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Nad 7100 intermittent loss of sound in left channel, turning the volume control up or down fixes it for a while.

After a few minutes or sometimes hours of use later the left channel intermittently goes away, no sound. Turning the volume control up or down brings it back for a while. Will come tuner cleaner help this out?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 4 Answers

SOURCE: NAD C272 Amplifier: Intermittent left channel

My solution was actually indeed the output protection relay. What I did was to open up the relay and use contact cleaner and a very fine abrasive to clean the contact surfaces of the relay. After that, the problem was gone!

The way to diagnose this for me was to run the amplifier open until the problem recurred and to simply tap the relay's box. The sound came on immediately, and I was convinced.

Posted on Feb 05, 2009

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tech240
  • 169 Answers

SOURCE: losing the right channel

usually this would indicate a dry joint inside or some other temp related intermittent fault, component problem. Take it to a tech and tell them what happens

Posted on Sep 20, 2009

  • 1 Answer

SOURCE: Sugden a21a - intermittent loss of channel -

had exactly the same problem myself, changed the balance, and the selector until Sugden suggested the relay. this did the job, and my amp is sorted. Shouldv'e changed this in the first place. Good as new. Shaun

Posted on Oct 23, 2010

  • 1 Answer

SOURCE: Restek amplifier channels cut out sometimes

My Restek has the same problem.
Change the volume potentiometer. Use an 10KOhm Alps potentiometer and your problem should be solved.
Peter

Posted on Jan 04, 2011

dunnbiker
  • 8546 Answers

SOURCE: Wotcha, i've just taken amp out of storage,

One way of proving it ISN'T the amp circuitry is to remove the pre-main jumpers and jack in a source that has its own volume control (or try a CD that starts really low) because this bypasses ALL the amps controls. If it sounds ok (albeit LOUD) I'd suspect oxidized contacts on the controls. Turn it off and vigorously operate all controls a zillion times to wear through it. In mosty cases it's the unused controls that fail because they never get wiped. Maybe a shot of contact cleaner on those you can access.

http://www.overload.it/supporto/643/manuali/NAD-C350.pdf

Posted on Oct 18, 2011

Testimonial: " Thanks Mr Dunn Sorted, after twiddleing volume control up and down a trillion times everything came back to normal, so it was a dirty/corroded pot as i know understand, i bought some Caig DN5 and applied it carefully, problem totally solved. Thankyou P. Furtek."

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You have to turn up the volume to 38+ in order to hear the TV, when you use to be able to hear it at 10, is there a control board that goes out and what Is the name of it?


Hi Geoff, I hope I can help you with this. If you are using an accessory device (DVD, DVR) check cables to see that they are secure and if device has audio out option that it is set correctly. Also check to see that Video and Audio cables are connected to matching inputs on your set.
If you are using DVI to HDMI you will need to use a separate digital audio cable. DVI cables do not carry audio signal. After attaching the audio cable if you still do not hear sound you may need to set Digital Audio In. To do so:
  1. Press Menu Button on remote.
  2. Press the cursor ring down to highlight SETUP.
  3. Press the cursor ring left to enter SETUP menu.
  4. Press the cursor ring down to highlight SOURCE.
  5. Press the cursor ring left to enter SOURCE menu.
  6. Press the cursor ring down to highlight DIGITAL AUDIO IN.
  7. Press the cursor ring down to select the source you want to associate Digital Audio with. HDMI 1 or HDMI 2 in this case. You might need a software update also.
    The latest software solves the issues below:
    1. TV (Plasma 42" and 50") will not turn ON/shut off itself and Red LED blinks 4- times. Recover if main switch on/off.
    2. 37" LCD full white screen appear when upgrade software.
    3. Some channels not available after turn ON.
    4. Delta volume changes, not remembered.
    5. Preferred channel changes, not remembered.
    6. Green or yellow static (sometime snowy) on HDMI picture.
    7. Picture and sound loss for 5 to 10 sec (green LED is still ON) and back to normal.
    8. Audio loss in all inputs and can be recovered when main switch ON and OFF.
    9. TV set turn ON by itself/ green LED light up and goes off when set is ON.
    10. Intermittent audio loss in NTSC RF channel.
    11. Crack sound with high input signal.
    12. Include the possibility to download the rating table (RRT5 capability) for digital programs.
    13. No video/ no picture with sound.
    14. Intermittent On-Screen Menu pop up by itself and can be removed by pressing the 'MENU' button.
    15. Channel information display too long.
    16. Improvement on scramble channel.
    How to check the current software version on my TV set?
    1. Press 'MENU' button on remote control to display the on-screen menu.
    2. Select TV MENU and press the cursor right.
    3. Select INSTALLATION and press the cursor right.
    4. Select SOFTWARE UPGRADE and press cursor right.
    5. Select CURRENT SOFTWARE INFO to display the current software version on your TV set.
    6. If the TV software version is lower than the version posted on the website means your TV set needs to be upgraded.
    7. Follow the instruction in the user manual or Firmware Upgrade Readme file on how to upgrade your software.
    Where can I find the latest software for my TV set?
    The Firmware Upgrade Software and Readme File documents can be found on the Philips support website. Refer to the SOFTWARE section.

Feb 04, 2016 | Televison & Video

1 Answer

How to fix old 1970s receiver Loss of volume or sound to one channel


volume control is like a rheostat and has a tendency to corrode over time. try working the control vigorously back and forth numerous times. if this fails, carefully remove receiver cover and use electrical contact cleaner (comes in a spray can). if this fails, you'll probably have to hunt down a new one.

Aug 27, 2012 | Audio Players & Recorders

2 Answers

Wotcha, i've just taken amp out of storage, has'nt been used for a while cant get volume to work properly the sound goes from speaker to speaker and up and down in volume whilst crackeling a lot as...


One way of proving it ISN'T the amp circuitry is to remove the pre-main jumpers and jack in a source that has its own volume control (or try a CD that starts really low) because this bypasses ALL the amps controls. If it sounds ok (albeit LOUD) I'd suspect oxidized contacts on the controls. Turn it off and vigorously operate all controls a zillion times to wear through it. In mosty cases it's the unused controls that fail because they never get wiped. Maybe a shot of contact cleaner on those you can access.

http://www.overload.it/supporto/643/manuali/NAD-C350.pdf

Oct 15, 2011 | NAD C350 2-Channel Amplifier

1 Answer

Sugden a21a - intermittent loss of channel - fading in and out sometimes left, sometimes right. Always corrects temporarily when fiddle with function knob or quickly turn up volume when it bursts forth....


had exactly the same problem myself, changed the balance, and the selector until Sugden suggested the relay. this did the job, and my amp is sorted. Shouldv'e changed this in the first place. Good as new. Shaun

Mar 14, 2010 | Audio Players & Recorders

1 Answer

My Rotel RA-931 integrated has an intermittent left channel. It occasionally cuts out or loses most of its volume. The key thing is this: if I crank the volume it'll suddenly come back and be okay for a...


This could be a bad solder joint, or dirt in the volume control. Try spraying the volume control with Servisol Video 40, available from electronic shops such as Maplin, or Radio Shack.

Dec 22, 2009 | NAD C272 Amplifier

1 Answer

Losing the right channel


usually this would indicate a dry joint inside or some other temp related intermittent fault, component problem. Take it to a tech and tell them what happens

Sep 17, 2009 | NAD C370 2-Channel Amplifier

1 Answer

Nad C320 right channel stops working then comes back again


This sounds like the "pre-amp" section is cutting out or there is some interruption in the signal path. A few things to try:

1) With the unit off, try "working" the volume,balance and tone controls. This means, turn them up and down a number of times to clear any debris that may be in the controls themselves.

2) Work the input selector switch the same way if it is a rotary switch.

3) Try turning on/off the tape monitor switch a few times.

4) Keep track of whether this problem is sensitive to heat. Does teh channel shut down more quickly once the unit has been on for a while?

Lastly, if you can solder, look for any solder joint that appears grainy or has rings and resolder it.

Update this with your results and we'll continue on...

Thanks,
Dan

Jan 15, 2009 | NAD C320 2-Channel Amplifier

1 Answer

NAD C370 Right channel distortion


Sounds like you have lost the power amp transistor(s) or IC for this channel.

Aug 29, 2008 | NAD C370 2-Channel Amplifier

1 Answer

Sound through one channel


Only the right channel had a sound,the left channel is mute, whatever adjustment you did and whatever balancing you done nothigs happen,even you interchange the speakers. The problem is in the power amp. The STK IC there is busted already, it's better to change it with a new one so the performance become normal again.

Jun 14, 2008 | NAD C372 Amplifier

2 Answers

NAD C272 Amplifier: Intermittent left channel


My solution was actually indeed the output protection relay. What I did was to open up the relay and use contact cleaner and a very fine abrasive to clean the contact surfaces of the relay. After that, the problem was gone!

The way to diagnose this for me was to run the amplifier open until the problem recurred and to simply tap the relay's box. The sound came on immediately, and I was convinced.

Apr 03, 2008 | NAD C272 Amplifier

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