toyota 830 bobbin problem

i have a toyota 830 embroidery machine and i dont know why there is not bottum bobbin thread. Any advice on all possibility would be great. Thanks

What do you mean there is no bottom thread??? If there is no bobbin, the machine should error out and not sew.

Or do you mean that when you flip your design over, there is no bobbin showing on the satin stitches? If that's the case, then it just means that you tension is way too tight.

maybe the sensor is turned off. I accidentally did that with my 850, drove me crazy trying to sew something and having to watch for a thread break. Once I figured out what was happening (newbie operator error) the problem went away.