10-387 External Heat Roll Overheat Thermistor Overheat Failure Rap - Xerox DocuColor 12/DCCS50 Service Manual

10-387 External Heat Roll Overheat Thermistor Overheat
Failure RAP
The External Heat Roll Overheat Thermistor detected a temperature in excess of 230° C (446°
F) on the External Heat 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 6 to 0.
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 8.1).
– Remove the Front Cover (PL 8.1).
– Remove the Top Cover (PL 8.2).
• Check the External Heat Roll Overheat Thermistor for cleanliness, damage, or 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 Overheat Thermistor
Inspect the surface of the Heat Roll for excessive wear due to the Thermistor. Replace the
External Heat Roll if necessary (PL 8.8).
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 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/J176 on the External Heat Roll Overheat Thermistor. The resis-
tance 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 External Heat Roll Overheat Thermistor
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/J105-2 on the SSR and GND. Switch on the
power. There is 0 VDC present when self-test completes.
Y N
The voltage at P/J105-2 increases to approximately +4.3 VDC within 12 min-
utes.
Y N
Replace the IOT Drive PWB
The Heater Rod remains illuminated while P/J105-2 still reads approximately
+4.3 VDC.
A B
Status Indicator RAPs
10-387 External Heat Roll Overheat Thermistor Over-
(PL
(PL 8.8).
10-387 fault
(PL 9.2).
A B
Y N
This indicates that the problem is intermittent. Replace the External Heat Roll
Overheat Thermistor
Replace the SSR (PL
Go to Flag 7 on BSD 10.3 and check the harness for a short circuit to ground. If OK,
replace the IOT Drive PWB
Go to Flag 5 on BSD 10.3 and check for a short circuit to ground between P/J176-1 and
J413A-12. If OK, replace the External Heat Roll Control Thermistor
continues, replace the IOT Drive PWB
8.8).
is
1/05
2-172
manuals4you.com manuals4you.com
(PL 8.8).
9.3).
(PL 9.2).
(PL
(PL 9.2).
DocuColor 12/DCCS50
P/
8.8). If the problem
Reissue