Pfaff passport 2.0 Owner's Manual page 29

Bobbin thread breaks
The seam has uneven stitches
The machine does not feed or feeds irregularly
The main motor becomes overloaded
Check the bobbin thread.
Change the stitch plate.
Clean lint from bobbin area.
Wind a new bobbin.
Check needle thread tension and the threading.
Change the thread.
Check bobbin winding.
Insert a proper needle correctly, see page 18.
Check how the machine is threaded.
with a brush.
from the feed dogs and bobbin case area.
Re-thread the machine, both top and bobbin
threads.
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