Fritz Gegauf Bernina artista 630 Service Manual page 34

Assembly:
1. Fit new stepping motor and fasten with the two securing screws.
2. Power stepping motor: First connect stepping motor to P-Print then S-Print to power unit, only then
connect mains cable to power supply. Select pinning positions in service program (SP test 4e, p. 83)
3. Place drive pinion at axial distance of 0.5 mm to metal plate.
4. Lift rubber sleeve (a) up, and place gauge of 0.5 mm distance to metal plate.
5. Move drive pinion (40) to stop position and tighten screw (40a).
6. Switch machine off, remove 0.5 mm gauge, and refit rubber sleeve (a).
7. Slide crankshaft into spherical bearing, place toothed segment parallel (picture B), then place it against
stepping motor stop.
8. Slide stitch length transmission (crankshaft and motor bracket together) into the machine and fasten
with two screws (35).
9. Secure crankshaft with bushing support (37).
10. Re-hook tension springs (30-34).
11. Check if toothed segment and pinion are correctly positioned.
12. Refit balance shaft (28).
13. Pin crank (167) and balance cam (107), loosen screw (38), push toothed segment against stop and
retighten screw (38).
14. Refit covers.
15. Calibrate speed – Service Program test 4f (p. 84).
16. Fine-adjust balance (SP 5b, p. 88).
17. Carry out a functional check.
18. Sew-off.
107
a
40
First tooth pinion
First tooth toothed
segment parallel
picture B
Service-Manual_artista_630_640_english_V4.01_032069_50_04.doc
41
41
40a
34