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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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1 Answer

Where are the fuses on vsx 9900 pioneer


You would have to look at the circuit board, or locate a service manual. Some fuses don't look like fuses, so you might have issues. On another issue, most units don't "blow" fuses any more. If you would like more information, or would like to inquire about a repair, please visit my website at audioserviceclinic.com. Thank you.

Jul 05, 2014 | Amplifiers & Preamps

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I want a manual for vsx-920


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Get into this link and download the user manual to your Pioneer set from here. If you feel any difficulty in downloading the same, get me over by Fixya comment box. I've the dowwnloaded user maual to your set. It comes upto 13.5MB in capacity. I can't upload it to you by this window as it dows not allow me to upload PDF files by it. If you contact me over Fixya, with your email address, I'll send a copy of it to you by return mail. OK.

Jan 21, 2012 | Pioneer Amplifiers & Preamps

1 Answer

I have a pioneer vsx-9900s- 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-...


If the thing smells you shouldn't need any test equipment apart from your eyes and nose. That should lead you to something burnt up! Unlikely you will encounter any high voltage parts.

Jan 02, 2011 | Pioneer Amplifiers & Preamps

1 Answer

Remote doen't work properly


Hello,

apart from the balance for the speak button on the remote, does other buttons on the remote work or is it all the functions on the remote that is not working any more?

This may be as a result of the faulty remote sensor or problem from the remote.

Which ever the case maybe, the remote need to be changed. But before you change the remote, if you have a friend the has the type of your remote, you can simply use it to test the remote first, before you get another remote.

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Mar 29, 2010 | Pioneer Amplifiers & Preamps

1 Answer

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here is a link to your manual:
http://www.pioneer.co.uk/uk/products/archive/VSX-AX4AVi-S/media.html
looks to be an auto calibration the mcacc turned on during the testing and setup phase. you could always put the mcacc in manual mode and go through the settins yourself. Just be aware that the setting you are talking about controls the level of you dialog channel and lowing might cause you to have less ability to hear low dialog.

Cheers!

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1 Answer

Relay clicks, no display only the volume lights


Hello,
This is a common problem with a few of the Pioneer of that era (VSX-3300, 3700, etc). A secundary power supply line is faulty and it prevents your display from working. It is not an easy DIY, but a local tech should be able to fix. It is not always the same exact cause, as there are a couple transistors, a zener diode and a cap that can fail.
You can continue to use it without any detrimental effects on the unit, and can guess the settings.
Good luck

Jun 14, 2009 | Pioneer Amplifiers & Preamps

1 Answer

Hello,I have a Pioneer VSX-D710S 5.1 reciever get hot and smell l


Heatsinks on mosfets are probably not connected, or broke connection. If you are not trained in electronics dont go poking and proding around in there, a capacitor can easily kill you. If you have some knowledge open it up and see if you see and burnt components etc. You may just need new heatsink grease etc. Does it have a fan that stopped working? If a piece is visually fried take the unit to your local electronic repair shop and see if they can solder in a new part if available. depending on the price of the amp, it would be ebetter to go spend money on a new one.

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2 Answers

Pioneer amp


maybe your relay is not function.

Sep 21, 2008 | Pioneer Amplifiers & Preamps

1 Answer

Vsx-9900s


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

Apr 20, 2008 | Amplifiers & Preamps

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