Universal Garage Remote (610-2107) Troubleshooting Faxback Doc. # 31190 The red LED does not blink every 5 seconds, or if the receiver does not respond to the transmitter and the red light blinks: Teach the transmitter, see " Faxback Doc. # 31191, Operation. Use a separate 12-volt DC wall adapter (Radio Shack Cat. No. 273-1652, not supplied) and change the switch to the AC Adapter position, closest to the receiver's 12VDC 50 MA jack. (CS 3/6/96)