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10-390 Fuser Nip Retract Failure RAP
Reissue
Status Indicator RAPs
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 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 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 th
e 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.
YN
Press St
op. Th
ere is +24 VDC from P/J411 pin 6 to P/J411 pin 8.
YN
Refer to Wirenets +24VDC-1 (Fi
gu
re 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.
YN
Go to Fl
ag 1 and Fl
ag 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. Th
e voltage at P/J418B-17 goes to less than +1.0 VDC.
YN
Replace the IOT Drive PWB (PL 9.
2).
+24 V
DC is measured between P/J418B-
19 and GND on the IOT Drive PWB.
YN
Replace the IOT Drive PWB (PL 9.
2).
Go
to Flag 2 on BS
D 10.9 and check the harness for an open circuit. If the harness 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
rem
ai
n latched, answer Yes to the statement.
Enter dC330 010-023 Fuser Nip Clutch (Nip). Pre
ss Start. The Pressure Roll latches
against the Heat Roll.
YN
Press St
op. +24 V
DC is measured between P/J417A-12 on the IOT Drive PWB and
GND.
YN
+24 VDC is measured between P/
J417A-11
on the IOT Drive PWB and GND.
YN
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, replac
e the Fuser Nip Clutch (PL 1.6).
Press Start. Th
e voltage at P/J417A-12 decreases to less than +1.0 VDC.
YN
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.
YN
Press Stop (t
he 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.
YN
T
he status is a constant H.
YN
Go to F
lag 5 on BSD 10.6 and check the harness for a short circuit. If the har-
ness is
good, replace the Nip Sens
or (PL 8.6).
+5 VDC is measured between P/J413A-1 on
the IOT Drive PWB and GND.
YN
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.
YN
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 t
he 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).
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