Casio Privia PX-130, 8 months old
We have a Privia PX-130 about 8 months old. Recently, the sound has been fluttering like it has a fast but subtle tremolo added to every sound. Its nerve wracking. It happens with both internal speakers and anything powered that's plugged into the headphone jack, but it isn't detectable with actual headphones. What's going on?
If I were to venture an educated guess I would vote for failing filter caps in the power supply.
The power is likely collapsing under load of the speakers but headphones take much less drive.
If this has an external wall-wart power supply, you might try a new one IF the output is found to be under the rated voltage.
Internal power supply components are beyond those individuals that are not adept at electronics.
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I have a Privia PX330. At power up the whole keyboard is flat one semitone. This happens most times I power up. After factory reset same thing. Accompaniment is A440, but the rest of the keyboard is flat. When i adjust master tuning... the semitone off still exists between the Accomp and the keys. No Wi-fi around, pwr plugged into a pwr bar. Why is this happening?
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