Bernina Serger Owner's Workbook page 14

Adjusting Tensions, continued
Upper Looper - Increased Tension
Adjust the upper looper thread tension lever to 7 to increase the
tension on the looper thread.
Serge the third piece of folded fabric, cutting off the fold.
Examine the sample. The looper threads do not lock on the edge
of the fabric. The lower looper thread is pulled tightly to the front
of the stitch.
Label, trim, and mount the sample.
Upper Looper - Decreased Tension
Change the upper looper thread tension lever to 2 to decrease the
tension on the looper thread.
Serge the fourth piece of folded fabric, cutting off the fold.
Examine the sample. The looper threads do not lock on the edge
of the fabric. The upper looper thread is visible on the back of the
fabric. The looper threads are very loose.
Label, trim, and mount the sample.
Return the thread tension levers to normal.
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