Troubleshooting - Yamaha Portatone PSR-640 Owner's Manual

Troubleshooting

PROBLEM
• The speakers produce a "pop" sound whenever
the power is turned ON or OFF.
• When using a mobile phone, noise is produced.
• No sound results when the keyboard is played.
• Not all simultaneously-played notes sound.
• Auto Accompaniment seems to "skip" when the
keyboard is played.
• Nothing happens or nothing seems to function,
even when pressing a panel button. For example,
pressing the [START] button does not start the
accompaniment.
• The accompaniment or song does not play back
even when pressing the [START/STOP] button.
• The Multi Pads do not play back, even when one
of the MULTI PAD buttons is pressed.
• The auto accompaniment does not start, even
when Synchro Start is in standby condition and a
key is pressed.
• The following buttons related to the auto
accompaniment do not function.
• [SYNC START] button
• [SYNC STOP] button
• [ACMP ON/OFF] button
• REGISTRATION MEMORY [FREEZE] button
• Certain notes sound at the wrong pitch.
• Auto accompaniment chords are recognized
regardless of the split point or where chords are
played on the keyboard.
• The Harmony function does not operate.
• MIDI data is not transmitted or received, even
when MIDI cables are connected properly.
• If you experience distorted or out-of-tune sound
from the Vocal Harmony feature, your vocal
microphone may be picking up extraneous
sounds (other than your voice) — the Auto
Accompaniment sound from the PSR-740, for
example. In particular, bass sounds can cause
mistracking of the Vocal Harmony feature.
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POSSIBLE CAUSE/SOLUTION
This is normal and is no cause for alarm.
Using a mobile phone in close proximity to the PortaTone may produce interference.
To prevent this, turn off the mobile phone or use it further away from the PortaTone.
• The R1/R2/L voice volume (Mixer) settings could be set too low. Make sure the
voice volumes are set at appropriate levels (pages 90).
• The Local Control function could be turned off. Make sure Local Control is turned
on (page 132).
• Check whether the naming function of Registration Memory or song recording
(page 62) is called up in the display or not. If the naming function is active, the
PSR-740/640 does not produce any sound, even when the keys are played.
You are probably exceeding the maximum polyphony of the PSR-740/640 . The
PSR-740 can play up to 64 notes (32 notes for PSR-640) at the same time —
including voice R2, voice L, auto accompaniment, song, and multi pad notes. Notes
exceeding this limit will not sound.
Make sure that Disk mode is engaged.
In the Disk mode, no panel operations can be executed (except for disk operations).
Exit from the display by pressing the [EXIT] button.
The MIDI Clock may be set to "EXTERNAL." Make sure it is set to "INTERNAL"
(page 132).
You may be trying to start accompaniment by playing a key in the right-hand range
of the keyboard. To start the accompaniment with Synchro Start, make sure to play
a key in the left-hand (accompaniment) range of the keyboard.
Check whether the Song mode (page 25) is selected or not. When the Song mode
is active, none of the auto accompaniment functions can be used.
Make sure that the scale tuning value for those notes is set to "0" (page 135).
Check whether the fingering mode is set to "Full" or not. If the Full fingering mode is
selected, chords are recognized over the entire range of the keyboard, irrespective
of the split point setting.
• Harmony cannot be turned on when the Full Keyboard fingering mode is selected
or if a percussion kit voice is selected. Select an appropriate fingering mode or
voice.
• Harmony cannot be turned on when a drum kit is selected for the voice R1.
The MIDI terminals can only be used when the HOST SELECT switch is set to
"MIDI." All other settings ("Mac," "PC-1" and "PC-2") are for direct transmission/
reception with a computer.
The solution to this problem is to ensure that as little extraneous sound as possible
is picked up by your vocal microphone:
• Sing as closely to the microphone as possible.
• Use a directional microphone.
• Turn down the MASTER VOLUME, ACMP volume, or SONG volume control.
• Separate the microphone from the instrument's speakers as much as possible.