Lexmark Z31 Color Jetprinter Service Manual - Page 23

4099 FRU Action 2 Paper Feed Motor 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 With the paper feed motor cable disconnected from the system board, check for approximately 10 ohms between the following pins on the motor: Pin 1 to Pin 2 Pin 3 to Pin 4 If the readings are incorrect, replace the motor. 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 a loose or worn motor gear. 3 Gear Plate Assembly Check for binds in the gear train and paper feed mechanism by removing the paper feed motor and rotating the large gear by hand. If you notice a bind, replace the gear plate assembly. 4 Auto Sheet Check the pick roller for wear. Feeder Assembly 5 Mid Frame Assembly Check the following for wear: • Small Feed rollers • Large Feed roller • Exit roller • Star rollers 6 End-of-Forms Flag and Spring Check for binds or damage. Diagnostic Information 2-9