Upper thread breaking on pe 780D embroidery machine

SOURCE: thread breaking.

Have you tried to change needle?

SOURCE: Brother PE-150V bobbin thread

For embroidery, and zig-zag, and because the needle makes side movements, it needs more needle thread.
So try to keep you needle thread not very tight,
and tight up your bobbin case tension more, so that the two threads meet under the meterial.

SOURCE: brothers pe150 embroidery machine will not sew

If you tighten up your needle thread, reduce the tension of the needle thread.
For embroidery, and zig-zag, and because the needle makes side movements, it needs more needle thread.
So try to keep you needle thread not very tight,
and tight up your bobbin case tension more, so that the two threads meet under the meterial.

SOURCE: Brother 925D - threads do not lock

threads do not overlock stich

SOURCE: SETTING THE TIMING ON DISNEY BROTHER PE-180D EMBROIDERY MACHINE

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Testimonial: "although this was very helpful i decided to take it to a shop and let them sort it out thanks for the help"