Question about Parasound HCA-1000A 2-Channel Amplifier

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There is a humming sound in the background when playing music. Also the humming sound is present when you turned the volume to zero. Thanks...

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Try plugging your amplifier to a surge protected extension cord, if your amplifier cord

Posted on Jun 05, 2010

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Posted on Jan 02, 2017

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I HAVE A NUMARKKMX01 MIXER WHEN I PLUG THE RED RCA JACK IN TO THE MIXER I GET A LOUND HUM


What is plugged into your Numark mixer when this happens? Try disconnecting ALL audio inputs to your mixer, turn mixer volumes to zero and see if the hum is still present. Adjust the volume and check if the hum you mentioned returns. If it is still heard, try new cables between the mixer and amp...if not then start reconnecting inputs until the hum is heard again. It's a process of elimination but not that difficult to find the source of your problem.

Oct 31, 2012 | Numark Industries Numark DM 1200 Mixer

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How do I get the annoying programmed background music off?


Press "Menu", Select "Setup Tab", Select "Sounds" press >, then use Arrows UP and Down to select "Operation" Then use " " to select volume 0 to 7, then press "Set" . Setting to Zero "0" will mute the sound. Please vote if my information is helpful or not. Recommend me. Thanks UAW 974

Jun 26, 2011 | Casio Exilim EX-V7 Digital Camera

2 Answers

I was cleaning my phone and I pressed on something and now there is music playing that i can not stop,I don't know how to stop the music,my phone is panasonic KX-T7730


Here are two methods to turn off background music, one of these should work depending on which Panasonic phone system your phone is connected to.

1) With phone idle, press the 1 key on the dial pad (turns off background music when it is on and turns on background music when it is off).


2) With phone idle, press intercom button then dial *751 on the dial pad followed by 0 on the dial pad to turn off background music(confirmation tone will be heard) and end by lifting handset and replacing in cradle. To turn background music on, press intercom button then dial *751 on the dial pad followed by 1 or 2 on the dial pad to select the background music source(confirmation tone will be heard) and end by lifting handset and replacing in cradle.

Feb 05, 2011 | Panasonic KX-T7730 Corded Phone

1 Answer

The amp plays fine for about 15 to 20 minutes, then an extremely loud, over powering hum/buzz takes over, and then the amp has to be turned off, but the problem persists. I've tried several guitars,...


You say the "tubes are fine" I take it that you have either replaced them with new or used a very sophisticated tester on them. A heater-cathode short might cause the symptom. There are a bunch of tests I would want you to run alnd get back to me with the results.

Heat up the amp but DO NOT play anything into it for the usual failure time or more and they start to play i... did hum occur WITHOUT playing? With all volume controls down does the hum occur?

The right tools is an oscilloscpe to fing out if the filter caps are good. These are C31, C33, C35, C36.

With hum present in failed stater, plug in a grounded plug into the power amp in jack... if hum is stiil there, check the +/- 16 volts regulating Zener for ripple. get schematic here:

http://elektrotanya.com/fender_hot-rod-deluxe_sch.pdf/download.html

Jan 29, 2011 | Fender Hot Rod Deluxe Guitar Combo...

2 Answers

There is a loud hum when volume is on low to high


go to control panel
sound and audio devices
voice
under voice recording clk volume and mute the mic phone...........
or
some how your mic is conflicting with speakers. Keep your mic away from your speakers..

Do reply if this woks

Oct 03, 2009 | Bose Companion II Computer Speakers

1 Answer

My Panasonic KX-T7730 has a humming sound when the phone is hung up. If I turn the volume down, I have to turn it up when I am on the phone.


It would play music if you had a music source plugged into the cabinet.

Without picking up the handset, press "1". Your humming should stop. It's the command for Background Music ON/OFF.

Carl

Mar 18, 2009 | Panasonic KX-T7730 Corded Phone

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