Older Bose Wave Radio- Does not have CD
Radio powers up...display lights up. Everything looks normal. When you turn on the radio or aux (ipod) you don't hear anything right away, but after a few seconds you hear a loud screeching noise coming through the speakers. Buttons become useless.
Must pull plug to stop noise.
Plug in radio...start again...same result.
Any Ideas?
I can tell you what to check if you know how to use an ohmmeter. But I warn you you could get shocked if you do not know what you are doing. The transformer has 3 windings, two are for DC voltages, and the other is 3V AC.Your meter can measure those using the AC scale. Next, check the voltage on the 3 terminal regulator IC. One leg will have 18V, the output will have 10V. Again please use CAUTION! Finally, the to-92 transistor Q1 is used as a 5V regulator. Check it (with power off and unplugged) for any shorts, especially base-emitter. If non of these ideas work, I would offer to buy your non working unit if you decide to get rid of it.
Seems to be a common problem with these radios. check my post at what to look at . the mosfet guy.
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when powered on loud rumbling noise that is constant. You can't turn the sound dn or up and it constant. Only way to make noise go away is to power off...
Same exact thing. Model AWRC1G; Wave radio/cd. Ready to chuck it out. Any thoughts??
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