser assembly removal” on page 4-81.
 Does the error remain?
Go to step 3.Problem resolved
Step Action and questions Yes No 
						

							2-52  Service Manual 5058-030  
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Next121.10  Heat belt rotation failure
121.11  Fuser temperature recovery 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 fuser assembly.
 Is the above component 
properly connected?
Go to step 2.Remove foreign particles, and 
replace the connections.
2Replace the fuser assembly. Go 
to “Fuser assembly removal” on page 4-81.
 Does the error remain?
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 assembly.
 Is the above component 
properly connected?
Go to step 2.Remove foreign particles, and 
replace the connections.
2Replace the fuser assembly. Go 
to “Fuser assembly removal” on page 4-81.
 Does the error remain?
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
Step Action and questions Yes No 
						

							Diagnostic information 2-53
  5058-030
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121.12 Fuser failure
121.13 Fuser thermostat failure 
126.01 Fuser driver interface failure
StepAction and questionsYesNo
1POR the machine.
 Does the error continue?
Go to step 2.Problem resolved
2Replace the fuser assembly. Go 
to “Fuser assembly removal” on page 4-81.
Does the error continue?
Replace the fuser drive PCBA. 
Go to “Fuser driver PCBA removal” on page 4-87.
Does the error continue?
Problem resolved
StepAction and questionsYesNo
1Check the fuser assembly.
 Is the above component 
properly connected?
Go to step 2.Remove foreign particles, and 
replace the connections.
2Replace the fuser assembly. Go 
to “Fuser assembly removal” on page 4-81.
 Does the error remain?
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 fuser driver PCBA.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2Replace the fuser driver PCBA. 
Go to “Fuser driver PCBA removal” on page 4-87.
 Does the error remain?
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 
						

							2-54  Service Manual 5058-030  
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126.02 Fuser driver to upper engine PCBA interface failure
126.03 Fuser driver communication failure
126.04 Fuser driver freeze failure
StepAction and questionsYesNo
1Check the fuser driver PCBA.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2POR the machine.
 Does the error continue?
Go to step 3.Problem resolved
3Replace the upper printer engine 
PCBA.
Go to “Upper printer engine PCBA removal” on page 4-184.
 Does the error continue?
Replace the fuser driver PCBA. 
Go to “Fuser driver PCBA removal” on page 4-87.
Problem resolved
StepAction and questionsYesNo
1Remove the sub LVPS PCBA. Go 
to “Sub LVPS PCBA removal” on page 4-161.
Check the fuser driver PCBA.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2Replace the fuser driver PCBA. 
Go to “Fuser driver PCBA removal” on page 4-87.
 Does the error remain?
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
1Remove the sub LVPS PCBA. Go 
to “Sub LVPS PCBA removal” on page 4-161.
Check the fuser driver PCBA.
 Is the above component 
properly connected?
Go to step 2.Replace the connections. 
						

							Diagnostic information 2-55
  5058-030
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126.05 Fuser driver high voltage error
126.06 Fuser driver low voltage error
126.07 Fuser driver surge failure
2Replace the fuser driver PCBA. 
Go to “Fuser driver PCBA removal” on page 4-87.
 Does the error remain?
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
1Remove the fuser cooling fan. Go 
to “Fuser cooling fan removal” on page 4-81.
Replace the fuser driver PCBA. 
Go to “Fuser driver PCBA removal” on page 4-87.
 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
StepAction and questionsYesNo
1Remove the fuser cooling fan. Go 
to “Fuser cooling fan removal” on page 4-81.
Replace the fuser driver PCBA. 
Go to “Fuser driver PCBA removal” on page 4-87.
 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
StepAction and questionsYesNo
1POR the machine.
 Does the error continue?
Replace the fuser driver PCBA. 
Go to “Fuser driver PCBA removal” on page 4-87.
Problem resolved
Step Action and questions Yes No 
						

							2-56  Service Manual 5058-030  
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126.08 IGBT high temperature error
126.09 IGBT temperature sensor failure
126.12 Input low current error
StepAction and questionsYesNo
1Check the fuser driver PCBA.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2Replace the fuser driver PCBA. 
Go to “Fuser driver PCBA removal” on page 4-87.
 Does the error remain?
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 fuser driver PCBA.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2Replace the fuser driver PCBA. 
Go to “Fuser driver PCBA removal” on page 4-87.
 Does the error remain?
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
1Remove the sub LVPS PCBA. Go 
to “Sub LVPS PCBA removal” on page 4-161.
Check the fuser driver PCBA.
 Is the above component 
properly connected?
Go to step 2.Replace the connections.
2Replace the fuser driver PCBA. 
Go to “Fuser driver PCBA removal” on page 4-87.
 Does the error remain?
Go to step 3.Problem resolved 
						

							Diagnostic information 2-57
  5058-030
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132.01 ATC sensor (K) failure
3Replace the fuser assembly. Go 
to “Fuser assembly removal” on page 4-81.
 Does the error remain?
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 path from the toner 
cartridge to the developer.
 Is the above component free 
from obstacles?
Go to step 2.Remove the toner blockages, 
including internal clogs inside the 
developer and toner cartridge.
2Check the ATC sensor PCB.
 Is the above component 
properly connected?
Go to step 3.Replace the connections.
3Remove the ATC sensor PCB. 
Go to “ATC sensor PCB removal” on page 4-26.
 Does the error remain?
Go to step 4.Problem resolved
4Check 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 K toner dispense 
motor.
 Does the above component 
operate properly?
Go to step 6.Go to step 5.
5Check 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.
Step Action and questions Yes No 
						

							2-58  Service Manual 5058-030  
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132.02 ATC sensor (Y) failure
6Check the developer 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 Developer motor.
 Does the above component 
operate properly?
Go to step 8.Go to step 7.
7Check the developer motor for 
proper connection.
 Is the above component 
properly connected?
Replace the PC/developer drive 
motor. 
Go to “PC/developer drive motor removal” on page 4-135.
Replace the connection.
8POR the machine.
 Does the error continue?
Replace the lower engine PCBA.
Go to “Lower engine PCBA removal” on page 4-101.
Go to step 9.
Problem resolved
9POR 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 path from the toner 
cartridge to the developer.
 Is the above component free 
from obstacles?
Go to step 2.Remove the toner blockages, 
including internal clogs inside the 
developer and toner cartridge.
2Check the ATC sensor PCB.
 Is the above component 
properly connected?
Go to step 3.Replace the connections.
3Remove the ATC sensor PCB. 
Go to “ATC sensor PCB removal” on page 4-26.
 Does the error remain?
Go to step 4.Problem resolved
Step Action and questions Yes No 
						

							Diagnostic information 2-59
  5058-030
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4Check 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?
Go to step 6.Go to step 5.
5Check 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.
6Check the developer 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 Developer motor.
 Does the above component 
operate properly?
Go to step 8.Go to step 7.
7Check the developer motor for 
proper connection.
 Is the above component 
properly connected?
Replace the PC/developer drive 
motor. 
Go to “PC/developer drive motor removal” on page 4-135.
Replace the connection.
8POR the machine.
 Does the error continue?
Replace the lower engine PCBA.
Go to “Lower engine PCBA removal” on page 4-101.
Go to step 9.
Problem resolved
9POR 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 
						

							2-60  Service Manual 5058-030  
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132.03 ATC sensor (M) failure
StepAction and questionsYesNo
1Check the path from the toner 
cartridge to the developer.
 Is the above component free 
from obstacles?
Go to step 2.Remove the toner blockages, 
including internal clogs inside the 
developer and toner cartridge.
2Check the ATC sensor PCB.
 Is the above component 
properly connected?
Go to step 3.Replace the connections.
3Remove the ATC sensor PCB. 
Go to “ATC sensor PCB removal” on page 4-26.
 Does the error remain?
Go to step 4.Problem resolved
4Check 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?
Go to step 6.Go to step 5.
5Check 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.
6Check the developer 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 Developer motor.
 Does the above component 
operate properly?
Go to step 8.Go to step 7.