Yamaha PSR-S710 Owner's Manual page 100

Voice
The Voice selected from the Voice Selection display does not
sound.
A strange "flanging" or "doubling" sound occurs. The sound is
slightly different each time the keys are played.
Some Voices will jump an octave in pitch when played in the upper
or lower registers.
Style
The Style does not start even when the [START/STOP] button is
pressed.
Only the rhythm channel plays.
Styles in a USB storage device cannot be selected.
Song
Songs cannot be selected.
Song playback does not start.
Song playback stops before the Song is finished.
The measure number is different from that of the score in the Song
Position display, shown by pressing the [REW]/[FF] buttons.
When playing back a Song, some channels do not play.
The tempo, beat, measure and music notation is not displayed cor-
rectly.
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PSR-S910/S710 Owner's Manual
Check whether or not the selected part is turned on (page 32).
To select the Voice for the right-hand key range, press the PART
SELECT [RIGHT 1] button. For the Voice to be layered in the right-
hand range, press the PART SELECT [RIGHT 2] button. To select the
Voice for the left-hand key range, press the PART SELECT [LEFT]
button.
The RIGHT 1 and RIGHT 2 parts are set to "ON," and both parts are
set to play the same Voice. Turn off the RIGHT 2 part or change the
Voice of one of the parts.
This is normal. Some voices have a pitch limit which, when reached,
causes this type of pitch shift.
The Rhythm channel of the selected Style may not contain any data.
Turn the [ACMP] button on and play left-hand section on the keyboard
to sound the accompaniment part of the Style.
Make sure the Auto Accompaniment function is turned on; press the
[ACMP] button.
You may be playing keys in the right hand range of the keyboard.
Make sure to play keys in the chord range of the keyboard.
If the size of the Style data is large (about 120 KB or greater), the
Style cannot be selected because the data is too large to be ready by
the instrument.
This may be because the language settings have been changed. Set
the appropriate language for the Song file name.
If the size of the Song data is large (about 300 KB or greater), the
Song cannot be selected because the data is too large to be read by
the instrument.
The Song has been stopped at the end of the Song data. Return to
the beginning of the Song by pressing the SONG [■] (STOP) button.
In the case a Song to which write-protect has been applied ("Prot. 2
Edit" is shown at the upper left of the Song name), the original file
may not be in the same folder. It cannot be played back unless the
original file (showing "Prot.2 Orig" at the upper left of the Song name)
is in the same folder.
In case of a Song to which write-protect has been applied ("Prot. 2
Edit" is shown at the upper left of the Song name), the original file
name may have been changed. Rename the file with the original file
name (so that "Prot.2 Orig" is shown at the upper left of the Song
name).
In case of a Song to which write-protect has been applied ("Prot. 2
Edit" is shown at the upper left of the Song name), the file icon may
have been changed. Songs to which write-protect has been applied
cannot be played back when the file icon of the original has been
changed.
The Guide function is turned on. (In this case, playback is "waiting" for
the correct key to be played.) Press the [GUIDE] button to turn off the
guide function.
This happens when playing back music data for which a specific, fixed
tempo is set.
Playback of these channels may be set to "OFF." Turn playback on for
those channels that are set to "OFF" (page 54).
Some Song data for the instrument has been recorded with special
"free tempo" settings. For such Song data, the tempo, beat, measure
and music notation will not be displayed correctly.