Xerox 3050 Service Manual page 184

LL.44 Fuser Too Hot RAP
(6Iltg 1)
This RAP i s used when the Fuser temperature
exceeds
420
degrees
F.
(216 degrees C), the
maximum allowed temperature.
The status code may also be displayed i f the
Temperature Limit Thermistor (RT2) has a
malfunction or is contaminated, or i f there i s
a fault i n the wires between the Control PWB
and the Thermistor Assembly.
Initial Actions
Allow the temperature of the Fuser to
decrease. Switch off, then switch on, the
copier. If the problem still exists, perform
the following procedure.
A
WARNING
Dangerous Voltage.
Procedure
Switch off the copier, and disconnect the
Power Cord. Disconnect the blue and white
wires from the Triac (Q1). Set the DMM to
measure 2K ohms, and measure the
resistance across the connections from which
the wires were removed. If the resistance
is
not infinite, replace the triac. Measure the
resistance from each terminal on the triac to
frame ground.
The resistance is infinite.
Y N
A
B
I
Replace the Triac. Reconnect the wires.
Reconnect the wires. Disconnect A23A1P1 on
the Thermal Controller PWB. Connect the
Power Cord and switch on the copier. Set the
DMM to read 5 VDC. Connect the
(
+
)
lead to
A23A1P1-6. Connect the
(-)
lead t o A23A2P1-
5.
5 VDC
is present.
Disconnect A2P2O3 on the LVPSI Driver
PWB (A2). Connect the
(
+
) lead to
A2P203-17. Connect the (-) lead to
A2P203-18.
5 VDC is present.
Y N
I
Replace the LVPSlDriver PWB (A2).
Repair the wires.
~eplace the Thermal Controller PWB (A23A1).
tL.44
Fuser Too Hot RAP