10-375 Pressure Roll Control Thermistor Overheat Failure Rap - Xerox DocuColor 12/DCCS50 Service Manual

10-375 Pressure Roll Control Thermistor Overheat Failure
RAP
The Pressure Roll Control Thermistor detected a temperature in excess of 230° C (446° F) on
the Pressure Roll.
NOTE: This status code is stored in NVM location 777-160 and cannot be reset by Power Off/
Power On. To reset this code, enter Diagnostics and change the value in NVM location 777-
160 Fuser Over heating Failure from 3 to 0.
Initial Actions
Refer to BSD 10.2 and 10.12 for the following procedure.
• Open the Drawer and extend it to the service position. Perform the following:
– Remove the Oil Cartridge (PL 8.1).
– Remove the Front Cover (PL 8.1).
– Remove the Top Cover (PL 8.2).
• Check the Pressure Roll Control Thermistor for cleanliness, damage and excessive wear
at the point where the Thermistor contacts the Pressure Roll. If the surface of the Ther-
mistor is worn, replace the Pressure Roll Control Thermistor
of the Pressure Roll for excessive wear due to the Thermistor. Replace the Pressure Roll
if necessary (PL 8.3).
Procedure
NOTE: Prior to replacing a component, disconnect the connectors to the component (Pressure
Roll Control Thermistor and IOT Drive PWB). Check the connectors for broken, bent and dirty
pins. disconnect and reconnect the connectors several times to remove contaminants due to
oxidation.
Ensure NVM location 777-160 is reset to 0. Switch off the power. Cheat the Front Door Inter-
lock Switch. Disconnect P/J173 on the Pressure Roll Control Thermistor. The resistance of the
Thermistor should be in the range of 0.78K Ohms when hot, to 150K Ohms when cool (room
temperature). The resistance is in specification.
Y N
Replace the Pressure Roll Control Thermistor
NOTE: To remove the harness guard
on the guard that is located below the front cam
Reconnect the connector. Close the Drawer. Switch on the power. The
declared immediately after self-test completes.
Y N
Switch off the power. Check the voltage at P/J105-3 on the SSR and GND. Switch on the
power. There is 0 VDC present when self-test completes.
Y N
The voltage at P/J105-3 increases to approximately +4.3 VDC within 12 min-
utes.
Y N
Replace the IOT Drive PWB
A B C
Reissue
DocuColor 12/DCCS50
(PL 8.6). Inspect the surface
(PL 8.6).
(PL 8.6) around the thermistor wires, press the tab
(PL 8.6).
10-375 fault
(PL 9.2).
A B C
The Heater Rod remains illuminated while P/J105-3 still reads approximately
+4.3 VDC.
Y N
This indicates that the problem is intermittent. Replace the Pressure Roll Con-
trol Thermistor (PL
Replace the SSR (PL 9.3).
Go to Flag 7 (Flag 17 w/ Tag P31) on BSD 10.2 and check the harness for a short circuit
to ground. If OK, replace the IOT Drive PWB
Go to Flag 5 on BSD 10.2 and check for a short circuit to ground between P/J173-1 and
J413A-9. If OK, replace the Pressure Roll Control Thermistor
ues, replace the IOT Drive PWB (PL
is
1/05
10-375 Pressure Roll Control Thermistor Overheat
2-165
8.6).
(PL 9.2).
(PL 8.6). If the problem contin-
9.2).
Status Indicator RAPs
P/