Lexmark T522 Service Manual - Page 96
Option Control Board
UPC - 734646620642
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4520-xxx FRU 4 High Capacity Feeder Option Control Board Action Check the voltage on J8-1 (green). The voltage measures +24 V dc. If incorrect, check the autoconnect system for any problems. +24 V dc must come from the base printer through the autoconnect system to the high capacity input for the high capacity feeder to be recognized. If the voltage is correct, check the voltages at J11-3(red) and J114(red). The voltages measure +24 V dc. If correct, replace the high capacity feeder option system board. If incorrect, disconnect J8 from the system board and measure the voltages again. If incorrect, check the LVPS cable and the A.C. internal wiring from the input appliance receptacle. If incorrect, replace as necessary. If correct, replace the LVPS. If the voltages are correct, check the stepper motor for shorts from the motor housing to each pin on the motor connector. If you find a short between any pin and the motor housing, replace the motor assembly. If no shorts are found, replace the high capacity feeder option control board. Check the voltage at J9-1 (light blue). The voltage measures approximately +24 V dc. If incorrect, disconnect the cable at J9 and check the voltage again. If the voltage continues to be incorrect, replace the high capacity feeder option system board. If the voltage measures correctly, check the cable. If the cable is damaged, replace as necessary. If no problem is found with the cable, replace the high capacity feeder option control board. 2-68 Service Manual