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the stitch length is governed by the cam action connected to the walking foot
that means that the stitch length is governed by the amount of material that is pulled through in the period of time that the needle comes up and goes down
normally the cam action is set by the stitch length lever/ reverse lever
if there is a necessity for a longer stitch, the cam would have to be changed on the drive shaft underneath
That will require a discussion with a sewing machine mechanic to determine if there are cams or other linkages that can be fitted to alter the stitch length for the manufactured maximum
There is a small wheel below the buttons on the right hand side that can be turned "up" or "down" to see the electronic letters properly. Sometimes that gets bumped accidentally and the screen appears to go blank - it's still there, just needs to have the letters darkened - they are just washed out.
Turn the little wheel and it should return.
If that doesn't work, quite possibly there is something else going on.
If you can stitch even without seeing the screen - that most likely is the answer. Good luck! S
Turn the dial for stitch length so that the black line that separates the stitch length numbers from the buttonhole functions is in the 12 o'clock position. This engages the gears that operate your red stitches.
Unfortunately, it sounds like you may have a computer board that's gone bad. Rare, but does happen and not something you will be able to repair yourself. There are a number of computer boards in the 7570.
I would suggest calling your local Pfaff dealer (if they are someone you trust) and having them check it out. If you're not pleased with your local dealer, you may find another dealer close enough to you to warrant the trip.
Best of luck getting your machine back up and running - we know how awful it is to be without!
Unfortunately, this is most likely a computer board issue and there's just no way to predict if/when a board will go bad.
Your only option at this point is to take it to an authorized Pfaff dealer. If the person who serviced it was an authorized Pfaff tech, take it back to them. If not, do take it to a Pfaff dealer - non-Pfaff authorized techs are not trained on the machines.
Sorry I can't give you a simpler answer, but until this is corrected, your machine won't work properly.