Lexmark Optra ep, Service Manual

Page: 43 / 143

4026-0XX
Diagnostic Information 2-21
3 Input Sensor
Flag Check the flag for damage, especially at the
front edge, Be sure the flag moves freely.
Replace the flag as necessary.
4 Input Sensor Be sure the input sensor is correctly installed
and the sensor/solenoid cable is properly con-
nected.
Disconnect the input sensor cable from the CN3
connector on the engine board. The voltage at
CN3-1 measures b4.5 V dc and +5.5 V
dc. If incorrect, replace the engine board.
If correct, reconnect the input sensor cable at
CN3. Monitor the voltage at CN3-3 while moving
the sensor flag in and out. The voltage changes
from +2 V dc to 0 V dc. If incorrect, check the
input sensor/solenoid cable continuity. If cable
continuity is incorrect, replace the paper feed
frame assembly. If cable continuity is correct,
replace the following FRUs one at a time in the
order shown:
Input Sensor
Engine Board
FRU Action