aroot

Hey, thanks for the quick reply. As per your recommendation, I looked around and found a few adapters over 1A, but I will most likely reverse the polarity on some 9VDC positive center adapters -- they're easier to come by. It is strange that Casio didn't come out with a more appropriate adapter for the CT series. I'd like to think there's some piece of missing information here, but it doesn't seem likely. Anyway, thanks for the useful information! I'll have to look into setting up a beefier power supply, should I buy more keyboards.

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!

Hey there, any news on whether you were able to fix your keyboard? I have an MT-100 with a very similar issue and would greatly appreciate any ideas on how to fix it.