Brother S-7300A-403P - Thread Tension Adjustment; Achieving Good Even Stitches; Lower and Upper Thread Tension Adjustment

S-7300A
9. THREAD TENSION
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9. THREAD TENSION
9-1. Adjusting the thread tension
CAUTION
Turn off the power switch before removing or inserting the bobbin case.
The machine may operate if the treadle is depressed by mistake, which could result in injury.
Good even stitches
Upper thread
Lower thread
Upper thread tension too weak
Lower thread tension too strong
Increase the upper thread tension.
Decrease the lower thread tension.
Upper thread tension too strong
Lower thread tension too weak
Decrease the upper thread tension.
Increase the lower thread tension.
<Lower thread tension>
Adjust by turning the adjustment screw (1) until the bobbin
case drops gently by its own weight while the thread end
coming out of the bobbin case is held.
<Upper thread tension>
After the lower thread tension has been adjusted, adjust the
upper thread tension so that a good, even stitch is obtained.
1. Lower the presser foot.
2. Adjust by turning the tension nut (2).
0572M
0573M
0574M
2177M
0903D
Becomes weaker
Becomes stronger
Becomes
weaker
Becomes
stronger