Duerkopp Adler 550-867 Service Instructions Manual page 89

Calibrating the stitch lengths
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Pull the needle thread out of the needle.
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Put a piece of cardboard 1 under the sewing foot.
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Press the button "Cali. 1".
The following screen will appear:
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Press the button "Enter 100 stitches + length".
The following screen will appear:
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Press the foot pedal.
A predetermined section will be sewn.
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Measure the stitch length and enter it with the keyboard.
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Press "Return".
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Repeat the procedure for "Cali. 2".
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Memorize.
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