Casio ap-620 please wait - Casio AP-620 AP620 Digital Cabinet Piano Black

https://thehub.musiciansfriend.com/keyboard-buying-guides/pianos-and-keyboards-how-to-choose
https://www.amazon.in/Keys-Keyboard-Electronic-Digital-Piano/dp/B005N0AML4
https://www.amazon.com/Casio-CTK-720-Key-Musical-Keyboard/dp/B000V0CU6G
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http://www.archive.org/stream/NEW_1/NEW.txt&ld=20140121&ap=2&app=1&c=uk.dogpl&s=dogpileuk&coi=239138&cop=main-title&euip=65.55.52.108&npp=2&p=0&pp=0&pvaid=0ecbb68aa2494234817f86c47110b9e9&ep=2&mid=9&en=qD9Z4iWOaaPlhngGE2dCw8AB6g1YUAk6exyPXtpCYBrFbShTfF8rj

mostly caused by faulty tone generator ic. get a qualified tech to confirm this

Hi :). Are you referring in Casio Cleviano model AP-33? Because i try to search for Casio Cleviano but there is no result. the only available is the model for Casio Cleviano model AP-33.
Casio AZ 1 Service Manual Parts List Page 6 . I hope this link can help you to find out the manual for your casio model. thanks

Only newer models with class-compliant USB (made last 12 months) can connect to MACs - & IPADs and PCs.
Older models require drivers available only for Windows.

It is 3 years/5 years warranty depending on your country.
Call CASIO warranty or contact dealer.

Jeremy hi
you must open the piano and change the headphone jack

Could possibly power supply problem. If you're running through a multi-board, try running directly into the outlet. Failing that, try another power outlet altogether.
The Celviano range aren't real power hoggers once going, but initialising and starting up takes a bit of omph.

There is a POT at the back of the keyboard to tune the keyboard.
Download "AP tuner" to your laptop to help you tune. If you use a desktop PC, you need to connect a good microphone.

What has happened is that one signal wire of the matrix that scans the keyboard has opened up. Each key has two contacts. One closes before the other and that is how they measure key velocity to control the loudness for piano sounds for example. When one contact doesn't work, often the sound is set to MAXIMUM key velocity resulting in MAX loudness. The key contacts are scanned digitally in groups of usually 8 or 12 and, for instance, every C key has a single line attached and then every group of 8 or 12 has a second line and then there are two complete sets of these to implement the velocity sensing. Your unit probably has either a break in a cable or possibly a cable connector that has failed or not seated OR worst case, the circuit board under the keys has a crack breaking one wire or circuit trace going to that section of the keys. The problem will require opening the keyboard to repair. If you are not electronically adept, besst to take this to a repair shop.

My AP-620 has a pedal problem too... it sticks and I keep hearing the music I play ring out after the pedal is relaesed