Janome Professional Series - Curling Problem

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Curling Problem
To avoid the curling problem of the fabric being sewn, switch the
looper thread tension switching lever to “SOFT”, and adjust the
stitch length to “3.0” or higher.
If the skipped stitch occurs, adjust the stitch length to a higher
length, or switch the thread tension switching lever to “TIGHT”,
and adjust the thread tension.
SOFT
TIGHT