Bernina 330 Service And Maintenance Manual page 3

5.5 Hook, needle drive and feed-dog movement synchronization .............................................................. 35
5.5.1 Needle drive synchronization (base shaft/main shaft synchronization)......................................... 35
5.5.2 Position of thread-guiding plate and thread-positioning plate........................................................ 35
5.5.3 Hook driver position ....................................................................................................................... 36
5.5.4 Hook driver cam............................................................................................................................. 36
5.5.5 Thread passage ............................................................................................................................. 36
5.5.6 Loop lift........................................................................................................................................... 37
5.5.7 Needle/hook distance .................................................................................................................... 37
5.5.8 Stitch plate needle penetration in Y-direction ................................................................................ 38
5.5.9 Needle height................................................................................................................................. 38
5.6 Feed-dog settings.................................................................................................................................. 38
5.6.1 Feed-dog synchronization (lift and advance timing) ...................................................................... 38
5.6.2 Feed-dog position in stitch plate .................................................................................................... 39
5.6.3 Feed dog height ............................................................................................................................. 39
5.7 Synchronising disc ................................................................................................................................ 40
5.7.1 Position of synchronizing disc........................................................................................................ 40
5.7.2 Mechanical basic setting of balance .............................................................................................. 40
5.8 Threader................................................................................................................................................ 41
5.9 Basic setting of knee-operated presser-foot lifter (FHS)....................................................................... 42
5.10 Thread tension .................................................................................................................................... 42
5.10.1 Thread tension release ................................................................................................................ 42
5.10.2 Thread regulator spring................................................................................................................ 43
5.10.3 Lower thread tension (Basic settings).......................................................................................... 44
5.10.4 Upper thread tension (Basic settings).......................................................................................... 44
5.11 Winder ................................................................................................................................................. 45
Chapter 6 - Service Program..........................................................................................46
Tests in basic Service Program position ..................................................................................................... 46
I. Configuration........................................................................................................................................ 46
II. Speed control calibration .................................................................................................................... 47
III. Calibrating buttonhole foot with slide 3A............................................................................................ 47
IV. Checking of LD display functioning ................................................................................................... 48
V. Checking of foot-control functioning ................................................................................................... 49
VI. Checking of speed-control functioning .............................................................................................. 49
VII. Checking of synchronizing disc signals............................................................................................ 50
VIII. Checking of winder-motor switch .................................................................................................... 50
IX. Checking of Start-/ Stop button SSU................................................................................................. 51
X. Checking of Quick Reverse button..................................................................................................... 51
Tests 1-12.................................................................................................................................................... 52
Test 1 Straight-stitching .......................................................................................................................... 52
Test 2 Balance (adjusting forward/reverse feed) .................................................................................... 52
Test 3 Automatic darning program ......................................................................................................... 53
Test 4 Display of firmware version.......................................................................................................... 53
Test 5 Hour counter ................................................................................................................................ 54
Test 6 Speed calibration ......................................................................................................................... 54
Test 7 Stitch-width stepping motor test................................................................................................... 55
Test 8 The two stepping motors in pinning position................................................................................ 55
Test 9 Stitch-length stepping motor test ................................................................................................. 56
Test 10 Display of active speed .............................................................................................................. 56
Test 11 Display of RPM calibration factor............................................................................................... 57
Test 12 Start/Stop function ..................................................................................................................... 57
Chapter 7 - Lubrication Plan ..........................................................................................58
Chapter 8 - Maintenance Guidelines .............................................................................60
8.1 Purpose of the Maintenance Guidelines ............................................................................................... 60
8.2 Explanatory notes on the stitch- and hour counter ............................................................................... 60
8.3 Maintenance intervals ........................................................................................................................... 60
8.4 Wear-and-Tear-Parts Definition ............................................................................................................ 61
8.4.1 Non-hour-related parts................................................................................................................... 61
8.4.2 Hour-related parts .......................................................................................................................... 62
BERNINA International AG · Seestrasse 161 · CH-8266 Steckborn · Switzerland
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