Rear Thermistor Open - Xerox DocuColor 2240 Service Manual

10-351 Rear Thermistor Open

The machine logic detected an open circuit in the Rear Thermistor.
Initial Actions
Turn off the power, remove the Fuser Assembly and allow it to cool down.
Procedure
Measure the resistance between P600-7 and P600-9 on the Fuser Assembly
resistance is between 30K and 190K Ohms.
Y N
Check the wiring from P600 to P/J212
OK, replace the Sensor Assembly
Reinstall the Fuser Assembly, turn the power ON. Enter
The display is between 678 and 699.
Y N
Turn the power off. Refer to Figure 1
open circuit or poor contact. If the check is OK, replace the MCU PWB
Replace the MCU PWB (PL 13.1).
Figure 1 10-351 RAP Circuit Diagram - Rear Thermistor
Initial issue
DC 3535/2240/1632
(Figure
for an open circuit and poor contact. If the wires are
(PL 7.2).
dC140 [010-101] and press Start.
and check the wiring from P/J404
(PL
10-352 Main Heater Warm Up
The temperature did not reach the READY temperature within the specified time.
Initial Actions
Turn off the power, remove the Fuser Assembly and allow it to cool down.
Procedure
1). The Measure the resistance between P600-4 and P600-6 on the Fuser Assembly
resistance is between 30K and 190K Ohms.
Y N
Check the wiring from
OK, replace the Sensor Assembly
Measure the resistance between P600-1 and P600-12 on the Fuser Assembly
resistance is 20 Ohms or less.
Y N
to J600 for an Replace the Fuser Assembly
13.1).
Reinstall the Fuser Assembly, turn the power ON. Enter
The display is between 678 and 699.
Y N
Turn the power off. Refer to
open circuit or poor contact. If the check is OK, replace the MCU PWB
NOTE: All voltage measurements mentioned below this point must be made while the
Fuser is warming up.
Remove the Rear Cover
Voltage is measured at
Y N
+2 - 3.5VDC is measured at P/J404-5 on the MCU PWB
Y N
Check the wires and connectors. If the check is OK, replace the MCU PWB
13.1).
+24VDC measured at P/J404-9 on the MCU PWB
Y N
Check the wires and connectors. If the check is OK, replace the MCU PWB
13.1).
Check wiring from
replace the AC Drive PWB
Check the wires and connectors. If the check is OK, replace the Fuser Assembly
02/03
2-223
P600 to P/J211 for an open circuit and poor contact. If the wires are
(PL 7.2).
(PL 7.1).
dC140
Figure 1 and check the wiring from
(REP 14.2) and the cover over the 24V LVPS (3 screws). AC Line
FS41 on the AC Drive PWB (PL 9.2).
(PL 13.1).
P/J404 to P/J590 for an open circuit or poor contact. If the check is OK,
(PL 9.2).
(Figure 1). The
(Figure 2). The
[010-100] and press Start.
P/J404 to J600 for an
(PL 13.1).
(PL 13.1).
(PL
(PL
(PL 7.1).
Status Indicator RAPs
10-351, 10-352