Pfaff expression 2014 Service Manual page 29

Adjustment:
Leave the adjustment gauge on the needle plate.
Remove the top cover and the housing insert.
Slightly loosen the fastening screw on control cam 32 (fig. 18).
Set the stitch length to "0.5".
Turn the handwheel a full rotation forwards, then keep on turning it until point 31 is at 0.3 (fig. 17).
Set the stitch length to "00".
Keep on turning control cam 32 until the stepping motor switches.
Tighten the fastening screw on control cam 32 whilst ensuring that the cams of the control cam are in
the middle of the circuit board guides (fig. 19).
Cross-check:
Set the stitch length to "0.5".
Turn the handwheel a full rotation forwards, then keep on turning it until the feed dog (needle bar) is at
its highest position.
Turn the handwheel very slowly forwards until the pointer is at 0.3 (fig. 17).
In this position the feed dog must make a visible and audible movement (switching).
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