Lexmark 4076 Execjet II Service Manual - Page 27

4076-0XX FRU OR PROCEDURE 2 Paper Feed Motor 3 Gears ACTION A noisy or chattering motor or a motor that fails to turn, can be caused by: • An open or short in the motor • An open or short in the motor driver on the system board • A bind in the paper feed mechanism Check for 100 ohms (±20 ohms) between the following pins on the motor: Pin 1 to Pin 4 Pin 2 to Pin 4 Pin 3 to Pin 5 Pin 3 to Pin 6 If the readings are incorrect, replace the motor. Check for motor pins shorted to the motor housing. If you find a shorted pin, replace the motor. If the failure remains, replace the system board. Although the paper feeds in a forward direction only, the paper feed motor turns in two directions. If the paper feed motor turns in one direction only, replace the system board. Binds in the paper feed motor or gear train can cause intermittent false paper jam errors. Remove the paper feed motor and check the shaft for binds Also check for loose or worn motor gear Check for binds in the gear train and paper feed mechanism. To do this, rotate the largest gear by hand. If you notice a bind isolate it by removing the small idler gear on the outside of the right side plate. Replace any worn or binding gears, rollers, or bearings. Diagnostic Information 15