Tram D201A help please-tubes light up but nothing else comes on

[KneeBiter]

Center pin coming out of the board

 

[Adamf]

Hi, thanks, it reads 20.8162mhz which I guess is a good thing? Adam

 

[KneeBiter]

Hi, thanks, it reads 20.8162mhz which I guess is a good thing? Adam

That means your synth is putting out. So that's good. Did you check all the connections at the bottom of the ba board and pins?

 

[Adamf]

Hi KneeBiter, the BA board has a heatsink with some transistor sort of glued to a cross piece to hold the heatsink, I will undo that gunk holding it carefully and pull the board, back soon. Thanks, Adam

 

[KneeBiter]

If you know 100% for sure the radio was working before being shipped then something banged loose or cracked. If you are only guessing it might have worked before shipping then you are chasing the unknown. That radio has so many resistors that take abuse and the circuit board disintegrates. So looking with serious magnification will help isolated some board problems.

 

[KneeBiter]

That brace looks to me that someone pushed on that board and it fixed an issue of bad connections so instead of the correct fix they pushed it to that position and glued that brace to keep it there. Quick fix but I would seriously inspect the entire area as it is a known problem spot.

 

[KneeBiter]

And be very careful. You are playing with high voltage.

 

[Adamf]

Yes, I pulled the board, it looks good, no bad parts, no cold solder joints, I will clean the pins with DeOxit and look carefully all over. Thanks, Adam

 

[Adamf]

I will also reflow the solder points for the connector pins on the BA board

 

[Adamf]

AND thank all you good peopel for trying to help, I appreciate it. Adam

 

[Adamf]

Oh well, I refklowed the contacts for the pins on the BA board but no help. Power is in the radio but nothing on the front panel lights except when I switch from AM to USB or LSB, the SSB light does light up. Adam

 

[nomadradio]

No, the wire connecting the pc board to the upper socket's center pin is where you probe for synthesizer board output. Also the tap-off point for adding a digital frequency display.

Gotta wonder why there are two black plastic relays stuck to the solder side of the receiver pc board. Not a mod I'm familiar with.

73

 

[Adamf]

OK, I'm not sure what to do next so I will take my shovel out to the back yard and give it a good burial. Again, thanks to all who tried to help. Adam