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Sony STR AV-19 receiver

Discussion in 'Troubleshooting and Repair' started by craigr64, Jan 10, 2010.

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  1. craigr64

    craigr64

    3
    0
    Jan 10, 2010
    I have a receiver that when it powers on, it can take about 10 minutes for the audio to come on. Sometimes, it never does. I am looking for some direction as to what could be the cause before I trash this unit and buy a new one. I am assuming it is not worth the cost to take it in for repair. Thanks fro your help.

    Craig
     
  2. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    I'd try to measure if (one of) the output(s) have a DC offset. Too much DC would prevent the protection circuit from connecting the speakers until the offset drifts within tolerance.
     
  3. craigr64

    craigr64

    3
    0
    Jan 10, 2010
    How would I go about measuring that?
     
  4. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    It depends on how "adventurous" you are. Obviously a service manual would come in handy, and if you are to do something about it you'll have to open the receiver anyway.
    You could start with measuring the DC on the speaker outputs (w/o speakers connected). Of course you won't read anything until the protection ciruit "approves" it, but if there's then a few hundred millivolts - and they gradually go down - you can assume that DC offset is the problem. Maybe only one channel is affected.
    Then there is the issue of fixing it. Some amps have an adjustment for it, others are fixed - and then there may be a leaky capacitor or something being the culprit (and for that a diagram is a must).
     
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