They probably did something.
It isn't uncommon for there not to be any outward signs, but after you figure out what is wrong the causal events become clear. It could even be as simple as they plugged the tuner in with power on.
It isn't uncommon for there not to be any outward signs, but after you figure out what is wrong the causal events become clear. It could even be as simple as they plugged the tuner in with power on.
There is one cap c754 that looks to be replaced the legs are sticking out further than any cap and one of the big black caps has some kind of white corrosion on one of legs c953
White corrosion (any corrosion) is never a good sign. Pull, clean the PCB and replace the capacitor. Remove and inspect the other one as well, or just change both.
Not looking at the schematic, I'm not sure what C754 does. Make sure it isn't shorted or installed backwards.
Not looking at the schematic, I'm not sure what C754 does. Make sure it isn't shorted or installed backwards.
Cool.
My training was clear. Remove any doubt! Make any question a known or you can go in circles forever. Never make assumptions, prove it!
It may sound like an over-cautious approach, but for close to 50 years it has proved to be the correct approach. Components can sometimes fail in funny ways, and previous service can create problems that can't be explained (as in, why did they do that???). If you just follow the evidence, it will lead you to the right answer. Sound like something else you've heard before?
My training was clear. Remove any doubt! Make any question a known or you can go in circles forever. Never make assumptions, prove it!
It may sound like an over-cautious approach, but for close to 50 years it has proved to be the correct approach. Components can sometimes fail in funny ways, and previous service can create problems that can't be explained (as in, why did they do that???). If you just follow the evidence, it will lead you to the right answer. Sound like something else you've heard before?
I found one problem q951 transistor two of the legs had broken solder joints reflowed the solder and now it’s receiving staioins on fm and fm. Just have to find sealer to try out
That depends entirely on your area and what station you want to listen to. Sometimes you need a directional antenna. The amount of multipath will determine that if your signal strength is high enough. An Omni directional antenna up high works well sometimes, or an omni-whip inside up high (I use a Magnum Dynalab whip). The "tee" antenna shipped with most tuners may work in the city, and some people can use a coat hanger or length of wire. No kidding!
One thing is true. The better your signal is without overloading the front end, the better it will perform and sound. Some folks do need a directional antenna and rotor like the old TV days.
One thing is true. The better your signal is without overloading the front end, the better it will perform and sound. Some folks do need a directional antenna and rotor like the old TV days.
Okay. Try a folded dipole (the little "tee" FM antenna) and just see.
If you get good signal strength but distortion, that's multipath distortion. Better tuners have a meter for that. If you do, you need to make it directional or at least block the direction of the multipath signal(s). Multipath is a reflected signal from the main one you are receiving. Same exact frequency but delayed in time.
If you get good signal strength but distortion, that's multipath distortion. Better tuners have a meter for that. If you do, you need to make it directional or at least block the direction of the multipath signal(s). Multipath is a reflected signal from the main one you are receiving. Same exact frequency but delayed in time.