What should I do if the computer embroidery machine is always broken? (2)

Update:07-09-2020
Summary:

1. Cable passing system   a) The thread passing hole, t […]

1. Cable passing system
  a) The thread passing hole, thread passing wheel, thread passing hook, thread clamping piece, upper, middle and lower thread passing, thread take-up lever, thread take-up spring and other thread passing places are rough or have burrs;
  b) There are burrs on the needle chuck and presser foot;
  c) The needle plate holes are rough or have burrs;
2. Rotary hook
  a) Scratches on the hook, or the gap is too large;
  b) There are scratches on the surface of the bobbin case;
  c) The bobbin case and the hook are deformed;
  d) There are scratches on the positioning rod;
  e) Poor lubrication;
3. Parameters (installation location)
  a) The bottom dead center position of the needle bar (172 degrees);
  b) The hook thread hooking amount (196 degrees);
  c) The height of the needle bar (the center of the needle hole is on the inner plane of the hook at 172 degrees);
  d) Take-up time (286 degrees);
4. The pattern is too dense or chaotic.

https://www.chinaembroiderymachine.net/