SOURCE: output
When you change the selector switch, do you hear the relays inside the unit? Is your muting button activated (found to the lower left of your volume knob)? Do you have speakers connected to A or B or both?
SOURCE: is bouncing back and forth
If it's cable driven replace the speedo cable it will be binding up
SOURCE: RCA Home Theater model RTD315W
SOURCE: My Sony STR-DE685 Receiver out of the blue now has
In receivers, there are different power supplies or power supply outputs for the receiver and amplifier sections so you can have separate failures with one area not affecting the other. From your description, I think the (probably lower voltage) section for the receiver has either lost a cheap filter capacitor or a regulator IC. Neither of these are expensive parts but I can't know what labor costs in your area might be. An honest tech shouldn't ask more than ~$100 US for that kind of repair.
SOURCE: need code for sony str-de685
Three digit codes for Sony are: 002/ 006/ 071/ 128. To know about four digit codes and other details, For more details, just type in the site name "Electro-help" to
your search engines' search box [not in the address bar of your browser],
and click search. It is an electronic
equipments service help site. All
details you want are there. Note
the position of hyphen in between words in site name, when you type it
in. The site will appear as it
is in web; subtitled as Service help to electronic home entertainment
equipments.
Pull up older posts.
You can get all details. You can locate it
either at the bottom part of first search page, or at the top of second page.
Detailed descriptions are there to help you. Sometimes, clicking on advertisements by the side and bottom
of each post might help you to get details about the availability of spare
parts; price etc:-
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