Trouble Shooting Guide - Bernina L220 Manual

Trouble shooting guide

Problem
・ Presser foot pressure is too low.
Fabric does not feed
evenly
・ The thread tension is too tight for thread
Thread breaks
・ The machine is not threaded correctly.
・ Needles are not inserted correctly.
・ Needles are bent, blunt, points are dam-
Needle breaks
・ Needles are not inserted correctly.
・ Fabric was pulled while sewing.
Skipped stitches ・ Needles are bent or blunt.
・ Wrong needles used.
・ The presser foot pressure is too low.
・ Thread is not wound correctly around the
Poor stitch formation
・ Thread got caught.
Seam flute or wave,
・ Fabric was pulled while sewing.
・ The presser foot pressure is too tight.
especially when sewing
・ The differential feed is not set correctly.
knits
Seam pucker ・ The thread tension is too tight.
・ The differential feed is not set correctly.
・ The thread tension is too tight.
Fabric edges curl
41
Cause
being used.
aged.
tension dials.
Solution
・ Adjust the presser foot pressure.
・ Reduce the thread tension.
・ Check the threading.
・ Insert needles fully into the needle clamp
with flat side to the back.
・ Use needle system 130/705H.
・ Replace needles.
・ Insert needles fully into the needle clamp
with flat side to the back.
・ Guide fabric gently with both hands.
・ Replace the needles.
・ Use needles of system 130/705H.
・ Increase the presser foot pressure.
・ Check if thread is lying between the tension
discs.
・ Check the threading path of each thread.
・ Guide fabric gently.
・ Reduce the presser foot pressure.
・ Adjust the differential feed to N-2.
・ Reduce the thread tension.
・ Adjust the differential feed to 0.7-N.
・ Reduce the thread tension.
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