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I've seen people fry the final transistor stage in their radios when they've "tuned" the connex board. I'm betting that's what happened here. Have a tech check that our for you if you don't know how to find/test the finals. Good luck
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You should check the new cable wiring connections. There is a resistor in that microphone that connects to the channel button circuit, it is (electrically) between switch 5 (up) and pin 3. If this not present then it may be causing your issue, IT is also possible that the diode for that circuit (located on the main board) got damaged when the cord was cut. diagram: http://www.cbtricks.com/radios/realistic/trc_476/476_print.htm
I would say a bad or cold solder joint on board somewhere. Bad quality control. Might flex radio chassis slightly while keying? A tooth pick and hours of probing around switching area on board and the pa section till problem found.
Take off the cover, you will need a watt meter or mod meter to do this. On the circuit board, part side up, look for D11, and cut one end of it, hook up meter, key the mike and with a peaking or tuning tool, while saying aaahhhhhhh in a long and steady voice, tune L12,L13,L14 for highest peak, you can get the tool there also..put cover back on and enjoy.....hope this helps...
Take off the cover, and hook it back up to antenna, and power, set it on AM mode, mike gain at minimum, RF power to HI, connect watt-meter to ant. out-put, adjust VR13, key the mike adjust it for 8-10 watts, do not go any higher than that because you will damage the transistors...Then replace cover and enjoy....hope this helps.....
Take the cover off,you will need a vom-ohm meter,check the final and regulator,if the led light is working, then its not the keying transistor,check D77,under the mike plug, original #MA27T, the sub is NTE-605A varistor. Also check the mike plug,see if pa works. ..hope this helps..
Something in your antenna setup is causing high SWR reflected back into the radio. Antenna could be ungrounded? Have you tuned that antenna? Any part of the coax broken or pinched in a door? Where is he antenna located on the vehicle? Are you parked under or near a metal building? All of these things can cause high SWR reflect. Let me know if you need help in tuning your antenna or getting it set up.
Hello Adam, first off, do not unhook the antenna then key the mic; you run the risk of blowing the final transistor out of the radio, then it will not TX.
The digital TX lights can be adjusted high or low by a cb tech. All they are is a general reference as to how much power is being dead keyed; usually around 4 watts.
For the best performance, the antenna needs to have the SWR set with a meter so all your signals are getting in and out. A mismatched antenna system can lose you about half of your power and range; and that's hard on the radio also.
If your radio was tuned up by a shop tech, you would see the digital go part way up, but when you talked into the mic, the digital would go almost all the way up. I hope this clarified the situation for you,,, Let me know,,, Mechanic
have you happened to check the cable to your antennas? maybe you got a cut in the insulation. thats the only idea i can come up with being that you have had all the work done to it and still havin problems.
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