I don't know this radio but heres the common thing that happens:
Sounds to me like the 8 volt regulator
What is the swr? This can impact the receiver. However, the tuning coils for receive and transmit are close to each other and someone most likely turned the receive coil instead of the transmit coil. The coils that are adjustable that affect receive are 13, 15 and 3. 3 is the coil that is close to the transmit section. You may want to have it realigned.
SOURCE: cobra 142 base
I don't know this radio individually, but heres the common thing that happens:
Sounds to me like the 8 volt regulator chip has blown after overvoltage. I expect the power supply has gone too, putting 18+ volts into the radio.
Repair the power supply. (Check its 13-13.8 Volts).
Then check the regulator (7808) is putting out anything, should be middle pin ground then 13V one side and 8V the other, if nothing, its blown. Replace it if gone.
Hopefully thats all thats gone and it should work again.
SOURCE: B- kit
I think it would be better to buy an expo kit already built for your radio. There is other components on the board with the crystals and their values are very critical for tuning it exactly on frequency. Good luck with it,, Mechanic
SOURCE: Cobra 142 GTL no dead key
Are you sure that you're on the AM mode? It sounds more like you're on LSB or USB. If you are on AM, the problem may be the power control (VR6) inside the radio.
SOURCE: cobra 142 gtl no audio on receive
Hi and welcome to FixYa,
Initially, the speaker of course has been checked?
Offhand, would partial schematic of the mic and speaker section help?
Good luck and thank you for asking FixYa.
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