Question about Amplifiers & Preamps

1 Answer

Audio Amplifier JVC Model A-GX3

I need de schematic diagram for these audio amplifier or to know de tipe of transistors output

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 363 Answers
Re: Audio Amplifier JVC Model A-GX3

If the service manual is not available on the JVC websites then you should just Google search "JVC A-GX3 service manual" There are many websites that archive manuals. You'll probably have to pay for a copy. Why can't you disassemble the unit and see the output transistor numbers first? More importantly how do you know this is the fault?

Posted on Sep 22, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Red light stay on no sound

Check for shorted speakers, if ok check output transistors for short

Dec 24, 2013 | QSC GX3 Amplifier

1 Answer

My problem i lost transistors for power for car amplifier audio apache i need numbers for transistors

There might be still other power transistors left, same part number

for the power inverter ( IRLZ43N on some ).

Except for the Main Amp that have Complimentary Pair

check for possible burnt or open resistors , too

Jul 23, 2012 | Amplifiers & Preamps

1 Answer

What kind a outputs transistor use a QSC Gx3 power Amp

this power amp uses 2SA1962 and 2SC5242 output transistors. You can download the schematic diagram from this website.

May 10, 2012 | QSC GX3 Amplifier

1 Answer

I have a parasound 5250 5 channel amp. Channel one is not working. Is there a fuse?

hi, there is no fuse on amplifier output only power supply, the problem is some parts of electronic that drives into audio output of the amplifier maybe are shorted like transistors, diode or amplifier Ic's. bring it to a nearest service center to check it. or if you have a knowledge in technical yo can used multi tester to check it. Note: unplugged it first before you open the cover to check it. thanks

Mar 28, 2011 | Parasound 5250 5-Channel Amplifier

1 Answer

I would like to hook up my amp to my pc or laptop what extensions do i use and what setting do i put it on to receive sound? It's a JVC RX-884V

If you computer has only analog audio outputs, you could use one of the audio components input , turntable, cassette or CD player input, for this you'll need a cable called " Y ", it's called this way because its shape, in one end you have two white and red RCA plugs which are connected to amplifier, in the other end you have a 3.5mm stereo plug that connects to your computer audio output, preferable the line audio output. If you have digital audio outputs from your computer, you can use the coaxial or optical inputs, the first requires a digital coaxial cable RCA plug both ends and the second an optical fiber Toslink cable.

Feb 23, 2011 | JVC Amplifiers & Preamps

1 Answer

Schematic drawing of Adcom GFA-5300/how to check driver circuits

The driver circuits should be just before the outputs in the circuitry. The easiest way to check this circuit is to remove the outputs and turn on the unit. Measure each of the transistor pads relativce to ground for DC voltage. You should see the following: B+,0.6V (or 1.1V), and 0V on one transistor and negative values on its compliment. If you have questions, measure the pads and post the measurements here. In some cases the output transistor needs to be in place to get the values above, so if yours don't measure that way, just post what you get and we'll continue from there.


Dec 08, 2009 | Adcom GFA-5300 2-Channel Amplifier

2 Answers

Every time I turn the amp on it shuts its self off.

disconnect all speakers and test if the problem corrected you will have a problem in your speakers(either wire or speaker itself)-try to connect the speakers one by one until you find the bad one and change it--if all above does not work send your amp to service center near you

Mar 30, 2009 | Crest Audio CPX-900 Amplifier

1 Answer

Power On + red LED turns on + but final relay (click) don't come so no sound

Your audio output transistors are shorted and your unit is staying in "protect " mode to protect your speakers from 40 to 60 volts that is being sent at them from the shorted outputs. If you can use a meter you won't need the schematic MOST likely because the outputs are USUALLY the only parts that short out. The output transistors( or chip ) are mounted to the large, finned heatsink. The #'s on the transistors start with "2SA-" and "2SC-" followed by numbers. There are two output transistors per channel. If your unit uses an IC for audio output then the # on the IC will be "STK-" followed by numbers. These parts are available from Good Luck!


Oct 17, 2008 | Denon PMA-2000R 2-Channel Amplifier

Not finding what you are looking for?
Amplifiers & Preamps Logo

Related Topics:

1,228 people viewed this question

Ask a Question

Usually answered in minutes!

Top Amplifiers & Preamps Experts


Level 3 Expert

4518 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

The Knight
The Knight

Level 3 Expert

66685 Answers

Are you an Amplifier and Preamp Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides