Casio CTK-691 User Manual (English)

Other manuals for Casio CTK-691

User Guide122 pages

Service Manual28 pages

Questions and Answers:

A
austinwilsonAug 20, 2025
How to fix no keyboard sound on Casio Synthesizer?
- S
  Shane WagnerAug 20, 2025
  If your Casio Synthesizer keyboard produces no sound, there are several potential causes. First, ensure the AC adapter is correctly attached, the batteries are properly inserted with correct polarity (+/–), and the batteries are not dead. Also, verify that the power is turned on by pressing the POWER button and that the volume is adequately raised using the VOLUME knob. If you are playing in the accompaniment keyboard area while the MODE button setting is CASIO CHORD or FINGERED, try turning off Auto Accompaniment. Check if Local Control is off and turn it on. Finally, ensure that Mixer channel 1 is turned on and its volume isn't too low by adjusting it in the Mixer.
S
sandra56Aug 21, 2025
What to do if auto accompaniment does not sound on Casio Synthesizer?
- D
  deborahgibsonAug 21, 2025
  If the auto accompaniment on your Casio Synthesizer isn't working, it might be due to several reasons. Check that the accompaniment volume isn't set to '000'; if it is, increase it using the ACCOMP VOLUME button. Also, ensure that Auto Accompaniment part Channels 6 through 10 aren't turned off; use the Mixer to turn them on. Finally, verify that the volume setting for Channels 6 through 10 isn't too low; if it is, raise the volume setting for the applicable channel using the Mixer.
M
Mark WilliamsAug 25, 2025
How to turn on touch response on Casio Synthesizer?
- T
  Tiffany CarterAug 25, 2025
  If the sound output on your Casio Synthesizer doesn't change when you vary key pressure, it's likely that the touch response is turned off. Press the TRANSPOSE/FUNCTION button to turn it on.
C
Christopher GonzalezAug 26, 2025
Why no sound when playing MIDI data from computer on Casio Synthesizer?
- R
  randallolsenAug 26, 2025
  If no sound is produced when playing MIDI data from a computer on your Casio Synthesizer, first, check that the MIDI cables are connected properly. If they are, use the Mixer to ensure that the channel is turned on and the volume setting is not too low.
L
Leah MorrisAug 28, 2025
How to record chord accompaniment data on computer with Casio Synthesizer?
- V
  Victor WhiteAug 28, 2025
  If you cannot record chord accompaniment data on a computer from your Casio Synthesizer, ensure that Accomp/Song MIDI Out is turned on.
Z
zsandersAug 29, 2025
What to do if Casio Synthesizer keyboard starts up abnormally?
- J
  Jordan MejiaAug 30, 2025
  If your Casio Synthesizer keyboard starts up abnormally when turned on, it could be due to corrupted flash memory. First, remove the batteries and disconnect the AC adapter, then press the POWER button. After this, reload the batteries and/or reconnect the AC adapter, and press the POWER button again to turn on the power. You can also try performing a system reset operation using the TRANSPOSE/ FUNCTION button.
V
veronicagarciaAug 31, 2025
Why Casio Synthesizer has a dim display and low volume?
- N
  Nicole SalazarAug 31, 2025
  If your Casio Synthesizer exhibits symptoms like a dim power indicator, failure to turn on, flickering display, low volume, distorted sound, interrupted sound at high volumes, sudden power failure, or abnormal rhythm, it's likely due to low battery power. Replace the batteries with a fresh set or use the AC adapter to resolve this issue.
B
Betty Pearson DDSSep 2, 2025
Why Casio Synthesizer plays two tones at once?
- D
  Denise CoxSep 2, 2025
  If you hear two tones when playing the keyboard on your Casio Synthesizer, it means that the layer function is turned on. To fix this, press the LAYER button to turn off layering.

Casio CTK-691 Specifications

General

Number of Keys	61
Display	LCD
MIDI	Yes
Power Supply	AC Adapter or Batteries
Rhythms	100
Keyboard	Touch Response
Speakers	12 cm x 2
Effects	Reverb, Chorus
Song Memory	5 songs
Connections	MIDI In/Out
Polyphony	32 notes