Question about Autotek MM125.2 Car Amp

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Amp goes to protection mode. if the fuse is too small?

Amp goes to protection mode.if the fuse is too small will it make the amp go into protection mode?

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Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. . Double check all connections. Good luck.
A thumbs up would be greatly appreciated if this answer is helpful to you. Worth fixing.
amp goes to protection mode. if the fuse is too sm - amp-goes-protection-mode-fuse-small-yyiigz0vif4kye35rdc5kjb1-5-0.jpg

Posted on Feb 06, 2015

  • chris watts Feb 13, 2015

    I have a car stereo that had something similar happen where it would turn off and then later could be turned back on but would then turn back off minutes later. I opened it up and found that where the left and right channel output amplifiers were, the heat compound had dried up and were causing them to get hot. I reapplied some heat compound and all has been well since. It may be that this is causing your problem. Hope this helps

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No the fuse will just blow usally amps go into protec. mode when they start to over heat usally caused by playing at high levels for extented periods of time or not enough air flow around amps heatsink vents

Posted on Jul 16, 2010

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Can anyone help


What size is the amp and how many watts is the speaker(s) you have it ran too? If your speakers are trying to pull too much power from the amp it will turn itself into protect mode to keep from blowing a fuse as well as if you are pushing to many watts into small small speakers it will do the same to protect from blowing the speakers I would recommend turning the settings on the amp down slightly and then trying it out also make sure your wires arnt crossed adjusting the setting as it plays is the easiest way to fix the problem also make sure the bass isn't all the way up on your head unit

Jul 12, 2013 | Car Audio & Video

1 Answer

Kenwood kac 628 red light comes on and no audio output


The red light you describe on your amp, is the protection mode warning light. An amp goes into protect for many reasons. Here's a checklist.

1st check the fuse (s) on your amp and make sure they are not blown.

2nd check the inline fuse next to your car battery (if you have an inline fuse)

3rd, disconnect the speaker wires with amp on, does the light go off?

4th check your ground, this may be ok if you have tried another amp with the same wires.

5th.if none of these turns the protect mode off, it may be an internal fault.

you may have blown transistors and it is a tricky job to repair and costly.

Jan 28, 2013 | Kenwood KAC-628 Car Audio Amplifier

1 Answer

MY soundstream LiL Wonder 4.620 is only going in protection mode


Disconnect all speakers Meter power, remote, ground at amp, if all is good move on, if not check main fuses
Turn amp on; If in protect mode then your amp is toast Turn amp on, if not in protect mode then start reconnecting speakers one by one until your amp goes into protect mode, then you'll know which speaker is bad.

Sep 19, 2011 | Car Audio & Video

1 Answer

I wanna supplied my Amplifier Lanzar MNX 250 with an 12V - 30 Ohm battery, but the led of my amplifier is red and my speaker doesn't play music. How can I fix the "protect mode" in which the...


  1. The battery is 12 volts and Ohms has nothing to do with your amp installation.
  2. Was the amp running and got hot? Many times an amp will go into "thermal mode" when used for an extended amount of time and need to cool down but I assume if you are trying to hook it up you were not using it.
  3. You need to check the ground wire real well. A loose ground will cause protect mode.
  4. Recheck the speaker wires and their connections. If they cross this to can cause protection mode.
  5. This is a 4 Ohm amp, are your speakers 4 ohm or lower> If not then you may be running to low of a load to your amplifier.
  6. I always remove everything from the amp first and power it on and then add wires and see where which connection throws the amp into power mode.
  7. Check the fuse as well but if the LED is on chances are your fuse is good.
  8. If you check all of the items I listed and the amp still goes into protect mode then your amp is bad.

Regards, Tony

May 05, 2011 | Lanzar MNX250 2Channel Car Amp

1 Answer

We were running a small show on the system, it was not loud. Throughout the night the protect button came on, but then we made some adjustments and restarted the system. Then it went into protect mode and...


Yes, take it to a repair shop.

You have a failure either in the power supply or one of the power amps. There is likely to be burned component(s) that are not user serviceable.

These things are a bear to work on... Mine failed again and I dread having to work on it.

The protect monitors power supply current drain of the switcher and the power amp balance.

DO NOT USE IT till it is repaired. Continued use or fuse replacement will likely do additional damage.

Apr 29, 2010 | Lectrosonics FENDER PD-250 PASSPORT SYSTEM...

1 Answer

Jbl am in protect mode


if it goes in protect mode means ur amp is turn up to high or it is over heating so it protectn it from fryn ur amp try to adjust it down

Jul 12, 2009 | JBL BP1200.1 Car Audio Amplifier

1 Answer

My amp turns on and off


Sounds like there could be a short somewhere. Check to make sure that there aren't any (exposed/bare) wires touching each other or if there is a bare spot of wire touching something metal. Check both ends of all the wires. A speaker wire may have come lose and is shorting out against the frame or some other place. Usually if it goes straight into protection mode or you're popping fuses you have a short somewhere. I assume the capacitor you installed is somewhere on the power line, which would be for helping with
noise. You can also try disconnecting your amp from your stereo and see what happens but leave the speakers connected, you don't want to run the amp with out a load on it (the speakers). If your amp doesn't go into protection mode when the stereo is disconnected, then you have a problem with the stereo and not the amp, assuming you already checked for any possible shorts first.

Jun 15, 2008 | Pyramid PB1236GX Car Audio Amplifier

1 Answer

Sony STR DB-930 Receiver jumping into protector mode


I went through the amp/receiver and used small star washers on all the grounding screws I could find including the one securing the transformer, cleaned dust off all circuit boards, checked output transistors and fuses, all OK.

Re Assembled unit and it worked OK.

I will buy a fan and fan it to avoid sourcing heatsinks for the previusly suggested IC's.

Thanks for the technical help, sure solved my problem.

Regards

Darryl.

Mar 07, 2008 | Sony STR-DB930 Receiver

2 Answers

DAB2204


try turning down the volume level on the power amp.
And see if that works.

Dec 27, 2007 | Digital Audio 840 WATTS 2, CHANNEL HIGH...

1 Answer

Amp not working correctly goes into protection


Disconnect the speaker wires from the amplifier and see if it still goes into protection mode. If it still goes into protect with the speakers disconnected, there's a problem with the amp; if not, you may have a blown speaker or a shorted speaker wire.

Feb 22, 2007 | Legacy LA2098 Car Audio Amplifier

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