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Re Hitachi Stereo Receiver SR-703 A constant background humming type noise whether listening to AM or FM

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Check your cables for open circuit cable- and connect your antenna firmly and change its direction.

Posted on Jul 23, 2008

  • mohamed eltoni
    mohamed eltoni Jul 23, 2008

    confirm ground connection also.



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Hi. I have a Hitachi SR 802 circa 1975, the protection light has come on. What action should I take? Thanks


I would think that would indicate at least one of the channels producing DC at the output and the protection is saving your loudspeakers.

You probably need to take it to a Tech, the service manual is here if you have skills in that area: Hitachi SR 802 Manual AM FM Stereo Receiver HiFi Engine

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Str-de985 humming noise only when using FM tuner. Everything else works fine with no humming noise


Have you got a FM Antena hook up to it for the FM ,Sations, If not that could be causeing it to hum.

Dec 06, 2012 | Sony STR-DE985 Receiver

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Nad 7140 fm low frequency hum


This is probably a 60 cycle hum and the problem is more likely confined to the am/fm board, there is a bad ground due to poor solder joints, broken ground wire, an open capacitor, this may not be easy to find, but it is a start.

Apr 22, 2012 | NAD 7140 Stereo Receiver With Phono Input

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Sony TA-AV521 I have had this stereo system with surround sound for years. Recently I am finding that the surround sound mode is not working right. There is a lot of fading in and out whether it is on...


CD's and FM radio are created in 2 stereo channels. To listen to them in Surround, artificial processing has to take place in your receiver, so artifacts and fading are quite common when you do this. When you turn the surround off, your stereo is processing the information properly and it will sound right.

Mar 02, 2011 | Audio Players & Recorders

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I have Sony FM Stereo, FM-AM REceiver HT-DDW740. I have connected them per the diagram but I cannot get any sound. I get a message SPK OFF on the screen. Is there someting that protects and trips all...


Please make sure that the connections are secure and proper.
Make sure that the sound is not muted.
Make sure that you've selected the proper input by INPUT MODE button.
Remove and reconnect the source.
connect a different device and check
check whether you're getting sound when listening to radio.

Jan 22, 2011 | Audio Players & Recorders

2 Answers

With the Marantz SR 440/640 receiver, there is a Mono/Stereo push button. What position should the button be in to listen to a stereo broadcast? jefferj16@hotmail.com


I can't find the manual or a good picture of the front panel but I'll chime in anyway.

Are you sure the button applies to FM? It may be for overall stereo vs mono listening.

If it IS for FM choose Stereo. Mono if the station is so weak that it won't tune in stereo. Usually a receiver will have an Auto function that will do it automatically.

Dec 28, 2010 | Audio Players & Recorders

1 Answer

I have a new Onkyo TX-SR508 receiver. When listening to FM radio the audio cuts out repeatedly for anything from a few seconds to a minute. Power fluctuation is very unlikely to be the problem. Signal...


Does the display show "tuned" or "FM Stereo"? This would normally indicate a good reception. The tuner has a signal level threshold and if the signal gets to week, the receiver mutes to prevent noise in the speakers. Swithing to mono make reception less intolerant. Does the problem also occur, when you switch to mono?

Jul 14, 2010 | Onkyo Audio Players & Recorders

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When using the FM reciever, there is a


due to the nature of the f.m. signal you may notice a hum when locked into a signal especially during times of no modulation(talk/music),otherwise if its severe enough,look for ground loops and bad solder joints that let signals radiate through out the receiver and create humming,also check the power supply filter capacitors if its a 60 cycle line noise hum

Mar 19, 2010 | Audio Players & Recorders

1 Answer

Car stereo noise


This is induced noise from the alternator (alternator whine).
It is usually a bad ground from the alternator (or even a failing alternator) adiating through the electrical components of the vehicle.

Instead of using the ground wire from the wire harness of the vehicle - try making your own ground point into the nearest bare metal. in the dash.

If the noise is still present - a lot of noise can be introduced from the main fuse panel as well. Run the constant (direct power) wire from your batter - outside the vehicle and re-test. If the noise is gone, install that wire permanently - avoiding any electrical components as much as possible.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

Aug 24, 2009 | Car Audio & Video

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VCR Hitachi F361


The noise from the TV is called 60 cycle hum and it is caused by a capacitor that is open, a test for ripple voltage will confirm this The noise from the VCR is more then likely common mode noise which would not be heard but for the bad capacitors in the TV. Simply put the common mode noise is being added to the 60 cycle hum. Now for how to fix this, if you have a background in electronics you can use a schematic, multimeter and an oscilloscope and Multimeter to find the bad capacitors, and the schematic to tell you what the voltages and %ripple should be. If you do not have a background in electronics, take the set to be repaired

Sep 29, 2007 | Hitachi VTFX631A VCR

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