Bobbin Winder Motor; Base Shaft - Bernina activa 125 Service Manual

Exchanging the bobbin winder motor
Disassembly:
1) Remove all covers.
2) Remove the securing screw 42.
3) Exchange the bobbin winder motor.
Assembly:
1) Mount the new bobbin winder motor and secure
with screw.
2) Refit all covers.
3) Check the functions of bobbin winding (page 34).
Exchanging the base shaft
Disassembly:
1) Remove all covers.
2) Disconnect springs 30 – 34.
45
32
30
31
44 43
5) Loosen screw 46, along with the belt tensioner 47,
release the tension and retighten screw 46.
6) Remove the shaft bearing 48 along with screw 49.
Do not loose ball bearing and springs!
7) Loosen screws 35 of the stepping motor SL.
8) Remove the shaft by pulling to the front and to the right.
9) Exchange the shaft.
Assembly:
1) Refit the new shaft.
2) Pin the balance piece and the hook drive crank (motor
must be removed).
3) Position the bevel gear and the base shaft, so that the
marker pin is in a horizontal position (270°) to the front.
4) Secure the bearing holder bracket.
5) Refit the belt to the main and base shafts, being careful
of the position and set the belt tension.
6) Remove the pinning tools.
7) Refit the feed-dog drop mechanism.
8) Secure the stepping motor SL.
35
35
34
33
44
3) Remove the feed-dog mechanism 43 by loosen the
securing screws 44.
4) Remove the two bearing holder brackets 45.
45
46
47
49
48 49
9) Reconnect the springs.
10) Refit the shaft bearing 48 (ball bearing and springs!!).
11) Refit the main motor and set belt tension.
12) Refit the ventilator fan.
13) Refit all covers.
14) Recalibrate the maximum speed (test programme No.
6, page 16)
15) Recalibrate the buttonhole.
16) Test the functions.
17) Sew-off.
29
42
45