srt focus check
SRT Focus Issues Page

Focus Accuracy on Film Plane

One way to check this requires a second camera equiped with a long lens.
if focus
out of focus
I've never had a problem with this test, so cannot make a recomendation as to proper way to adjust, if things are not good.  The adjustment screws are under the leatherette on the front of the camera, if it makes a difference.

focus screen

Viewfinder Focus Accuracy 

50mm f1.7 MD Lens Focus Accuracy Repair

I recently received a Rokkor 50mm f1.7 MD lens with that had it's focus setting out of adjustment.  The fix was surprising easy.
len tools