Troubleshooting - Yamaha DD-45 Owner's Manual

Troubleshooting

Problem
When the instrument is turned on or off, a popping
sound is temporarily produced.
The LED display is dark.
The volume is too low.
The Custom Kit Voice assignments have disap-
peared or been reset to their default settings.
When using a mobile phone, noise is produced.
No sound comes from the speakers.
None of the buttons work.
The power was turned off suddenly.
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DD-45/YDD-40 Owner's Manual
Possible Cause and Solution
This is normal and indicates that the instrument is receiving electri-
cal power.
The batteries are low or dead. Replace all six batteries with com-
pletely new ones, or use an AC adaptor.
Using a mobile phone in close proximity to the instrument may pro-
duce interference. To prevent this, turn off the mobile phone or use it
further away from the instrument.
The volume is set too low. Adjust the volume (page 9).
Check that nothing is connected to the [PHONES/OUTPUT] jack on
the rear panel. When a plug is inserted into this jack, no sound is
output.
The panel buttons have been locked. Turn off Panel Button Lock
(page 10).
The Auto Power Off function (page 9) is active. When the instrument
is not in use for about ten minutes, power is turned off automatically.