Programming
Service Instructions 869-M PREMIUM - 00.0 - 07/2018 129
Calibration of the Stitch length (Feed Cal.Main)
The stitch length must be the same in forward and backward stitches.
As a test, sew a seam forward on paper, stop, and sew a seam backward.
The insertions of the forward and backward stitches have to lie within one
another. If this is not the case, then calibration is necessary.
To calibrate the stitch length:
1. Setting the stitch length mechanically ( p. 32).
2. Call up the Service > Calibration > Feed Cal.Main menu item.
3. Select the stitch length (-6/0/6) and confirm with the OK button.
4. Start the sewing test on paper with the pedal and then check the stitch
length:
5. If the test run is not the correct length, the values must be adjusted
accordingly:
6. Perform sewing test again and check the stitch length.
7. If the test run is the correct length, confirm with the OK button.
After calibrating the stitch length, it is advisable to perform another test in
standard sewing mode. Select a program that has a bartack. Perform the
test on paper again. The stitches should run neatly into each other; if this
is not the case, calibrate again.
WARNING
Risk of injury from the heavy machine head!
Crushing possible.
Tilt the machine carefully and in a controlled
manner. Never reach with the hands under the
machine.
Stitch length Length of test run
-6 Test run must be 60 mm
0 Test run must be almost 0 mm, and the penetration hole is
round, not oval.
6 Test run must be 60 mm
Stitch length Adjust values
-6 Reduce value – stitch length becomes smaller
Increase value – stitch length becomes larger
0 Reduce value – stitch length becomes larger
Increase value – stitch length becomes smaller
6 Reduce value – stitch length becomes larger
Increase value – stitch length becomes smaller
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