Casio Celviano AP420ES1B User Manual (English)

Questions and Answers:

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Nicholas TuckerJul 30, 2025
Why does my Casio Electronic Keyboard take so long to turn on?
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  chandlerjasonJul 30, 2025
  If it takes a long time to use your Casio Digital Piano after turning it on, it could be due to corrupted memory data from a data transfer operation interrupted the last time you turned off the piano. The piano will perform a memory format operation, which takes about 20 seconds. Wait until this is complete and avoid turning off the Digital Piano during data transfers with a computer.
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ujohnsonAug 4, 2025
How to fix no sound on my Casio Electronic Keyboard?
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  Theresa HansenAug 5, 2025
  If no sound is coming from your Casio Electronic Keyboard when you press a key, here's what to check: * Ensure the VOLUME controller isn't set to “MIN”; rotate it towards “MAX”. * Make sure nothing is plugged into the PHONES jacks; disconnect any headphones or adaptors. * Verify that MIDI Local control is turned on; if not, enable it.
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Jeffrey BaldwinAug 9, 2025
What to do if my Casio Celviano AP420ES1B sounds strange?
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  Joe ReidAug 9, 2025
  If your Casio Digital Piano sounds strange, and restarting doesn't help (for example, note intensity doesn't change with key pressure), the “Back up” feature might be enabled. Turn off “Back up”, then power the piano off and on again.
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Rhonda CarlsonAug 14, 2025
Why is the pitch off on my Casio Celviano AP420ES1B?
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  Laura BrownAug 14, 2025
  If the pitch of your Casio digital piano is off, here are some things to check: 1. The key setting might be something other than “0”. Change the key setting to “0”, or turn the digital piano off and then back on again. 2. The digital piano tuning might be incorrect. Adjust the digital piano tuning, or turn the digital piano off and then back on again. 3. Octave shift might be enabled. Change the octave shift setting to 0. 4. A non-standard temperament setting might be used. Change the temperament setting to “00: Equal”, which is the standard modern tuning.
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Cindy IngramAug 19, 2025
How to fix data transfer issues on Casio Electronic Keyboard?
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  Taylor AlexanderAug 19, 2025
  To fix this, ensure the USB cable is correctly connected to both your Casio digital piano and your computer. Also, verify that you've selected the correct device within your computer's music software. If the issue persists, turn off the digital piano and exit the music software. Then, turn the piano back on and restart the software.
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Samuel RodriguezAug 25, 2025
What to do if the pedal doesn't work on my Casio Celviano AP420ES1B Electronic Keyboard?
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  Jasmine GarciaAug 25, 2025
  If nothing happens when you press a pedal on your Casio Electronic Keyboard, make sure the pedal unit cable is properly connected.

Casio Celviano AP420ES1B Specifications

General

Type	Digital Piano
Number of Keys	88
Touch Response	3 sensitivity levels, Off
Polyphony	128 notes
Metronome	Yes
Duet Mode	Yes
Amplifier Output	20W + 20W
Power Consumption	18W
Tones	16
Effects	Reverb (4 types), Chorus (4 types)
Pedals	Damper, Soft, Sostenuto
Speakers	12 cm x 2
Terminals	Headphones x 2
Lesson Function	Yes
Transpose	Yes
Tuning	Yes
Power Supply	AC adaptor
Included Accessories	AC adaptor, Music stand