Lexmark X644E Service Manual - Page 139

FRU 5 First scan sensor- electrical checks 6 ADF scan motor 7 Scan motor belt 7002-xxx 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 0 V dc CN10-Pin 11 +5.0 V dc CN10-Pin 12 +0.03 V dc Note: All voltages are approximate values. 0 V dc +5.0 V dc +5.0 V dc 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 Static +1.5 V dc Operating +24 V dc CN3-Pin 2 +1.5 V dc +24 V dc CN3-Pin 3 CN3-Pin 4 +1.5 V dc +1.5 V dc +24 V dc +24 V dc CN3-Pin 5 +1.5 V dc +24 V dc CN3-Pin 6 +1.5 V dc Note: All voltages are approximate values. +24 V dc 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 "ADF complete assembly removal" on page 4-15. Note: Whenever the complete ADF assembly is replaced, is necessary to perform the scanner registration. See "Scanner registration" on page 4-4. Diagnostic information 2-101