Solid State 3500 - Stereo Light Quirk

[CaseyWKC]

Hey ya'll, finishing up a Sansui Solid State 3500.

Have one final issue with the FM stereo light.

I'm getting stereo and good reception - but the stereo light always stays on - on strong stations when tuned into FM and getting stereo the light is on but dim, on weak channels with with lots of interference the light gets three times as bright, kind of doing the inverse of what it should be doing.

Advice?

Thanks!

 

[chazix]

Advice?

Not really, but you might want to say whether the lamp is original. Sometimes LED retrofits have odd behavior.

 

[CaseyWKC]

Not really, but you might want to say whether the lamp is original. Sometimes LED retrofits have odd behavior.

Haha I figured. Once I get through my morning routine I’ll give it a once over again to see if I’m missing anything.

I subbed an LED at first and thought that might be the issue but after replacing that with an appropriate mah and voltage incandescent - behavior was the same.

 

[Bruno Primas]

There is a trimmer in the mpx board f-1190 than can be adjusted too high so the lamp will stay on. Tune to a place where there is no station and the lamp is lit. Adjust the trimmer to see if the lamp goes out. If it does, adjust it so the lamp JUST goes out and then go to a known station to make sure it comes back on and in stereo.

 

[CaseyWKC]

There is a trimmer in the mpx board f-1190 than can be adjusted too high so the lamp will stay on. Tune to a place where there is no station and the lamp is lit. Adjust the trimmer to see if the lamp goes out. If it does, adjust it so the lamp JUST goes out and then go to a known station to make sure it comes back on and in stereo.

View attachment 3713731View attachment 3713732

Thanks! I missed that in the SM.

Unfortunately this trimmer doesn't seem to have any affect on the stereo lamp.

I've been trying to find TR407 which drives the stereo light and don't see it anywhere.

 

[Bruno Primas]

 

[CaseyWKC]

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