2950 first gen Signal meter not working

[Alabama Trainman]

I have a first gen. (Orange display) 2950 that the receive bars are not working. They work on transmit. Any ideas? I have replaced all electrolytics in the circuit. IC1 was replaced and all transistors and diodes in the circuit check ok.

 

[brandon7861]

Sorry man, I don't know how I missed that you already checked those parts. I must have stopped reading at the problem.

 

[Xracerx13]

I know your smarter than this and dumb of me to suggest, but weirder things have happened. Check that the swr button isn't on.

 

[Alabama Trainman]

I know your smarter than this and dumb of me to suggest, but weirder things have happened. Check that the swr button isn't on.

Swr button is off

 

[Dr_DX]

D14 Ok? Correct polarity on C39?

 

[Dr_DX]

White and Gray shielded wire connects from J104



To CN608



Q603 good? Signal/voltage on pin 14 of U604?

 

[Alabama Trainman]

White and Gray shielded wire connects from J104

View attachment 68086

To CN608

View attachment 68087

Q603 good? Signal/voltage on pin 14 of U604?

View attachment 68089

Thanks, Dr-DX. Good information. Will follow it thru and report back.