Lexmark X644E Service Manual - Page 152

7002-xxx FRU 2 ADF exit sensor flag 3 ADF exit sensor 4 Motor driver card 5 ADF exit sensor-electrical checks Action Check the exit sensor flag to make sure it operates freely and does not hang or bind. If the flag does not operate correctly and cannot be made to operate correctly, replace the complete ADF assembly. See "ADF complete assembly removal" on page 4-15. Note: Whenever the complete ADF assembly is replaced, it is necessary to perform scanner registration. See "Scanner registration" on page 4-4. If the flag operates correctly, go to step 3. Enter the Diagnostics Menu (turn on MFP while holding 3 and 6), select SCANNER TESTS, and select Sensor Tests. Check the ADF exit sensor for correct operation. Note: You can check the ADF exit sensor by moving the exit sensor flag or by manually feeding a sheet of paper through the ADF. If the sensor fails the test, go to step 4. Turn the power off and disconnect CN9 on the motor driver card. Measure the voltages in the table below: Interval sensor-interrupter type (normally closed) Connector CN9 (motor driver card) CN9-Pin 1 0 V dc CN9-Pin 2 +5 V dc CN9-Pin 3 +5 V dc Note: All voltages are approximate values. If incorrect, replace the motor driver card. If the voltage is correct, go to step 5. Turn the power off and reconnect CN9 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 (sensor flag activated). ADF exit sensor-interrupter type (normally closed) Connector CN9 (motor driver card) Pin number Sensor closed Sensor open CN9-Pin 1 0 V dc 0 V dc CN9-Pin 2 +1.16 V dc +1.16 V dc CN9-Pin 3 +5.0 V dc +0.15 V dc Note: All voltages are approximate values. If the voltages are incorrect, replace the ADF exit sensor. If this does not fix the problem, replace the complete ADF assembly. See "ADF complete assembly removal" on page 4-15. Note: Whenever the complete ADF assembly is replaced, it is necessary to perform scanner registration. See "Scanner registration" on page 4-4. 2-114 Service Manual