Question about Yamaha DSP-A1000 5-Channel Amplifier

3 Answers

Distorted sound Hi Folks, Distorted sound at all levels including headphone socket. Can you help?. Brian Dinsley New Romney UK. Sony stereo amp TA-F448E

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  • Briax Feb 22, 2008

    Thanks, 
    speakers ok but distorted R/H channel only.
    Briax

  • Briax Mar 04, 2008

    Thanks Jango2,


    I've done what you  suggested ( very useful picture of layout too)
    but there are no ceramic resistors to the right of the transformer, which should be pretty obvious. Unable to fault find any further 
    but thanks a lot for trying.
    Briax

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Have you tried switching source channels? right to left v.v.

red

Posted on Mar 18, 2008

  • Redentor Rivera Mar 18, 2008

    sorry briax, i thought i was on another brand. your DSP a1000, i will narrow your problem to 2 parts only. Your input selector siwtch which is very common troouble or the IC chip that is also controlling the input to tone control signals.

  • Redentor Rivera Mar 18, 2008

    TAF448E ?? OR IS DSP-A1000



    If it's Yamaha, get the input selector swith replaced, that should be it. Yamaha out protection is very sensitive and slight deviation in your normal output current it will trip. Yours is distorted so it must be the signal only, common trouble for mechanical switch DSP A-1000

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Are you a technician capable of internal repair? This seems like a case of either positive or negative supply rail to right channel blown. Probably an open fuse or open series supply line resistor.
Internal view of amp here;
http://www.tarad.com/_tarad/_modules/view_image.php?picname=p6033619n3.jpg
The round orange doughnut shaped device at the left is the unit's toroidal transformer. To the right of it are these 2 legged upright, white rectangular ceramic resistors. They are typically low value with a power of approximately 5 watts. A quick cold test with an ohm meter might reveal one of them to be open.
Switch off and unplug unit before opening. Be wary of charge retained in the big fat electrolytic capacitors in the centre.
I do not suspect a case of blown output transistors since the relay does not go into protect and sound is audible but distortyed in one channel.
Safe !
Jango

Posted on Mar 03, 2008

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This is an automatic high end amp. Make sure you are using 8 ohm speakers. If the connections are correct, also use good quality speaker wire.

If this makes no difference, it seems that it would need to go to the repair shop.

Posted on Feb 21, 2008

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