Input Sensor Service Check - Lexmark T520 - 20ppm 8MB Par USB Pcl6 Ps3 Ppds Service Manual

4520-xxx

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.
Service Tip: Run a Diagnostic Print Test in the continuous mode with
the controller board removed. A defective input sensor or circuit
causes the first copy to exit only partially through the fuser assembly.
FRU
1 Input Sensor Flag
2 Engine Board
3 Input Sensor Cable
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
J10-10 on the engine board. If
incorrect, replace the engine 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.
Diagnostic Information
2-61