2
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
Rear cover ........................................................................................................................................................ 5
Arm thread guide unit ....................................................................................................................................... 6
Replacing Electronic Components
Changing the printed circuit board A ................................................................................................................ 7
Changing the printed circuit board F and slide volume .................................................................................... 8
Changing the front panel .................................................................................................................................. 9
Changing the LCD unit and LCD supporter plate ........................................................................................... 10
Wiring diagram ................................................................................................................................................11
Mechanical Adjustment
Needle drop position adjustment .................................................................................................................... 12
Backlash between hook drive gear and lower shaft gear .............................................................................. 13
Hook timing adjustment ...................................................................................................................................14
Needle bar height adjustment ........................................................................................................................ 15
Clearance between needle and tip of the rotary hook adjustment (1) ............................................................ 16
Clearance between needle and tip of the rotary hook adjustment (2) ............................................................17
Height and direction of presser bar adjustment ............................................................................................. 18
Feed dog height adjustment ........................................................................................................................... 19
To replace needle thread tension unit ............................................................................................................ 20
Tension release mechanism adjustment ........................................................................................................ 21
Upper thread tension adjustment ................................................................................................................... 22
Bobbin winder stopper adjustment ................................................................................................................. 23
Needle threader hook position ....................................................................................................................... 24
Thread cutter switch adjustment .................................................................................................................... 25
Thread drawing lever height adjustment ........................................................................................................ 26
Automatic upper feed withdrawal rod adjustment .......................................................................................... 27
Automatic upper feed adjustment (1). ............................................................................................................. 28
Automatic upper feed adjustment (2) ............................................................................................................. 29
Upper feed dog (1) .......................................................................................................................................... 30
Upper feed dog (2) ......................................................................................................................................... 31
To replace the thread take-up lever ................................................................................................................ 32
To attach lower shaft ...................................................................................................................................... 33
Synchlo belt .................................................................................................................................................... 34
To replace the brushless DC motor and belt tension adjustment .................................................................. 35
Upper shaft shield plate position .................................................................................................................... 36
Buttonhole lever position adjustment ............................................................................................................. 37
Stretch stitch feed balance adjustment .......................................................................................................... 38
Presser foot lifter stopper position (1) ............................................................................................................. 39
Presser foot lifter stopper position (2) ............................................................................................................ 40
Automatic presser foot lifter initializing sensor position ..................................................................................41
Preseer foot height on needle plate adjustment ............................................................................................. 42
Presser bar lifter switch position .................................................................................................................... 43
To replace and adjust the needle plate sensor switch ................................................................................... 44
To replace the switching power supply unit .................................................................................................... 45
Drop down switch adjustment ........................................................................................................................ 46
Feed dog troubleshooting .............................................................................................................................. 47
Knee lifter adjustment .................................................................................................................................... 48
Optical bottom thread sensor adjustment ...................................................................................................... 49
PARTS LIST ...............................................................................................................................50-75
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