Humming sound I installed a 400 watt amp and it was working for about10 seconds and then the sound went out and a loud humming/buzzing sound comes on as soon as the car is turned on. I think the amp may have overloaded the system. Any thoughts?

You have two options. First a faulty cartridge. Or a faulty pre-amp in the main amp.
You can find out if the cartridge (and amp) are playing up. By removing the connectors on the cartridge.
Then with the volume turned up to about half, with your finger, touch each one of the wires one at a time. It will not harm you at all. But you should hear a loud buzz on one wire on the right and a loud buzz on the left on another wire.
The two other wires will either produce a crackle, or a tiny buzz, or nothing at all.
If you do hear a loud buzz on two wires. The cartridge is faulty and needs replacing.
If you hear a slight buzz on them or weak sound. There is either a bad connection between the deck and amp. Or the pre-amp inside the deck which is only used by the record deck so will not effect any other function, is faulty.
You can remove the record deck connections to the amp and again with the amp on half full, touch the inputs with your finger. If you are not hearing a loud hum or buzz, the pre-amp is faulty. If you do the connectors are faulty.

I would check the caps on the power supply. They are rather large electrolytic capacitors that will look like they burst and/or leaking. When these die, the caps ground and the sub will make a loud buzzing sound. If you are handy with a soldering iron you can replace them yourself. Replace them with the same voltage or a little bigger and same with the size.

If the cap. says 16v 4700pF on it, for example, a 20v 5300pF or a 16v 6200mF cap. will work for this application.

Try different cables. That would be the most simple and cheapest fix.

It looks as though you have ripple noise that amplifies into the output. First of all check if the mains voltage is going down to produce the low voltage hum. If not you will have to check the DC filter capacitors , couple in parallel to confirm the capacitor. IF the buzz is still coming through then you will have to isolate the preamp and wait it the fault is coming in. If not connect the preamp output to another amp to hear the same buzz to confirm the preamp to be faulty. If so you will have to trace by a voltage check when the buzz occurs to confirm if the preamp IC or the selector Ic is faulty. Some logic IC's can also produce this noise on static switching. If teh noise is appearing on both the channels, then I would still bet on the power section. So check once again on the rectifier/ regulators and capacitors. Hope this advice helps. Good day

Hi,
It sounds like your motor has gone bad....it will buzz or hum when it is trying to start and cannot...

http://www.fixya.com/support/r4422207-dryer_repair_dryer_not_turning

heatman101

Asker's Testimonial " Thanks so much for your help. Now that you'v mentioned it, the buzzing does sound like it's coming from the motor. I'm,now, more comfortable in call " -

can u help me . tv just went out

I have a Amana ASD2622HRW Lately there is a loud buzz that comes and goes. We cleaned everything and blew it out under and behind the fridge. And it still is happening. Any suggestions? It still cools fine. But this Buzz is so loud that you can hear it through the house. Please help!

If the buzz disappears when you unplug the cable from the amp. check your cable.
If the buzz disappears when you unplug the cable from the instrument, there's something thay may have come loose inside the instrument.
If you unplug the cable from the amp., and the buzz persists, you'll have to have a competent tech. check your amp.

The ballast may not be the problem. The problem may be the ignitor (starter). If the fixture humms, then the ballast is most likely working. Ballasts (transformers) do not go bad very often.

I was going to suggest the low voltage transformer, but when you said it sounded like it was coming from the left side, that seemed odd. I have a stock transformer here I keep for test that is loud, but it works. Odd, eh?