Lexmark T520 Service Manual page 73

Infoprint 1120 and 1125
POST fails, 230 Paper Jam, Check Duplex message displays.
FRU
1 Duplex D.C. Servo Drive
Motor
2 Input Sensor, Input Sensor
Flag
3 Paper Exit Sensor and Flag
2-46
Service Manual
Action
Check the D.C. servo motor cables
for signs of cuts or other damage.
Check the D.C. servo motor sensor
cable connector for pin damage. If
no problem is found, replace the
FRUs in the following order:
1. D.C. motor assembly
2. Duplex unit system board
Run the Duplex Sensor Test from the
diagnostics menu. If the test fails,
check the input sensor cable at J5
on the system board for correct
installation. If no problem is found,
replace the FRUs in the following
order:
1. Input sensor assembly
2. Duplex unit system board
Check the duplex exit sensor for
correct installation and free
movement of the sensor flag. Check
to make sure the sensor cable is
connected to J8 on the system
board. If no problem is found,
replace the FRUs in the following
order:
1. Exit sensor assembly
2. Duplex unit system board