Duerkopp Adler 550-867 Service Instructions Manual page 88

84
"SM"
When this function is activated the stitch length adjustment can be
calibrated and checked.
Checking the stitch lengths
–
Pull the needle thread out of the needle.
–
Put a piece of cardboard 1 under the sewing foot.
–
Press the button "Check 2 mm".
–
Press the foot pedal.
A predetermined section will be sewn.
–
Measure the stitch length.
–
Proceed as described for the other stitch lengths.
1