Yamaha DD-55 Owner's Manual - Page 32

Troubleshooting, Do not attempt to repair this digital instrument

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Appendix Troubleshooting In many cases, problems or malfunctions that occur during use can be remedied easily. Please check the following list before deciding that your DD-55 is damaged. If the suggested remedy is ineffective, take the DD-55 to an authorized Yamaha dealer for proper diagnosis and repair. Do not attempt to repair this digital instrument by yourself as serious damage may occur. Problem A buzz or click occurs momentarily when the DD-55 is turned ON or OFF The LED display is completely dark. When the pads are struck, the display is dark and returns to "000". The custom pad voice assignments have disappeared or defaulted. No sound comes from the speakers. Striking two pads simultaneously results in one of the pads not sounding. Striking a pad results in other pads also sounding, though they were not struck. The selected voice does not sound when the pad is struck. The song or Demo does not start playback. "C|r" appears in the display when the POWER switch is turned ON, and backed up data has been erased. Cause/Solution This is a normal power surge noise that occurs when the POWER switch is operated. The batteries are low and should be replaced with a complete set of six new batteries immediately. Ideally, an optional AC adaptor PA-5D or PA-5C should be used to power the DD-55 (see page 5). • The volume is set too low. Adjust the volume (see page 8). • A plug is inserted into the PHONES/OUTPUT jack and should be taken out (see page 7). • The LOCAL ON/OFF is set to OFF. Set the LOCAL ON/ OFF to ON (see page 26). • You are in the MIDI/Utility mode. Exit the MIDI/Utility mode (see page 25). Refer to "DD-55 Sound Triggering" to resolve the problem (see page 13). The desired voice has not been assigned to the pad. Use the PAD ASSIGN function to program the desired voice to the appropriate pad (see page 11). The MIDI clock has been set to "E" (external). Change the MIDI clock setting to "I" (internal) (see page 25). Backed up data is initialized if batteries are not installed or AC adaptor is disconnected while the power is turned off (see page 31). 32

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Appendix
32
Troubleshooting
.......................................................................
In many cases, problems or malfunctions that occur during use can be remedied easily.
Please check the following list before deciding that your DD-55 is damaged.
If the suggested remedy is ineffective, take the DD-55 to an authorized Yamaha dealer
for proper diagnosis and repair.
Do not attempt to repair this digital instrument by
yourself as serious damage may occur.
Problem
Cause/Solution
A buzz or click occurs momentarily when the
DD-55 is turned ON or OFF
This is a normal power surge noise that occurs when the
POWER switch is operated.
The LED display is completely dark.
When the
pads are struck, the display is dark and returns
to “
000
”.
The batteries are low and should be replaced with a com-
plete set of six new batteries immediately.
Ideally, an
optional AC adaptor PA-5D or PA-5C should be used to
power the DD-55 (see page 5).
The custom pad voice assignments have disap-
peared or defaulted.
No sound comes from the speakers.
• The volume is set too low.
Adjust the volume (see page 8).
• A plug is inserted into the PHONES/OUTPUT jack and
should be taken out (see page 7).
• The LOCAL ON/OFF is set to OFF.
Set the LOCAL ON/
OFF to ON (see page 26).
• You are in the MIDI/Utility mode.
Exit the MIDI/Utility
mode (see page 25).
Striking two pads simultaneously results in one
of the pads not sounding.
Refer to “DD-55 Sound Triggering” to resolve the problem
(see page 13).
Striking a pad results in other pads also sound-
ing, though they were not struck.
The selected voice does not sound when the
pad is struck.
The desired voice has not been assigned to the pad.
Use the PAD ASSIGN function to program the desired voice
to the appropriate pad (see page 11).
The song or Demo does not start playback.
The MIDI clock has been set to “
E
” (external).
Change the MIDI clock setting to “
I
” (internal) (see page
25).
“
C|r
” appears in the display when the
POWER switch is turned ON, and backed up
data has been erased.
Backed up data is initialized if batteries are not installed or
AC adaptor is disconnected while the power is turned off
(see page 31).