B737-700
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 177; Flight Crew Type 8000
Aircraft Equipment Problem Less Severe
Flight Crew FLC complied w / Automation / Advisory; Flight Crew Returned To Departure Airport
Aircraft
Continued takeoff after a master caution light and an electrical indication at approximately 120 knots. Continued to climb via the SID and cleaned up normally. Once established in the climb; we completed the source off QRH and started the APU and brought it online. Once we were complete and checked the overhead again; I noticed the Number 1 drive light was now illuminated. We leveled off and completed the drive light QRH.After completing the non-normal procedures; we assessed our fuel state to continue and decided the safest course of action was to return to [departure airport]. We returned and were met by Maintenance. We pushed off the gate at minimum planned fuel and took off with just above minimum takeoff fuel.
[Report narrative contained no additional information.]
B737-700 flight crew reported returning to departure airport following loss of Number 1 CSD.