Brother 884-T13 Operation Manual page 128

■ 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 124.
Note
• If you decrease the thread tension further
than the red line, the tension knob may be
disassembled.
• If necessary, refer to page 287 for
reassembling the tension unit.
126
■ 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.