INDEX
Changing external parts
Face plate ......................................................................................................................................................... 1
Top cover .......................................................................................................................................................... 1
Belt cover ......................................................................................................................................................... 2
Base ................................................................................................................................................................. 2
Power supply cover .......................................................................................................................................... 3
Thread cutter cover .......................................................................................................................................... 3
Front cover ....................................................................................................................................................... 4
Thread guide coverr ......................................................................................................................................... 5
Arm thread guide (unit) ..................................................................................................................................... 6
Replacing Electronic Components
Changing the printed circuit board A ................................................................................................................ 7
Changing the printed circuit board K ................................................................................................................ 8
Changing the printed circuit board F and slide volume .................................................................................... 9
Changing LCD ................................................................................................................................................ 10
Wiring diagram ................................................................................................................................................11
Mechanical Adjustment
Needle drop position ...................................................................................................................................... 12
Backlash between hook drive gear and lower shaft gear .............................................................................. 13
Hook timing .................................................................................................................................................... 14
Adjustment of needle bar height .................................................................................................................... 15
Clearance between needle and tip of the rotary hook ................................................................................... 16
Clearance between needle and tip of the rotary hook ................................................................................... 17
Adjustment of height and direction of presser bar ......................................................................................... 18
To adjust the feed dog height ......................................................................................................................... 19
To replace needle thread tension unit ............................................................................................................ 20
To adjust the upper thread tension release (1) .......................................................................................... 21-22
Adjusting the bobbin thread tension ............................................................................................................... 23
To adjust the bobbin winder stopper .............................................................................................................. 24
Needle threader hook position ....................................................................................................................... 25
Thread cutter switch ....................................................................................................................................... 26
To adjust thread drawing lever ....................................................................................................................... 27
Upper feed dog ........................................................................................................................................ 28-31
Thread take-up lever phase. .......................................................................................................................... 32
Lower shaft ..................................................................................................................................................... 33
Timing belt ...................................................................................................................................................... 34
To replace driving motor ................................................................................................................................. 35
Upper shaft shield plate position) ................................................................................................................... 36
Adjusting buttonhole lever position ................................................................................................................ 37
Stretch stitch feed balance ............................................................................................................................. 38
Adjustment of presser bar lifter switch position .............................................................................................. 39
Needle plate sensor switch ............................................................................................................................ 40
Switching power supply .................................................................................................................................. 41
Drop feed micro switch ................................................................................................................................... 42
When the feed dog does not return to “UP” position ...................................................................................... 43
Self diagnosis ............................................................................................................................................44-48
