Diagnostic information 2-47
7541-03x
121.03 Thermistor 3 3 error
Note: If the error is 121.05., the fuser is at the end of life.
121.04 Belt thermistor error
Step Action and questions Yes No
1 Is the fuser properly installed? Make sure that it is
properly seated.
Go to step 2. Reinstall the
fuser.
2
Is the fuser cable properly connected to CN19 on the
printhead controller board?
Go to step 3. Properly connect
the connector.
3
Check the fuser cable for continuity. Is there
continuity?
Problem solved Replace the fuser
cable.
4
Replace the printhead controller board. Does this fix
the problem?
Problem solved Go to step 5.
5
Replace the fuser. Does this fix the problem Problem solved Contact second
level support.
Step Action and questions Yes No
1 Is the fuser properly installed? Make sure that it is
properly seated.
Go to step 2. Reinstall the
fuser.
2
Is the fuser cable properly connected to CN19 on the
printhead controller board?
Go to step 3. Properly connect
the connector.
3
Check the fuser cable for continuity. Is there
continuity?
Problem solved Replace the fuser
cable.
4
Replace the printhead controller board. Does this fix
the problem?
Problem solved Go to step 5.
5
Replace the fuser. Does this fix the problem Problem solved Contact second
level support.
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