Baby Lock Serger Model #BL-402
SOURCE: Baby Lock Protege BL5370Ed Serger
I was in a similar position (but had the manual). The manual isn't as complete as I'd like. Anyway, what finally got mine working were the following:
1. turn all tensions to zero before putting thread through them
2. thread the upper looper, then lower looper, then needles.
3. when threading the lower looper (mine kept pulling out), after passing the thread through the looper eye, it needs to go pretty much straight up, not wrapping around anything else - other thread, for example. Mine was at one point trying to wrap itself around a post.
4.when everything is all threaded up, make sure all threads are under the foot *and* pulled to the left (even though the manual says pull to the back). Then chain off without fabric, turning the handwheel by hand to make sure loops are forming. If so, adjust tensions to where you think they should be (mine are currently all between 2 and 5), and add fabric. Then tweak as needed.
For me, this was a lot of trial & error, hair-pulling, and getting tips 1, 2, and 4. I figured out #3 on my own, with much swearing along the way. Good luck!
LF
SOURCE: need a Baby Lock serger manual for a 526OD 4/3/2 thread differential feed machine
contact babylock customer service about a manual
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