Yamaha YOB-431 Owner's Manual - Page 9

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Yamaha YOB-431 Owner's Manual

Troubleshooting

Th e tone is not clear or the instrument
plays out of tune.
If pads are deformed or the body is crack-
ing, take the instrument to your dealer for
repair.
Th e keys are stiff . Th e keys do not move.
A spring may have been dislodged or the
keys may be deformed.
Cannot assemble because the joints are
too tight or too loose.
Th e joint cork may have shrunk or ex-
panded due to changes in temperature or
humidity.
Th e joint cork may be worn.
Th e keys are noisy.
Th e keys may lack oil or the screws may be
loose.
Th e cork or felt on the keys is worn or has
fallen off . Or, the keys may have come in
contact with the body or other keys.
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