Bernina B 590 Service And Maintenance Manual page 3

4.2.10 Sensor support ABC (presser foot recognition) .............................................................................. 54
4.2.11 Head frame and frame arm LED sewing light ................................................................................. 55
4.2.12 PCBA-Embroidery module detection ............................................................................................... 57
4.3 Electromechancial/Mechanical Components ...................................................................... 58
4.3.1 Hook and hook driver ........................................................................................................................ 58
4.3.2 Main feed-dog and feed-dog carrier .................................................................................................. 61
4.3.3 Replacing the hook driver drive belt .................................................................................................. 62
4.3.4 Stitch plate carrier with integrated thread-cutting unit ....................................................................... 63
4.3.4.1 Replacing the blade of built-in thread-cutter unit ............................................................................ 65
4.3.5 Base shaft ....................................................................................................................... 67
4.3.6 Crank shaft and stitch length stepping motor ................................................................... 68
4.3.7 Replacing base shaft and vertical shaft connecting belt ................................................... 69
4.3.8 Feed-dog carrier and advance link .................................................................................. 69
4.3.9 Upper feed crank ............................................................................................................. 70
4.3.10 Upper feed (Dual Feed) ................................................................................................. 71
4.3.11 Clutch carriage ................................................................................................................................ 72
4.3.11.1 Adjusting the thread-cutter and stitching-start solenoid ............................................................... 73
4.3.12 Thread take-up cover with automatic upper-thread tensioning unit ................................ 74
4.3.13 Needle-bar support ........................................................................................................ 75
4.3.14 Needle bar ....................................................................................................................................... 75
4.3.15 Needle clamp ................................................................................................................ 76
4.3.16 Threading mechanism ................................................................................................... 77
4.4.16.1 Threader head ............................................................................................................ 78
4.3.17 Thread tension ................................................................................................................................. 79
4.3.18 Thread take-up lever and thread regulator spring .......................................................... 80
4.3.18.1 Thread regulator spring ................................................................................................................ 80
4.3.19 Main motor ....................................................................................................................................... 81
4.3.20 Stitch length stepping motor ............................................................................................................ 82
4.3.21 Presser-foot pressure stepping motor ............................................................................................. 83
4.3.22 Stitch-width stepping motor ............................................................................................................. 84
Chapter 5 - Adjustments ................................................................................................ 85
5.1 Belt Tensions ..................................................................................................................... 85
5.1.1 Vertical shaft-/base shaft belt tension ............................................................................................... 85
5.1.2 Drive motor belt tension..................................................................................................................... 86
5.1.3 Hook drive belt tension .................................................................................................... 87
5.2 Head-frame plate position .................................................................................................. 88
5.2.1 Position of head-frame plate/stitch plate in Y-direction ..................................................................... 88
5.2.1 Position of head-frame plate/stitch plate in Y-direction ..................................................................... 88
5.2.2 Position of head-frame plate/stitch plate in X-direction ..................................................................... 89
5.3 Presser-foot adjustment ..................................................................................................... 90
5.3.1 Darning foot height .......................................................................................................... 90
5.3.2 Presser-foot fixation ........................................................................................................................... 91
5.4 Needle settings................................................................................................................... 92
5.4.1 Distance between needle bar and presser-foot bar .......................................................................... 92
5.4.2 Needle distribution ............................................................................................................................. 93
5.4.3 Zigzag stitch width limiter .................................................................................................................. 94
5.5 Hook, needle drive and feed-dog movement timing ............................................................ 94
5.5.1 Feed-dog lift movement (base shaft and main shaft timing) ............................................................. 94
5.5.2 Base shaft-/load lock screw distance ................................................................................................ 95
5.5.3 Loop lift .............................................................................................................................................. 96
5.5.4.1 Needle penetration in Y directions ................................................................................................. 98
5.5.5 Needle height .................................................................................................................................... 99
5.5.5.1 Needle height without basting device ........................................................................................... 100
5.6 Presser-foot settings ........................................................................................................ 101
5.6.1 Main feed-dog horizontal position ................................................................................................... 101
5.6.2 Main feed-dog height 0.9-1.0mm .................................................................................................... 101
5.6.3 Main feed-dog Position within stitch plate in X-direction. ................................................................ 103
5.6.4 Main feed mechanical balance - basic setting................................................................................. 104
5.6.5 Upper feed (Dual Feed)-/main feed synchronization (pinning position) .......................................... 105
5.6.6 Upper feed-dog (Dual Feed) mechanical balance - Basic setting .................................................. 106
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