Pfaff expression 2048 Owner's Manual - Page 22

Taking out the bobbin case, Thread tension, Bobbin thread is visible on the top side of the fabric,

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Preparations Taking out the bobbin case Lift the latch of the bobbin case and pull the bobbin case out of the machine. Release the latch and take the empty bobbin out of the bobbin case. Thread tension To obtain a perfect seam appearance and durability make sure the needle thread tension is correctly adjusted, i.e. the threads evenly meet between the two fabric layers. The following is valid for general sewing: Bobbin thread is visible on the top side of the fabric: The needle thread tension is too tight. The thread tension must be corrected. Top thread is visible on the underside of the fabric: The needle thread tension is too loose. The thread tension must be corrected. For decorative stitches and buttonholes the top thread should be visible on the underside of the fabric. 2:6

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2:6
Preparations
Taking out the bobbin case
Lift the latch of the bobbin case and pull the bobbin case out of
the machine. Release the latch and take the empty bobbin out of
the bobbin case.
Thread tension
To obtain a perfect seam appearance and durability make sure
the needle thread tension is correctly adjusted, i.e. the threads
evenly meet between the two fabric layers.
The following is valid for general sewing:
Bobbin thread is visible on the top side of the fabric:
The needle thread tension is too tight.
The thread tension must be corrected.
Top thread is visible on the underside of the fabric:
The needle thread tension is too loose.
The thread tension must be corrected.
For decorative stitches and buttonholes the top thread should
be visible on the underside of the fabric.