Appendix; Troubleshooting - Yamaha Portable Grand DGX-660 Owner's Manual

Appendix

Troubleshooting

For the Instrument
Problem
When the instrument is turned on or off, a popping
sound is temporarily produced.
The power is automatically turned off.
When using a mobile phone, noise is produced.
Noise is heard from the instrument's speakers or
headphones when using the instrument with an
iPhone/iPad application.
There is no sound even when the keyboard is
played or when a Style or Song is being played
back.
Playing keys in the right hand area of the keyboard
does not produce any sound.
The Style or Song does not play back when the
[START/STOP] button is pressed.
The Style does not sound properly.
No rhythm accompaniment plays when the [START/
STOP] button is pressed after selecting style num-
ber 174 or a style between 188–205 (Pianist).
Not all simultaneously played notes sound.
The footswitch (for sustain) seems to produce the
opposite effect. For example, pressing the foot-
switch cuts off the sound and releasing it sustains
the sounds.
The sound of the Voice changes from note to note.
The appropriate display does not appear when the
[SONG/AUDIO], [STYLE], or [VOICE] button is
pressed.
The ACMP indicator does not appear when the
[ACMP ON/OFF] button is pressed.
The "Over Current" message is shown in the upper
left area of the MAIN display and the USB device
does not respond.
The Headphone sound is too low.
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DGX-660 Owner's Manual
Possible Cause and Solution
This is normal and indicates that the instrument is receiving electrical
power.
This is normal and due to the Auto Power Off function. If necessary, set
the parameter of the Auto Power Off function (page 19).
Using a mobile phone in close proximity to the instrument may produce
interference. To prevent this, turn off the mobile phone or use it further
away from the instrument.
When you use the instrument along with an iPhone/iPad application, we
recommend that you set "Airplane Mode" to "ON" on your iPhone/iPad in
order to avoid noise caused by communication.
Check that nothing is connected to the PHONES/OUTPUT jack on the
rear panel. When a plug is connected to this jack, no sound is output.
Check the Local Control on/off setting ("Local"). (See page 74.)
Is the FILE CONTROL display showing? The instrument's keyboard,
etc., will not produce any sound while the FILE CONTROL display is
showing. Press the [EXIT] button to return to the MAIN display.
When using the Dictionary function (page 65), the keys in the right hand
area are used only for entering the chord root and type.
Is External Clock set to ON? Make sure External Clock is set to OFF;
refer to "External Clock" on page 74.
Make sure that the Style Volume (page 63) is set to an appropriate level.
Is the Split Point set at an appropriate key for the chords you are play-
ing? Set the Split Point at an appropriate key (page 64).
Is the "ACMP" indicator showing in the display? If it is not showing press
the [ACMP ON/OFF] button so that it does show.
This is not a malfunction. Style number 174 and style numbers 188–205
(Pianist) have no rhythm parts, so no rhythm will play. The other parts
will begin playing when you play a chord in the accompaniment range of
the keyboard if the ACMP is turned on.
You are probably exceeding the maximum polyphony (page 90) of the
instrument. When the maximum polyphony is exceeded, the earliest
played notes will stop sounding, letting the latest played notes sound.
The polarity of the footswitch is reversed. Make sure that the footswitch
plug is properly connected to the SUSTAIN jack before turning on the
power.
This is normal. The AWM tone generation method uses multiple record-
ings (samples) of an instrument across the range of the keyboard; thus,
the actual sound of the Voice may be slightly different from note to note.
Is another display showing? Try pressing the [EXIT] button to return to
the MAIN display, and then pressing one of the mentioned buttons.
Always press the [STYLE] button first when you are going to use any
Style-related function.
Communication with the USB device has been shut down because of
the overcurrent to the USB device. Disconnect the device from the USB
TO DEVICE terminal, then turn on the power of the instrument.
Make sure the parameter of "Output Gain" is set to "Headphones" (page
58).