Firstly, have you checked the manual?
if you don't have one go here
http://www.jukihome.com/downloads/manuals/TL98Q_InstructionManual%28ESF%29.pdf
you need to look at page 12/13.
once you have placed the bobbin onto the spool holder (the short metal pin) thread the yarn around the bobbin, then push the long curved bar up against the bobbin where the thread will be wound. If the bobbin is not fitted on the pin correctly and the curved bar won't fit into the slot. The movement of the curved bar disengages the needle and wind the bobbin, the curved arm will move as the bobbin fills and automatically stop.
i hope this helps
As far as I am aware, there is a separate little motor to wind the bobbin, actuated by a micro-switch. If this switch is not functioning the motor won't run.
You can take the machine to a mechanic for a fix if you don't want to take the lid off the machine and check the switch is in the right place or buy a separate bobbin winder for less than the service charge.
Pop an empty bobbin on the thread spool. You need to disengage the motor from the presser foot so that the motor no longer makes the presser foot go up and down, but sends the power to wind a bobbin on the thread spool. Check with your machine's manual, but this is usually done be either pushing in, or popping out a button on the hand wheel. Begin a new thread on the bobbin following the directions either from your manual or as printed on the machine. On my Bernina, I have to push the thread spindle sideways to engage the bobbin winder. Use your foot pedal now and the bobbin will automatically fill up. It should stop when full, then you reverse your actions. eg: push the thread spool back, pop in the button on your hand wheel, insert the bobbin (check with your user manual as to clockwise-anticlockwise, and yes it DOES make a difference!) Re-thread your machine (always with the presser foot up) and make a test stich.
I hope this helps and happy sewing.
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