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Diagnostic Information 2-127
5016-001
H 231 Paper Jam displays. Paper is jammed in upper or rear unit of
the duplex option.
3 Duplex Rear
Unit Door Open
Sensor(S8)
Duplex Option
Controller Board
Check the voltages on the duplex rear unit door
open sensor on connector CN904.
Pin # Voltage Voltage Voltage
Signal Closed Open
7 DGND 0 V dc 0 V dc
9 BOSN +5 V dc 0 V dc
11 VL +5 V dc +5 V dc
All voltages are approximate values.
• If the voltage on pin 11 is incorrect, replace the
duplex option controller board.
• If the voltage on pin 9 does not change when
the rear unit door is opened and closed, replace
the FRUs in the following order:
1. Duplex rear unit door open sensor
2. Duplex option controller board
FRU Action
1 Upper Duplex
Unit
Rear Duplex
Unit
Check for pieces of paper or other material, in the
upper and rear duplex units, that might cause a
paper jam.
2 Upper Transfer
Roller
Upper Pinch
Rollers
Transfer Drive
Pulley
Rear Unit Gears
Check all the parts associated with paper
movement in the upper and rear duplex units for
correct operation and signs of wear, broken parts
or binds. Repair or replace as necessary.
FRU Action