What was found
ON CLIMBOUT WE NOTICED THE AIR DATA COMPUTER FAILED ALONG WITH NR1 DC GEN CAUTION LIGHT ILLUMINATED. WE EXCUTED PROCEDURES IN ABNORMAL CHECKLIST, LIGHT EXTINGUISHED. 3 MINUTES LATER, LIGHT CAME BACK ON. WE TURNED OFF THE NR1 DC GEN SWITCH PER ABNORMAL CHECKLIST. WE REQUESTED RETURN TO AIRPORT WITH EMERGENCY EQUIPMENT STAND-BY. WE LANDED SAFELY AND RETURNED TO TERMINAL WITHOUT INCIDENT. FOUND NEGATIVE TERMINAL ON DC GENERATOR, BROKEN. REMOVED AND REPLACED DC GENERATOR IAW MM. AFTER REPLACEMENT OF NR1 STARTER/GENERATOR, OPS TEST OF NR1 ADC GOOD.