Duerkopp Adler 580 Service Instructions Manual page 113

If the looper setting has to be changed, proceed as follows:
–
Press the "F" key .
The sewing machine goes to the position "0".
–
Lift the machine.
The screws for the looper setting are now accessible.
–
Change the looper setting.
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Lower the machine.
–
Press the "OK" key.
The sewing motor goes to the test position 2 again.
–
Check the looper setting.
–
Press the "OK" key..
The sewing motor goes to the test position 3 (right loop stroke).
Check the looper setting and if necessary proceed for the setting as
described previously.
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