I have the 21-T control. When the turret tries to index it rotates some amount then tries to seat. It should rotate 30 degrees per tool but it doesn't. The encoder that is connected to the turret shaft seams to be o.k. (I can rotate it by hand and the display on the 21-T screen makes sense). I can also rotate the turret manually by setting bit 2 of K2 (keeper relay). It seems to be in control. It's like the machine has forgotten it needs to rotate 30 degrees/tool. Are there parameters that store info on the turret? Its encoders?
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