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2-90 Service Manual
923.xx—Hot fuser service check
Error Code 923.xx, 924.xx, and 925.xx may display for a hot fuser failure.
CAUTION: .The fuser may be hot, use caution before removing or servicing.
CAUTION: There is a danger from hazardous voltage in the area of the printer where you are
working. Unplug the printer before you begin, or use caution if the printer must receive power in
order to perform the task.
Service tip: Set the Fuser Temperature to NORMAL before starting this service check. In Diagnostics mode, In
Diagnostics mode, select EP SETUP, and Fuser Temp.
6
Fuser assembly If no problem is found up to this point, then replace the following in
the order shown:
• Fuser assembly. See “Fuser assembly removal” on page 4-26.
• System board assembly. See “System board and inner shield
removal” on page 4-76.
• LVPS. See “Low voltage power supply removal” on
page 4-54.
FRU Action
1 Fuser assembly Check for any signs of overheating in the fuser assembly. Check the
hot roll, hot roll bearings, and the area around the thermistor for any
signs of excessive heat. If a problem is found, replace the thermistor.
If no problem is found, go to step 2.
2
Fuser top cover assembly
(thermistor)
Turn the printer off and disconnect the fuser to system board cable
from J10 on the system board. Check the resistance between pins
J10-3 and J10-4. The resistance should be greater than 100K ohms.
If correct, go to step 3; if incorrect, disconnect the thermistor cable
from J5 on the fuser board and measure the resistance between the
two pins on the thermistor cable. If incorrect, replace the fuser top
cover assembly (see “Fuser narrow media sensor removal” on
page 4-34); if correct, replace the fuser to system board cable.
3
System board
Fuser top cover assembly
Check the voltage on J10-3 ground on the system board. The voltage
should measure approximately +3.3 V dc. If the voltage is correct,
replace the fuser top cover assembly. See “Fuser narrow media
sensor removal” on page 4-34. If incorrect, replace the system
board. See “System board and inner shield removal” on
page 4-76.
FRU Action