When the needle thread is too strong:
The bobbin thread will be pulled to the front side of the fabric.
Turn the thread tension adjustment dial towards "-1" to "-3".
When the needle thread is too low:
The needle thread will be pulled to the wrong side of fabric. Turn the thread
tension adjustment dial towards "+1" to "+3".
In case a correct tension setting is not obtained, check thread paths for
both needle and bobbin threads.
Needle thread
Bobbin thread
Bobbin thread
Needle thread
Fabric (wrong side)
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Fabric (wrong side)
Fabric (right side)
Fabric (right side)