TABLE OF CONTENTS
To remove face plate and top cover ................................................................................ 1
To remove tbelt cover and machine base........................................................................ 2
To remove auto thread cutter cover ................................................................................. 3
To remove front cover ..................................................................................................... 4
To remove cover............................................................................................................. 5
To remove thread guide.................................................................................................. 6
To remove circuit board “A” and fuse .............................................................................. 7
To remove circuit board “K” ............................................................................................ 8
To remove tcircuit board “F” and speed control lever....................................................... 9
Connection of connectors ............................................................................................. 10
To adjust needle drop ................................................................................................... 11
To adjust hook timing.................................................................................................... 12
To adjust needle bar height ........................................................................................... 13
To adjust clearance between needle and rotary hook .................................................... 14
To adjust backlash between hook drive gear and lower shaft gear ................................ 15
To adjust presser bar (direction and height) .................................................................. 16
To adjust feed dog height ............................................................................................. 17
To remove needle thread tension unit............................................................................ 18
To adjust tension release mechanism (1) ...................................................................... 19
To adjust tension release mechanism (2) ...................................................................... 20
To adjust needle thread tension .................................................................................... 21
To adjust bobbin winder................................................................................................ 22
To adjust needle threader plate..................................................................................... 23
To remove auto-thread cutter (new type) ....................................................................... 24
To remove auto-thread cutter (old type) ......................................................................... 25
To adjust sliding plate position ...................................................................................... 26
To adjust thread supply control lever.............................................................................. 27
Setting position of thread take up lever ......................................................................... 28
To adjust the upper shaft declutch device ...................................................................... 29
Setting positions of parts on lower shaft........................................................................ 30
Setting positions of upper and lower shafts................................................................... 31
To remove DC motor and belt tension adjustment ......................................................... 32
To adjust zigzag timing ................................................................................................. 33
To adjust buttonhole lever position ................................................................................ 34
To adjust stretch stitch feed balance ............................................................................. 35
To adjust presser foot lifter switch position .................................................................... 36
To adjust switch position of auto thread cutter ............................................................... 37
To adjust position of solenoid for upper shaft declutch device........................................ 38
To adjust postion of solenoid for auto thread cutter........................................................ 39
To adjust position of solenoid for bobbin idling prevension lever ................................... 40
Self-diagnosis chart ............................................................................................. 41 – 45
Parts list ............................................................................................................... 46 – 69
