Specifications

3
Flowcharts and TablesTroubleshooting
Fuser Assembly Failure (Continued)
Step Check Result Action
4 Measure the resistance
between pins J101-2 and
J101-6 on the fuser
assembly. Is the resistance
less than 10 Ω ?
No Replace the fuser heater bulb and the
thermoprotector.
5 Connect a multimeter
between pins P11-1 (HEAT,
red wire) and P11-2 (GND,
black wire). Does the
voltage measure about
+4.2 VDC when you switch
on the printer?
No Replace the power supply.
6 Connect a multimeter
between connector pins
P11-1 (HEAT, red wire) and
P11-2 (GND, black wire) on
the DC controller board.
When you open and close
the front access door, does
the voltage measure about
+3.7 VDC with the door
open and briefly drop to
0 VDC about five seconds
after you close the door?
No Go to Table 9, Temperature Sensor
Assembly Failure.
7 Switch off the printer and
disconnect P111 from the
high-voltage power supply.
Connect a multimeter
between connector pins
P11-5 (5 VB, yellow wire)
and P11-2 (GND, black
wire) on the DC controller
board. Does the voltage
measure about +5 VDC
when you switch on the
printer?
No Replace the power supply.