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DocuColor 12/DCCS50
10-387 External Heat Roll Overheat Thermistor Over-
Reissue
Status Indicator RAPs
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 (PL 8.8).
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/
J17
6 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.
YN
Replace the External Heat Roll Overheat Thermistor (PL 8.
8).
R
econnect the connector. Close the Drawer. Switch on the power. The 10-387 fault is
decl
ared immediately after self-test completes.
YN
Switch off the power. Check the voltage at P/
J10
5-2 on the SSR and GND. Switch on the
power. There is 0 VDC present when self-test completes.
YN
The voltage at P/
J105-2 in
creases to approximately +4.3 VDC within 12 min-
utes.
YN
Replace the IOT Drive PWB (PL 9.
2).
T
he Heater Rod remains illuminated while P/J105-2 sti
ll reads approximately
+4.3 VDC.
YN
This indicates that the problem is intermittent. Replace the External Heat Roll
Overheat
Thermistor (PL 8.8).
Replace the SSR (PL 9.3).
Go to Flag 7 on BSD 10.3 and check the harness for a short circuit to ground. If OK,
replace th
e IOT Drive PWB (PL 9.2).
Go to Flag 5 on BSD 10.3 and check for a short circuit to ground between P/
J176-1 and P/
J413A-12. If OK, replace the External Heat Roll Control Thermistor (PL 8.8). If the problem
continues, replace the IOT Drive PWB (PL 9.2).
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