Duerkopp Adler 506 Service Instructions Manual page 33

Position 1 (thread lever low position)
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Set the "Program" switch to "67".
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Press the "STOP" key.
The program is activated.
The display shows "N-TEST-> ".
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Press the " " key.
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Select the rpm of the sewing drive with the "Program" switch.
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Press the " " key.
The sewing drive runs at the selected rpm.
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Release the " " key.
The sewing unit positions in position 1 (thread lever low position).
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Check the position of the thread lever.
If necessary, correct the positioning.
To correct:
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Remove the cover 2 of the synchronizer.
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Loosen clamping screw 6.
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Turn the light stops 4 and 5 so that their light slits are offset 180°,
that is, lie across from each other.
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Tighten clamping screw 6.
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