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Troubleshooting Analysis Guide (TAGs) 3-73
TAG 072: Fuser Unit Temperature Too High
Error Code: 072
Possible Defects: Connectors or wiring
Fuser unit
AC power supply unit
PCL board
The conditions that cause error code 072 often cause the fuser unit’s thermal fuse to open.
This usually necessitates replacement of the fuser unit.
1
Turn the printer off and unplug the power cord.
• Verify that J/P44, J/P40, J/P10, J/P70, and J/P8 are connected properly.
• Make sure the fuser unit is properly installed.
• Read the following steps before taking further actions.
• Power-on-reset the printer.
• Watch through the output tray opening to see if the fuser lamp comes on.
• If the fuser lamp comes on immediately after power on, turn off the printer and replace the AC
power supply.
• Run test prints.
Has the problem been resolved?
No: Continue.
Yes: A loose connector was at fault. Turn to TAG 002: Check & Problem Resolution.
2
Has the fuser unit been replaced recently?
No: Continue.
Yes: Go to #4 in this TAG.
3
Replace the fuser unit.
• Power-on-reset the printer.
• Watch through the output tray opening to see if the fuser lamp comes on during the 15 seconds
after the output tray jogging test.
• If the fuser lamp comes on immediately after power on, turn off the printer and replace the AC
power supply.
Has the problem been resolved?
No: Reinstall the original fuser unit and continue.
Yes: The fuser unit was at fault. Turn to TAG 002: Check & Problem Resolution.
4
Power-on-reset the printer.
• Watch the fuser unit’s lamp.
Does the lamp turn on before error code 072 is displayed?
No: Replace the PCL board, then turn to TAG 002: Check & Problem Resolution.
Yes: Continue.