121.03 Thermistor 3 3 error
Step
Action and questions
1
Is the fuser properly installed? Make sure that it is
properly seated.
2
Is the fuser cable properly connected to CN19 on the
printhead controller board?
3
Check the fuser cable for continuity. Is there
continuity?
4
Replace the printhead controller board. Does this fix
the problem?
5
Replace the fuser. Does this fix the problem
121.04 Belt thermistor error
Step
Action and questions
1
Is the fuser properly installed? Make sure that it is
properly seated.
2
Is the fuser cable properly connected to CN19 on the
printhead controller board?
3
Check the fuser cable for continuity. Is there
continuity?
4
Replace the printhead controller board. Does this fix
the problem?
Replace the fuser. Does this fix the problem
5
Note: If the error is 121.05., the fuser is at the end of life.
Yes
No
Go to step 2.
Reinstall the
fuser.
Go to step 3.
Properly connect
the connector.
Problem solved
Replace the fuser
cable.
Problem solved
Go to step 5.
Problem solved
Contact second
level support.
Yes
No
Go to step 2.
Reinstall the
fuser.
Go to step 3.
Properly connect
the connector.
Problem solved
Replace the fuser
cable.
Problem solved
Go to step 5.
Problem solved
Contact second
level support.
Diagnostic information
7541-03x
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