vii4. Adjustment ..........................................................................................4 - 1Needle curvature ...............................................................................................4 - 2Tip damage to needle ........................................................................................4 - 3Starting test mode ..............................................................................................4 - 4Timing belt tension adjustment ..........................................................................4 - 6Motor belt tension adjustment ............................................................................4 - 7Needle bar rise adjustment ................................................................................4 - 8Needle bar height adjustment ............................................................................4 - 9Three point needle drop adjustment ................................................................4 - 10Needle interference left/right adjustment .........................................................4 - 11Clearance between the needle and the rotary hook point adjustment .............4 - 12Presser bar height and parallel adjustment .....................................................4 - 13Fine tension adjustment ...................................................................................4 - 14Upper thread tension adjustment .....................................................................4 - 15Inner rotary hook (lower thread) tension adjustment .......................................4 - 16Feed adjustment ..............................................................................................4 - 17Bobbin winder (uneven bobbin winding and bobbin winding amounts) adjustment .....4 - 18BH lever switch position adjustment ................................................................4 - 19Forward and back adjustment of needle and presser ......................................4 - 20Knee lifter adjustment ......................................................................................4 - 21Side feed line adjustment ................................................................................4 - 22One-point pattern adjustment ..........................................................................4 - 23Left and right feed dog position adjustment .....................................................4 - 24Release adjustment .........................................................................................4 - 25Front/back, left/right position of feed dog adjustment ......................................4 - 26Feed dog height adjustment ............................................................................4 - 27Inner rotary hook bracket position adjustment .................................................4 - 28Adjust the needle thread block ........................................................................4 - 295. Failure Investigation for Electronic Parts .........................................5 - 1Error message list ..............................................................................................5 - 2Power does not come on ...................................................................................5 - 3Pulse motors do not return to starting point .......................................................5 - 4Pattern cannot be selected ................................................................................5 - 5Main motor does not turn ...................................................................................5 - 6Main motor rotation abnormal ............................................................................5 - 8
