typical GC6760 SERIES, Руководство по установке, инструкции и обслуживанию

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TYPICAL GC6760 Series
11/9 Lower thread builds knots not the beginning / Bobbin spins when thread is cut
Knots on the beginning of the seam or the spinning of the
bobbin when the tread is cut can have various reasons.
1. Check if the bobbin is turning the right way
when you pull the tread.
2. Check if there is to much thread on the bobbin.
It should be only filled to 80 % of the bobbin capacity.
3. Check if the break spring is fitted.
4. Check if the bobbin turns freely.
Replace bobbin if necessary.
11/10 Upper and lower thread breakage
Upper and lower thread breakage can have various reasons.
1. Check if the needle is bend or the point of the needle is
damaged.
2. Check if the needle is put in the right way.
3. Check if the machine is threaded the right way.
4. Check if the hook is lubricated properly. When the oil level
is on the last line refill oil.
5. Check the upper and lower thread tension. It maybe to
tight or to loose.
6. Check the way of the take up spring. In case the operating
distance is too small, the tension can be to loose.
7. Check if there is damage to the hook, feed dog or any
other parts.
8. Check if the thread path is damaged. Is this the case
polish the thread path with fine sandpaper or replace the
damaged part.
11 // ERROR MESSAGES & POSSIBLE TROUBLESHOOTING