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YES. Either plug in headphones into the headphone socket. There should be a switch on the back which disables the speakers as well. A simple ON/OFF switch for speakers
Old reply so hopefully it's fixed. Dust or hair can get through the gaps and land on or near the contacts of the electronic key sensors. To be on the safe side (rather than doing a diy) take it in to the technicians. They'll have it fixed in a jiffy
The unit will have to be opened and the key restored to the normal position. Most have a spring, sometimes a leaf type that holds the key up and locked in. When opening the unit care must be used as there are ribbon cables between the halves of the cover.
First thing is to verify if the sound is there using headphones. This is important test as it isolates problems in power amps and other connected equipment that may be sensitive to the particular pitch of those keys. If it is in the headphones, then likely you will have to take it to a repair shop as the problem would be very deep in the unit's sound generator hardware.
One of the two contacts for that key is not working. This could be dirty or damaged contact. They use a conductive rubber pills that the key presses against circuit board traces. One contact makes before the other and this is how velocity is sensed. Unless you are adept at this repair, I would recommend you take it in for repair. Chances are any part cost is negligible... mostly labor to open and access the contacts for cleaning. Clean ONLY with 99% isoprophyl alcohol and Q TIps... VERY GENTLY.
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