Artista 640 Upper Thread Tension - Fritz Gegauf Bernina artista 630 Service Manual

4.24 artista 640 upper thread tension

Disassembly:
1. Remove covers.
2. Disconnect thread clamp magnet (22)
3. Remove link clip (20).
4. Remove screw (21).
5. Remove the two securing screws (58).
6. Remove thread tension unit.
Assembly:
1. Fit new thread tension unit and tighten securing screws (58)
and (21).
2. Refit link clip (20).
3. Note the position of the thread tension release.
4. Set the stitch width limiter (73) with screw (74).
5. Reconnect thread clamp magnet plug.
6. Refit rear and front covers.
7. Set thread tensioner (p. 63-64).
8. Set regulator spring (p. 65):
9. Check thread tension release mechanism. (p. 61)
10. Sew-off.
58
Service-Manual_artista_630_640_english_V4.01_032069_50_04.doc
22
20
21
42