Try taking the thread out of the needle and then through the bobbin thread guides. Then wind the bobbins. I do it on my Viking 835. My machine has another feature to wind while you sew, but I use big spools, so I don't usually have 2 spools. I do however have many, many bobbins and wind a batch - 6 at the beginning of each new quilt. Now all I need is a flashing light when the bobbin thread runs out. I've chained several yards before I noticeed there was no bobbin thread. Daydreaming away....