Electronic – convert the old Digital MIDI Keybaord Casio CTK 3000 into a MIDI device, which gives only midi output

circuit analysiskeyboardmidi

Recently my midi keyboard was damaged and it is not powering on, But now I realize I don't really need many features including speakers of the keyboard. So I thought I can convert into a small portable midi device. So the circuit in the image is the one which is giving midi output. Also this is the only one circuit the keys are connected to. So if I can power that circuit up I think it is going to work as a midi device, How to Power up only which pin should I connect to GND and power source, also how much voltage, Where can I find these details of a circuit board. The modal of keyboard is CASIO CTK 3000, and what are the precautions I should take. Also How can I power up the circuit with a USB cable from my laptop(if possible)
The 13 pins at the bottom of the image are the one, which is connected to the other board wich takes power input
Here is the Circuit Board which is giving midi output

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Best Answer

I'm unclear on whether you want to make your CTK-3000 into a MIDI controller, where the keyboard would generate MIDI signals to control other instruments, or a MIDI module, where the device would generate sound based on incoming MIDI messages. Either way, this seems like it would be a long project.

I could not find any technical data on the CTK-3000 keyboard, but I did find a service manual for the related CTK-2000 keyboard at https://manualzz.com/doc/1881381/casio-ctk2000-service-manual . The models share the same user manual, so they are likely very similar, but you'll want to look at the layouts and schematics carefully to see where your keyboard differs.

Looking at those schematics, I can tell you that converting to USB power could be hard to do. Part of the 9VDC power from either the wall wart or the batteries is converted to 5V to run various ICs -- and some of that is likewise converted down to 3.3V -- but it looks, from my quick look, like there are some parts run off the 9V natively. I don't know if those parts are the ones you want to keep using.

Good luck to you.

EDIT: After looking over the CTK-2000/3000 user manual and the CTK-2000 service manual that I linked to, I think I found the differences in the two: on the schematic, where there are portions labeled "Not used", those are parts that are in the 3000 and not the 2000. So these should be complete schematics to your keyboard.