Question about Legacy Audio American Legacy II LA890 Car Audio Amplifier

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No power in my amp

I have good power goin to my amp but it wont turn on. i need a diagram so i can check the resistors and all that. tha amp is a legacy LA790. please help

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If you are going to try to repair this yourself and can't find a schematic diagram, read the following page. It should help you through basic troubleshooting.

Amplifier Repair Primer

If you have questions, let me know.

Posted on May 03, 2008

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Posted on Jan 02, 2017

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Have a kenwood KAC-8101D and found a burnt resistor at R101 brown gren brown gold.. The blue power light turns on indicating power but no sound comes out anyone know what else is fried or what else to...


without a diagram, and the exact location of the resistor in the amp, it is almost impossible to say if anything else is defect. Most of the time, a burned resistor, if it is defect, it had to much current, so the transistor (alone or in a IC) got to much and perhaps also died.

If you don't have the skills, tools and diagram (service manual) don't start it, you end up with something that does not amplify anything.

Jun 10, 2014 | Car Audio & Video

1 Answer

Amp is off wont turn on..


Check fuses 1 should be on amp other is near battery on the new wire that goes to amp. If both are good check power at main and check remote with system on. If you have power and fuses good, your amp has an internal problem and needs to go to manufacturer for repair.

Mar 24, 2010 | Directed D800 Car Audio Amplifier

1 Answer

I have kikcer amp 1500.1 is workin good for one year whith 4 memphis 15'' and one day just goin in the protection mode when i turn the radio up can you help me please


sounds like your amplifier does not have the power that your subs need check the rms out put on your amplifier and check how much rms your subs can handle if your amplifier has less rms power then your subs theirs probaly your problem that what happens when it kicks in to protection you could in up fring your out put chips in your amplifier not trying to say that the problem but check your rms power make sure the amp and subs can handle the same power

Oct 31, 2009 | Car Audio & Video

1 Answer

I have Sony XM-2150GSX amp on offset cant get it off


check for a short on one of the edges or a resistor on the edge of the board

Jul 04, 2009 | Sony XM-2150GSX Car Audio Amplifier

1 Answer

Got the hot nd ground conted nd the aux cables from the raido conted nd the amp does not turn on


The amp needs a remote signal to turn on. This is provided by wire from the back of your head unit. Also look for a 'REM' or 'remote' connection on the amp (besides the 12v and ground connection).

Look at the wiring/setup diagram for your head unit to determine which wire/connection you should use for this.

If the head unit does not have a specific 'remote' wire, you can usually use the power antenna wire to provide a turn on signal to the amp instead.

Apr 13, 2009 | Bazooka EL1500 Car Audio Amplifier

1 Answer

The amp wont come on


sorry to have to tell u this but you blew your amp or just the channels this happens when you dont have the ohm rite for amp and speakers

Dec 20, 2008 | Nitro BMW-482 Car Audio Amplifier

1 Answer

Car amp wont turn on


I'll assume that you've checked the amplifier's on-board fuses.

With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

Jul 29, 2008 | Alpine PDX-1.1000 1000W x 1 Car Amplifier...

1 Answer

Amp problems


The main thing that comes to mind is whether you've checked the in-line fuse on the positive wire. Most amp installations are supposed to have a fuse within 1ft of the battery terminal for just such a reason. Next, if you have a voltmeter of some kind (or know someone who does), check to see if you still have 11VDC-14VDC at the power terminals of the amp. If you do, then check the remote turn-on lead (which is supposed to connect to either your head unit or the ignition). If my memory serves, the remote wire should be high (about 12V) when the amp is being told to turn on and low (less than 2V) when it's being told to turn off.

Jul 29, 2008 | Alpine PDX-1.1000 1000W x 1 Car Amplifier...

1 Answer

Amp cuts off...


Are the woofers single or dual voice coil?

How many ohms per coil?

If they are dual voice coil, are the coils for each speaker wired in series or parallel?

Are the speakers connected directly to the amp or are the speaker in series (one wire from each speaker connected to the amp?

Have you checked the DC voltage at the amp when you're playing it at high volume (where it cuts off)?

Dec 22, 2007 | Kicker ZX1500.1 Car Audio Amplifier

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