Question about Legacy LA838 Car Audio Amplifier

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Smoking Amp/Fuse Blowing

Ok im having similar problems as you seen up above. im not good with electronics as far as checking the B+ thing lol but my amps doin the same thing. i was intending to get my compacitor hooked up but i got set back b/c of money probs. So i had it for about 1 month and now its blowing my fuses and smoking (in amp that is). its smoking from the battery hook-up side.

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Re: Smoking Amp/Fuse Blowing

Amp blows fuses when i have hard bass to it some is ok

Posted on Jan 23, 2007

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Re: Smoking Amp/Fuse Blowing

Sounds like you may have a shorted switching Transistor in the switch mode power supply causing a short to ground. If you are technical enough. Remove power remove cover and do a continuity test on the transistors on the heatsink. non of them should read zero resistance between the three legs. in all connection configuration you use to hook up your meter. If one or Two or even all of them do you must replace with proper part.

Posted on Aug 03, 2006

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1st of all secure your subs/amps good. the tighter they are not only is it safer but your bass will hit harder cuz the box can't move and absorb any of the sound... As far as your amp, check the fuses on the amp. when your ground was disconnected it could have easily fried a protection fuse in the amp. To fix this simply replace the fuse with a new one of the same ampere rating, it shouldn't be hard to find. If all your fuses are good you'll have to see a service professional to fix your amp, or get a new one.

Aug 29, 2009 | Kenwood Excelon KAC-X811D Car Audio...

1 Answer

Im having trouble i keep blowing fuses on my amp?

you have you gain and freq knobs turned up too far, try turning them down and turn down subb level from deck

Apr 13, 2009 | Rockford Fosgate P3001 Car Audio Amplifier

1 Answer

Kenwood KAC 7202 amp not powering on

First you should test to be sure the amps main power feed is supplying 12+ volts to the amp. and that the other connections (head unit remote lead - input & output signal leads) are properly secured, if all is well then there maybe an internal issue with the amp.

It is not recommended to affix an amp directly to a speaker/kicker box, hence the vibration that may cause wire connections and/or internal electronic components to become loose or faulty.

As far as "should i take the amp apart and look at its guts"

NO, sorry but given the way you phrased your question I can assume that your electronic troubleshooting knowledge is not up to par, and that task would be a waste of your time.

Good luck

Mar 26, 2009 | Kenwood KAC-7202 Car Audio Amplifier

1 Answer

Blowing of fuses

The reason your blowing fuses is the amp needs at the least a 150 amp fuse on the wire that runs to your bat. There are fuse blocks that you can put 4 40amp fuse and theres the high dollor ones that you can put all the way to 200amp. When you trun up your amp its drawing to much current for the little 40 amp fuse that you have and will blow it everytime. I recomend Running a 4 gage wire to bat and ground with same. Get you a 150 or above amp fuse from a car audio shop somewhere. anyway sounds like from what you decribed, theres nothing wrong with your amp just the wires and fuse are not big enouf to handle the current that your amp pulls.

Oct 21, 2008 | Lanzar OPTI 50c Car Audio Amplifier

1 Answer

Amp grounding out

If the amp is blowing fuses, you could have one of several problems. The only one of those problems you could fix yourself is if you have a shorted speaker. A speaker that is shorted in the voice coil can cause the fuse to blow. To check if this is causing it, dis-connect the speakers and then turn it back on. If no fuse blows there is a good chance that a speaker is shorted, take the speakers to somebody or someplace that can check them properly. If the fuse still blows with no speakers connected, you have an internal problem in the amplifier.

If the fuse blows before you even turn the amp on, you have some shorted components in the power supply. If the fuse blows after the amp gets turned on, you have some shorted components in one or both of the output channels.

Unless you have some experience with electronics and have the proper tools to troubleshoot electronics, there is really nothing you can do yourself to fix the amp if it has internal problems.

You should take it to a repair center and get an estimate for repairing it, that way you can decide if the cost of the repair is worth the price of the repair. Sometimes it is better to just buy a new amp, but you first need to know what it will cost for repairing it. There is no way to tell you how much it will cost to repair without having the amplifier in front of me and troubleshooting it to see exactly what is wrong.

If I can be more help let me know, I have been repairing car and home audio equipment for almost 18 years and can offer you good honest advice.

Good luck,


Jul 27, 2008 | Car Amplifiers

2 Answers

Rockford p5002 amp is smoking...

Completely disconnect the amp and remove the cover. Look for anything that is discolored or burned.

Did you have one sub on each channel before the sub blew?

Jan 23, 2008 | Rockford Fosgate Punch P5002 Car Audio...

1 Answer

Lost one channel

Have you tried switching the signal cables?

Try moving all of the controls and switches. A dirty contact can cause similar problems.

If these don't help, you probably have a broken connection in the amp. Generally, when semiconductors fail, you have excessive current draw and the amp goes into protection or blows the fuse.

Oct 26, 2007 | Jensen XA4150 Car Audio Amplifier

1 Answer

My amp turns on then off while it slowly blows the fuse out

If I were a guessing man, I'd guess that you had your amp hooked up in a bridged configuration. And also that you connected your two speakers in parallel (plus to plus and minus to minus). And if I were to further guess, I'd guess that you have a blown amp now because of what I mentioned above. Sounds like you need to spend some quality time with your favorite electronic repair shop. Good luck.

Feb 23, 2007 | Hifonics BXI 1606D Car Audio Amplifier

4 Answers

AMp keeps blowing fuses

Hi You can refer to my detailed solution above...if you still have issues please feel free to contact.


Feb 15, 2007 | Kenwood KAC-7202 Car Audio Amplifier

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