Xerox DocuColor 2240 Service Manual page 257

10-348 Main Heater Over Heat
The Front Thermistor detected an overheat condition.
Initial Actions
Turn off the power, remove the Fuser Assembly, and allow it to cool down.
Procedure
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 P600-4 and P600-6 on the Fuser Assembly
The resistance is between 30K and 190K Ohms.
Y N
Check the wiring from P600 to P/J211
OK, replace the Sensor Assembly (PL
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
A
Status Indicator RAPs
10-348
(Figure
for an open circuit and poor contact. If the wires are
7.2).
dC140 [010-100] and press Start.
and check the wiring from P/J404 to J600
(PL 13.1).
Figure 2 10-348 RAP Circuit Diagram - Main Heater and Sub Heater CD
A
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/J404-5 on the MCU PWB
Y N
Replace the MCU PWB (PL
Check the wires and connectors
PWB (PL 9.2).
1).
for an
Figure 1 10-348 RAP Circuit Diagram - Front Thermistor
09/03
2-224
(Figure 2).
13.1).
(Figure 1, Figure 2). If the check is OK, replace the AC Drive
DC 3535/2240/1632, WC M24
Initial issue