A B737-200 FLC DIVERTED AS A RESULT OF ELECTRICAL FUMES IN THE COCKPIT AND CABIN. THE FLT ATTENDANT CONFIRMED THAT FUMES WERE ALSO IN THE CABIN. CHKLIST WAS COMPLETED; BUT FUMES REMAINED. FLT DIVERTED. EMER.

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AT CRUISE OVER CHS WE SMELLED FUMES THAT APPEARED TO BE ELECTRICAL IN ORIGIN. FLT ATTENDANT CONFIRMED THAT THE FUMES WERE ALSO IN THE CABIN. CHKLIST WAS COMPLETED BUT FUMES WERE STILL PRESENT. FLT WAS DIVERTED TO CHS WITH NO FURTHER PROBS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR WAS ASKED IF THE GASPER FAN WAS TURNED OFF. RPTR STATES THAT HE DID TURN THE GASPER FAN OFF; AS IT WAS SUSPECT; EVEN THOUGH THIS WAS NOT PART OF THE CHKLIST PROCS. DURING NORMAL FLT OPS; FLC TECHNIQUE IS TO TURN THE FAN OFF AT ALT (BECAUSE OF ASSOCIATED PROBS WITH THE WINDINGS ON THE MOTOR); BUT THE FLC HAD OPTED TO LEAVE IT ON DURING THIS FLT. DURING THE FLT'S DIVERSION; THE FLC SUSPECTED THAT THEY HAD ISOLATED THE SOURCE; BUT THE FUMES WERE STILL LINGERING. ALSO; THE FLT ATTENDANTS AND THE PAX COULD STILL SMELL FUMES. FLC DECISION WAS; WITHOUT QUESTION; TO LAND. AN IMMEDIATE LNDG SERVED 2 PURPOSES: IT SATIATED THE ALARM THAT EVERYONE ON BOARD MUST HAVE FELT; AND IT WAS PRECAUTIONARY; AS THERE WAS STILL A POSSIBILITY THAT THE PROB HAD NOT BEEN RESOLVED. RPTR STATES THAT TURNING OFF THE GASPER FAN IS NOT A TRAINED OR PUBLISHED PROC. FLC RESPONSE WAS A RESULT OF THEIR PERSONAL EXPERIENCE. CHKLIST EMPHASIS IS NOW ON MAKING AN IMMEDIATE LNDG. SUPPLEMENTAL INFO FROM ACN 326483: PAX AND CREW EXITED ACFT AT TERMINAL GATE. PROB FUME SOURCE LATER DETERMINED BY MAINT TO BE GASPER FAN.