Xerox DocuColor 12/DCCS50, Service Manual

Page: 209 / 1617

1/05
2-173 DocuColor 12/DCCS50
10-389 Fuser Nip Contact Failure RAP
Status Indicator RAPs
Reissue
10-389 Fuser Nip Contact Failure RAP
The Nip Sensor did not go L within 5 seconds after the Fuser Nip Clutch was energized (Pres-
sure Roll started moving against the Heat Roll).
Initial Actions
Refer to BSD 10.6, BSD 10.9, and 10.12 for the following procedure.
Check for the following:
•
Ensure that connectors P/J413A and P/J169 are seated correctly on the IOT Drive PWB,
and the Nip Sensor and there are no obvious crimped or broken wires.
• Check Fuse F1 on the AC Driver PWB. If the fuse is blown, replace it ( PL 9.3 ). If the fuse
blows again, go to the +24 VDC Wirenets ( Figure 1 ) and check for a short circuit in the
harness.
• Open the Drawer and extend it to the Service Position. Rotate the Gear on the latching
mechanism in the CCW direction (as viewed from the front of the machine) and ensure it
rotates freely and the Pressure Roll moves up and down as the Gear is rotated (
PL 8.6 ).
Leave the Pressure Roll unlatched.
Procedure
Enter dC330 010-033 Oil Pump. Press Start . The Exit Motor energizes.
Y N
Press Stop . There is +24 VDC from P/J411 pin 6 to P/J411 pin 8.
Y N
Refer to Wirenets +24VDC-1 ( Figure 1 ) and +24VDC-1 ( Figure 5 ). troubleshoot the
24V input power from the IOT LVPS to the Exit Motor.
Approximately +7 VDC is measured between P/J418B -17 on the IOT Drive PWB and
GND.
Y
N
+24 VDC is measured between
P/J418B
-19 on the IOT Drive PWB and GND.
Y N
Replace the IOT Drive PWB ( PL 9.2 ).
Go to Flag 1 and Flag 3 on BSD 10.9 and check the harness for an open circuit. If
the harness is good, replace the Exit Motor ( PL 1.6 ).
Press Start . The voltage at P/J418B -17 goes to less than +1.0 VDC.
Y N
Replace the IOT Drive PWB ( PL 9.2 ).
+24 VDC is measured between P/J418B -19 on the IOT Drive PWB and GND.
Y N
Replace the IOT Drive PWB ( PL 9.2 ).
Go to Flag 2 and Flag 3 on BSD 10.9 and check the harness for an open circuit. If the har-
ness is good, replace the Exit Motor ( PL 1.6 ). If the problem continues, replace the IOT
Drive PWB ( PL 9.2 ).
NOTE: In the following step, if the Pressure Roll latches against the Heat Roll but does not
remain latched, answer Yes to the statement.
Enter dC330 010-023 Fuser Nip Clutch (Nip) . Press Start . The Pressure Roll latches
against the Heat Roll.
Y
N
Press Stop . +24 VDC is measured between P/J417A -12 on the IOT Drive PWB and
GND.
Y
N
+24 VDC is measured between
P/J417A -11 on the IOT Drive PWB and GND.
Y N
Replace the IOT Drive PWB ( PL 9.2 ).
Go to Flag 6 on BSD 10.6 and check the harness for an open circuit. If the harness is
good, replace the Fuser Nip Clutch ( PL 1.6 ).
Press Start . The voltage at P/J417A -12 decreases to less than +1.0 VDC.
Y N
Replace the IOT Drive PWB ( PL 9.2 ).
Replace the Fuser Nip Clutch ( PL 1.6 ).
The Pressure Roll remains latched against the Heat Roll.
Y
N
Press Stop (the Exit Motor should still be running). Enter dC330 010-220 Nip Sensor .
Press Start . Enter dC330 010-023 Fuser Nip Clutch (Nip) . Press Start. As the Pres-
sure Roll latches and unlatches, the status of the Nip Sensor changes from L to H
to L.
Y
N
The status is a constant H.
Y
N
Go to Flag 5 on BSD 10.6 and check the harness for a short circuit. If the har-
ness is good, replace the Nip Sensor ( PL 8.6 ).
+5 VDC is measured between P/J413A -1 on the IOT Drive PWB and GND.
Y N
Replace the IOT Drive PWB ( PL 9.2 ).
+5 VDC is measured between P/J413A -1 on the IOT Drive PWB and P/J44 -7 on
the Distribution PWB.
Y
N
Replace the Distribution PWB ( PL 9.3
).
Go to and Flag 5 on BSD 10.6 and check the harness for an open circuit. If the har-
ness is good, replace the Nip Sensor ( PL 8.6 ).
Replace the Nip Clutch ( PL 1.6 ).
Check for obvious damage and/or broken Exit Motor and Fuser Nip Clutch gear assemblies
that would cause the Pressure Roll latching mechanism to be slow to actuate the Nip Sensor. If
the problem continues, replace the Nip Sensor (
PL 8.6 ). If the problem continues, replace the
Fuser Nip Clutch ( PL 1.6 ).
A
A