Question about Yamaha RX-770
Posted by Anonymous on
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Posted on Jan 02, 2017
there is a bulb inside the backlight on the lcd display.it is 12 volt and alot of manufacturers run it from the +- 15 volt preamp power supply,on the plus rail.when the bulb burns out it can activate the dc speaker protect,or some other 12 or 15 volt circuit..if it is a flourescent display that is a different problem.those run on 5 12 18 and -32 volts.there is also a 6 volt ac filament voltage.you need the schematic.
Posted on Jun 14, 2009
SOURCE: Sometimes only one channel plays
It sounds like you know what the problem is. Get it fixed.
Or try this temporary fix.
Or turn it off and manually operate the selector and all controls a thousand times to wipe the apparent oxides from their contacts.
Posted on Jul 06, 2011
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