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Hi all. Been a while since I've been around. I picked up another radio and got a non-worker. Maybe I should quit buying these things at yard sales. LOL. I put it on the bench and fired it up. RX is good. Key the mic and found RX/TX light functioning. Look at the meter and I have no output...

FOUND IT! The vol/squelch pot! The wire that goes to the board ground off of the squelch part of the pot had broken off. I was tracing the squelch as I just had a feeling. Went back to the main pot and checked the wires. Found a black wire broken off. Soldered it back and wa-la! Sound. The...

Thanks for the reply LC. I gave it a try and that wasn't the answer to the problem. I put in a jumper to by-pass as you said. It was worth a try. Thanks for the Idea. I've replaced a couple of these jack before so I've seen this issue. Still seems odd that with my Tracer on the speaker wires I...

This is an odd one to me. Hoping someone can point me in the right direction. I used another radio and I hear that the cobra 29 LTD chrome is transmitting. I also see on the meter that I'm getting RX from the other radio. When I turn the radio on I get a pop so I know the speaker is good and...

Great. Thanks for letting me know. I'll give it a try. When I get the chance. For now at least I know what the issues are and both will come to life soon.

Thanks for the offer of the part but that is not the right number. Guessing I'll do some testing to see if there really is a difference between these transformers. They might have the same values in the end, just different numbers for the different radios. Who knows. I should be able to find...

I believe your right as I've got both service manuals but with the different part numbers... Guess its worth a try. Dont think its going to hurt anything to give it a go.

The number on the transformer from the 25 are not the same. Now I guess its possible its the same one. But different numbers so I didn't try it. As far as why the transformer went bad...Someone ran the radio with a bad antenna for a long period of time. Took out the Driver and the D8 diode...

That pretty much is it. I found that T1 on this Cobra 29 LTD Classic is bad and I need to buy a replacement. Part number EI-28. Anyone know where to buy one? I know its bad as I took one out of another working radio and swapped it out and it came to life. Audio once again. But I'd like to have...

OK, PA does work and TX is fine. Just no RX. Unless I do what I said. Will go theu the solder joints again next week. Thanks for the comments.

You know i never did check the PA. It does tx with no problem. Thanks for pointing that out. Honing some razors right now but will try to pull the uniden out and try the PA. Ive solder about everything the the RX section but guess i can go over it again.

Hi all. Picked up this Uniden 68 and used it for a couple days. Its a used radio. Got it for pretty cheap. The other day the RX died. So I took it out of the truck and put another radio in the truck. Same mic and power cord. Anyways, I've got this Uniden home and injected a signal into the...

I noticed that if I adjust VR4 Modulation pot, That I get no change. This is making me think its before the VR pot. I'll check back tomorrow and see if anyone has any comments as its beer 30 now and I dont drink and solder. Ha.

Thinking you ment the 2078. Thanks for your reply. I pulled the audio transformer out and put in the one from the cobra and no difference. D8 tested good so I guess its time to check on the audio chip. Got a bunch of those laying around. But ive never seen one just barely work.

I ended up putting a CB in the truck. I'll keep in mind what my next radio will be but for now... The Gas Range in the kitchen died and then the Clothes dryer died the next day so, I had to keep the wife happy. No funds for playing radio. Bummer...

Sorry guys. Been on the road for a while. Thanks for the comment Loosecanon as that is about what I had told him. I'm not going to don't crazy stuff to his radio and make it sound bad. He left me alone about it now. Not sure what he wants went his employer is limiting him. I mean, a 66 works...

Picked up a Uniden pc76XL for 10.00 bucks. I talked him down from 20.00 bucks because is stinked like burnt components. Got it home and found the final plus R123 toasted. The final had a hole burned thru it. So I dug up a parts radio Cobra 29LTD and pulled R123 to replace the resister and R56...

i see. 2 different things. ok, thanks for clearing that up for me.

Leapfrog, your link is to the MD1. if you look at the previous link above, its for the sp1. (i think it was) and it says 4 pin uniden, cobra, galaxy, etc... im still hesitant so i sent a pm to exitthirteen asking for his opinion. guess we might learn something here. at least i will.

and this was installed in a AM only radio like a cobra, uniden or something of the same sort of radio? Id be willing to give it a try/test. its not my money. ha. I'll just be sure to tell him which one to buy. I dont think they cost much anyway. but ill let him know before hand that if is...