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2-128 Service Manual
5016-001
I 232 Paper Jam displays. Paper is jammed in the lower rear unit,
or the lower unit of the duplex option.
3 Paper Pass
Sensor
Upper Unit (S2)
Check the voltages on the duplex upper unit paper
pass sensor on connector CN904.
Pin # Voltage Voltage Voltage
Signal Closed Open
19 DGND 0 V dc 0 V dc
21 UPSN +5 V dc 0 V dc
23 VL +5 V dc +5 V dc
All voltages are approximate values.
• If the voltage on pin 23 is incorrect, replace the
duplex option controller board.
• If the voltage on pin 21 does not change when
the sensor is opened and closed, replace the
FRUs in the following order:
1. Duplex upper unit paper pass sensor
2. Duplex option controller board
FRU Action
1Rear Duplex
Unit
Lower Duplex
Unit
Check the rear and lower duplex units for pieces of
paper or other material that might cause a paper
jam.
2
Lower
Transfer Roll
Transfer Drive
Pulley
Transfer
Gears
Timing Belt
Check all parts associated with paper movement
in the rear duplex unit for correct operation and
signs of wear, broken parts or binds. Repair or
replace as necessary.
FRU Action