CONTENTS
What to do when ................................................................................................................................ 1 - 3
Face Cover ............................................................................................................................................. 4
Bed Cover .............................................................................................................................................. 5
Free-arm Cover ...................................................................................................................................... 6
Front Cover ............................................................................................................................................. 7
Rear Cover ............................................................................................................................................. 8
Presser Bar Height ................................................................................................................................. 9
Needle Drop Position ............................................................................................................................ 10
Needle to Hook Timing ......................................................................................................................... 11
Needle Bar Height ................................................................................................................................ 12
Feed Dog Height .................................................................................................................................. 15
Needle Swing Timing ............................................................................................................................ 16
Needle Thread Tension ......................................................................................................................... 17
Stretch Stitch Feed Balance ................................................................................................................. 18
Location of the Connectors .................................................................................................................. 20
Self Diagnostic Tests ..................................................................................................................... 21 - 25
Circuit Board-A ..................................................................................................................................... 26
Driving Motor ........................................................................................................................................ 27
Switching regulator ............................................................................................................................... 28
Stepping motor ( Zigzag ) ..................................................................................................................... 29
Stepping motor ( Feed ) ........................................................................................................................ 30
Oiling .................................................................................................................................................... 31