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Humming noise when amp is switched on, nothing pluged in, make - marshall g30r cd

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(Maybe) Seems like a problem with the reverb.Try opening it up (while un-plugged.) and try cleaning it out and checking there isn't any loose conections.

Posted on Nov 24, 2008

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A friend who blind has purchase this item some time ago 2007 I believe. We have a number problems with it. 1/ There is a hum of 50 c/s from the deck (I assume from Mains Transformer) when switched on and...


initially it sounds like a ground hum Something is touching ground inside. have you had it open? Look at the out put SSR's and follow them to the out put jacks. can you replace the jacks if need be? have you tried different cables? Does it do it if you use another deck other than the Onkyo. If all looks good and you think the Onkyo is the issue you may have bad IC SSR(s). Do you have the Tech ability to replace the outputs {solid state relays}?
Let us know what conclusions you have come up with. Other wise the sad part is a $110 dollar repair bill or $189 new amp/deck.

Jun 18, 2015 | Onkyo Audio & Video Receivers

1 Answer

Loud noise in speakers when switching on the receiver


The most common cause is the large capacitors in the power supply section. These are meant to filter the mains 50/60HZ hum out of the system. They will need to be replaced. You can confirm it's them by turning the volume control. If it doesn't affect the noise it will be them. If it does it will be something to do with the main amp. But unless the amp has a device in it that is connected with both channels, I can't see it being the main amp.

Mar 11, 2013 | Audio & Video Receivers

1 Answer

My Marshal Amp MG50DFX sound is very soft even tho the volume is on max. when I switch on the gains circuit and turn up the gains control there is louder sound, but a humming niose also, what can the...


First of all please check your cables because this kind of problems mainly arise due to cable errors.Second solution is check your input.For an example try a another input from a DVD player or etc.Third solution is ,you have to check your amp's mic volumes,please reduce your mic volume fully.Check you equalizer too,Please check and inform me if it doesn't work

Sep 15, 2011 | Audio & Video Receivers

1 Answer

I have a pioneer xc-is21v .basically 2000 audio model which has a vcd player and amp with woofer . i get a humming noise in the speaker but not in the headphones pluged in amp.this is a low ?60hz hum...


It may be that your headphones just don't handle that frequency well enough for you to notice it. A hum at this level could be due to earth(grounding) problems caused by a double earth. If you have other devices (tv, laptop, CD player, games console and the like), plugged into your amp try unplugging them one at a time to try and identify the source of this hum. (I get this occurring with hum on my television if I leave my laptop plugged into my audio system - which the TV is also connected to - even if the audio system and laptop are powered off).
If this resolves the problem you may need to insert a ground loop isolator device between your amp and the device that is causing the problem.
Although this one (on sale in the UK from Maplin) is designed for car audio systems I use it on a public address system to eliminate ground loop hum on the stage fold-back amps. http://www.maplin.co.uk/ground-loop-isolator-33172

Feb 25, 2011 | Pioneer Audio & Video Receivers

1 Answer

Is there an incompatibility between Onkyo 606 and KEF Wireless?


This is cycle hum place offending units away from each other or, isolate the power supplies and, re- check electrical circuit grounds

Jun 01, 2009 | Onkyo TX-SR606 Receiver

1 Answer

I have recently acquired a old Denon AVR3801 Home cinema Receiver. I have plugged it all up and switched it on, but although the system seems to work quite nicely, the amp itself makes a buzzing/humming...


The solution of leaving the thing on all the time would certainly work, but most of the time a buzzing sound inside a relatively robust audio amplifier is being caused by the huge transformer coil in the thing. Or wires that are in close proximity thereto.

In some ways, you're blessed that the buzzing is coming from the unit itself, and not through the loudspeakers.

Mar 06, 2009 | Denon AVR-3801 Receiver

2 Answers

Buzzing/vibration noise from ONYKO TX-SR506 unit


If the unit is under warranty, DO NOT open it up. Bring it in for an exchange or warranty service. Explain that the unit makes noise during use and it will be serviced. This could be as simple as a bad connection in the power supply area and you are hearing oscillations or it could be a defective power transformer. Either case will be covered under warranty so there should be no charge to you.

Keep us posted.

Dan

Feb 17, 2009 | Onkyo TX-SR506 Receiver

1 Answer

No sound/data from dvd or tv to receiver( marantz sr4001).. tuner works as does aux where i run my mp3 from. have just rehooked up main and center channels after repair. nothing else has changed ..just no...


You may have to tell the amp which type of input the dvd and tv are pluged into eg phono,optical or coax,you should find this in the amp set up menu.
hope this helps.
CABLE GUY.

Jun 30, 2008 | Marantz Audio & Video Receivers

1 Answer

No sound


This sounds like you need to reset the microprocessor - push the power button in while pluging the unit in

Apr 28, 2008 | Kenwood VR-357

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