Hi dears. My MTX power amp blow the fuses and 4 mosfets D522AN... Why tihs is hapened? Regards.

1.-check proper heat sink, or dissipation.
2.- check speaker impedance. Must match between amp and speakers.
3.-low power line on the house may cause low efficience work on the amp, overheat, and finally fuse protection.
4.- finally, check speaker wires. Thin cable overheat amp too.

HI,
If the fuse is blowing of then there is problem with the inverter stage of amplifier. There is an inverter stage in the amplifier to boost the 12V to + or - 30 to 40V normally. Its a switching circuit normally uses Mosfets and ferrite core transformer and a driving IC. If the mosfet is shot then the fuse will blow off immediately after power is connected.

Check on thing remove the REM connection and then connect the power. If the fuse blows the there is fault with the Mosfet Its short.
If the fuse blows only when you connect the REM then the amplifier stage is faulty.

Also check by disconnecting the speakers. if any of the speaker is faulty then there is a chance for fuse blow off.

Ajin

• No, this is far to powerful of an amp to use 8 gauge. Use 4 gauge copper stranded wire. Using stranded copper wire is best for performance. I recommend a 100amp fuse being ran inline no more than 6 inches off the positive battery terminal as well.
• You can use a 6 gauge copper stranded wire one one condition and that is if you use only a 4 Ohm speaker. Anything above that you need to go up to 4 gauge.

Regards, Tony

More likely to have shorted out MOSFET ( for the DC to boosted DC power supplies) and Output transistors (for the audio outputs) which are mounted on the heatsinks, you should see a bunch of 3-leg devices attached to the heatsink, very time comsuming to repair.

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When installing an amplifier of this size and current draw - the fuse is NOT ON THE AMPLIFIER.

This particular amplifier has a built in thermal shutdown protection only.

If the INLINE fuse is failing... only 2 things that would cause it....

1. Fuse rating too low - The current draw + wire resistance is greater than the fuse allows.

2. There is an immediate ground situation. There may be a screw though the power wire - the wire may be worn where it enters the firewall - or there may be a strand or 2 of wire jumpering from the Power terminal of the amplifier to the chassis (of the amplifier)

The recommended external fuse rating is 150A for this amplifier. Please be sure you are using the proper fuse for the amount of current draw this amplifier requires.

If there is an additional amplifier drawing from this feed - add the fuse rating of that amplifier to the INLINE fuse.

ALSO - be sure your wiring is of the proper gauge. I/0 wire is necessary in this instance - (or 2 runs of 4GA) as it has less resistance to the current. Utilizing an insufficient power wire will also lead to the INLINE fuse blowing.

If you have additional questions or concerns - feel free to ask.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

Hello opey_69a,

Here are the troubleshooting steps for fuses blowing.
1) Remove all wiring except ground, power and remote and see if the amp powers up without blowing the fuses. If it does, the problem is in the input cables or speaker wiring.
2) The use of loudspeaker impedances below the recommended minimums will cause the amp to draw excessive current - check.
3) A shorted or grounded RCA cable may cause the fuses to blow - check.
4) If an amplifier fuse blows continually, with only +12 volt, ground and remote leads connected, the amplifier is probably defective, most likely shorted output MOSFET's. In this case the amp needs professional repair or replacement.

Hope this helps.

It may be a mosfet in the power supply section that is blown. These parts are usually available from electronics part suppliers. Or it may be one of the amplifer transistors that is blown and it will also usually be available from parts suppliers. This fault is usually caused by battery voltage dropping to low so the amplifers output starts to clip and put D.C on the mosfets causing them to blow.

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.

could be bad mosfets or outputs, needs replace

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