9-15B5 B
 The MF/HF transceiver fails to produce AF output but the radio is powered on and "TX" is illuminated. What is the most likely cause?
A. The speaker is shorted out.
B. A shorted Push-To-Talk circuit in the microphone.
C. A "crowbar" circuit in the power supply has engaged.
D. The final stage of the AF amplifier circuit has failed. 
