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14
Appendix
DDK-7 Owner’s Manual
263
Troubleshooting
Problem Possible Cause and Solution
GENERAL OPERATION
The sound is not heard for about 10 seconds after
turning the power on.
This is normal; the DDK-7 takes a while to start up.
A cracking noise is sometimes heard. Noise may be produced when either an electrical appliance is turned on or an
electric power tool (such as drill) is used in the proximity of the DDK-7. If this
occurs, plug the DDK-7 into an electrical outlet located as far as possible from
the device that seems to be the source of the problem.
Interference from radio, TV, or other sources occurs. This is caused by the proximity of a high-power broadcasting station, an
amateur ham radio setup or a mobile phone.
The sound of the DDK-7 causes surrounding objects
to resonate.
Because the DDK-7 is capable of producing powerful bass sounds,
resonance may be caused in surrounding objects, such as cabinets or glass
windows. To avoid this, relocate the objects or lower the DDK-7’s volume.
In the LCD display, there are some black points (unlit)
or white points (always lit).
Unfortunately, this is a common characteristic of TFT-LCDs.
The sound is too small even when the volume is set to
its maximum.
• The Master Volume may be set around the minimum position. Turn it
clockwise.
• The Expression Pedal or Foot Pedal may not be pressed down. Press it
down with your toe.
Foot Pedals has no effect. “OFF” is selected in the Foot Pedal display. Select function to assign it to the
Foot Pedal. (page 196)
The DDK-7 panel does not function normally or the
content of the memorized data has changed.
This happens very rarely. Occasionally, power surges and spikes due to
electrical storms or other reasons may cause the DDK-7 to malfunction and/or
alter the contents of memorized data. If this happens, perform the Factory Set
operation to reset the DDK-7 (page 23).
The Pedal Unit does not work. A cable of the Pedal Unit is disconnected. Make sure that power is OFF when
connecting or disconnecting the pedal.
Some parts cannot be heard from the Headphones or
an external speakers.
The parts are assigned to AUX OUT SUB jacks. If you want to hear all parts
from Headphones, select AUX OUT MAIN jacks for all parts. (page 228) If you
want to hear all parts from an external speakers, use the output from the mixer.