CONTENTS
What to do when ................................................................................................................................ 1 - 3
SERVICE ACCESS
Face Cover ............................................................................................................................................. 4
Bed Cover .............................................................................................................................................. 5
Free-arm Cover ...................................................................................................................................... 6
Front Cover ............................................................................................................................................. 7
Rear Cover ............................................................................................................................................. 8
MECHANICAL ADJUSTMENT
Presser Bar Height ................................................................................................................................. 9
Needle Drop Position ............................................................................................................................ 10
Needle to Hook Timing ......................................................................................................................... 11
Needle Bar Height ................................................................................................................................ 12
Clearance between Needle and Hook Point ......................................................................................... 13
Backlash ( Lower Shaft Gear ).............................................................................................................. 14
Feed Dog Height .................................................................................................................................. 15
Needle Swing Timing ............................................................................................................................ 16
Needle Thread Tension ......................................................................................................................... 17
Stretch Stitch Feed Balance ................................................................................................................. 18
Adjust the Buttonhole Lever Position .................................................................................................... 19
REPLACING THE ELECTRONIC COMPONENTS
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
Содержание NH40
Страница 1: ...SERVICE MANUAL MODEL NH40...
