Lexmark Forms Printer 2400 Service Manual - Page 34

24xx Carrier Service Check Note: The Carrier Service Check includes the carrier drive, home position sensor and ribbon feed. FRU 1 Carrier 2 Home Position Sensor Action Verify the carrier motor connector is connected to the logic board at CN2. If the carrier motor connector is connected properly, check the carrier belt and the ribbon cartridge for wear or damage. Check the belt and pulley engagement. Manually move the carrier the full length of the carriage to check for binds and to be sure the ribbon advances when the carriage moves in either direction. If the carrier binds check the following: • Correct printhead-to-platen gap. Go to "Printhead-to-Platen Gap Adjustment" on page 4-2. • Clean and lubricated carrier shaft. • Idler pulley not binding. • Ribbon drive rack gear teeth not damaged. If the carrier still binds: Remove the belt and move the carrier again. • If the bind is gone, replace the carrier motor. If the bind remains, replace the carrier. After replacing the logic board or any parts affecting the carrier, perform the bidirectional print adjustment. See "Bidirectional Print Adjustment" on page 4-4. If the carrier moves manually without binding, but the home position error still occurs, verify that the logic board is receiving +40 V dc on pin CN12-1. Check that the 5 V dc home position sensor signal is reaching the logic board. Replace the sensor, or the short flexible cable as necessary. 2-16 Service Manual