18. Jam Display Field Service Ver. 1.0 Aug. 2005
228
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Troubleshooting
18.3.5 Misfeed at Switch Back Unit/Duplex Unit transport section
A. Detection Timing
B. Action
Type Description
Detection of misfeed at
Switch Back Unit/Duplex
Unit transport section
The Switch Back Unit Sensor (PC26) is not blocked even after the set
period of time has elapsed after the Paper Exit Sensor (PC4) has been
unblocked by the paper.
The Duplex Unit Upper Transport Sensor (PC24) is not blocked even after
the set period of time has elapsed after the Switch Back Unit Sensor
(PC26) is blocked by the paper.
The Switch Back Unit Sensor (PC26) is not blocked even after the set
period of time has elapsed after the Duplex Unit Upper Transport Sensor
(PC24) is blocked by the paper.
Detection of paper left in
Switch Back Unit/Duplex
Unit transport section
The Switch Back Unit Sensor (PC26) is blocked when the Main Power
Switch is set to ON, a door or cover is opened and closed, or a misfeed or
malfunction is reset.
The Duplex Unit Upper Transport Sensor (PC24) is blocked when the Main
Power Switch is set to ON, a door or cover is opened and closed, or a mis-
feed or malfunction is reset.
Relevant Electrical Parts
Paper Exit Sensor (PC4)
Switch Back Unit Sensor (PC26)
Duplex Unit Upper Transport Sensor (PC24)
Mechanical Control Board (PWB-A)
Step Action
WIRING DIAGRAM
Control Signal
Location
(Electrical
Component)
1 Initial check items - -
2 PC4 I/O check PWB-A PJ18A-11 (ON) M-12
3 PC26 I/O check PWB-A PJ19A-9 (ON) M-5
4 PC24 I/O check PWB-A PJ20A-5 (ON) M-16
5 PC25 I/O check PWB-A PJ20A-8 (ON) M-16
6 Change PWB-A - -
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