Question about Jl Audio 300/2 Car Audio Amplifier

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I have a JL audio 300.2 with blown mosfets, I know they are type n, but i need other values to know which ones to buy for replacement.

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Posted on Jan 02, 2017

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Jexx
  • 148 Answers

SOURCE: My JL audio 1000/1 amp does not work

Best bet is to send it back to JL, they do not sell the PCB with all of the components loaded on it. Most likely the transistors in the power supply have fried. Open it up and see if you can find any physical damage. Google the part numbers of the bad parts, and you should be able to fix it relatively easily. www.digikey.com is a great place for parts. Read this for more testing procedure: http://www.bcae1.com/ampfail.htm The whole site is wonderful, really.

Posted on Jul 16, 2006

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  • 631 Answers

SOURCE: Jl Audio 500/1 Car Audio

There are no fuses inside the amp.

Are any of the lights lighting up on the amp?

If so, which ones?

Posted on Jun 09, 2008

LVT7857
  • 116 Answers

SOURCE: Green light blinks slowly on my JL Audio 300/4 amp

Check your fuse at the battery. While AGU glass fuses "look" good, when you read the voltage AFTER the fuse, you can only be getting 5 volts or so. I can't tell you how many times I have seen this.

Larry T
Winona Lake, IN
http://www.cybersoundsaudio.com/cybersounds/vehiclepics.html

Posted on Jan 28, 2009

  • 77 Answers

SOURCE: jl audio 300/4 low ohms light wont go off

If the low ohms light is on then you have your speakers wired to low. I need to know some more info like what type of speakers you have running on this amp and how many. Also was it working before and then it started doing this? Check the ohms with a volt meter if you know how, if not just get a volt/ohm meter and set it to the ohms setting and then take the positive(red probe) and touch it to the positive terminal on the speaker and then the negative(black probe) to the negative terminal and see what it reads. Make sure you check how low in ohms your amp is capable of handling. If you don't know just google the model of your amp and you will find a site that has a manual or just go to JL audios web site and you should find out there with no problem. Let me know what you find so I can assist you more if need be cause I also repair amplifires for a living and have many years experienc and I'm the cheapest amp repair business you will find any where. Good luck

Posted on Aug 20, 2009

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1 Answer

Amp want turn on


Listen everyone who is having any JL 500/1 or 1000/1 amps. There are many reasons why your amps have failed. Most of the problem is the power supply mosfets shorted out and output mosfets shorted too. Those are the 2 biggest problems when you run these amps hard. Also the main power supply capacitors and the gate resistors mostly burn out when a power supply mosfet shorts. Some people if they remove the back cover may see signs of of the problem area and others will not. I have been repairing these paticular amps at least 2 to 3 a week with other amps I get in. It seems that the older ones people bought working are now failing. So this is just a quick overview of what your problem is and is part or is the problem guaranteed. Sometimes I get tired of seeing them coming in but it's what I do and know exactly where to start. I don't know at this time but I think for $160 if you send your JL 500/1 to JL they will just replace the board. Don't quote me on that cause prices change. I would call and ask. My repair depending on the damage is around $80-90 to repair these 500/1. The 1000/1 can be the same or higher. I can't tell you if I don't have it in front of me diagnosing it. As I said though, the problems are basicly the same for the most part and the amp will have to be repaired. I help people also who are electronicaly inclined and if they feel confident and can unsolder and solder and know thier way around a volt ohm digital meter I can walk them through the steps. It's not that hard everybody, really it is'nt. A little confidence and soldering and reading a volt meter and you can repair your own amp. Contact me if you need any help. Thank you!

Jan 13, 2012 | Jl Audio 500/1 Car Audio Amplifier

1 Answer

Sleuthing a 300/4 low-ohm issue. 300/4 amp history: unknown. just connected today whole system yesterday/today: head unit, 300/4(to 4 polk 6.5" component speakers brand new) 1000/1 (4-W3's),...


Are you sure you getting enough power to push everything. I have seen when the voltage is too low coming in, the amps will shut down so they don't overheat. Once they've cooled off and the volume level is lowered they will kick in again. Low voltage and a heavy draw will create massive amounts of heat.

May 24, 2011 | Jl Audio 500/1 Car Audio Amplifier

1 Answer

Need original part number for jl audio 1000/1


the ones directly across from the burnt ones is the same value

Aug 20, 2009 | Jl Audio JL1000 / 1 Car Audio Amplifier

1 Answer

Blown mosfet


Hello dancisbrown,

If you or someone you know is relatively skilled at soldering, you should be able to replace the MOSFET. The problem may be in determining a suitable replacement. First get the data off of the blown component and then go here to the MOSFET cross-reference guide. http://clivetec.superihost.com/MOSFETs.htm

After you have found a replacement, go here to purchase the new one. http://www.mouser.com/

You might want to consider replacing all 4 while you have the board out.

Hope this helps.

Apr 14, 2009 | Kenwood KAC- X810D Car Audio Amplifier

1 Answer

Jl audio with 2 12kickers cvr


it sounds like you don't have enough power to run the amp, or else it is a built in (MOSFET) overload device inside the amp. the woofer is from your discription blown. when you choose a amp and woofer you need the woofer to be able to handle more watts (MAX) than the amp can give or you will blow every woofer you connect up. you can solve the power outage by fitting a "CAPACITOR" which stores power and provides it to the amp as and when it is needed, or you will need to install another battery for the amp alone.

Jan 15, 2009 | Jl Audio 250/1 Car Audio Amplifier

1 Answer

JL 500/1 Problem


You need the old transistor. Knowing it's brown is not enough; you need to know its resistance value. It sounds like the resistor you replaced with has too low a resistance value, causing the "cuts" in sound. Find the old resistor and then use this site to find out what you need:

http://www.dannyg.com/examples/res2/resistor.htm

Jan 13, 2009 | Jl Audio 500/1 Car Audio Amplifier

1 Answer

Capacitor digital display shut on then off


It sounds like you have either a dead battery or a bad connection in the power supply line from the battery. A blown fuse can cause the voltage to drop. This is fairly common with glass fuses in fully enclosed fuse holders. You need to use a multimeter to see where the voltage drops between the battery and the amp.

May 16, 2008 | Jl Audio 300/4 Car Audio Amplifier

1 Answer

Amp cell went bad!!!


You may be able to find a local shop that can repair it. If you want to send it to JL for service, you'll have to go through an authorized dealer.

Service FAQs

Dec 04, 2007 | Jl Audio 300/4 Car Audio Amplifier

1 Answer

JL audio 300/4 amplifier noise


This can be a faulty ground or speaker wires running to close to other wires from the car. You can also buy a filter for the speaker wires.

Oct 28, 2007 | Jl Audio 300/4 Car Audio Amplifier

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