Pfaff coverlock 4852 Owner's Manual page 57

3-thread rolled hem (folded)
Program 15
The upper looper thread (pink) only partly
loops around the fabric edge.
Set the pink thread tension to a lower value
and/or the yellow thread tension to a higher
value.
The upper needle thread (green) is too loose.
Set the 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 one to a lower value.
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