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Harman Kardon AVR510 - At random times the volume will creep upwards. Other times it will shoot upwards. The remote works every time to turn it down, & the knob on the unit will work 50% of the time when this is happening. If anyone knows, thanks in advance

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I have worked on two h/k for no sound. The only problems I have found are bad solder joints. You have to look very close to see the cracks. Most of the are found at board conectors. The last one I worked on did not look like there were any bad solder joints, but after resoldering 100 pins on boards the unit came to life. I would start with the volume control. Their is a nut that holds the control tight to the frount face under the nob. If the control feels loose, moves side to side I would suspect your loose conection to be at the control itself. Make shure to tighten the nut on the control after you fix.

Posted on Apr 12, 2008

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Harman Kardon AVR 120 volume goes up all by itself. I turn it down, it goes up again. over and over ... then it stops doing it. Is it the optical cable? COMCAST?


After setting volume remove all remotes from the room. It is possible that a button is staying activated.

All in the setup of the TV if you are using the "net" option that allows for communication between devices on the HDMI connection turn off as a possibility.

Last resort is the volume control motor driven knob on receiver see if receiver is defective try with other inputs such as radio etc.

Disconnect all inputs and see if volume increases?


Hope this helps?

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NEVER USE MAXIMUM VOLUME FOR TROUBLESHOOTING.

Turn the volume control to something medium.

The errant switch, control or condition may change and you will suddenly release the amp's full power and possibly destroying your speakers. If a signal isn't audible at 1/2 volume it's probably not there.

Carefully examine the front panel for clues like a misplaced Mute or Tape Monitor control or Multichannel Analog Input selected.

There is a good chance that a common control may have developed a high-resistance or 'dead' spot through idleness and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.

Turn the volume to something reasonable and see if that helped.

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Or get a dock that will allow remote control and charging, such as Roth, DLO or Wadia.

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Thanks

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The problem is with the actual eltromechanical element on the volume control, my avr 300 does this as well and I'll let you know the secret to avoiding it. There are small indents on the volume control as you turn it, if you leave it half way between indents, it will periodically start reading volume changes, if you're lucky it will go down, if you're unlucky by the time you've noticed it act up your speakers are blown. When you change the volume, make sure the control rests in an indent and the problem will never crop up again. A simple solution if you're the only one that uses the receiver.

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