10-390 Fuser Nip Retract Failure Rap - Xerox DocuColor 12/DCCS50 Service Manual

10-390 Fuser Nip Retract Failure RAP

The Nip Sensor did not go H within 5 seconds after the Fuser Nip Clutch was energized to
retract the Pressure 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
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
blows again, go to the +24 VDC Wirenet 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
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
Y N
Refer to Wirenets +24VDC-1
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
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
Press Start. The voltage at P/J418B-17 goes to less than +1.0 VDC.
Y N
Replace the IOT Drive PWB (PL
+24 VDC is measured between P/J418B-19 and GND on the IOT Drive PWB.
Y N
Replace the IOT Drive PWB (PL
Go to Flag 2 on BSD 10.9 and check the harness for an open circuit. If the harness is
good, replace the Exit Motor (PL
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
against the Heat Roll.
Status Indicator RAPs
10-390 Fuser Nip Retract Failure RAP
P/J169 are seated correctly on the IOT Drive PWB,
(PL 9.3). If the fuse
P/J411 pin 6 to P/J411 pin 8.
(Figure 1) and +24VDC-1 (Figure 5). troubleshoot the
(PL 1.6).
9.2).
9.2).
1.6). If the problem continues, replace the IOT Drive
Pressure 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
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
Press Start. The voltage at P/J417A-12 decreases to less than +1.0 VDC.
Y N
Replace the IOT Drive PWB
Replace the Fuser Nip Clutch
(PL 8.6).
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
ness is good, replace the Nip Sensor
+5 VDC is measured between P/J413A-1 on the IOT Drive PWB and GND.
Y N
Replace the IOT Drive PWB
+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
Go to and Flag 5
ness is good, replace the Nip Sensor
Replace the Nip Clutch
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
Fuser Nip Clutch (PL 1.6).
latches
1/05
2-174
manuals4you.com manuals4you.com
(PL 9.2).
(PL 1.6).
(PL 9.2).
(PL 1.6).
on BSD 10.6 and check the harness for a short circuit. If the har-
(PL 8.6).
(PL 9.2).
(PL 9.3).
on BSD 10.6 and check the harness for an open circuit. If the har-
(PL 8.6).
(PL 1.6).
(PL 8.6). If the problem continues, replace the
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