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Right channel hum/buzz/distortion in record mode

I was recording when I heard a hum in my right channel via headphones. I thought it was a bad cord. I put it in record mode freestanding with nothing plugged into it and it still hummed. So at least I know it is internal which is not good news. Both the CD and hardrive play fine. The problem is ONLY in the record mode. HELP!!!!! Where do I go to get this repaired in the S. Florida area. I bought it at Guitar Center in Hallandale Florida.

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  • googler too May 11, 2010

    Does the hum appear on a finished CD? It may just be a fault in the headphone amp, in which case it won't appear at the audio outputs, the digital output, or on any CDs you make with the unit.



    Try plugging audio out into another unit, such as an amp with headphone facility, monitor it there and see if hum still present.

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The SR-16 uses an external transformer as the power supply which provides 9 volts AC. This ac power is converted to DC positive and negative voltages for the digital and analog portions of the circuit. Although the unit has been reliable generally, this symptoms sounds like of of the main filter capacitors in the DC converter circuit(rectifier, filters and voltage regulator) has broken loose or is defective. This will affect both channel equally. If the problem is in one channel, a broken shield on a cable or the output jack ground connection might have broken on that one channel.

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What is the source of the input signals? These need to be balanced lines and the sources need to be balanced. If you happen to be using condenser mics, you probably haven't turned on the Phantom Power in the mixer. If you are recording from a sound card in the PC, those have a lot of noise and are unbalanced and you have to use DI's with ground lift ahead of this mixer.

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Adjust Recording Levels.

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