Xerox DocuColor 2240 Service Manual page 258

10-349 Front Thermistor Open
The machine logic detected an open circuit in the Front Thermistor.
Initial Actions
Turn off the power, remove the Fuser Assembly, and allow it to cool down.
Procedure
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 P600 to P/J211
OK, replace the Sensor Assembly
Reinstall the Fuser Assembly, turn the power ON. Enter
The display value 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 10-349 RAP Circuit Diagram - Front Thermistor
Initial issue
DC 3535/2240/1632, WC M24
(Figure
for an open circuit and poor contact. If the wires are
(PL 7.2).
dC140 [010-100] and press Start.
and check the wiring from P/J404
(PL
10-350 Sub Heater Over Heat
The Rear Thermistor detected an over heat condition.
Initial Actions
Turn off the power, remove the Fuser Assembly and allow it to cool down.
Procedure
1). The
NOTE: If this fault is declared 3 times in succession, print and copy mode will be disabled. In
order to clear this condition, reset NVM location 744-003 to 0.
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
OK, replace the Sensor Assembly
to J600 for an Reinstall the Fuser Assembly, turn the power ON. Enter
13.1). The display value 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: The voltage measurement mentioned in the next step must be made while the
Fuser is warming up.
+2 - 3.5VDC is measured at P/J404-7 on the MCU PWB
Y N
Replace the MCU PWB
Check the wires and connectors. If the check is OK, replace the AC Drive PWB
Figure 1 10-350 RAP Circuit Diagram - Rear Thermistor
09/03
2-225
P600 to P/J212 for an open circuit and poor contact. If the wires are
(PL 7.2).
dC140 [010-101] and press Start.
Figure 1 and check the wiring from
(Figure
(PL 13.1).
(Figure 1). The
P/J404 to J600 for an
(PL 13.1).
2).
(PL 9.2).
Status Indicator RAPs
10-349, 10-350