333666999 Posted February 22 Share Posted February 22 my casiotone mt-52 seems to be tuned too sharp to where a C is almost C# and since i want to use it on recordings and during jams i’ve tried to tune it using the tuning screw on the back. however, when i turn the screw in either direction is doesn’t seem to have any effect but it does have a slight effect when the screw is wiggled. i’m yet to take it apart but will when i’m at mine and have access to tools. i’ve only just been given the keyboard recently by a relative who stored it in the attic for a long time, so maybe that caused this issue? i have no experience with vintage keyboards, especially repair, since i’m mainly a guitarist. any ideas on how i can fix it? thanks! Quote Link to comment Share on other sites More sharing options...
Chas Posted February 22 Share Posted February 22 Older Casios commonly had a tuning potentiometer for fine tuning their pitch. That's literally all that "tuning screw" is, a mini potentiometer mounted on the circuit board. Sometimes they get damaged by heavy handed people/ kids shoving screwdrivers into the recessed hole without using care (I found this on a damaged PT80 I bought a few years back), and it's also possibly that the potentiometer tracks and/ or wipers have oxidized over the years causing poor/ no connection. Best thing to do is open up your MT52 and have a look for any obvious damage or oxidization. You could also use a multimeter and test the resistance in operation. A simple clean might get it working again. Worst case is you might need to replace it, which is normally quite easy if you have basic soldering iron skills. Often you can find the value marked on the potentiometer making it easy to find generic replacements online. 1 Quote Link to comment Share on other sites More sharing options...
333666999 Posted February 22 Author Share Posted February 22 thanks for the advice! i’m gonna open it up tomorrow and have a look at the pot and hopefully it’s an easy fix, even if it’s a soldering job it should be fine since i have experience building guitar pedals. thanks again Quote Link to comment Share on other sites More sharing options...
pianokeyjoe Posted February 22 Share Posted February 22 Hi, yes, the issue sounds like a simple loose trim pot. At worse you just need to find another to replace it with which will be quite cheap, and at best, a resolder of the one in there now. Hope it works! I love my MT52/CT320s! Quote Link to comment Share on other sites More sharing options...
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