Yamaha DDK-7 Benutzerhandbuch

Appendix

DDK-7 Owner’s Manual

263

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.