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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

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!