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Repair service for AG1000 Zapco Amp.

Amp keeps blowing fuses when played at high vol. I have it bridged with three 10"speakers. it doesn't do it right away, it does it after a few minutes

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Is it blowing the three 30 amp on-board fuses?

To have 3 speakers bridged, each speaker must have at least a 12 ohm impedance (assuming that all speakers are connected in parallel). If you're running a load lower than 4 ohms (mono), the amp will likely fail.

The fuses don't blow right away because they are cold at first. As they heat up, they can blow more easily (even though the current draw hasn't increased).

Posted on Aug 10, 2008

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Keeping it as simple as possible, sounds to me like there is a fault in the wire itself, test the radio by using different speakers and wire.
There is also a fuse or 2 behind the radio (built in) and they sometimes blow, the sporadic working speaker can be a symptom of a slow-blow fuse going. Hope this helps..

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I installed a 400 watt zapco competition amp\ front speakers play ...back woofers don't?


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check all wires are connected.
push the mono or bridge buttons are off.

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My subwoofers cut out after 30 seconds of use but work fine during the 30 seconds...my fuses are all fine and i'm running thick wire with an 80 amp fuse connected off battery...I have a lanzar vibe286...


If it's only your subwoofers cutting out and your speakers are still playing and all, try turning gain down on sub amp and see if that fixes it. I know if I crank my amp too high it kicks itself off to try to keep itself from blowing.

Aug 21, 2011 | Car Audio & Video

1 Answer

I have a zapco refrence 750.2 has no sound output when bridged but works fine when i run a speaker to each channel. any ideas on whats wrong?


check your settings on your stereo and the amp make sure you have changed to 1 ohm on the amlifier for a briged connection to a subwoofer and change from lpf to hpf on the amp there should be a switch.

Jun 07, 2010 | Zapco Reference 750 Car Audio Amplifier

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I have a dual XIA3145 580 watt amp that keeps blowing fuses


Generally, this indicates that there's at least one shorted output transistor.

Disconnect all speaker wires from the 'amplifier's speaker terminals' and disconnect RCA/signal cables from the amp. If it powers up normally, the speakers/wiring need to be checked. If it still blows the fuses, the amp almost certainly has shorted output transistors and will need to be repaired.

I'd recommend using two 10 amp fuses. The amp will power up with 10 amp fuses if there is no problem. If there is a problem, there's less of a chance of doing more damage by using the 10 amp fuses.

Let me know if you have any other questions.

babin_perry@yahoo.com

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1 Answer

My Pioneer GM 5300t amplifier blows fuses all of the time. It says to have two 30 watt fuses in it and thats what i have yet they still keep on blowing. My subwoofer is a Pioneer TS-W302R Twelve-Inch


Do not continue to put new fuses into the amp until you have figured out what is causing the problem. It will only increase the chances of causing more damage to the amplifier. I have been repairing car and home amplifiers for over 18 years and have a lot of experience with Pioneer amplifiers since I work at an authorized Pioneer service center.

This post will be long, but if you bear with me and forgive my long-winded answers you may be able to determain your problem even tho I really don't have enough information to figure it out yet. If not, we can get a little closer with more information.

Does the amplifier blow the fuse as soon as you connect power to it, or as soon as a new fuse is put into the amp? If so, the amplifier has some shorted components in the power supply. They have a bank of mosfet transistors in the power supply that sometimes get shorted when the amp has been pushed beyond it's ability, or just from a random part failure, or if the impedance of the speakers is too low. Your speaker is a 4 ohm speaker, if it is at a lower impedance than 3 ohms when measured with an ohm meter then it will need to be replaced. Even if it still plays, it is too low of a load for the amplifier and will cause more current to go thru the amp than what it was designed for. If you are using more than one speaker and have them bridged it will do the same thing. This amp is rated at 4 ohms bridged and 2 ohms per channel stereo. When you connect 2 speakers together and then bridge them they become a 2 ohm load which causes double the amount of current to flow thru the amp. It was not designed for that. Sometimes you can get these component failures just because there may be a solder joint or two inside the amplifier that is cracked and not making connection very well and this can cause components to short out because they are not operating at the proper voltage.

If your amp blows the fuse only after it has been turned on by your head unit, you will most likely have a blown channel. This would require the replacement of the output transistors of the bad channel as well as a few resistors and sometimes a few other parts.

If your amp will turn on and play for a while and then blow the fuse at higher volume levels or after a long time playing the problem can be either a bad speaker at a lower impedance or one or more components that are breaking down after they get hot or at a certain volume level.

As you can tell by now there are many reasons that an amplifier can blow the fuses, and figuring out just what the cause is can sometimes be a difficult task. It may require that you have a multimeter to do some checks on the amp and a power supply to power the amp on a bench so you can do those tests.

If this information has not helped you to determain the problem, please give me as much information as you can about how you are using the amp. How many speakers, where they are connected, at what point does the amp blow the fuse, and anything else that you can think of that may or may not be important. You never know what might give a better clue, too much information is always better than too little.

Thanks and good luck,

Dave

Nov 13, 2008 | Pioneer Car Audio & Video

1 Answer

AMP PROBLEM


check ur speakers they can cause the short with vol

Aug 13, 2008 | Audio Players & Recorders

1 Answer

MY AMPPLIFIER KEEPS BLOWING THE FUSES WHEN IT REACHES HIGH VOL. i HAVE IT BRIDGED WITH THREE 10" SPEAKERS.


LOOK THE SPEAKER AND IMPEDANCE WILL SAME TO OUTPUT OF AMPLIFIER OR LOOK FOR THE OTHER SPEAKER WHICH MORE IMPEDANCE,FOR EXAMPLE ,IF YOUR SPEAKER HAVE 4 OHM PUT THE SPEAKER IN SERIE FOR INCREASER THE IMPEDANCE,NEVER CHANGE THE FUSE FOR A TO HIGT.

Aug 10, 2008 | Car Audio & Video

1 Answer

Need help bridging


First check your gain it may be turned down. I personally dont bridge speakers. I put each speaker to its own channel on the amp.Make sure positive to positive and negative to negative. Try hookin up two speakers to the amp (not bridged) and turn your gain up around half way. Make sure you amp is switch to lowpass not high since most amps have crossovers built in now. The more speakers you have the less output from each speaker from one amp youll get.

Mar 02, 2008 | Kicker 01C8VR4 Car Subwoofer

2 Answers

Blowing fues


Are you sure you can put a 2 ohm load on this amp? Thats almost a complete short.

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