Pfaff ambition essential 1.0 Service Manual page 10

23. Lower thread tension (thread tension of the bobbin case)
The thread tension spring of the bobbin case shall give a resistance of 10-14 g when
pulling the thread slowly, using normal polyester thread.
24. Upper thread tension
When the thread tension dial is set at 4 a correct take-up should be obtained at straight
stitching and zig-zag using normal cotton fabrics and polyester thread.
But It should be around 70-80 Gram , if the bobbin tension is set correctelly.
25 and 26. Stitch length balance
The darning stitch shall look according to illustration.
Use Service mending stitch in menu 4 key.
27. BH photo sensor position adjustment
The BH lever crank (b) and the photo sensor's (c) blocking movement should be
set in the middle.
28. Adjustment of bobbin winding
When winding up the lower thread onto the bobbin the machine should wind even.
29. Adjustment of bobbin winder stop
When winding up the lower thread onto the bobbin the machine should stop
when there is a min. of 1 mm between the edge of the bobbin and the thread.
10
Settings - Quick reference
104 73 15-26
a
2
0 mm
c
b
2