Lexmark Optra C710 Service Manual page 194

5016-001
FRU
3 Paper Pass
Sensor
Upper Unit (S2)
I 232 Paper Jam displays. Paper is jammed in the lower rear unit,
or the lower unit of the duplex option.
FRU
1 Rear Duplex
Unit
Lower Duplex
Unit
2 Lower
Transfer Roll
Transfer Drive
Pulley
Transfer
Gears
Timing Belt
2-128
Service Manual
Action
Check the voltages on the duplex upper unit paper
pass sensor on connector CN904.
Pin # Voltage
Signal
19 DGND
21 UPSN
23 VL
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
Action
Check the rear and lower duplex units for pieces of
paper or other material that might cause a paper
jam.
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.
Voltage Voltage
Closed Open
0 V dc 0 V dc
+5 V dc 0 V dc
+5 V dc +5 V dc