Janome 9102D Instruction Book page 56

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Looper thread tension is out of balance (1)
The illustration shows sewing results when the lower
looper thread tension is too tight and/or upper looper
thread tension is too loose.
Remedy:
Loosen lower looper thread tension and/or tighten
upper looper thread tension.
1
Wrong side of fabric
2
Right side of fabric
3
Right needle thread
4
Left needle thread
5
Upper looper thread
6
Lower looper thread
13
Upper looper thread tension dial
14
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.
13
Upper looper thread tension dial
14
Lower looper thread tension dial