Superstar 120

[2FB327]

I'm trying to resurrect a Superstar 120 and need some help troubleshooting.
The radio receives, no transmit modulation.
I have a carrier (as seen on the scope) and frequency at the antenna jack, when keyed it also moves the needle on the bench radio.
I removed and tested the final and even swapped one out to test, but still no mod.
It has a pc-548 board, I know back when they came out I think there were 3 models.
Note: one thing I did notice is that it has a green tx light and a red rx light, and when keyed the green light goes out and the red rx light lights. I would think the green tx light should go to red.Not sure if that's normal.
Any help would be appreciated.

 

[sonoma]

here is a schematic for the radio. you can check the parts in the RX and TX circuit and some voltages. also make sure the PA has audio to confirm the audio IC is good.

http://www.cbtricks.com/radios/superstar/120/graphics/super-star_120_sch.pdf

 

[2FB327]

Hi Sonoma, Thanks, the radio does not have a pa jack or pa switch. I guess what I am looking for is a starting point and a place to find the correct voltages. Where I'm confused is that I have the frequency at the antenna jack and it changes when I change channels, but no mod.
I'll see what I can figure out from the diagram.