Question about Alpine MRP-T220 Car Audio Amplifier

2 Answers

Amp keep blowing the 20amp fuse

As soon as you put power to the amp it blows the fuse.
This happens even if no speakers are connected.
Any idea?

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  • dadidas May 06, 2008

    I have tried it in 2 different cars with 2 different sets of wires,

    so am pretty sure the problem is inside.

    I will take the board out and see if there is anything obvious.

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2 Answers

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There seems to be a short circuit inside your amplifier. It could be one of the amplifier mosfer/transistors or a diode that is connected nearby the power input.

Posted on May 06, 2008

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There is possibly a damaged MOSFET or smaller transistor inside the amp they are pretty easy to locate and takes a little electronics knowledge to replace... also how are you connecting the remote power on for the amp? Make sure to check both ends of power and grounds make sure they are secure and check for wire chafing to make sure your power cable isn't arcing on the frame.Also shake the amp around to see if you hear anything inside rattling around... something coulda fallen inside or came loose.

I'd connect the AMP outside the vehicle to a 12 volt power source and see if it still blows outside your vehicle... could easily be an improper installation.

Posted on May 06, 2008

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2 Answers

Amp keeps blowing fuses


Blowing fuses, was caused by many thing.
Short of rectifier,resistor,elco,tube heater,tube pin, and also trafo itself (primary or secondary winding). It must check step by step.
CAUTION :
THIS IS HIGH VOLTAGE AREA.
RISK OF ELECTRIC SHOCK THAT CAN KILL.
DON'T DO THIS IF YOU ARE NOT TECHNICIAN OR NOT FAMILIAR WITH VACUM TUBE CIRCUIT. THE CIRCUIT MAY STILL CONTAINS ELECTRIC SHOCK EVEN IF IF THE AMP IS NOT POWER PLUGGED.


The simple steps (see picture) are:
  1. Disconnect all connection from secondary of power trafo (PLV,PDCH,PACH and PHV).
    Power ON the amp. If fuse is not blowing,trafo is good.
  2. Power OFF the amp. Unplug the cord.
    Connect PLV1-PLV2-PLV3 (this are Bias voltage,+/-15VDC and Backlight PCB voltage) to power trafo.Power ON the amp. If fuse is not blowing,PLV circuit is good.If fuse blowing,there are parts is damage (dioda,elco,7815/7915,resistor) in this PLV circuit.
  3. If step 2 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV circuit stay connected,connect PDCH 1-2 and PACH 1-2 to power trafo. Power ON the amp.
    If fuse is not blowing,PDCH and PACH circuit is good and all tubes heater/filaments are lights after a few seconds.
    If fuse blowing,there are parts is damage (dioda,elco,tube heater pins) in this PDCH/PACH circuit.
  4. If step 3 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV,PDCH,PACH circuit stay connected,connect PHV 1-2 to power trafo.
    Power ON the amp. CAUTION: HIGH VOLTAGE AREA is ON.
    If fuse is not blowing,PHV circuit is good.
    If fuse blowing,there are parts is damage (dioda,elco,tube pins) in this PHV circuit.
.amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-0.jpg
Notes:
  • Steps had to be done sequentially from 1 to 4, not upside down.
  • If tube/heater pin is short,it can't be repair. The tube must be replacing.
  • PDCH circuit is voltage for V1-2-3-4 heater/filaments.
  • PACH circuit is voltage for V5-6-7 heater/filaments.
  • Always replace fuse with same type.

amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-1.jpg

Oct 02, 2015 | Peavey 6505 Plus 120W Guitar Amp Head

1 Answer

Why does my Definitive Pro Sub 1000 keep blowing fuses the second I put them in?


Sounds like the amp is shoot.
Never power on the amp without speaker connected.

May 24, 2014 | Definitive Audio Players & Recorders

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Fuel pump fuse keeps blowing on my 95 Crown Vic


Using a smaller fuse should make the problem happen more often.
A mechanic would unplug the pump harness at the tank and check the circuit for high resistance or a short to ground.
If nothing is found in the harness, I would suspect the pump in the tank.

Jul 19, 2012 | Ford Crown Victoria Cars & Trucks

2 Answers

What do you do when your amp keeps blowing fuses


First off which fuse is it? The inline fuse from the battery or the amplifiers power supply fuse? Blowing the main fuse from the battery is caused by either the load (your amp) drawing too much current or you have a short to ground somewhere. Maybe there is a tear in the 12Vdc line and it is shorting to the chassis of your car. If the amps power supply fuse is blowing as soon as it turns on your amp has a shorted power supply. This will require internal component changes by a technician. If it is blowing after operation at high volumes I would say change the impedance that the amp is driving. If you are at 2 ohm try to rewire your speakers for four ohm. (go from parallel to series wiring then bridge mono or operate the amp in stereo mode)

Feb 07, 2010 | Infinity Reference 1300a Car Audio...

1 Answer

I got an amp and as soon as i put the fuse in it blows even with the deck of all wiring is correct and i hear a thump from the subs when i put the fuse in, the subs work good on a diff amp


Sounds like the amp is blown. Is it the fuse at the amp that blows? or the one at your battery? disconnect the ground and power wires from the amp and check for continuity between the ground and power on the amp terminals. you should have no continuity, and if you do i would check for a shorted power supply mosfet. try disconnecting all speaker wires, rca's, and remote power and see if it still blows. If it does its a problem in the amp, probably blown mosfets.

Jun 30, 2009 | Car Audio & Video

1 Answer

Keeps blowing fuses!!!


HI ..PUT AN AMP METER IN LINE TO SEE WHAT THE AMP IS DRAWING..WHEN IT IS CRANKED UP ..IS 20 AMP WHAT IT CALL FOR ON THE AMP IF SO I WOULD NOT GO ANY HIGHER.....BUT IF YOU HAD JUST USED 20 AS A STARTING POINT FOR AN AMP-AGE...SOMETIMES IT IS BETTER THAT THE FUSES BLOW ONCE IN AWHILE THAN THE AMP...ALSO CHECK FOR A LOOSE GROUND.....GOOD LUCK

Jan 29, 2009 | Planet Audio VX2002 Car Audio Amplifier

1 Answer

AMp keeps blowing fuses


When any amp blows fuses, this indicates that something is drawing too much current. The most common cause are components in the output stage and driver stages that have become defective.

On the amp that is blowing the fuse with the volume being turned up, this means that the output stage is partially working. The short or over-draw of current must be in the output stage, or what is loading it. It is possible in this case that a crossover in a speaker unit is defective, and is drawing too much current. I have seen this with especially sub-woofer crossovers, and the driver itself. Subs pull a lot of current because of the amount of drive power required to have very strong bass sounds. Other than that, this still does not rule out the possibility of the problem being defective components in the amplifier.

Jerry G.

Apr 25, 2008 | Car Audio & Video

4 Answers

AMp keeps blowing fuses


http://www.howtodothings.com/electronics/how-to-fix-the-fuse-on-your-guitar-amplifier

Hi You can refer to my detailed solution above...if you still have issues please feel free to contact.

Thanks

Feb 15, 2007 | Kenwood KAC-7202 Car Audio Amplifier

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