Pfaff Tiptronic 2040 Owner's Manual - Page 26
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look cover witch off main switch bid the hook cover (26) at the left side and pen it towards the front 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. hread tension iEtEi1 To obtain a perfect seam appearance and durability make sure the needle and bobbin thread tensions are correctly adjusted with regard to each other, i.e. the threads evenly interlace between the two fabric layers. The following is valid for general sewing work: Thread interlace is visible on the top side of the fabric: The needle thread tension is too tight or the bobbin thread tension is too loose. The thread tension must be corrected. Thread interlace is visible on the underside of the fabric: The needle thread tension is too loose or the bobbin thread tension is too tight The thread tension must be corrected. For decorative stitches and buttonholes the thread interlace should be visible on the under side of the fabric.