4. ADJUSTMENT
HE-800A
100
4-18. Adjusting the thread tension at the tack tension control
1. Turn on the power and set the sewing machine to
the home position. Then press the RESET key to
lower the work clamp.
2. Loosen the set screw (1), and then adjust the
clearances between the tension release cam (2)
and the tension release pin (3) as shown in the
illustration.
3. Press the RESET key and check that the tension
disc opening amount is 0.5-1.0 mm when the
work clamp is raised.
4. Press the RESET key once more and check that
the tension discs are fully closed when the work
clamp is lowered.
4-19. Adjusting the thread tension at the zigzag tension control
Position the tension release solenoid as described
in "3-7. Tension release mechanism (1)" before
carrying out this adjustment.
1. Turn on the power and set the sewing machine to
the home position. Then press the RESET key to
lower the work clamp.
2. Loosen the set screw (1), and then move the
tension stud bracket assembly (2) in and out to
adjust so that the tension disc opening amount is
0.5 - 1.0 mm.
3. Check that the tension discs are fully closed when
the power is turned off.
4357Q
4358Q
