The EasyTuner and Slim tuners are designed to be tuned in just a few steps using a convergence method.
Start by removing all jumpers.
Insert Jumper S1. If the tuning indicator shows IN then the leave it in. If it shows OUT then take it out.
Repeat for the rest of the jumpers then use the fine tuning adjustment screw to get the green OK light to illuminate.
See attached PDF for detailed instructions.