10-377 External Heat Roll Control Thermistor Failure Rap; 10-378 External Heat Roll Overheat Thermistor Failure Rap - Xerox DocuColor 12/DCCS50 Service Manual

10-377 External Heat Roll Control Thermistor Failure RAP

The External Heat Roll Control Thermistor detected an abnormal resistance value continuously
for 1500 msec (External Heat Roll Control Thermistor disconnected).
Initial Actions
Refer to BSD 10.3 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
– Remove the Front Cover (PL
– Remove the Top Cover (PL 8.2).
• Check the External Heat Roll Control Thermistor for cleanliness, damage and excessive
wear at the point where the Thermistor contacts the External Heat Roll. If the surface of
the Thermistor is worn, replace the External Heat Roll Control Thermistor
Inspect the surface of the External Heat Roll for excessive wear due to the Thermistor.
Replace the External Heat Roll if necessary
Procedure
NOTE: Prior to replacing a component, disconnect the connectors to the component (External
Heat 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.
Switch the power off. Disconnect P/J175
sure the resistance between P/J175-1 and P/J175-2 on the External Heat Roll Control Ther-
mistor. The resistance of the Thermistor should be in the range of 0.78K Ohms when hot, to
150K Ohms when cool (room temperature). Note the measurement if it is in specification.
The resistance of the Thermistor is in specification.
Y N
Replace the External Heat Roll Control Thermistor
Reconnect P/J175 to the External Heat Roll Control Thermistor. Close the Drawer. Disconnect
P/J413A from the IOT Drive PWB. Measure the resistance from P/J413A-13 to P/J413A-11.
The resistance measurement is the same as the measurement noted above (+/- 5%).
Y N
Go to Flag 6 on BSD 10.3. Check the harness for an open circuit.
Replace the IOT Drive PWB (PL 9.2).
Reissue
DocuColor 12/DCCS50
8.1).
8.1).
(PL 8.8).
on the External Heat Roll Control Thermistor. Mea-
(PL 8.8).
10-378 External Heat Roll Overheat Thermistor Failure
RAP
The External Heat Roll Overheat Thermistor detected an abnormal resistance value continu-
ously for 1500 msec (External Heat Roll Overheat Thermistor disconnected).
Initial Actions
Refer to BSD 10.3 and 10.12 for the following procedure.
• Open the Drawer and extend it to the service position. Perform the following:
– Remove the Oil Cartridge
– Remove the Front Cover
– Remove the Top Cover
• Check the External Heat Roll Overheat Thermistor for cleanliness, damage and exces-
(PL 8.8).
sive wear at the point where the Thermistor contacts the External Heat Roll. If the surface
of the Thermistor is worn, replace the External Heat Roll Overheat Thermistor
Inspect the surface of the External Heat Roll for excessive wear due to the Thermistor.
Replace the External Heat Roll if necessary
• Check the Drawer connector
Procedure
NOTE: Prior to replacing a component, disconnect the connectors to the component (External
Heat Roll Overheat Thermistor and IOT Drive PWB). Check the connectors for broken, bent
and dirty pins. Disconnect and reconnect the connectors several times to remove contami-
nants due to oxidation.
Switch the power off. Disconnect
sure the resistance between P/J176-1 and P/J176-2 on the External Heat Roll Overheat Ther-
mistor. The resistance of the Thermistor should be in the range of 0.78K Ohms when hot to
150K Ohms when cool (room temperature). Note the measurement if it is in specification.
The resistance of the Thermistor is in specification.
Y N
Replace the External Heat Roll Overheat Thermistor
Reconnect P/J176 to the External Heat Roll Overheat Thermistor. Close the Drawer. Discon-
nect P/J413A from the IOT Drive PWB. Measure the resistance from P/J413A-13 to P/J413A-
12. The resistance measurement is the same as the measurement noted above (+/- 5%).
Y N
Go to Flag 5 on BSD 10.3. Check the harness for an open circuit.
Replace the IOT Drive PWB
1/05
10-377 External Heat Roll Control Thermistor Fail-
2-167
(PL 8.1).
(PL 8.1).
(PL 8.2).
(PL 8.8).
at the rear of the Fuser for damaged pins.
P700B
P/J176 on the External Heat Roll Overheat Thermistor. Mea-
(PL 8.8).
(PL 9.2).
(PL 8.8).
Status Indicator RAPs