Question about Technics SUV500 2-Channel Amplifier

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Cicuits Protection when the amp is powered up for a few minutes with music playing the amp 's circuit protection cuts in ?

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Re: Cicuits Protection

Check speakers impedance with a tester, run the amplifier without speakers, with the speakers switch on, if the amplifier not shut down the problem is the speakers

Posted on Apr 20, 2008

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Re: Cicuits Protection

You have a power supply circuit problem,you need a qualified serviceman near you.

Posted on Feb 18, 2007

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Where do I start testing?

I would check if the amplifier somewhere gets hot. Most likely with a certain temp the amplifier will go into protection, Avoiding damage to the vital parts.
When you can find the place where it becomes hot, perhaps you can see if a transistor, or am integrated circuit is not correctly fastened. Before fastening it, perhaps you should apply cooling paste. (Like you use between a microprocessor and the van)

Perhaps it is only running hot, because you want to much power?
To loud.

Jul 25, 2014 | AudioSource AMP-100 2-Channel Amplifier

1 Answer

My NAD C326BEE amp goes into protection mode at moderate volume

The protection only should come on, when the power amplifier has to give more current than it can deliver. (electronic fuse)
If in the music is a lot of subsonic, sound, so low you can't hear and your speakers can't produce, this could cause the problem. Normal CD players will cut of all frequencies beneath 20 Hz, but it could be your PC is giving everything from 1 Hz and above.
I would certainly try to play some music over a CD player and check if that would solve your problem. Not sure if that works, what you could do to suppress the sub sonic in the computer music.

Aug 22, 2012 | NAD C326BEE Amplifier

1 Answer

Hi, sometimes while playing sound suddenly goes off. After cutting mains and restoring of mains, the amplifier starts working properly. I have checked cables and all. thanks

it is possible that you have eitherr a power realted issue or a protection circuit in acttion. First of all takeou the plugs and ccheck if there is corrosion in the pins, burn marks. If so clean them using a good emery paper,If so do not use the outlet that you are presently using. Otherwise If this seems OK, then you must check your speaker connections and check to find if the amp is over heating when it cuts off. Open the set top coverr and maek a good cleaning and tightening of the cords and boards while checking for burning smell. If you are able to access the main board, try to check for dry soldering bad joints in power and output cicuits. Use a good iron to do the resoldering and check again. If set is cutting off at high volume or high bass, then reduce load to confirm. If so you will have to check for distortion or wrong biasing in the output stages. Hope you check this out. Good day

Jul 18, 2010 | Krell KAV400Xi Amplifier

1 Answer

My sc-ch900 cuts out after a minutes playing. Is

did u play it real loud? if not, probably not. in most over load problems the system shuts down pretty fast. it will not take minutes if it has an over load protection. it is pretty hard to tell exactly what is wrong with that kind of sophisticated systems unless we take a look inside. it is probably bad power supply within the system. like i always suggest, if warranty covers-replace it. otherwise u have to get it fixed.

Mar 12, 2010 | Technics Amplifiers & Preamps

1 Answer

Power seems to cut in and out - it 'clicks'and a second red light comes on - most of the time just one red light is on. Thanks

The click you hear is most likely the speaker protection circuit relay due to the protection circuits being triggered. In the event of a dc voltage appearing across the speakers the protection circuit isolates the the speaker terminals from the output stage.
Dry joints on the relay is not uncommon and causes false triggering. Check both pos' and neg' supplies are present at the output transistors / ic. Connect a dc volt meter across the speaker output terminals if a voltage of more than a few millivolts appears just before relay clicks then check the ouput stage for dry joints, leaky transistors and resistors having increased in value.

Mar 05, 2010 | Amplifiers & Preamps

1 Answer

Protection circuit operates when CD is played

are you playing a cd which you recorded at a higher level? if so, you are overdriving the amp. you may want to check some of the setup menu items which could contribute to this. it also could be caused by a driver or component in a speaker which is getting maxxed out, which is easier to do with the cd source than any other in some cases. denon protection circuits are quite sensitive. good luck

Feb 11, 2010 | Denon Amplifiers & Preamps

1 Answer

Crown xti2000 cuts off

The protection circuit is most likely shutting down the amp because of heat. When the amp shuts down, does it feel hot? If not, then further investigation into the protection circuit will be necessary. This is not a problem that is likely to be diagnosed remotely as measurements will be required internally once the amp has stopped working. Check the sepaker wires for shorts that will cause the amp to work extra hard (generating extra heat). Other than that, you will need a servicer to diagnose further.


Nov 23, 2008 | Crown XTi 2000 2-Channel Amplifier

2 Answers

Sonamp 260 cuts out

Normally this denotes a protect condition. Remove the speaker wires from the back of the amp and see if the green light stays on. If this fixes the problem, then there is a short circuit in your wires, speaker level volume control or speakers. The amp sees the short and goes into protect. After a couple seconds it closes the connection again and if the short is still present it goes back into protect.

Aug 03, 2008 | Sonance Sonamp 260 MKII 2-Channel...

1 Answer

Protection mode overuse

Flashing protection LED indicates there is problem with circuit. Have unit serviced

May 10, 2008 | Cambridge Audio Azur 640A Amplifier

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