Lexmark Optra S Service Manual - Page 75
Fuser Service Check, Service Tip: Set the Fuser Temperature to NORMAL before starting
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4059-XXX FRU 3 Error Code 927 (Fan runs) 4 Error Code 927 (Fan not running) Action 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 as follows: +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. Fuser Service Check Cold Fuser Service Check Error codes 920, 921, and 922 may display for a cold fuser failure. A 920 error caused by low line voltage can sometimes be cleared by turning the machine off and then on again. A 925 service error indicates the wrong fuser lamp is installed in the printer and does not match the one stored in the printer code. Service Tip: Set the Fuser Temperature to NORMAL before starting this service check. FRU 1 Fuser Lamp (Incorrect Lamp/925 Service Error) Action Install the correct voltage and wattage lamp or fuser assembly. Diagnostic Information 2-48