Question about Alpine MRD-M301 Car Audio Amplifier

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Negative speaker output touched chasis of amp.

Now amp is always in protect mode, reading CURR on display. With or withourt RCAs connected. I do not smell any burnt components. I also cannot visually notice any burnt or defective parts inside amp. What could this be, and how can I fix it MYSELF. I am pretty good with a soldering iron!

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  • Curtis Craft
    Curtis Craft Dec 16, 2007

    thanks that helped

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If it reads current, that means protect mode. Unhook all wiring for a few minutes then connect them. it should start working. If the polarity is wrong, it overheats, or impedance is too low (under 2 ohms); the amp will display CURR until the problem is fixed. I'm sure it's not blown.Good luck.....Log in to crutchfields site and type 500mrdm301 in the search box/ that will give you the amp and you can download the pdf for the owners manual.

Posted on Jan 25, 2009

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Check all fuses on the unit, pull them all.
look for a way of resetting the amp.

LEAVE THE MAIN FUSE OUT TILL THE INSTALL IS COMPLETE!!!

that way you wont short a screw driver across the terminals on to the chasis.

Posted on Dec 15, 2007

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NAD M3 power light turns red immediately and PROTECT message displays. Amp keeps functioning but volume control doesn't work up or down.


Hello
Check the connection to speaker with this amp, for any short or any other fault. disconnect the outputs, ie, speakers from the amp, and switch it On, and see the protect display comes or not. If it comes, the fault is internal and the set need service.
Your M3 dual Mono integrated amp, is of high output power and its outputs are protected against any overload or short circuit. If the system detect any among this condition specified above, it will show protect mode display.
Never load this amp, as protection display is there, as it may damage the speaker or its internal power amplifier section circuits, may cause more money to get it repaired. OK.

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My Harmon kardon is stuck in protect mode


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. Hopefully you have warranty. Double check all connections .A thumbs up would be greatly appreciated if this answer is helpful to you. Worth fixing.

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Installed lanzar 266 amp yesterday it went in protect mode on a song and now everytime i turn it on it is in protect mode


most commonly that means that somewhere there was an arc in the electrical either the pos or neg going into the amp or rcas or its the speaker wire from the amp to to the sub itself look especially for little wires touching opposit polarity wire (like a little +wire has moved and touched a - wire)

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Amp went to protect mode and will not reset to green.


Be sure the rca's are not getting severly pinched or worse you drilled a screw into them.

Second make sure your connecting the RCA's to the
1. OUTPUT of the radio
2. INPUT of the amp

if you connect any other way its wrong and could damage both radio and amp especially you screw into the RCA's your sending 12 AC Volts to ground.

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Let our Experts solve your "My amp lights up like normal then protection light red comes on and turns the amp off resets and tries again. What would be my course of action


disconnect all wires (including RCAs)
reconnect positive, ground, and remote.
Turn amplifier (car) on.
If it goes into protect mode again - there is an internal fault that requires professional repair.
If the amplifier idles as normal - turn off the car. Plug in RCAs & re-try
Failure? - replace RCAs as they may be pinched or faulty.

Lastly if all connections are made and amplifier idles without going into protection - you need to concentrate on your load (subwoofers).
Be sure they are wired properly into a resistance that amplifier is rated.
The lowest impedence that amplifier is rated is 2ohm.
That is possible with (2) 4 ohm subwoofers wired in parallel....
(4) 8 ohm subwoofers wires in parallel...
(1) Quad 1 ohm subwoofer...
or (1) Dual 4 ohm voicecoil subwoofer.

Any other combination will result in an impedence too low for your amplifier.

Next:
Using an OhmMeter (Digital multimeter set to Ohms 20) test each voicecoil against its advertised resistance. It should be CLOSE +/- .5 Ohms.

Any other reading means the voicecoil is blown.


Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

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My alpine amp displays CURR and nothing coms out!This happened after i was screwing the speaker wire in and I touched the amps chasis and it made a spark. I opened it up I did not see anything wrong with...


According to an Alpine owner's manual, for that type of amp, you should be able to remove power from the amp, then reconnect power to reset the error. If it doesn't reset, either there is another short in the wiring or the amp has permanent damage and needs repair.

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have you disconnected all inputs and outputs on amp and retried starting it power only? if so your amp has an internal solder bridge and must be repaired by authorized repair center. Repair it or replace it at wholesale price from www.godspeedaudioheaven.com

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When the protect mode is activated,always be the audio amplifiers IC's damaged you gotta change them.

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Usually, protect mode is enabled when the speaker output wiring has shorted together or is touching ground/+12V. I would verify that none of the speaker wiring has come loose.

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1 Answer

Protection Light Is Coming On


You say the protection mode only occurs when you plug the RCA's in. Does it have to be both RCAs or just one?

The other end of the RCA cable is plugged into the HU?

It possible the RCAs have too much DC voltage on them, causing the amp to go into protection.

Is there a short in the RCA cable?

I would definitely check out the RCA connection at the back of the HU, as it sounds like there could be other issues there. Make sure the RCA connectors aren't touching any other metal (especially +12V).

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