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104 72 79-26
Contents
Directions for use ...............................................................................................................................................................4
ESD.......................................................................................................................................................................................4
Service tools.........................................................................................................................................................................5
Settings..................................................................................................................................................................................6
Settings - Quick reference..................................................................................................................................................7
1. Belt tension -drive belt ...............................................................................................................................................10
2. Belt tension -motor belt .............................................................................................................................................10
3. The play of the hook gear .........................................................................................................................................11
4. Setting the hook in relation to the feeding eccentric (After feeding)..................................................................12
5. The gap between the needle and the hook .............................................................................................................13
6. Setting the needle plate (the hook cover) in relation to the needle in the feeding direction...........................14
7. Setting the feed dog in relation to the needle plate................................................................................................15
8. The height of the hook..............................................................................................................................................16
9. Feed dog height ...........................................................................................................................................................17
10. Setting the needle in centre position ........................................................................................................................18
11. The needle bar height .................................................................................................................................................20
12. The timing of the hook in relation to the needle ..................................................................................................21
13. Needle threader stop ..................................................................................................................................................22
14. Threading device .........................................................................................................................................................23
15. Presser foot parallelism to the feed dog ..................................................................................................................24
16. Presser foot height to the needle plate ....................................................................................................................24
17. Pivot height ..................................................................................................................................................................25
18. Stitch length balance basic setting ............................................................................................................................26
19. Stitch length balance .................................................................................................................................................27
20. Lower thread tension (thread tension of the bobbin case) ..................................................................................28
21. Thread tension releaser 830 850 ...............................................................................................................................29
22a.Upper thread tension 830 850 .................................................................................................................................30
22b.Upper thread tension 870.........................................................................................................................................31
23. Setting the thread take-up spring..............................................................................................................................32
24. Disconnection when winding the bobbin ...............................................................................................................33
Service program Sapphire ...............................................................................................................................................34
Functions of the service menu 1 - Step motors ..........................................................................................................35
Functions of the service menu 2 - Display and Sensor..............................................................................................36
Functions of the service menu 3 - Test patterns .........................................................................................................37
Functions of the service menu 4 - Info and Test patterns.........................................................................................38
Functions of the service menu 5 - Key Board Test ....................................................................................................39
Front Lid ............................................................................................................................................................................40
Rear cover...........................................................................................................................................................................40
Front cover.........................................................................................................................................................................41
Base Plate ...........................................................................................................................................................................42
Power supply......................................................................................................................................................................43
Circuit board - Circuit diagram Sapphire 850/830......................................................................................................44
Circuit board - Circuit diagram Sapphire 870...............................................................................................................45
Tension unit .......................................................................................................................................................................46
Tension unit - Replacement of the tension discs 830/850 ........................................................................................47
Tension unit - Replacement of the tension discs 870 .................................................................................................48
Tension unit - Replacement of the Stepmotor 870.....................................................................................................49
Sewing head .......................................................................................................................................................................50
Step motor of the needle.................................................................................................................................................51
Step motor of the Presser bar.........................................................................................................................................52
Presser bar bushing...........................................................................................................................................................53
Needle bar bushing.............................................................................................................
..............................................54
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