Reliable MSK-1341B - Manual (Page 11)

25.T r o u b le s hooti n g
1.Thread breakage
(thread wear and
tear)
2 . S k ip st i t c h
3 . L o o s e sti t c h
Trouble Causes Solution
① Threading course,needle tip, hook blade
tip or thread passing groove on the throat
plate is rough.
② Too large needle thread tension.
③ Too big clearance of inner hook guide.
④ collision between needle and hook guide
tip.
⑤ Too small needle thread tension.
⑥ TOOlarge or too small stroke thread take
-up spring tension
⑦ Not timing between needle and hook.
① Too big clearance between needle and
the tip of inner hook blade.
② Not timing between needle and hook.
③ Too small pressure on the outer presser
foot.
④ the height of needle bar is not enough.
⑤ No effect of needle guard plate.
⑥ Wrong needle size.
⑦ Wrong needle threading.
⑧ Rotary hook is scraped.
① The thread passing parts are not smooth.
② the bobbin cannot rotate smoothly.
③ Too big clearance of inner hook guide.
④ Too weak tension of bobbin thread.
⑤ too tighten when winding bobbin thread.
⑥ bobbing thread doesn't pass the thread
tension spring on the bobbin case
Get rid of the burr on the hook blade tip
and polish the thread passing groove on
the throat plate with fine emery cloth.
Adjust the needle thread to proper tension.
Decrease the clearance,refer to21.
Adjusting the inner hook guide.
Rdfer to 19. Adjusting the needle and
hook.
Adjust the needle thread to proper tension.
Decrease the tension of thread take-up
Spring and increase the spring stroke.
Refer to 19. Adjusting the needle and hool.
Refer to 19.Adjusting the needle and hook.
Refer to 19.Adjusting the needle and hook.
Tighten the pressure screw.
Refer to 19.Adjusting the needle and hook.
Refer to 20.Adjusting the needle guard
plate.
Change a proper needle.
Refer to 12.Threading the needle thread.
Get rid of the burr on the hook guide tip
with fine emery cloth.
Polish them with fine emery cloth.
Reset the bobbin and rotary hook.
Refer to 21. Adjusting the inner hook
guide.
Adjust the bobbin thread tension properly.
Decrease the tension when winding.
Threading the bobbin thread correctly.