Pfaff ambition essential Owner's Manual page 34

The seam has uneven stitches
Is the thread tension correct?
Are you using too thick or slubbed thread?
Is the bobbin thread evenly wound?
Is a correct needle used?
The machine does not feed or feeds irregularly
Did you thread the machine properly?
Has sewing lint collected between the feed
dogs?
Have your sewing machine serviced regularly by your local authorized PFAFF® dealer!
If you have followed this trouble shooting information and still have problems, take your sewing machine
to your dealer. If there is a specifi c problem, it is a great help to test sew with your thread on a scrap of
your sewing fabric and bring it to your dealer. A sewing sample will often provide helpful information.
Non-original parts and accessories
The warranty does not cover any defect or damage caused by use of non-original accessories or parts.
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Check needle thread tension and the threading.
Change the thread.
Check bobbin winding.
Insert a proper needle correctly, see page 19.
Check how the machine is threaded.
Remove the stitch plate and clean the feed dogs with a
brush.