Problem with stitch lenght control, The control adjusts internally, the amount of movement from the grip feet. If no change, fault or material is slipping, increase pressure on the foot, if no change, try without material, moving the control, by turning by hand, you should be able to see amount of movement on the base feet, while turning, and changing stitch size, you should be able to see a difference in the movement, If you can, material slipping
SD
April 2012