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Very noisy power transformer

Hi all I have the above reciever with about 4 years. I have noticed lately, that when output levels are low as in quiet speech, I can hear a very irritating hum from the transformer( 230v to 6v). It appears to be getting worse. Is it possible to replace the power system with a better one or are their other possible solutions. Regards Dom

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Re: Very noisy power transformer

Most transformers are bolted but some are just screwed you could probably check to see if teghtening is needed.

Posted on Aug 09, 2007

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Kenwood vr606 reciever shutting off subwoofer and centre speaker simultaneously after few minutes/seconds of powering on. WHat's the cause?

The receiver's out put sections are grouped in pairs. Front left and right in one output, rear left and right in second output, and center channel and sub output on the third. Sounds like a semiconductor or semiconductors have gone bad in the center & sub output.

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Keeping your SA-DA8 cool

When I first bought this I noticed that it runs very hot even on low volume levels. I took it in for repair and told the tech that the fan didn't come on even when hot. He said "works as designed - the fan is output-power-driven, not temperature driven."

Wishing to prolong the life of ma SA-DA8, I used an old computer power supply and muffin fan. Plugged the PS into the controlled AC output of the amp, and the fan into the PS. Jumpered the "power-on" pins of the PS. Laid the fan on top of the amp, padded with some foam tape, and it now stays a lot cooler (and the fan is very quiet, though not silent.)

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Denon dra 25 no power

If you have a multi meter then unpug from mains supply.With meter
on "ohms" range check the following:-
Fuse F501 (and F502 if mult-voltage model)
yellow to white on mains transformer this should show some resistance.If you have a mult-voltage model check
brown to gray and orange to white. Both should show some resistance, if not your mains transformer has an open circuit primary winding.....

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How do i connect a sub wooferto my reciever

I own 2 of these Pioneer VSX-D903S units.

The only way to hook a powered subwoofer up to a VSX-D903S is if your subwoofer is equipped with amplified/speaker level terminals on the back, in addition to the line-level input. If you only have a line-level input, do not attempt to hook it up to this receiver.

If you're lucky, and have speaker-level inputs on your powered subwoofer, you would use the amplified terminals (connect to B-channel on the receiver). DO NOT connect anything to the line-level connection.

Alternatively, you could build two unpowered subwoofers, then set the receiver's Impedance switch to LOW, then connect one enclosure to each of the "B-channel" outputs. Connect your regular left and right speakers to their corresponding "A-channel" outputs. [Impedance range: 4 Ohm minimum, 16 Ohm Maximum]

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Hi. I have just connected my Bose Acoustimass 6 series III speakers. When I run a MCACC test, the display shows 'noisy' and there is no error message. If I run it again it stops and shows just noisy after...

Either your ambient noise level is too high for the test, or you need to increase the volume for the test tones.

For any such audio calibration testing your ambient noise level should be as quiet as possible, preferably below the measurable level of an SPL meter...usually 50dB for most models.

Dec 12, 2010 | Pioneer VSX-818V-K Receiver

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Reciever Shuts Off

chances are the speakers are the problem. try disconnecting the speakers and turn up to the level where it cuts out,if it does not cut out chances are a defective speaker or speakers,usally midrange or tweeter

Apr 10, 2010 | Pioneer SX-315

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Reciever turns itself off

try cleaning it out, get all the dust out of it if not , you may have some screwed up capacitors or transformer

Jan 02, 2009 | Yamaha RX-V757 Receiver

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I have a cambridge audio A300 V2.0 amplifier that wont power up. i've checked for power at the switch and there is power and i've checked on the main board at the fuses but there is no power there, the...

Hi there get a multimeter place across mains input on transformer,FIRSTLY DISCONNECT AMP FROM MAINS,set your meter to contiuity ,if good you should get a low ohms reading (resistance),then check the secondaries (output of transformer) either 3 wires or four going into amp board..if readings acroos all wires are low ohms then transformer is good if one is open ,transformer has had it ...hope this helps

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Nakamichi AV-10 loud thud from subwoofer

I don't know the design of this reciever, and do not have any schematics or engineering information to know the design.

This is a general comment:
In many of these recievers at this level they don't have very good muting designed in to their system. When switching sources, the audio is not being muted.

This is a theory of why the noise is not on the main speakers, but present on the sub woofer. Because the switching noise is of very low frequency, this is why the sub woofer is making noise. The main speakers lack the low frequency sensitivity that the sub woofer has. This is one way of looking at it. It is also possible that there is muting for the main speakers, and none for the sub woofer.

If the reciever does have muting in to its design that is supposed to mute when switching modes, then there is an obvious defect. When a source is switched, or a mode is changed, the output would mute for the duration of the switching interval. This is usually for a period of about 100 ms.

Your best bet is to contact the service rep for nakamichi and ask the question there.

I have serviced many recievers made by other manufactures. The higher end models all had muting in their design. This way, the output was muted when the source was changed, and when the reciever was turned off or on.

Jerry G.

Apr 23, 2008 | Nakamichi AV-10 Receiver

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