vi
Needle curvature ...............................................................................................4 - 2
Tip damage to needle ........................................................................................4 - 3
Test Mode...........................................................................................................4 - 4
Motor belt tension adjustment ............................................................................4 - 5
Needle-presser module and feed module left-right position alignment ..............4 - 6
Timing belt tension adjustment ..........................................................................4 - 7
Needle bar rise adjustment ................................................................................4 - 8
Needle bar height adjustment ............................................................................4 - 9
Needle interference left/right adjustment. ........................................................4 - 10
Cassette threading height adjustment .............................................................4 - 11
Shuttle return timing adjustment ......................................................................4 - 12
Upper thread tension adjustment .....................................................................4 - 13
Feed adjustment ..............................................................................................4 - 14
Presser bar height and parallel adjustment .....................................................4 - 15
Clearance between the needle and the rotary hook point adjustmen ..............4 - 16
Inner rotary hook (bobbin thread) tension adjustment .....................................4 - 17
Bobbin winder
(uneven bobbin winding and bobbin winding amounts) adjustment ................4 - 18
Front/back, left/right position of feed dog adjustment ......................................4 - 19
Feed dog height adjustment ............................................................................4 - 20
Inner rotary hook bracket position adjustment .................................................4 - 21
Forward and back adjustment of needle and presser. .....................................4 - 22
Adjust the needle thread block ........................................................................4 - 23
BH lever switch position adjustment ................................................................4 - 24
5. Failure Investigation for Electronic Parts .........................................5 - 1
Error code list .....................................................................................................5 - 2
Power cannot be turned on ................................................................................5 - 3
Pulse motors do not return to starting point .......................................................5 - 4
Pattern cannot be selected ................................................................................5 - 5
Main motor does not turn ...................................................................................5 - 6
Main motor does not turn ...................................................................................5 - 7
Main motor rotation abnormal ............................................................................5 - 8
Cannot sew pattern well ....................................................................................5 - 9
Cannot sew button holes well. .........................................................................5 - 10
Problems with vertical needle movement and backstitching ...........................5 - 11
Does not operate when the foot controller is used. .........................................5 - 12
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