Hello all,
Came across a Yamaha R9 with issues.Audio is only produced when
Using pre out connections fed into a seperate amp.No amplification
At all.
Came across a Yamaha R9 with issues.Audio is only produced when
Using pre out connections fed into a seperate amp.No amplification
At all.
An externally hosted image should be here but it was not working when we last tested it.
Does the relay click?
Check for DC on the emitter resistors for both channels.
Yamaha R-9 Manual - Natural Sound AM/FM Stereo Receiver - HiFi Engine
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What result do you get with quiescent current measurement? Is there a power supply issue if wrong?
We are only concerned with the DC off-set at this point, forget about the bias.
If the relay doesn't click, either the amp is putting out DC, or all the small electrolytics need to be replaced (start with the protection circuit).
If the relay doesn't click, either the amp is putting out DC, or all the small electrolytics need to be replaced (start with the protection circuit).
Yamaha
Hello,
I finally got a chance to open up the Yamaha.At the top left corner near the power supply, there is a row of 5 Transistors.The 3rd and second one from the left are toast.The area has a blackened look to it.
Hello,
I finally got a chance to open up the Yamaha.At the top left corner near the power supply, there is a row of 5 Transistors.The 3rd and second one from the left are toast.The area has a blackened look to it.
I would just use it as a tuner-pre at this point, unless you don't care what it will cost to repair.
If the pc board is cooked, simply replacing all the burnt out transistors, resistors, and diodes won't insure a working and reliable unit. Things may still be shorted out and/or open. The blackened part of the board becomes partially conductive, and any solder joints or traces that were overheated can get oxidized and go open (and often they look just fine).
Change your mind yet?
Change your mind yet?
Yamaha
I understand that there may be more
problems.Ya know..keep your opinions
to yourself..ok? I am here trying to get
some info..not be judged..got it?
I understand that there may be more
problems.Ya know..keep your opinions
to yourself..ok? I am here trying to get
some info..not be judged..got it?
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