Hello Sir:

I observed in my newly bought PSR740 that a sound is
produced when I press a (white) key holding for a
while then very rapidly releasing it.The release time
is very quick and will not possibly occur in actual
play. But other keys are not behaving this way. My
PRS740 had just experienced a certain level of strain
during when I transported it as checked-in baggage in
four connecting international flights.

Please explain to me if this problem is mechanical
beneath the key springs or if there is a problem in
the internal circuit. So far, all other functions are
fine except this one disappointing observation.

This rapid key release can be best executed by
pressing a key with one finger and sliding the finger
to the edge of bottom of the key, thereby, rapidly
releasing the key up...AND the SOUND is produced.

I am greatly bothered. YOur technical explanation will
greatly ease the discomfort that I am experiencing
with my newly bought YAmaha PSR740 keyboard. Thank you
in advance.

Dexter

Hi there! I have the same observation too. Weird, though. Anybody there observed this popping sound when the PSR740 key is rapidly released? Please contribute. ANd to those who have seen the inner circuitry, please provide explanation. Thank you.

Bonjour!!!

Hi jun-jin,
Turn your master volume clear down. Slide your finger off the key now, is the poping sound still there? Could it be discribed as a rattle? I tried to answer Lothlorien's post on this same matter. But this should tell you if it's mechanical or not!
Nobby

It's not mechanical. The sound produce is the same pitch as the key being pressed. It's like pressing the key again when you release it very quickly.