Turntable Maintenance Introduction

[karcevgo]

Hi there. Have a pitch problem on my MK3D. When the fader on the first one is set on -4%, the Software shows it,s only -3,5%. The second MK3D os OK. When -4% is shown as -4%. That happens only in the range of -3% to -5%, then it becomes OK in -8% it's -8%. The dots show the proper values. What is the problem and how to solve it?