SOURCE: Consew Industrial Machine 2270 stitch length dial not working
Sounds like it is either out of time or the adjuster spring needs to be replaced.
SOURCE: bernina 1080 stitch length and needle jumping problem
you will most likely find that just adjusting the stitch length and width controls for a while will correct the problem (if the machine has been sitting idle for some time the stepper motor linkages seem to stiffen up a bit but i have good success with continual adjustment until they free-up.
also try switching machine off and on again to ensure it resets correctly.
the combination of both above fixes works 95% of the time - otherwise, as you mentioned circuit board and or stepper motor replacement may be necessary (however if both length and width are playing up it is unlikely to be an electrical fault).
scott
SOURCE: model 385.15718500..machine only goes in reverse
Sounds like the reverse mechanism has jammed...either with lint or lack of use and oil/lint has frozen the mechanism.
Unplug the machine and remove the base. Clean all the lint with small brush and vacuum.
Try the reverse lever to see where the connecting rods are and identify the collar around the bottom shaft....try to move manually, use a little lubricant where the collar moves on the shaft.
In extreme cases it may take several applications over several days to rectify this, but as this is only 3 years old, should respond quickly
SOURCE: old bernina 830 stitching problem: tight
Sounds like you need to adjust the tension. Probably a good idea to oil this older machine before you adjust. Also look for and clean out any lint or debris in bobbin case and around foot area.
SOURCE: My old Bernina 1130 has never given me trouble,
If you have a drop feed mechanism make sure you have not dropped the teeth down by mistake, make sure you have enough pressure on the foot, remember you should not be able to pull the fabric through by hand if the teeth are up
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Thank you. The reply about working the machine and lever constantly until it engaged was good and gave me confidence to keep trying. The machine had been standing unused in a cold room for a year or two and obviously felt unloved! I did find a piece of thread in the mechanism which could have contributed to the fault.
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