Upper Thread Tension - Janome MC8900 QCP Service Manual

Upper thread tension

The standard upper thread tension should be 75 to 90 grams when pulling the thread (while polyester thread size 50)
at the speed of 110 mm/sec with the tension at "AUTO" (Be sure the presser foot is lowered).
Thread tension dial
Thread tension dial
adjusting screw
Pulling direction: (pulling speed 110 mm/sec.)
Mechanical adjustment
22
1 Set the thread tension dial to "AUTO".
2 Open the face cover.
Adjust the tension by turning the thread tension
adjusting screw.
To loowen the tension, turn it clockwise (in the direction
of "–").
To tighten the tension, turn it counter clockwise (in the
direction of "+").