Lexmark T522 Service Manual - Page 83

4520-xxx 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 3 Error Code 927 (Fan runs) 4 Error Code 927 (Fan not running) 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. Check the voltage at J1-1 on the engine board. The voltage measures +5 V dc (static) 0 V dc (fan running). If incorrect, replace the main fan. If this does not fix the problem, replace the engine board. Check the voltage at J1-3 on the engine board. The voltages are: +22 V dc to +24 V dc (printer and fan running) +12 V dc to +15 V dc (printer not running - fan running about half speed). If incorrect, replace the engine board. If this does not fix the problem, replace the main fan. Diagnostic Information 2-55