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You're gonna' have to open it up to troubleshoot and it could be more than one thing. What is the condition of the tuning string and is it slipping...is there slack it it?
Provided everything is in place can you freely move the tuning cap by it's pully does everything else moves freely with it? There may be some dry areas that may need a little lube (pivet points, needle slider, etc) but make sure the string is not slipping but should grab..even if there's resistance however stop at this point and determing what is dragging down the works.
Or if there's some slack in it if you press your finger against it and turn the shaft does everything move then? Sometimes you can reposition the dial cord string spring at the tuning cap to take up the slack.
If the string is in good shape then a soap bar rubbed over it does wonders to help make it grip at the tuning shaft.
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