Question about Alpine MRD-M300 Car Audio Amplifier

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Led read out

On my amp there is the read out [b]e-3[/b] does any body know what this means and how to fix it.

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Re: led read out

E-3 The amplifier has been shut- down due to excessive current. Find and eliminate the cause of the excessive current, then turn the power off then back on from the remote control unit.

Posted on Oct 02, 2007

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There is a engine noise coming out from my speakers

(1) If you have an ohm meter check from neg terminal of battery to body of your car. It should be below 1 ohm. You should get the same reading between the amp neg terminal and the amp ground point. Check amp ground with the power off and the wire to the negative on the amp temporarily disconnected. Most cars have a braided uninsulated ground strap from the engine to the body or frame. In older cars this can break and it usually causes noise. Run a temp ground wire from the battery neg to the bat neg of your amp, if the noise goes away it's a ground issue for sure.
(2) Make sure the amp is well grounded ! The bolts that anchor the seats to the floor are one of the best ground points I know of.
(3) I've fixed a few amps that had an internal broken connection from the RCA's on the amp where they connect to the circuit board. This often happens from not having the amp bolted down and/or the RCA's getting hit or kicked. This will cause noise in the amp and requires taking the amp apart to fix it.

Apr 02, 2010 | Solid Audio Formula Series F4 4-Channel...

1 Answer

Shortage outputtransister on a kicker amp

How do you know its a output transistor?? You can open the amp and normlly the transistors are black with 3 legs and are normally bolted to the metal frame of the amp body as they get very hot and need to dissipate heat

Jun 23, 2009 | Kicker 06ZX750.1 Car Audio Amplifier

1 Answer

No LED power lights go on

the light with the power light(middle) is a blue/purple faint light try checking it out at night.The squiggy(as heat waves) will only light when the amps shuts down due to thermal protection(wait for it to cool). The bolt/yellow (short circuit) will light when there is an electrical overload in any of the wires(check +ve leads).

May 26, 2009 | MTX JackHammer JH202 Car Audio Amplifier

1 Answer

My 12v touched my ground last night and big spark happened

hello sound to me you may have burnt the main power wire to the body or other metal on the car ..
if i was you i would first check the fused if there not popped trace the wire from the battery to the amp see if you can find a burnt spot on the wire it should have a burnt spot on the ajasent part of the car.. untell you find that wire it will drain your battery "try to disconnect the amp wire from the battery recharge or jump start your car run your car for 20 mins" that should fix your car... if you have questions

Dec 20, 2008 | Solid Audio Formula Series F2000 2-Channel...

1 Answer

Audiobahn A1300HCT

not a problem! my audiobahn amp is still pounding also. those stupid leds will get you every time. What do the "experts" know.

Nov 11, 2008 | Car Amplifiers

1 Answer

My Jbl mono amp cuts out

It's likely that the amp has blown output transistors. To eliminate other possible problems, read through the following page:

Amp Going into Protection Mode

Let me know if you have any other questions.

Sep 14, 2008 | JBL GTO75.4 Car Audio Amplifier

1 Answer

Amp problem

Are you sure that the terminal isn't shorted to the case of the amp?

If it's not, the amp probably has a shorted output transistor.

If you want to repair it yourself, read through the following page. It explains the basics. Let me know if you have any questions.

Basic car amp repair primer

May 15, 2008 | Lightning Audio b2.250.1 Car Audio...

2 Answers

Amp reading E-03

the manual say it means that the speaker cord is shorted, or when the speaker output is in contact with the vehicle ground, i hope you can solve the problem with the info i just gave. good luck

Oct 04, 2006 | Kenwood Excelon KAC-X811D Car Audio...

20 Answers

Amp isn't putting out any sound

I have a Digital Audio model-DA2200W, Was listening to my tunes loud as always....then the subs quit bumpin...checked the subs cuz i thought i blew em...theyre fine...The power on the amp is still light and all..just no output..I opened it up to see if anything looked burnt looks it toast or can i fix it??

May 25, 2006 | Power Acoustik LT-980/2 Car Audio...

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