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No power, some hum!!!! in side - Audio Players & Recorders

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Power supply is defective. The hum you hear is 60 cycles from an improperly filtered dc line.

Posted on Apr 06, 2015

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Posted on Jan 02, 2017

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Why does my HTS-20 powered subwoofer make a low hum when plugged in, even turned off and not connected to the receiver and a louder hum when the subwoofer power is turned on?


I suspect the amplifier is damaged. This is not an easy repair to do unless you are well versed in audio electronics. I would recommend a repair shop to look at the subwoofer amplifier.

Jun 03, 2015 | Infinity HTS-20 System

1 Answer

Ice maker not dispensing - no hum


Good Morning Friend,

I understand the ice maker will not dispense ice on your Frigidaire refrigerator, model# FRS26R4A. I also see that there is no hum and it does not seem to be getting power. I suggest resetting your appliance, by either unplugging it or shutting the power off at your home's circuit breaker, for 3-5 minutes. When power is restored, try getting water out of the dispenser as well as ice. I ask that you please follow up with a comment on the post, at your convenience, to advise if further troubleshooting is needed or if your refrigerator status has changed successfully. Hope this is helpful.

-Best Regards-
WP

Jun 14, 2014 | Frigidaire FRS26R4A Side by Side...

1 Answer

I have a pair of JM lab Electra 905 speakers, running through a DNM amp and power amps. When powered up, the left speaker makes a very loud humming noise. This has happened recently. I haven't changed...


Hello
Switch on your amp, keep its volue down to extreme low, and listen if there is still hum through the left channel or not. If still there is hum, the left side power amplifier section inside the amp;ifier is faulty. If htere is no hum at this state, hum enters thorugh the audio input terminal, and the input wires must be checked for open sheild connection. OK.

Apr 10, 2011 | Jmlab Electra 905 Speaker

1 Answer

My midland 1001z has power to it but all it does is give a humming sound!The mic. will key up and the tx light comes on but when I release the mic. the humming sound gets louder,is the unit screwed? thks...


If you are using a power supply. Get you a better power supply(full filtered) RADIO SHACK has many 12 volt 3 amp models. Run power wires away from radio about 10 feet away to eliminate hum. AM does hum when its near power lines, household appliances. Keep it away from TV's etc. Turn off TV then listen to it. Make sure you have good outdoor antenna like Antron A99 18ft. Fiberglass on Tv pole or Tower. If its inside car --its the engine. you need a Radio Shack Power filter. A coil of wire wrapped around a core and big capacitor on the (+) side shunted to ground by a 470uf Capacitor. Turn off engine then listen.

Apr 04, 2011 | Midland 1001Z 40-Channels Base CB Radio

1 Answer

My Sony model SS-MSP1 , SA-WMSP1 , AC120V , 60HZ , 50W hums.


If it hums on the audio side on all channels it might be the 60hz mains hum getting through. This is caused by the failure of the large Electrolytic capacitors in the power supply.
Another cause of hum (not in the audio) is the transformer. Also parts that hum should be replaced. If you can't pin down a huming part IE where it is. Then use a drinking straw as a stethoscope, by putting one end in your ear and the other over the PC board.

Feb 14, 2010 | Sony Audio Players & Recorders

1 Answer

Why two 24 Vac on aprilaire 700's control unit?


Okay, I looked up the installation manual online to see exactly what you are working with.
Yes the R anc C need to be hooked to the transformer supplied with the unit. The primary 120v side needs to be hooked into the power coming into the furnace. this can easily be done were the L and N get hooked into your furnace or circuit board on the furnace. This will provide the contiuous power to the unit. Preferably you will hook this after the door switch of the furnace so that you will kill the power toit if you take the blower door off.
The ODT terminals are for the outdoor sensor if you want to hook that up it will vary the humidiy in your home according to the outdoor temperature then.
Now the W/G and Cf terminals. If you have 24v coming from the HUM terminals of your furnace you DO NOT need a second transformer. You must check your furnace manual or check the voltage to them with the furnace blower energized. The HUM terminals will only have power to them when the blower should be running.
If the HUM terminals are 120v then you need to get another transformer and hook up the primary side to the HUM terminals so it is powered only when the the blower is running. Hook the secondary side to the W/G and Cf terminals.
So bottom line is that you need to figure out what voltage your furnace is giving to the HUM terminals and then go from there. Some times the EAC terminals or the ACC terminals will be 24v on the furnace board. Either of them could be used also, as they are only energized when the blower is running also.

Heatman101

Jan 25, 2010 | Aprilaire 700 Humidifier

1 Answer

Frigidaire side by side - fridge side temp too low


It sounds as though your thermostat is not cycling your compressor off causing it to run until the point of freezing. If you sit and listen, you will hear it hum. If it never stops humming, 9 times out of 10, the power outage shorted your thermostat.

Jan 30, 2009 | Frigidaire FRS26R4A Side by Side...

1 Answer

Humming from speakers when CD player running


Yes, The humming is always there you just can hear it better when the cd is playing. The humming is caused by the electrical system in your car. There is an inline filter you can buy and insert it between the car's power source and the head unit. I had a head unit I bought that was absolutly terrible until I installed that filter. Also if you did a do it yourself job on your amp wiring it is usually best practice to run your RCA cables on the opposite side of the car as your power cable. You can also purchase shielded spark plug wires which is a source of noise usually of a different kind tho. First make sure you have a good ground. This means that you have grounded your amp to bare metal not painted metal. If that didn't work put in the inline filter on the head deck as they are only $20 available at radioshack. If that doesn't work, go back an wire your car right this time and put the power and RCA on opposite sides of the car. If you still have that hum it may be the spark plug wires but that sounds more like static than hum. You have a text book case of alternator hum... Hack

Jul 11, 2007 | Xtreme Sound WMS336 CD Player

1 Answer

Loud hum on subwoofer.


try another speaker on that channel if you get no sound or it hums then it is time to take your set to a tech your audio out put on that side is damage along with some caps.good luck.

Mar 30, 2007 | Polk Audio RT1000I Speaker

1 Answer

Subwoofer hums under power not hooked to system & hooked up?


This may or may not apply to your particular problem. On similar humming sound problems, I normally would look for either a fault in the input side and/or a leaky/defective capacitor in the power supply. On the input side, this may be a frayed shielded wire, loose connector (esp. the outer which is normally the ground). Try completely removing the connecting/input cable that goes into the subwoofer. If that doesn't work, then it you may want to check the big capacitor in the power supply section of the subwoofer. If you are not that familiar in working with power supplies, may I suggest that you ask any electronic technician to have a look at it since capacitors store a rather hefty voltage. Better be on the safe side. Hope this works out ok with you

Mar 11, 2007 | Harman Kardon Harmon Kardon SoundStick II...

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