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Vsx-9900s Hi I had my Pioneer vsx-9900s cranked today and I heard a couple of clicks then no front panel or sound. One click from standby to on but nothing. Think it could be the power amps

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Hi angelo40

The amp sounds like it has a primary power supply failure and/or may be in protection mode. First, I would check for any blown fuses, replace any you fint with exactly the same type and rating. I can advise you here if you are not sure. If the unit blows a fuse after replace any failed ones, then there is a short circuit that you will have to trace out in the unit. DONT KEEP REPLACEING A BLOWING FUSE You generally are just doing more damage to the amp.

If all the fuses are OK and you are savvy with electronics and soldering, you could open it right inspect for these problems., and you have a multimeter, do some powersupply voltage checks, also check for that the main transformer is ok. Resolder any dry joints you find.

It may also (and or) have a problem in the output stages. Running it hard may have produced some dry solder joints, or blown a transistor in the output array. Happy to advise you further, just ask :)

regards
Graeme

Posted on Apr 21, 2008

  • Graeme Ross
    Graeme Ross Apr 22, 2008

    It may be outputs, hit me a FixYa rating and we can investigate further.

    G

  • pioneerVSX Jan 01, 2011

    Any chance you're still checking this post? I have the same amp- was running it hard for New Year's and at the end of the night it started to smell and then the sound stopped dead. The front panel and all controls work, but no second click- Also the A/B speaker selectors don't produce a click anymore when you turn them on and off. I am wondering about the output array you mentioned above. Is this checkable/replaceable? I don't mind tearing into this thing with a multimeter, but don't want to get nailed by a capacitor somewhere! THANKS in advance for any guidance!

    Steve

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Hey man,... no worries.

Were any fuses blown? Check this first and foremost before you do anything else. If there were blown fuses, you then (if you are familiar with how), need to check the output stages for shorts. NOT generally to ground as you have suggested.... but more between the center and outside pins (collector emitter short we are looking for here) To check the output transistors properly, you need to unsolder leg and check each of the output transistors junctions base emitter, and base collector, and also collector emitter for any leakage. Once you find the offending channel(normally there is only one), you need to then carefully check the driver transistors also. Pay attention to low value resistors about the output stages, small signal and zener diodes and if they are there, any power diodes. If you are unsure of the condition of a part, then replace it to be sure :)

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