Lexmark J110 Service Manual - Page 77

4085-001 Maintenance Station Service Checks FRU Action 1 Maintenance Station Assembly 2 Maintenance Motor Assembly 3 Peristalic Pump 4 Maintenance Homing Sensor 5 Wiper 6 Cap The maintenance carrier is driven in a front to rear motion by the maintenance stepper motor. A homing sensor is provided at the rear of the maintenance station to home the maintenance carrier during power up. Engine code software controls the step count from the home position to the various positions the maintenance carrier must move to accomplish the various maintenance tasks on the printheads. Utilizing cams and linkages, the various components on the maintenance carrier are actuated by the carrier motion. Check the maintenance carrier moves through its complete forward to back motion without binds. Check the maintenance station for worn, broken or dislodged parts. Check that the maintenance sensor is snapped securely into the maintenance station frame. Check for approximately +1.8 V dc at pins 1, 2, 3, and 4 on connector (J3) on the engine board. If voltage is incorrect, replace the engine board. If voltage is correct, check connector and voltage at the motor. Check for a short in motor and for binds. If a short or bind is found, replace the motor. Check the hose connections. If okay, replace the pump. See "Peristaltic Pump Removal" on page 4-49 . If the access door switch does not work or carrier does not move, check (J3) connector pin number 7 for approximately +5 V. If voltage is correct, check connection at the sensor. If connection is good, replace sensor. See "Maintenance Sled Test" on page 3-33 . A worn wiper can cause degraded print quality just after a maintenance cleaning. Check for a loose or worn wiper. A worn cap can cause the printhead nozzles to dry and clog. Check for a loose or worn cap. Diagnostic Information 2-55