Repairing a Brother Charger 651 Sewing Machine?
It sounds to me as though it is a timing issue, i.e., the thread pickup point at the needle eye/thread hook point. The bobbin thread needs to be picked up by the top thread inside the bobbin case at the point where the needle eye is just returning to its upper...
Repairing a Brother Charger 651 Sewing Machine?
There is another possible problem other than timing. On a couple of my old Brother machines the drive shaft on the bobbin winder was very stiff or frozen from infrequent use and no oil. Remove the top cover of the machine (2 screws) and see if the rubber wheel...