You have a cold solder connection or dirty contacts in the relay.. key the radio and tap the radio... if the carrier goes away its a solder connection.
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Dbl check your swr in am mode.. Ch your ssb power and mic gain default is 50 on both on hf .. If you use the mh-59 you will need to reduce the mic gain to 35 and it needs to be set for remote mic in the menu. Also the ssb needs to be set 2.5k wide with the ssb carrier zeroed both tx and rx
This is a drive-by guess but I believe I have run across this problem on a forum. There is a diode that is allowing voltage to pass I believe there 2 that cathode to cathode and the double side band is feeding into ssb . Sorry could not be more help.
AM will only give to about 40W without modulation. This is the RF Carrier required for the AM Mode. This is because the RF Carrier is modulated by your voice, and when speaking into the mic, the voice peaks will increase the output to about 80W if not measured with a peak reading wattmeter. All radios will work like this in AM.
SSB requires audio to get any RF output. If your microphone is defective, or your MIC GAIN control is fully counter clockwise, you will get no output power when you speak into the mic. Output power, if not measured with a peak reading wattmeter will bounce to about 80W on voice peaks.
OK bare with me now i have no idea of your knowledge level with CB/ SSB radios.
Lets make sure our setting on radio face is correct before we decide this is an mechanical problem.
Set the following
Volume knob 12 o'clock
Dynamike knob 12 o'clock
Squelch full counter clockwise
Rf gain full clockwise
Select S/RF position on the SWR/CAL switch
Select AM position on the USB/AM/LSB switch
Select CB on the CB/PA switch
Now there will be some critics with opinions on the next instructions. Place a small screwdriver or test lead from a multimeter in center conductor of antenna jack listen for onair noise or radios operators to verify RX is working. Now remove the antenna/screwdrive/testlead. Then key mic just long enough to notice if the meter is swinging do not hold the mic button long this can damage the final. I tell you to do it this way rather that connected to your antenna system so we can eliminate the question if it is you antenna sytem or the radio.
If the LSB or USB was selected when you keyed the mic you would see no meter movement this is due to the lack of a deadkey or carrier for SSB which is a much more efficient method of transmitting on AM.
There are few things that affected the rx and tx together.
How are you testing the audio out?
Are you using another radio?
If so, are you REALLY sure the other radio is ok?
If the other radio is ok, how do you know the mic is ok? have you tested it with another radio?
If the mic is ok, id have a look at the mic socket to check that all the pins are still there. Then open the radio up and check the socket is still connected to the main board.
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