3-72 Troubleshooting Analysis Guide (TAGs)
TAG 071: Open Fuser Thermistor
Error Code: 071
Possible Defects: Connectors or wiring
Fuser unit
PCL board
1
Turn the printer off and unplug the power cord.
• Make sure the fuser unit is installed properly.
• Confirm that J/P41 and J/P44 are connected properly.
Has the fuser unit been replaced recently?
No: Continue.
Yes: Go to #3 in this TAG.
2
Replace the fuser unit.
• Power-on-reset the printer.
Is error code 071 displayed during power-on-reset?
No: The fuser unit was at fault. Turn to TAG 002: Check & Problem Resolution.
Yes: Reinstall the original fuser unit and continue.
3
Turn the printer off and unplug the power cord.
• Disconnect J/P41.
• Remove the fuser unit.
• Check P41-21 to P5-7 and P41-22 to P5-6 for continuity.
Is there continuity on both?
No: Repair or replace the connectors or wiring as necessary, then turn to TAG 002: Check &
Problem Resolution.
Yes: Continue.
4
Check P41-21 and P41-22 for continuity to ground.
Is there continuity to ground on either?
No: Replace the fuser unit. If this resolves the problem, then turn to TAG 002: Check & Prob-
lem Resolution. If this does not resolve the problem, replace the PCL board, then turn to
TAG 002: Check & Problem Resolution.
Yes: Repair or replace the connectors or wiring that have continuity to ground:
P41-21 to P44-2,
J44-2 to P5-7, or
P41-22 to P44-1, J44-1 to P5-6;
then turn to TAG 002: Check & Problem Resolution.
