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Pioneer vsx-9900s Hello I flipped you a fixya. can you help with some test points I could not find a service manual fo rthis unit anywhere. I love this amp and wan to fix it.

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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 :)

Hit me back and let me know how you go.

regards
Graeme

Posted on Apr 25, 2008

  • Graeme Ross
    Graeme Ross May 05, 2008

    How did you get on mate? :) Any luck. Still here to help you.


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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.

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