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CONTENTS
1.Specifications.......................................................................................... 4
2.Troubleshooting...................................................................................... 5
1.Improper tightness of stitches......................................................................... 5
2.Skip stitch ....................................................................................................... 7
3.Thread breakage .......................................................................................... 10
4.Broken or bent needle .................................................................................. 13
5.Improper fabric feed ..................................................................................... 16
6.Disrupted pattern.......................................................................................... 18
7.Improper buttonhole sewing ......................................................................... 21
8.Improper lower thread winding length .......................................................... 22
9.Improper upper threading............................................................................. 23
3.Adjustment of respective parts ............................................................. 24
1.Needle bar position....................................................................................... 24
2.Timing between needle and hook................................................................. 26
3.Clearance between needle and upper plate spring...................................... 28
4.Stitch width ................................................................................................... 29
5.Needle location............................................................................................. 30
6.Needle sideways movement......................................................................... 32
7.Thread tension.............................................................................................. 33
8.Feed dog position......................................................................................... 34
9.Lower thread winding length......................................................................... 36
10.Presser foot height ....................................................................................... 37
11.Needle threader............................................................................................ 38
12.Buttonhole sewing ........................................................................................ 39
13.Feeding amount............................................................................................ 41
14.Clearance between shuttle driver and shuttle hook...................................... 42
15.Belt tension................................................................................................... 43
4.Removal and reassembling of main components................................. 45
1.External panels, etc...................................................................................... 45
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