Lexmark X642e Service Manual page 139

FRU
5 First scan sensor—
electrical checks
6 ADF scan motor
7 Scan motor belt
Action
Turn the power off and reconnect CN10 to the motor driver card.
Measure the voltages in the table below with the sensor in normal
operation (sensor closed) and with the sensor open (paper over the
sensor).
First scan sensor
Connector CN10 (motor driver card)
Pin number Sensor closed (uncovered) Sensor open (covered)
CN10—Pin 10
CN10—Pin 11 +5.0 V dc
CN10—Pin 12 +0.03 V dc
Note: All voltages are approximate values.
If the voltages are incorrect, replace the first scan sensor. If the
voltages are correct, go to step 6.
Check the ADF scan motor for proper operation. Turn the power off,
disconnect CN3 on the motor driver card, and measure the voltages
on CN3 on the card.
ADF scan motor
Connector CN3 (motor driver card)
Pin number
CN3—Pin 1 +1.5 V dc
CN3—Pin 2 +1.5 V dc
CN3—Pin 3 +1.5 V dc
CN3—Pin 4 +1.5 V dc
CN3—Pin 5 +1.5 V dc
CN3—Pin 6 +1.5 V dc
Note: All voltages are approximate values.
If the voltages are incorrect, replace the motor driver card. If correct,
turn the power off, reconnect the motor cable to CN3, and measure
the voltages on the scan motor connector (see the table above). If
correct, go to step 7.
Check the scan motor drive belt for any signs of wear or damage or
the belt is off the gear. If the belt is off the gear, reinstall. If the belt is
worn or damaged, replace the belt. If no problem is found, Replace
the complete ADF assembly. See
removal" on page 4-15.
Note: Whenever the complete ADF assembly is replaced, is
necessary to perform the scanner registration. See
registration" on page 4-4.
0 V dc
+5.0 V dc
+5.0 V dc
Static Operating
+24 V dc
+24 V dc
+24 V dc
+24 V dc
+24 V dc
+24 V dc
"ADF complete assembly
"Scanner
Diagnostic information
7002-xxx
0 V dc
2-101