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8. Interlock is functioned
a) Switch off the main switch, and switch on it again.
b) Press both foot switches.
9. Machine is not original position
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Check the sensor for cloth feed table or needle bar.
10. Stitch length/pitch can’t adjust
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Is the some oils on the surface of brake pad?
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Is the brake pressure adjustment correctly?
11. Skipped stitch or needle thread snaps frequently
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Did all threads thread correctly?
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Did you use correct needle system? (Needle system is “Schmetz” system 558 #90 ~ #120)
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Is there any scratches on the surface of loopers, needle guard, spreaders or throat plate?
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Is there any scratches on the threading hole of each threading guide (check part No. S1-0514,
S1-1953A, S1-2931 or s1-2951)?
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Is the adjustment of looper timing or needle bar height correctly?
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Did you use high quality thread?
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Is the adjustment of needle thread tension correctly?
12. Knife broken frequently
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Is the adjustment of knife pressure correctly
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Is the cutting block worn out?
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Does the hole of knife or the hole under the knife clear?
13. Machine stops suddenly while working
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Does some object go into between the feed table of bed or each gears?