Upper thread is too tight; Upper thread is too loose- Page 116

OTHER BASIC PROCEDURES 

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114

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Upper thread is too tight

The tension of the upper thread is too tight, 
resulting in the bobbin thread being visible from 
the right side of the fabric.

1

Right side

2

Wrong side

Turn the knob in the direction of the arrow to 
decrease the tension of the upper thread.

1

Red line

If the red line is visible, the thread tension 
cannot be decreased any further. Increase the 
tension of the bobbin thread. For details, refer to 
page 112.

Note

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If you decrease the thread tension further 
than the red line, the tension knob may be 
dis-assembled.

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If necessary, refer to page 249 for 
reassembling the tension unit.

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Upper thread is too loose

The tension of the upper thread is too loose, 
resulting in a loose upper thread, loose thread 
locks or loops appearing on the right side of the 
fabric.

1

Right side

2

Wrong side

Turn the knob in the direction of the arrow to 
increase the tension of the bobbin thread.