Troubleshooting - Casio CTK-720 User Manual

Troubleshooting

Problem
No keyboard Sound
Any of the following symptoms
while using battery power.
• Dim power supply indicator
• Instrument does not turn on
• Dim, difficult to read display
• Abnormally low speaker/headphone volume
• Distortion of sound output
• Occasional interruption of sound when playing at high
volumes
• Sudden power failure when playing at high volumes
Auto Accompaniment does not
sound.
On-screen keyboard guide keys
stay on.
When playing with another
instrument, keys or tunings do not
match.
Static noise when a microphone is
connected.
No microphone sound
After transferring song data from
my computer, playback stops part
way through.
A tone's quality and volume
sounds slightly different
depending where it is played on
the keyboard.
628A-E-035A
Possible Cause
1. Power supply problem.
2. Power is not turned on.
3. Volume setting is too low.
4. The POWER/MODE switch is
in the CASIO CHORD or
FINGERED position.
Low battery power
Accompaniment volume is set to
00.
Keyboard is waiting for play of the
correct note during Step 1 or Step 2
play.
Transpose or tuning is set to a value
other than 00.
1. Use of a microphone that is a
different from the type that is
recommended.
2. Use of the microphone in the
vicinity of fluorescent lighting.
1. Microphone volume setting is
too low.
2. Microphone ON/OFF switch is
set to OFF.
Digital noise from the USB cable or
power cord caused
communication between your
computer and keyboard to be
interrupted.
This is an unavoidable result of the digital sampling process,* and does not indicate malfunction.
* Multiple digital samples are taken for the low range, middle range, and high range of the
original musical instrument. Because of this, there may be a very slight difference in tonal
quality and volume between sample ranges.
Action
1. Correctly attach the AC adaptor, make
sure that batteries poles (+/–) are facing
correctly, and check to make sure that
batteries are not dead.
2. Set the POWER/MODE switch to the
NORMAL position.
3. Use the MAIN VOLUME slider to increase
volume.
4. Normal play is not possible on the
accompaniment keyboard while the
POWER/MODE switch is set to CASIO
CHORD or FINGERED. Change the
POWER/MODE switch setting to
NORMAL.
Replace the batteries with a set of new ones
or use the AC adaptor.
• Dimming of the display when playing at high volume
• Continued sound output even after you release a key
• A totally different tone may sound
• Abnormal rhythm pattern and demo tune play
• Abnormally low microphone volume
• Distortion of microphone input
• Dim power supply indicator when a microphone is used
• Sudden power failure when using the microphone
Use the SETTING button to increase the
volume.
1. Press the lit key to continue with Step 1 or
Step 2 play.
2. Press the START/STOP button to quit
Step 1 or Step 2 play.
Use the SETTING button to display the
applicable setting screens and set both
transpose and tuning to 00.
1. Use a recommended type microphone.
2. Move the microphone away from source
of the static.
1. Increase the microphone volume setting.
2. Change the microphone ON/OFF switch
setting to ON.
Stop playback, disconnect the USB cable
data from and then reconnect it to the keyboard's
USB port, and then try playing back the tune
again.
If this does not correct the problem, exit the
MIDI software you are using, and then
disconnect the USB cable from and then
reconnect it to the keyboard's USB port.
Next, restart your MIDI software and try
playback again.
See page
Pages
E-12, 13
Page E-15
Page E-15
Page E-15
Pages
E-12, 13
Page E-28
Pages
E-25, 26
Pages
E-25, 26
Pages
E-28, 29
Page E-16
Page E-16
Page E-16
Page E-16
Page E-31
E-33