Lexmark Optra C710 Service Manual - Page 128

5016-001 Main Fan Service Check FRU 1 Main Fan Cable 2 Main Fan Engine Board Cable (CRF) Engine Board Action Be sure the fan cable in-line connector is connected properly to the CRF cable from the engine board. Manually spin the fan and verify it rotates freely. • If incorrect, replace the engine board (CRF) to fan cable. • If the fan turns freely, turn the printer off and check the voltages below from the fan connector to the printer board cable (CRF), as you turn the printer on. Fan cable connector: • Pin 1 (Green) 0 V dc (running and not running) • Pin 2 (Yellow) 0 V dc (fan not running) +5 V dc (fan running) • Pin 3 (Red) 0 V dc (fan not running) +24 V dc (fan running) If any of the voltages are incorrect, disconnect the fan cable from the engine board cable and check the voltages on the engine board cable connector. • If correct, replace the main fan. • If incorrect, check the engine board cable (CRF). • If incorrect, replace the cable. • If correct, replace the engine board. 2-62 Service Manual