Diagnostic information 2-11
5056-XXX
920 - Fuser Error–Fuser Heater Trouble
923 - Upper Fuser Thermistor Open Error
924 - Lower Fuser Thermistor Open Error
92x Service
Fuser Error
Step Questions/actions Yes No
1 Replace the fuser. Did this fix the problem? Problem solved. Return the fuser,
replace the
power supply 2,
and go to step 2.
2
Did replacing power supply 2 fix the problem? Problem solved. Return power
supply 2, and
replace the
printer controller
board.
Step Questions/actions Yes No
1 Is connector CN19 on the printer controller board
connected properly?
Disconnect CN19
and turn the
printer on.
Go to step 2.
Plug the
connector in
securely.
2
Is error 923 displayed? Power off, and
reconnect CN19.
Go to step 3.
Replace the
printer controller
board.
3
Power the printer off and short-circuit pins (1 and 2)
and (3 and 4) of CN19 and power on. Is error 923
displayed?
Replace the
fuser.
Replace the
printer controller
board.
Step Questions/actions Yes No
1 Turn off the printer and reinstall the fuser, making sure
it clicks into place. Turn on the printer.
Did this resolve the problem?
Problem solved. Go to step 2.
2
Is connector CN19 on the printer controller board
connected properly?
Disconnect
CN19, and turn
the printer on.
Go to step 3.
Plug the
connector in
securely.
3
Is error 924 displayed? Turn the printer
off, and
reconnect CN19.
Go to step 4.
Replace the
printer controller
board.
4 Turn off the printer and short-circuit pins 8 and 9 of
CN19. Turn on the printer.
Is error 924 displayed?
Replace the
fuser.
Replace the
printer controller
board.
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