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The needle may be slightly bent. Try changing the needle.
Check also to see if the throat plate has moved slightly due to vibration. Unscrew it, take it off, clean around it, clean any lint under it, then reinstall.

Juki Sewing... | 32 views | 1 helpful votes


Mary Dunn Mar 30, 2019
Well, I had a similar problem and the only thing that did work was the tissue paper. I am 75 and have been sewing and teaching since I was 14.

Juki Sewing... | 33 views | 0 helpful votes


Not fully understanding the issue but probable uneven feed of top thread from spool. Review threading instructions.
https://www.i3detroit.org/wi/images/1/1e/JUKI_DDL-8300N_Instruction_Manual.pdf


What's your experience and history with this machine? Attach a photo of problem, if possible.

Juki Sewing... | 32 views | 0 helpful votes


Set the top tension to four. Now, if the bottom seems too loose go ahead and loosen the bobbin tension a little at a time. If your upper tension isn't real true at four you may have to slightly raise the tension control to offset this.

Juki Sewing... | 46 views | 0 helpful votes


RETURN IT TO PLACE YOU BOUGHT IT

Juki Sewing... | 44 views | 0 helpful votes


The timing is off, you need the timing re-done!

Is that ASAP enough.

Also check that the lower bobbin is correctly inserted, holder and bobbin.

Juki Sewing... | 41 views | 0 helpful votes


TRY ASKING GOOGLE.COM OR YOUTUBE SEARCH

Juki Sewing... | 43 views | 0 helpful votes


Be sure that your needle size is not too small for the thread you are using , thicker thread, thicker needle or a top stitching needle

Juki Sewing... | 42 views | 0 helpful votes


Take it to a service centre for cleaning, service and checking the timing. Your foot pedal also needs cleaning inside.

Juki DDL-5550... | 45 views | 0 helpful votes


I believe you can press the button, even when red, and it will advance one stitch? yes/no... I'm not sure.

You were able to bring bobbin thread to top?

Juki Sewing... | 35 views | 0 helpful votes


I wasnt able to locate the sv-500 but juki but from the others I read its a head position detect failure.


Disconnection of synchronizer connector

(no signal from head position synchronizer)

Check the synchronizer connector (CN33)

So likely a common cause is a connector for the cable that comes from head to control board.

Juki Sewing... | 59 views | 0 helpful votes

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