Adf Paper Length Sensor Service Check-Models X644E/X646E - Lexmark X642e Service Manual

7002-xxx
FRU
6 System board
ADF paper length sensor service check—models X644e/X646e
Note: There are two cables between the motor driver card and the paper length sensor. Check to make sure
both cables are installed correctly.
FRU
1 ADF paper length sensor
(in ADF paper tray)
2 ADF paper length sensor
Motor control card
3 ADF paper length sensor
2-122
Service Manual
Action
Replace the original system board with a new and not previously
installed system board. If the problem remains, contact the next level
of support.
Action
Enter the Diagnostics Menu (turn on MFP while holding 3 and 6),
select SCANNER TESTS, and select Sensor Tests. Check the ADF
paper length sensor for correct operation by putting a sheet of paper
in the tray over the sensor. If the sensor does not operate properly, go
to step 2.
Turn the power off, and disconnect the cable to CN8, and measure
the voltages at CN8 on the card. Measure the voltages shown in the
table below:
Paper length sensor—reflective type
(normally closed)
Connector CN8 (motor driver card)
CN8—Pin 4
CN8—Pin 5
CN8—Pin 6
Note: All voltages are approximate values.
If incorrect, replace the motor driver card. If correct, go to step 3.
Turn the power off and reconnect CN8 to the motor driver card.
Measure the voltages in the table below:
Interval sensor—reflective type (normally closed)
Connector CN8 (motor driver card)
Pin number Sensor closed
CN8—Pin 4
CN8—Pin 5 +0.03 V dc
CN8—Pin 6 +5.0 V dc
Note: All voltages are approximate values.
If the voltages are incorrect, replace the paper length sensor. If this
does not fix the problem, replace the ADF paper tray assembly.
If the problem persists, replace the complete ADF assembly. See
"ADF complete assembly removal" on page
Note: Whenever the complete ADF assembly is replaced, it is
necessary to perform scanner registration. See
registration" on page 4-4.
0 V dc
+5 V dc
+5 V dc
Sensor open
0 V dc
+5.0 V dc
+5.0 V dc
4-15.
"Scanner
0 V dc