Question about Alpine MRD-M501 Car Audio Amplifier

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Have no sound

My amp lights turn on but no sound. Does any one no how to turn off the safe mode

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Re: have no sound

More info needed. It's like asking how to completely disassemble a car and expecting us to do everything for you. Please take some time to do a bit of research on your part so that we can better assist you and not have to work hours to answer your question.

Posted on Nov 02, 2006

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Safe mode light is always on amp willmnot turn on

this is because this amp has been overheated and the power supply inside the amp can only go into safe mode. this is whats known as "burned" or severely overheated components inside the amp. this is caused by demanding more power than the amp can handle causing so much heat that the components literally melt and ground themselves out causing an instant short when you connect the amp.

May 10, 2011 | Lanzar MXA282 Car Audio Amplifier

1 Answer

I have 8 gauge power wire with 60a fuse (reccomended) but when i turn the power on, the light on the amp turns on, and then fades while blinking, which means it goes into safe mode. Could the 60a fuse...

Hi, the safe mode indicates the speaker impedance is too low. It doesn't reflect the power to the amp. Check the resistance of the speaker and wires with an ohmmeter and verify it is 2 ohms or greater. Can you tell me what speaker you have?

May 08, 2011 | Alpine MRP-M500 Car Audio Amplifier

1 Answer

My amp keeps going into some safe mode and red light blinks and stops base to my sub. I have it hooked up to 1 15.4 Orion HCCA.

The "safe mode" on your amp usually kicks in for two reasons - the ohm load on the sub is too low for the amp (presenting a "short" to the amp), or it's going into thermal protection because the amp is too hot. From your description, it sounds like there's a short in the wire, the sub's ohm load is too low, or the sub is partially blown.

If you have another sub or speaker, connect it to the amp's output and see if the amp still goes into protection mode. If the amp goes into protection with a known-good speaker, then there may be something wrong with the amp's power supplies. If the amp works properly with another speaker or sub, then I would check the sub that's causing it to short out.

You may also want to check whether or not the amp is over heating by just touching the amp when it goes into protection. If it's just warm, that should be ok - if it's hot, then it might be working too hard. In this case, you may need to check the input voltage (12-14VDC) and the size of the power and ground cables. If your ground isn't properly connected, it can cause weird problems like over heating, shorts, erratic behavior, etc...

Mar 04, 2010 | Orion HCCA-D5000 Car Audio Amplifier

1 Answer

My amp turns on but the sound goes in an out

yes you have a internal fault of the amp. the circuit that puts it into safe mode is bad and that is a very small chip on the board know as a op amp. needs to be repaired.

Jan 25, 2010 | Alpine MRV-F345 Car Audio Amplifier

1 Answer

Amp will not put out sound The red light comes on

yes you have a internal fault of the amp. the circuit that puts it into safe mode is bad and that is a very small chip on the board know as a op amp. needs to be repaired.

Dec 28, 2009 | Solid Audio Formula Series F2000 2-Channel...

1 Answer

My amp keeps going to safe mode.

It sounds like the voltage drop created by starting the vehicle is causing the amp to go into safe mode. Try starting the car before turning on the stereo system. Then turn on the stereo and see if it functions normally. If this is the case you can either live with it or possibly upgarde the amps power supply by adding a capacitor, larger battery and better cabling to the amp if necessary.

Aug 09, 2009 | Cadence Z8000 Car Audio Amplifier

1 Answer

My alpine pdx 1.1000 amp cuts out, the sub cuts off and the amp goes in safe mode but it does it before it even gets loud, the sub is a 2000W rms sub, why dos the amp go in to safe mode, i cant turn the...

Power is rated at 1000x1 @ 4ohm.
How many voice-coils does your speaker have? If more then one, are the coils wired in series or parallel? How many ohms are the coils? If you actuate the cone with your hand, do you hear any "scraping" sounds?
Assuming everything above is within range and or tests good, the amplifier more then likely has at least one failed output transistor. a DMM would be needed to check for shorts.

Jun 24, 2009 | Alpine PDX-1.1000 1000W x 1 Car Amplifier...

1 Answer

No sound is coming out

Hello christheline,

First make sure that the amp is powering up properly and that the input and subwoofer(s) are connected.

Check that the amp is not in "safe mode".

1. Press the MODE button.
Press the UP or DOWN button until “9” is displayed.
2. Press the ENT button.
3. Press the UP or DOWN button until “9-1” is displayed.
4. Press the ENT button.
5. Use the UP and DOWN buttons to turn safe mode ON.
6. Press the ENT button.

If this does not work, either the input from the head unit, the subwoofer(s), or the amp itself is probably defective.

Hope this helps.

May 28, 2009 | Alpine MRD-M300 Car Audio Amplifier

2 Answers

500.1 amp power lights blinks on and off

Protection mode; follow this link to get a manual for the amplifier:

Below information is from the manual:

Status Indicator Lights / Protection Circuitry
There are three status indicator lights on the top of the amplifier. These are as follows:1) "Power" (Green): lights to indicate that the amplifier is turned on and operating normally.
2) "Thermal" (Red): lights to indicate that the amplifier has exceeded its safe operating temperature, putting the amplifier into a self-protection mode, which reduces the power output of the amplifier. The red light will shut off and the amplifier will return to normal, full-power operating mode if the heat sink temperature drops back to a safe level.
3) "Low ω" (Amber): lights to indicate that the impedance of the speaker load connected to the amplifier is lower than the optimum impedance load range for the amplifier. When this light is on, a protection circuit engages and reduces the power output of the amplifier. The amber indicator will also light when a short-circuit is detected in the speaker wiring (this can be a short between the positive and negative speaker wires or between either speaker wire and the vehicle chassis).
There is only one condition that will shut down an undamaged 500/1v2 completely… If battery voltage drops below 10 volts, the entire amplifier will shut itself off. The green "Power" indicator on the top of the amplifier will turn off when this occurs. The amplifier will turn back on when voltage climbs back above 10 volts. This may happen in a rapid cycle when bass-heavy program material causes a weak charging system to dip below 10 volts momentarily. If this is happening in your system, have your charging system inspected to make sure it is working properly.
For information on troubleshooting this amplifier, refer to Appendix E (page 21).

Jun 25, 2008 | Jl Audio E1200 Car Audio Amplifier

2 Answers

LED Light is on, but no sound from sub at all.. Have double backed on all wires but still nothing! HELP!!

if you change amps and it goes on protection the speakers are blown causing the amp to protect try changing speakers

Mar 24, 2008 | Car Amplifiers

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