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2-49 4059 Service Manual
4059-XXX
2 Fuser Lamp 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 thefuser
assembly and check the continuity of
the lamp. If incorrect, replace the
lamp. If correct, replace the fuser
cover assembly.
3LVPSandACFuserLamp
Cable
Turn the printer off. Disconnect the
fuser lamp connector at the fuser
assembly. Turn the printer on and
check across the pins on LVPS end
of the cable for line voltage. If
incorrect, turn the printer off and
disconnect the power cord and
check the continuity of the AC fuser
lamp cable. If incorrect, replace the
cable. If correct, replace the LVPS.
4 Fuser Top Cover Assembly
(Thermal Fuse/Thermistor
Assembly)
Disconnect thethermistor 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
FRU Action