AN MD80 AWAITING TKOF HAD THE R GENERATOR FAIL TO PWR THE #1 XFORMER RECTIFIER. APU PWR SWITCHED TO PWR R BUS. R GENERATOR DEFERRED AS INOP.

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AT THE END OF RWY WAITING FOR ATC DELAY FOR DEPS. STARTED R ENG USING APU. L ENG RUNNING. AFTER NORMAL ENG START; ACFT DID THE PWR XFER FROM THE APU TO THE R ENG. FREQ AND VOLTS FOR EACH ENG GENERATOR WERE NORMAL. THE FLT GUIDANCE PANEL WAS BLANK; THE FO'S FMA WAS BLANK AND THERE WERE F/S SPD FLAG AND F/D FLAG ON THE FO'S PFD. I CYCLED BOTH ENG DRIVEN GENERATORS TO RE-XFER THE BUSSES BACK TO THE APU. AFTER CYCLING; THE ACFT XTIE LOCKOUT LIGHT ILLUMINATED. PULLED OUT THE QRH AND ACCOMPLISHED THE AC XTIE LOCKOUT ON THE GND PROC WITH NO SUCCESS. I THEN CONTACTED DISPATCH AND REQUESTED A PHONE PATCH TO MAINT CTL. THE DISPATCHER AND MAINT CTL HAD A 3-WAY CONVERSATION. THE TECHNICIAN ASKED ME TO CHK SOME CIRCUIT BREAKERS AND THEN ASKED ME TO SWITCH THE DFGC SWITCH FROM #2 TO #1. AT THAT POINT; THE FLT GUIDANCE PANEL WAS NORMAL AND THE TRI NO MODE LIGHT EXTINGUISHED. HE THEN HAD FO BOOTSTRAP HIS PFD OVER TO MY SIDE AND HIS LIGHTS ON THE PFD EXTINGUISHED AS WELL. THE TECHNICIAN THEN SAID THAT EVERYTHING IS NORMAL USING MEL 24-4. THIS WAS NOT CREW PLACARDABLE. DISPATCH CALCULATED THE EXTRA FUEL BURN USING THE APU FOR THE FLT AND CONFIRMED THAT THE WX WAS SUFFICIENT ENRTE; AND WE ALL AGREED THAT THE FLT COULD DEPART. ONCE AIRBORNE AND MORE TIME TO CONTEMPLATE; I READ THE MEL GENERAL SECTION REGARDING DEP FROM THE GATE. I AM NOT SURE THAT THIS APPLIED; BUT I AM NOT POSITIVE. THE QRH STIPULATED THAT MAINT WAS TO BE CONTACTED AND THIS WAS DONE AS WELL A CALL TO DISPATCH.