Kenmore 385.16677 Owner's Manual page 65

Thread Tension (3 threads)
Correct tension
The illustration at right shows sewing results with
correct tension settings. However, adjusting the
thread tension may be required depending on the
type of fabric and thread being used.
(_ Wrong side of fabric
(_) Right side of fabric
(_ Right or left needle thread
(_ Upper looper thread
(_ Lower looper thread
Thread tension adjustment
* Set all three thread tension dials at "3".
Then serge, and check the tension balance.
If the tension balance on the test piece is not
satisfactory, you can adjust the thread tension
with thread tension dial.
(_ Thread tension dial
Setting mark
(_ Loosen
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Remedy:
Loosen lower looper thread tension and/or tighten
upper looper thread tension.
(_ Upper looper thread tension dial
Lower looper thread tension dial
Looper thread tension is out of balance (2)
The illustration shows sewing results when the upper
looper thread tension is too tight and/or lower looper
thread tension is too loose.
Remedy:
Loosen upper looper thread tension and/or tighten
lower looper thread tension.
@ Upper looper thread tension dial
Lower looper thread tension dial
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