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Hey all, I'm new to this forum, but I'm looking for help repairing my Casiotone 403. I accidentally knocked it over and it now no longer powers on. If anyone happens to have any experience with these and could point me in the direction of the possible components which might've failed, I would be eternally grateful.

Looking for insight on AC adapters for 80s Casio keyboards, specifically AD-5 adapters. I have a Casiotone CT-605 and CT-310. The power ratings on the back panels of each are the following: DC 9V, 9.2W for the CT-605. DC 9V, 8.5W for the CT-310. No explicit rating is given for the input current. The AC adapter for both (and many others) is the Casio AD-5. I'm assuming that the adapters vary in name based on the region they're used. For instance AD-5U (USA), AD-5UL, AD-5J (Japan), AD-5E, AD-5EL, and so on. They all seem to output 9V, 850mA. Am I correct in assuming that the above keyboards require currents of 9.2W/9V = ~1022mA and 8.5W/9 = ~944mA? If so, why do the AD-5 adapters output a lower current than the devices they're supposed to power? What am I missing here? I have a non OEM adapter whose specs for output match the AD-5 adapter (9V, 850mA). Both of the keyboards turn on and seem to function completely fine with it, but I don't want to risk any long term damage, if any is possible. Thanks!

Hello, I am trying to repair a Casio CT-460 for a friend. I am equipped with an multimeter and a home made audio probe. The keyboard is making very little noise that is also buried under static. I can hear the tones play faintly when I press a key. This also applies to the 'Demo" track that plays when the demo key is pressed. I also cannot find any point on any of the boards that doesn't have a layer of static. I've probed pretty much everywhere (including places I shouldn't have) though there are placed where the tone is much louder. Specifically on the D23C module on the M5257 Board shown below. I had the idea to probe all the conductors in the Key to Board ribbon shown below, but the tones I got out of there were strange and nothing like what the speaker outputs. I've removed a speaker because I kept having to flip it with the board and that got annoying. I'll put it back on when/if the keyboard is repaired, but I didn't want the loose wires to confuse anyone. If anyone has any guesses as to what should be checked/replaced, any suggestions would be appreciated! Underside of the Full Keyboard: M4254 Board: M5257 Board:

Hi. My first test of CASIO CT-670, my the newest asset, heh. The song's name is "Mikromusikwerk 01". I left the original sound, just added some multitracking for various volume levels (which are not present on the machine itself). The sequencer was ATARI 520ST. Greetings.