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 (1) .............................................................................. 16
Clearance between needle and tip of the rotary hook (2) ...............................................................................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
To adjust the upper thread tension release (2) ............................................................................................... 22
Adjusting the needle thread tension ............................................................................................................... 23
To adjust the bobbin winder stopper .............................................................................................................. 24
Needle threader hook position ....................................................................................................................... 25
To adjust thread cutter switch ......................................................................................................................... 26
To adjust thread drawing lever ....................................................................................................................... 27
Replacing the thread take-up lever ............................................................................................................... 28
To attach lower shaft. ..................................................................................................................................... 29
Synchro belt ................................................................................................................................................... 30
To replace driving motor and adjust belt tension ............................................................................................ 31
Upper shaft shield plate position .................................................................................................................... 32
Adjusting buttonhole lever position ................................................................................................................ 33
Stretch stitch feed balance ............................................................................................................................. 34
Adjustment of presser bar lifter switch position .............................................................................................. 35
To adjust and replace needle plate sensor switch ......................................................................................... 36
To replace switching power supply................................................................................................................. 37
To replace and adjust drop feed micro switch ................................................................................................ 38
Feed dog troubleshooting .............................................................................................................................. 39
Self diagnosis ............................................................................................................................................40-44
