A B727-200 IN CRUISE AT FL330 DECLARED AN EMER AND DIVERTED DUE TO SMOKE AND SMELL IN THE PAX CABIN CAUSED BY A FAILED R PACK AUTO TEMP CTLR.

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AT APPROX 1 HR INTO THE FLT; THE CSC CAME INTO THE COCKPIT AND INFORMED ME THAT THERE WAS SMOKE IN THE CABIN AND IT HAD AN ELECTRICAL SMELL. WHILE THE CSC WAS LOOKING FOR THE SOURCE OF SMOKE IN AFT CABIN; I HAD THE SO CONTACT DISPATCHER AND NOTIFY OF PROB. FO INFORMED ATC. INFORMED BOTH DISPATCHER AND ATC OF POSSIBLE DIVERSION. CSC INFORMED ME 'SMOKE STILL PRESENT;' UNABLE TO LOCATE SOURCE; AND R AFT LAVATORY SMOKE ALARM SOUNDING OFF. HAD SO STEP INTO CABIN; VERIFIED SMOKE AND SMELL. INITIATED EMER DSCNT TO AMA AS SO RE-ENTERED COCKPIT. AT THIS TIME 'R DUCT OVERHEAT' LIGHT ILLUMINATED. RAN THE EMER DSCNT; SMOKE IDENT AND REMOVAL; AND DUCT OVERHEAT LIGHT CHKLISTS. WAS MY LEG; GAVE THE ACFT TO FO AT THE BEGINNING OF SIT. HE FLEW THE DSCNT; APCH; AND LNDG WHILE I WORKED WITH SO AND CSC. REQUESTED EMER EQUIP FOR LNDG. DURING DSCNT THE CABIN SMOKE CLRED. LNDG WAS NORMAL. WX AT AMA 150 DEGS AT 7 KTS; 10 MI 4 OVCST 3 DEGS/3 DEGS; HVT WT LNDG APPROX 156000 LBS. AFTER LNDG WITH NO EVIDENCE OF SMOKE; TAXIED TO RAMP AREA WHERE WE WERE ASSISTED BY ACR PERSONNEL. AFTER STOPPING THE ACFT; FIRE FIGHTERS GAVE THE ACFT A 'LOOK OVER' FOR EVIDENCE OF FIRE OR SMOKE -- NONE SEEN. OFF-LOADED THE PAX FROM L1 AND HAD THEM ENTER THE TERMINAL BUILDING. A FIRE FIGHTER ENTERED THE ACFT TO INVESTIGATE. NEITHER THE FIRE FIGHTERS NOR CONTRACT MAINT COULD FIND EVIDENCE OF SMOKE OR FIRE. AFTER DISCUSSIONS WITH ATL MAINT; FIRE FIGHTERS; AND CONTRACT MAINT; FELT SURE THAT THE SOURCE OF SMOKE WAS THE R PACK. REGENERATED THE FLT AND BROUGHT THE ACFT INTO ATL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE R PACK OVERHEAT WAS CAUSED BY AN AUTO TEMP PACK CTLR WHICH WAS DEFERRED AND THE PACK WAS OPERATED TO TRIP TERMINATION IN MANUAL MODE.