I have no problem with my serger at all. I did struggle at first with threading the lower looper correctly where it goes under the needle plate, but now that I know how to do it, the machine works wonderfully.Â
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Check here (It's a Janome forum):Â http://content.janome.com/fusetalk/forum/messageview.cfm?catid=15&threadid=4306&enterthread=y
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Here is a place to download the manual (read the posts before downloading)
http://content.janome.com/fusetalk/forum/messageview.cfm?catid=15&threadid=3070
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Once the machine is properly threaded, the best thing to do when changing the thread color is to do the following:
1) turn the tension dials to 0
2) pull the thread chain all the way through till you just have threads coming through the needles and there isn't any more chaining for 4-5 inches
3) cut the chain part off
4) snip the old thread right above the spool
5) tie the new thread on with a single knot
6) remove the two needle threads from the eye of the needle
7) and then pull the new thread right through the same path the old thread was in
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All you have to do after that is re-thread the needles. It's a lot faster and less frustrating than trying to thread all 4 pathways every time you change the thread or load a new spool
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I hope this helps. 
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Trisha