Pfaff coverlock 4852 Owner's Manual page 52

4-thread overedge seam
Program 07
When all tensions are correctly set, the loops
of both looper threads (pink and yellow) are
directly on the edge of the fabric.
The upper looper thread (pink) appears on
the underside of the fabric.
Set the pink thread tension to a higher value
and/or the yellow thread tension to a lower
value.
50 50
The needle threads (blue and green) are too
loose, causing larger loops of needle thread
on the underside of the fabric.
Set the blue and green thread tension to a
higher value.
The lower looper thread (yellow) appears on
the top side of the fabric.
Set the yellow thread tension to a higher
value and/or the pink thread tension to a
lower value.