Input Sensor Service Check - Lexmark X642e Service Manual

7002-xxx
Tray x Paper Low
adequate paper in the tray
FRU
1 Paper low switch
Paper low switch cable
High-capacity feeder option
control board
Excessive noise or vibration
FRU
1 DC motor assembly
2 Idler pulley
DC motor assembly
3 Drive pulley
4 Motor drive belt
tray drive belt

Input sensor service check

Service tip: Run the Base Sensor Test. Check the input sensor for proper operation. The display changes from
open to closed as the sensor flag is manually moved in and out of the sensor.
FRU
1 Input sensor flag
2 System board
3 Input sensor cable
2-146
Service Manual
displays when the high-capacity feeder input tray is full or has
Action
Run the sensor diagnostics for tray x (x=the number that represents
the high-capacity input tray).
If the test fails, check the voltage at J3-1 (gray). The voltage
measures approximately +24 V dc. If incorrect, disconnect the paper
low switch cable from J3 and measure the voltage again on J3-1. If
incorrect, replace the high-capacity feeder option control board. If
correct, check the cable for a short between pins 1 and 2 on the
cable. If incorrect, replace the cable. If correct, check the switch for a
bent or deformed actuator lever or defective switch. If incorrect,
replace the switch.
Action
Make sure all the motor plate mounting screws are tight.
Make sure the idler pulley is not binding on the pulley shaft. Check
the pulley for wear. Check the idler pulley shaft on the motor
mounting plate for damage or contamination.
Check the drive pulley for wear, binds or damage to the pulley or
pulley shaft. Make sure the pulley turns freely on the pulley shaft.
Check the DC motor drive belt for damage. Make sure the belt is
tracking correctly on the drive pulley, idler pulley, and motor pulley.
Check the tray drive belt for damage. Make sure the belt is tracking
correctly on the lower section of the drive pulley and lead screw
pulleys.
Action
Check the input sensor flag for damage and proper operation. If a
problem is found, repair as necessary.
Check for approximately +5 V dc at J15-10 on the system board. If
incorrect, replace the system board.
Check the continuity of the input sensor cable section of the front
wiring harness. If incorrect, replace the harness. If correct, replace
the input sensor assembly.