CB Radio Galaxy Saturn Repair: Loss of transmit
Loss of transmit. Transmit LED shows transmit switching but radio has no RF output. Bad TR-51 (2SB-754GR).
This is a very common problem in this radio. The 2SB-754 seems to be some what under rated for this circuit. Replace 2SB-754 (7 Amp, 60 Watt) with an NTE-37 (12 Amp, 100 Watt). This should not only return the unit to normal operation but also help to prevent any future problems.
Loss of transmit. Transmit LED does not show transmit switching and radio has no RF output.
Normally this problem is caused by a defective TR38 transmit switch. Using the voltage chart below carefully check to make sure all voltages are correct on transmit and receive as shown. In some units we have found D77 to cause these same symptoms. Always be sure that the regulated 8.7 volts is present at the collector of TR41, and remains constant in both transmit and receive modes.