22
Upper thread tension adjustment
The standard upper thread tension should be 59 to 67 grams-force when the thread tension
is set at “3.4”, measured with a #50 polyester thread being pulled at approximately 110 mm/
sec. in the direction of arrow.
1. Open the face plate.
2. Turn the power switch ON while pressing the Start/
Stop button and the Reverse stitch button.
Press the “BH Sen Tension” key to select the BH
sensor and tension adjusting mode.
3. Thread #50 polyester thread to the machine.
4. Set the thread tension “3.4” by pressing “3.4” key.
(A) If the thread tension is less than 59 gf, turn the
screw in the direction of “+”.
(B) If the thread tension is more than 67 gf, turn the
screw in the direction of “–”.
Pulling direction: (pulling speed 110 mm/sec.)
Screw
Reverse button
Start/stop button
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