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III.
1. SELECTING UNIT SECTION ADJUSTMENTS ............................................. 32
2. UPPER SHAFT AND LOWER SHAFT TIMING............................................. 33
3. DRIVING BELT AND TIMING BELT TENSION............................................. 34
4. NEEDLE DOWN POSITION ADJUSTMENT ................................................. 35
5. NEEDLE FLOW.............................................................................................. 36
6. LEFT STRAIGHT LINE SEWING NEEDLE DESCENT AND THE ZIGZAG
MAXIMUM LEFT NEEDLE DESCENT ALIGNMENT .................................... 37
7. TIMING OF NEEDLE AND ROTARY HOOK ASSEMBLY (CLEARANCE
BETWEEN THE NEEDLE AND THE ROTARY HOOK POINT) .................... 38
8. NEEDLE BAR HEIGHT .................................................................................. 39
9. INNER ROTARY HOOK RETAINER PLATE L POSITION ........................... 40
10. INNER ROTARY HOOK ROTATION PREVENTION BRACKET POSITION 41
11. FEED DOG FRONT-REAR AND LEFT-RIGHT POSITION ........................... 42
12. FEED DOG HEIGHT ...................................................................................... 43
13. PRESSER BAR HEIGHT ............................................................................... 44
14. THREAD TENSION DIAL TENSION.............................................................. 45
15. SELECTION DIAL OUTER EDGE PLAY....................................................... 46
16. PATTERN DISPLAY SELECTION POSITIONING ........................................ 47
17. Z FINGER POSITIONING .............................................................................. 48
18. FEED BRACKET INSTALLATION POSITION .............................................. 49
19. SUPER PATTERN (TRIPLE SEWING).......................................................... 50
20. FEED ADJUSTMENT..................................................................................... 51
21. BH LEFT NEEDLE DESCENT AND ZIGZAG MAXIMUM LEFT NEEDLE
22. BUTTON HOLE STITCH LEFT REVERSE STITCH AND RIGHT
FORWARD STITCH LENGTH ....................................................................... 53
23. BUTTON HOLE STITCH BAR TACK FEED ADJUSTMENT ........................ 54
24. BUTTON HOLE STITCH BUTTON HOLE LENGTH ..................................... 55
25. THREAD WINDING ADJUSTMENT .............................................................. 56
26. FORWARD AND REVERSE STITCH LENGTH
(STRAIGHT LINE STITCH LENGTH) ............................................................ 57
27. INNER ROTARY HOOK TENSION................................................................ 57
28. NEEDLE STOP POSITIONING (NP) (BL6800 Only) .................................... 58
29. BACKSTITCH (BK) SWITCH ADJUSTMENT (BL6800 Only) ...................... 59
30. BOBBIN WINDER SWITCH ADJUSTMENT (BOBBIN WINDING)
31. NEEDLE THREADER .................................................................................... 60
32. NEEDLE THREADER
(CHECKING THE HOOK POSITION IN THE HORIZONTAL DIRECTION) .. 61
33. NEEDLE THREADER (EXCHANGE)............................................................. 62