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Technic amp blowing a fuse on one speaker channel

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Disconnect the speaker line to that channel.see if it pops the fuse without being hooked up. If it does,the amp is the problem. If it doesn't, you may have either a shorted speaker line or speaker.

Posted on Sep 24, 2008

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Can you have just 2 channel by hooking up to right & left front speaker posts on 5.1 surround

short If you hook more than one speaker up to a single channel, it will lower the impedence and will damage the amp. You can hook up multiple speakers by using a speaker switch box between the speakers and the amp. This will match the impedence and should keep the amp from blowing.

Dec 21, 2014 | Panasonic Technics SA-G76 AV Control...

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If what you say is true, you should be fine.
Where you get into trouble is having an amp of higher power than your speakers. That means you will likely blow your speakers.

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My marantz pm 7200 blows fuse at random on the amp stage. Lights remain on and no obvious noise from speakers, just audio cuts out when 3.15A fuse fails. Any ideas, not a speaker issue. Thanks

There are only a couple of other things that this could be. One is that you are over driving the amp. If you are sending a signal into it that is too high then it will blow the fuse. The other is that something is over heating and causing the component to fail and that blows the fuse. It still could be the speakers too. There could be a bad cross over in the speakers or there could be a thermal issue with them or the voice coil could be bad and when it gets hot it is shorting out.

Oct 30, 2014 | Audio & Video Receivers

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Can a technics su v670 be wired up with a technics power amp a800s mk II?? what im thinking it doubles up on the power the wattage to each channels? am i rite? the suv 670 is 90 watts per channel and the...

"im no proffetional at this". Really?

If you looked at the manuals for either product you would NEVER find a recommendation to use one amplifier's speaker input to drive the LINE LEVEL (very small) input on another amplifier. Speaker outputs are for driving speakers or amplifiers designed to accept speaker-level input (like some self-powered subwoofers). In no case is the power of the originating amplifer BOOSTING the power of the driven one.

You should do some reading on how amplifiers work before you blow something up and come asking for advice on how to resolve it.

Sep 02, 2011 | Audio & Video Receivers

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I have a Technics SA - DX750 Amp Everytime I turn it on I get an error message F70 and then it requests that I turn the power off. This is all it does now, so sound. How do I solve this issue I have...


The F70 error certainly indicates a blown fuse inside.
The real problem is why the fuse is blown: there are only two possible reasons
1. there is a short circuit on the output (lines or speakers)
2. you have a blown output transistor (and that means some work and skills to replace).

To be sure, please change the fuse with a same rated fuse (buy more than one because it can blow again). Disconnect the speakers and turn the amp on. If the fuse blows again, it is sure something wrong with the output transistors. If the fuse remains ok, then please check all the wiring to the speakers.

Hope it helped.



Aug 21, 2011 | Technics SA-DX950 Receiver

1 Answer

Both 8 amp fuses blown

Disconnect the speakers and replace the fuses with the proper specs ONE time and hope. Amps only have so many lives. If it blows them again take it to a tech to get fixed.

Otherwise, if it survived evaluate what you know about the event that blew the fuses and try not to repeat it.

Attach ONE speaker to one channel and see how that works out; then the other. You may have just blown the speakers or they may cause the fuses to blow again.

Jan 16, 2011 | Sony STR-DE825 Receiver

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check inside to see if you have a blown fuse on the left channel

May 27, 2009 | Technics Audio & Video Receivers

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Sounds like the power transistor(s) on that channel burned out. Needs service.

May 04, 2009 | Audio & Video Receivers

1 Answer

Amp not responding after bi amplifying speakers. I forgot to remove connecting bars from back of one of the speakers. What could have happened and is it likely to an expensive repair?

Oh boy.......well, looks like you tied the output of one amp to the output of another amp. Kind of like tying the front bumpers of 2 cars together and having the cars push against each other. The stronger car wins and crushes the weaker car.

Unplug the amp. Check the fuse. If its blown, Unplug all your cables to the suspect amp, and try a new fuse 20 % SMALLER than the original. If the amp fires up, then take a voltmeter and check for DC VOLTAGE between the positive speaker connection and the negative speaker connection. Do this with both channels. If there is more than 0.05 volts of DC present for any one channel, while the power is on and there is no signal going into the amp, then you have problems best looked at by a repair shop.

If the fuse blows immediately, you have problems for a repair shop.

Repeat the procedure with both amps.

Best of luck......Rob

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Did you ever find the solution to the left channel issue? I have the same problem with mine.

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