Cobra 148 GTL Taiwan alignment problem / question

[Handy Andy]

Sorry to Hijack...

@Low_Boy - while you're here...check this link out...

https://www.worldwidedx.com/threads/trc-453-no-rx-tx.235386/

Then remember your Pc-122 - the one with the broken mic jack?

You have a red TX lite because the PLL side of things is working..

But if the other half of the IF - that being the clarifier side (AN612 and or audio) you may have a older cap that failed or was put in the wrong way - look by the AN612 - check it's pins for voltage - especially Pin 6 when you TX...

Why does the Red LED work but IF quits, just that, it (PLL) doesn't check the other IF side - the thing when it TX's sends power the Mic feed too - that edge trace - along the front of the board under that ribbon cable - it loops to the PLL and around to the MIC side - by VR2 (SQ) - if it ain't all hooked up - Mic side won't work because it can't get power...

 

[Low_Boy]

Andy cool. I was looking at that PC122 last night and wondering what to do with it. Boy I have a lot of things to look at this weekend.
Thanks.
Actually I tripped over it.

 

[Robalo]

HEY LOW-BOY DONT GET MAD IF YOU WORKING ON THE RADIO AND SOME ONE CALL YOU FOR DINNER LOL

 

[Low_Boy]

I am laughing Robalo because I am picturing myself doing just that lol.

 

[Low_Boy]

I found another resistor that had been changed. R175 changed from a 33k ohm to a 270 ohm resistor. Replaced R175 with a 33k no difference. R174 was correct.

 

[Low_Boy]

Also forgot to mention X3 tests good.

 

[Low_Boy]

Just found the problem. Missing white wire from just under R44 where the Orange clarified wire goes should be a white wire going to just under VR3. The Orange wire should be in the hole just below where it is. What were they trying to do?

 

[Robalo]

I LIKE YOU TENACIOUS TO FIX THING. ALWAYS TOMORROW I DO IT BETTER

 

[sonoma]

good find Low Boy. these kind of repairs no one can really help you on since it just takes a good set of eye's to find some ones goof up.

 

[Low_Boy]

I looked at that missing wire and thought it was a newer model and possibly design change. Then saw the white wire on two more radios. I flipped it over and touched a jumper to both points and the frequency went up. Today I will install the wire where it belongs. Then the rest of the caps and glue removal.

 

[kaos513]

good find Low Boy. these kind of repairs no one can really help you on since it just takes a good set of eye's to find some ones goof up.

i have encountered issues where the one wire was barley soldered to the board took me 2 weeks to find it, happens in this hobby.

 

[Handy Andy]