Lexmark OptraTM Service Manual page 41

4026-0XX
FRU
3 Thermistor
4 Fuser Lamp
Cable
5 Fuser Ther-
mostat (4026-
06C and 06F)
Action
If the fuser lamp comes on and a fuser failure
LED error code displays, be sure the thermistor
is contacting the hot roll and the thermistor
cable is firmly seated in connector CN2 on the
engine board.
Check for excessive toner buildup on the surface
of the thermistor. Clean or replace as necessary.
Turn the printer power off and disconnect the
thermistor cable from CN2 on the engine board.
Measure the resistance of the thermistor
between CN2-1 and CN2-2. The resistance
should measure 250K ohms or less. If incorrect,
replace the thermistor and cable assembly. If
correct, replace the engine board.
Note: The thermistor assembly is fragile. Use
care when handling to avoid damage.
If the fuser lamp does not come on and a fuser
failure LED error code displays, unplug the
printer power cord and check the continuity
between the fuser cable contacts in the lower
fuser cover. If incorrect, check the continuity of
the fuser lamp, thermal fuse and terminals.
Repair or replace as necessary. If correct, check
the continuity of the fuser lamp cable. If incor-
rect, replace the cable. If correct, replace the fol-
lowing FRUs one at a time in the order shown:
Engine Board
LVPS
If the lamp does not come on and the Error LED
is on solid, go to the
page 2-17
Check the fuser thermostat if the fuser lamp
does not come on or if it comes on and does not
go off. Unplug the printer power cord and check
the thermostat to be sure that it opens and
closes properly. Replace as necessary.
"Fan Service Check" on
Diagnostic Information 2-19