12
Replacing electronic components
Thread tension unit
NOTE:
Do not disconnect  connectors by pulling on cord.
To disconnect the connectors, grasp the connector, 
not the cord.
To remove:
1. Remove the belt cover and the top cover (see page 1 
  and 2).
2. Remove the front cover (see page 5).
3. Disconnect the thread tension motor connector from 
  the printed circuit board A (see page 8).
4. Remove the setscrews (A) and (B).
  Remove the thread tension (unit).
To attach:
1. Follow the above procedure in reverse.
2. Check the upper thread tension (see page 21).
Setscrew A
Setscrew B