Lexmark Optra T 4069 series Service Manual page 77

4069-XXX
FRU
1 Fuser Lamp (Incorrect
Lamp/925 Service Error)
2 Fuser Lamp
3 LVPS
LVPS to Fuser Auto
Docking Connector
Fuser AC Cable
4 Fuser Top Cover Assembly
(Thermal Fuse/Thermistor
Assembly)
2-48
Service Manual
Action
Install the correct voltage and
wattage lamp or fuser assembly.
Remove the controller board. Run
the Diagnostic Print Test and
observe the lamp through the left
side frame. If the lamp doesn't come
on, unplug the printer and check the
continuity between the two pins on
the fuser lamp cable going to the
fuser assembly. If you do not
measure continuity, remove the fuser
assembly and check the continuity of
the lamp. If incorrect, replace the
lamp. If correct, replace the fuser
cover assembly.
Turn the printer off. Remove the
fuser assembly. Turn the printer
power on. Measure across the AC
fuser cable pins for line voltage with
the cable connected. If incorrect,
turn the printer off and disconnect
the power cord. Check the continuity
of the LVPS to fuser AC cable. If
incorrect, replace the cable. If
correct, replace the LVPS.
Disconnect the thermistor cable from
the fuser board at J2. The resistance
is as follows:
HOT - J2-1 - J2-2 = 2.5K ohms
COLD = 150K ohms to 260K ohms