Hi there.
Recently got a second hand Yamaha RX-A1010 receiver. It was working just fine for some time, but then suddenly developed a new "feature". When powered-up from long stand-by it makes a "camera-flash-charging" noise.
I still have not opened the hood ( there is a warranty label which I prefer to keep in case decide to sell it ).
Find attached a wav file with the sound and the service manual.
From the schematics of the power supply ( pg 133 ) , it looks like the noise is happening when the main power relay RY201 closes and powers up the transformer. From there ( pg 132 ) there is another relay ( ry109 ), a rectifier bridge ( d1050 ) and the big 12000uF filter capacitors ( c1105 c1106 ).
So I guess the noise is associated to the charging of the caps? Is it the transformer or the caps?
For now I do not see/hear any issues with the functionality of the receiver, but is it possible to get worse?
By the way, what's the point of the RY109? Is it selecting different voltages for the amp side... something like "eco" mode?
p.s. the manual is too big so had to upload it here -
Recently got a second hand Yamaha RX-A1010 receiver. It was working just fine for some time, but then suddenly developed a new "feature". When powered-up from long stand-by it makes a "camera-flash-charging" noise.
I still have not opened the hood ( there is a warranty label which I prefer to keep in case decide to sell it ).
Find attached a wav file with the sound and the service manual.
From the schematics of the power supply ( pg 133 ) , it looks like the noise is happening when the main power relay RY201 closes and powers up the transformer. From there ( pg 132 ) there is another relay ( ry109 ), a rectifier bridge ( d1050 ) and the big 12000uF filter capacitors ( c1105 c1106 ).
So I guess the noise is associated to the charging of the caps? Is it the transformer or the caps?
For now I do not see/hear any issues with the functionality of the receiver, but is it possible to get worse?
By the way, what's the point of the RY109? Is it selecting different voltages for the amp side... something like "eco" mode?
p.s. the manual is too big so had to upload it here -
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