Lexmark Optra T Service Manual - Page 74
Fan Service Check, Fan does not run or is noisy.
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4069-XXX Fan Service Check Auxiliary Fan Service Check The auxiliary fan is in models 414 and 616. Fan does not run or is noisy. FRU 1 Fan Assembly 2 Engine Board Action Check the fan for proper installation and for excessive noise. If incorrect, replace the fan and cable assembly. Check to make sure the auxiliary fan cable is seated on connector J7 on the engine board. If correct, check for +24 V dc on J7-1 on the engine board. If incorrect, replace the engine board. If correct, replace the fan assembly. Note: When the printer is in warmup the voltage at J7-1 measures approximately +12 V dc. When the printer is running, the voltage measures approximately +24 V dc. Main Fan Service Check Check the cable connections at J1 on the engine board and at the main fan assembly. The main fan runs continuously when the printer is powered on unless the printer is in the Power Saver mode. FRU 1 Main Fan 2 Main Fan to Engine Board Cable Action Manually spin the fan and check that it rotates freely. Check the cable connection to the engine board, J1 for correct installation. Check the continuity of the cable. If incorrect, replace the cable. 2-46 Service Manual