Cobra 142 gtl/ freq counter help

[airplane1]

I Got this 148 gtl from a friend who was going to throw it away because he did a no no to it and it stopped working, I said no give it to me I will try and fix it. He has a pile of electronics on his desk, some take 12 vdc and others take 110 ac. What he did was put the same connectors on every piece that he has and one night plugged the 110 ac into the 148 and it stopped working, no smoke or sparks just will not work.

I checked the fuses in cord and they are fine, checked inside and no burn marks of any kind and no burnt smell. I tried to check all the diods around the power plug but nothing looks abnormal.

OK, what would 110 ac do to it? any ideas on it? It is in very nice cosmetic condition and was working great till.

thanks,
AP

 

[Robb]

Wow; like just everything that is connected to the 12v rail in the schematic.

Audio chip, voltage reg, final, driver, and a few other parts.

 

[airplane1]

So like I guess I wont replace a diod and be happy? Are you sure it would be all that?

I hate to trash but I guess I tried.

Thanks,AP

 

[Robb]

Are you sure it would be all that?

D-56 is a 1n4003 diode found near the power plug if it is a 148.
Remove it. Then hook up the proper power plug and be sure to properly phase the +/- power wires for a test; then see if it works. DO NOT hook up the wires w/o a diode in it - if you aren't certain. That diode is about $.05 in cost; or pull one from a scrap radio. But if the radio doesn't light up; then it is most likely fried . . . but I doubt it will work . . . it got 110v of ALTERNATING current for approx 1/60th of a second; plenty of time to do the damage . . .

 

[dejaskysdad]

i sure like to have it for parts lol