Xx—Hot Fuser Service Check - Lexmark X642e Service Manual

7002-xxx
924.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 product where you are working.
Unplug the product before you begin, or use caution if the product 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.
FRU
1 Fuser assembly
Fuser to system board
cable
2 Fuser top cover assembly
(thermistor/thermistor cable
assembly)
3 Fuser to system board
cable.
System board
Fuser assembly
2-136
Service Manual
Action
Check the thermistor cable for correct installation to J5 on the fuser
card. If installed correctly, check for correct installation of J10 on the
system board. If all cables are installed correctly, go to step 2.
Turn the printer off and disconnect the thermistor cable from J5 on
the fuser board. Measure the resistance between the two pins on the
thermistor cable, if the resistance measures infinity (open circuit),
replace the fuser top cover assembly.
Reconnect the thermistor cable to J5 on the fuser board. Disconnect
the fuser to system board cable from J10 on the system board and
measure the resistance between J10-3 and J10-4 on the cable. If the
resistance measures infinity (open circuit) check the continuity of pins
3 and 4 of the cable. If correct, replace the fuser assembly. See
"Fuser assembly removal" on page
fuser to system board cable.
Note: If the error code still displays, replace the system board. See
"System board and inner shield removal —models X644e/
X646e" on page 4-131.
4-79. If incorrect, replace the