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May 15th 07, 04:16 PM
posted to rec.radio.shortwave
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Sony sw77 problem
In article ,
Clive wrote: "Mark Zenier" wrote in message ... In article , Clive wrote: Hi all I have a Sony sw-77 and it appears to be acting up. It seems to have a problem in the power dept, now I'm not sure if it's because of the batteries, as I have cheap things in it at the moment, but its still the same with the ac power supply fitted, it sort of crackles and goes quiet for a few seconds, then sometimes it sounds as if it drifts off frequency, but then it comes back again, it is an intermittant problem, but very annoying, any ideas anyone please I've had problems with the coaxial(barrel connector) power jack on various equipment. The connections to the circuit board go open because it gets stressed a lot with the plug and cord getting moved or bumped and the only thing holding it in place is solder. And in some stuff, there's a switch to disconnect the battery built into the power jack so that supply goes through that same problematic part. Wiggle it and see... Mark Zenier Googleproofaddress(account:mzenier provider:eskimo domain:com) Hi Mark Yes,I see your point, it does crackle a bit when I move it around. I think it could be a problem with the voltage stabilizer, as it sort of goes haywire from time to time, getting the same symptoms you get when batteries are running low, also it goes ballistic when you push the light button. Further investigation I think is needed It could also be a poor (resistive) connection in the wires/traces supplying the power. I would try resoldering the power jack, first thing. The frequent problems you find when fixing stuff are simple. First the connectors, then capacitors, and then you get to the more esoteric problems. (After you make sure the batteries are good ;-)) Mark Zenier Googleproofaddress(account:mzenier provider:eskimo domain:com) |
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