Mine has also just started making this hum - 14 months after puirchase, so guarantee expired, of course - very annoying.
As I only use is as a tuner, using the Line Out to my sound system, with volume at minimum, I have solved it by plugging in some old earphones, hence taking the loudspeaker out of circuit.
Wouldn't help if I was using it as a standalone unit, of course.
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Re: Mains Hum on Ferguson FRG-R121D
Do you have a home theater line conditioning surge protector connected to this unit? like Monster or Panamax? What's probably happened is either a voltage spike or brownout has blown a resistor or diode in the unit, Or, Another circuit in your home has a loose connection and is creating a ground loop. It could be as simple as a light bulb getting ready to blow. It can be caused by just about any device in the house that "seems" to be working fine, yet it affects your receiver. No kidding. If your receiver has a three prong AC plug, you can go to Lowes or Home depot and get a two prong adapter for about a dollar, plug that in, if the noise dissapears, you know it's a ground loop. Also, check all your interconnect cables between sources like CD/DVD/etc. If they are the cheap cables that came with the products, throw them away! they are worthless and you may as well be listening to AM radio!. Good interconnects are actually more important than expensive electronics!. If you have ever gone to Wendy's and had a Frosty, try and **** it thru a straw, it doesn't work and your equipment is starving, let alone the cheap cables are notorious for noise and have NO ground shield to speak of. If you have good cables, awesome! make sure the ends are tight, analog rca ends have a way of loosening over time as well from expansion and contraction. Pull each one off and lightly twist the gold ends tight. I hope I haven't put you on overload! I have a tendancy of doing that, I'm just a perfectionist at this stuff. If you try all this and still have noise, post a comment and there are a few other things we can try before "off to the service shop" Hope this helps.
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If it is a constant low-pitched buzzing it is probably mains hum which can be difficult to eliminate.
There are two sorts of mains hum; conducted and radiated. Mains operated audio equipment suffers from this when the power supply smoothing is ineffective or when a hum loop has been inadvertently created. High gain preamplifiers with non-shorting inputs, high impedance peripherals and long leads make equipment more vulnerable.
Even battery powered equipment with a high gain can suffer from mains hum received like low frequency radio waves radiated from nearby mains operated equipment and supply wiring.
The hum is likely to be the sound of the ac mains electricity, either because the power supply smoothing has become ineffective in the amplifier or one or more of the audio peripherals or because the audio connections to the input of the amplifier have created a hum loop that is picking up the radiated energy from the mains supply and feeding it into the audio input.
Multiple grounding is often the reason for a hum loop. This is where an audio peripheral is not only grounded through the supply cable but is also grounded through the screened audio lead.
If the hum persists when there is no inputs connected the problem is almost certainly power supply related, otherwise it is likely to be a peripheral that has a faulty power supply or the culprit is a hum loop.
Hi-fi officianados have a number of tricks to deal with hum loops and google could lead you to these.
Grounding is an important safety consideration so appliances that are intended to be grounded must continue to be grounded but the loop could be broken by using special audio leads. The usual lead would use the screening as a conductor and so the screen must be connected both to the peripheral and to the amplifier.
A better lead uses an extra core conductor and the screen then becomes just a screen and is grounded only at the amplifier end and is not connected to the peripheral.
You may have an earth loop problem. This is caused by connect various equipment to different mains power outlets. Connect all the PCs, audio and speakers to a single mains power outlet, use a power board so they are connected to the one mains power outlet. I suggest you use a power board that has a built-in surge protection.
Replace the magnetron by the sounds of it. The hum gets louder a second or so into "Cooking", that would comply with the magnetron heaters coming on and working into a dead magnetron. It could be capacitor or diode of course.
I have an Akai 4000ds Mkii which had quiet but noticeable hum. I managed to fix it entirely but I had to remount the transformer in a different position and orientation, presumably to 'balance' the magnetic induction it caused in the chassis. I further reduced the hum by adding some steel sheet to the chassis. All this has to be done by trial and error using scrap steel so you need to be exceptionally careful about where the various mains tags are located. You may not be prepared to move so far away from the original design but I suspect your hum is caused by mains induction from the transformer shooting around the chassis. If these currents pass through the chassis anywhere near the playback heads, you are likely to get significant hum.
the tv is picking up a 60 cycle hum from the bond wire.they did not filter the main audio board.to fix it buy a 3 wire to 2 wire ac plug without the bond wire. plug it into the wall socket an it should fix the hum. it fixed mine an now no hum. fletchb321.
I had the same problem and solved it. Mine took about 10mins to turn on (constant buzzing and beating before this).
The problem is the 1000uf and the 220uf capacitors on one of the circuit boards near the front of the device. I replaced these with new ones and problem sorted.
So if you know what your doing, take it apart and solder in some new caps. If not...maybe get a new one!