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Amplifier no sound blowing fuses

Amplifier won't play any sound. Fuses are blown.

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When a fuse blows it means an overload in either the power supply or more likely the main amp section. The cause is a shorted transistor or IC. Chances are that the devices (one, more or all) attached to a big heat sink have failed.

Posted on Nov 21, 2013

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Posted on Jan 02, 2017

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robotek
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SOURCE: Denon PMA 520 fuse blown

Check that you are replacing the fuse with the correct type first. Fuses marked with a T following the rating are "slo blo" fuses and if a fast blow is used instead, it will fail again at turn on. Otherwise, the amp will have a fault occurring, probably in the output stages. You should refer this type of fault to a repair guy that knows HiFi. as this sort of repair needs an experienced touch.

Posted on Jan 11, 2008

  • 4 Answers

SOURCE: my old mission cyrus amplifier has blown both

It is common for manufactuers to label the fuses on the circuit board as to their values. If they are not labeled there you can try contacting the manufactuer or looking in your manual. You can tell if they are slow or fast blow by the internal wire, if its thin and straight its a fast blow, if its thicker and spiraled its slow blow.

Posted on Jun 06, 2009

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SOURCE: nad 304 amplifier no output, relais not willing to

The 2 BIAS resistors of 47kohm, R333 R334, replaced with new 1W resistors. 1 resistor was totally open and 1 resistor was 55k.

It were 1/2W resistors, replaced them with 1W resistors. Very low cost repair for a High End amplifier. Should live for another 10 years.

Regards
Marc

Posted on Jan 08, 2010

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Adcom GFA 7500 problems


My right channel went out on my GFA 7500 and the problem was TWO blown internal fuses. Each amplifier inside the GFA 7500 has two fuses. In order to get to the fuses you must first take the top of the amplifier off by removing the screws using an allen wrench. Then put the top back on.Turn the amplifier over and remove most of the screws from the bottom to access the fuses in the bottom of the amplifier. There are two different size allen wrenches on the bottom. Be careful to not drop a screw inside the amp and make sure you line up the screw holes that hold the amps using a small screw driver to push the amps into position. I replaced all the fuses on the top and the bottom. AdCom sells the fuses on their site.

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1 Answer

Amplifier do not have sound. E-mail: rigo11us@yahoo.com


You may have blown the inline fuses for output sound. Amps have alot of fuses under the hood. take the amp cover off and check all fuses are not blown / wire broke inside fuse. Some fuses are hidden under circuit boards on some amps, check everywhere possible to check all fuses. If all fuses are fine and no broken wires inside them, you may have loose connection where your speaker wire ports are inside the amp. Check they arent black or loose. if they black they are blown as there usually soldered (a silver colour)

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make sure that you have installed a wire fuse inbetween your battery and your amplifier that is the most common reason for blown fuses. without that extra fuse your amp is getting a non limited amount of power from the battery.

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Playing it loud for about 20 minutes it suddenly fell silent. Power is fine as is fuse. What has blown?


Hi, even though the mains fuse on back of amplifier is fine, the speaker fuses might have blown.
Now really you need to take it to get repaired but if you know someone who has electronics knowledge they could look inside the amplifier to check the speaker output fuses.
I wouldn't want to advise you to do it as there are dangerouse voltages inside the amplifier.
If you need more help, I will guide you.

Regards - Anthony

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1 Answer

Blown fuses


I agree with the last answer- your amp has built in fuses that should be rated at 30 amperes each which should be sufficient as the amp only pulls 60 amperes at full power-however you may want to upgrade your power /ground wires to a good 4 gauge set if you dont already have it set up like that-throw an 80-100 amp fuse up front by the battery in case your running another amp for mids and highs just to cover the current draw of the amps combined. If the amp is still blowing fuses after that check to make sure that your subs are wired to no lower than a 2 ohm load as the amp is only stable to 2 ohms.

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1 Answer

It wont hold fuse blow evertime


if the fuses are blowing as soon as it comes on the amp is bad, if the amp is actually playing but popping the fuses after a lil bit of playing make sure your subs are wired to the proper impedence for the amplifier if the amp is pulling too much current due to the subs being wired at too low of a ohm rating for the amp.

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1 Answer

Blown fuses


the reason could be because the energy is not well installated or your speaker wires are toucing somehow.

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1 Answer

Denon PMA 520 fuse blown


Check that you are replacing the fuse with the correct type first. Fuses marked with a T following the rating are "slo blo" fuses and if a fast blow is used instead, it will fail again at turn on. Otherwise, the amp will have a fault occurring, probably in the output stages. You should refer this type of fault to a repair guy that knows HiFi. as this sort of repair needs an experienced touch.

Jan 05, 2008 | Audio Players & Recorders

1 Answer

Car Amp keeps blowing fuses


The reason why fuses blow is that the current is too much. Is the fuse rating according to the specs ? If yes then ... One or more output power transistor (or audio power IC) may be shorted. have it checked before replacing another fuse as this might cause more damage.

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