I have the PE770 too. I use the needle threader occasionally, but most of the time it seems faster to do it manually. I put a narrow piece of white cardstock behind my needle opening, so I can see the hole better. (Of course not with white thread. On my Janome sewing machine the threader gave out right away, so I had no choice in the matter. Thank goodness my eyesight is not too bad. I am sorry, that I can't help you otherwise. I have e-mailed Brother before with a question and they have been very good answering me . Did you register your machine with them when you got it? If not, let me know and maybe I can do it for you.
Here's a question I have. A week or so ago my Brother PE-770 needle threader stopped working. I've done everything recommended. Needle up, foot down, but no luck. Got any ideas? She's not due for a tune up for a while, so I don't want to bring her in quite yet.[/QUOTE]