Brother BAS-342G PS - Thread Tightening and Timing Issues

13. TROUBLESHOOTING
BAS-342G PS
73
Problem Cause Remedy Reference
Movable knife is not cutting cleanly. Replace with a new one. P. 62
Fixed knife is not cutting cleanly.
Sharpen the fixed knife or replace it
with a new one.
P. 62
Adjust the position of the movable
knife.
P. 59
Movable knife is not picking up the
upper thread.
Adjust the needle bar lift amount. P. 57
Movable knife is not picking up the
upper thread because the last stitch is
being skipped.
Refer to "Skipped stitches occur". P. 72
Movable knife position is incorrect.
Adjust the position of the movable
knife.
P. 59
Sub tension is too weak.
Turn the sub tension nut to adjust the
tension.
P. 24
Thread trimming air cylinder speed is
too slow.
Adjust the speed of the thread trimming
air cylinder.
P. 11
Upper thread is not
trimmed.
Thread trimming air cylinder operation
timing is too delayed.
Advance the operation timing for the
thread trimming air cylinder.
P. 35
Incorrect tightening of the upper thread. Adjust the upper thread tension. P. 24
Poor stitch finish on
underside of material.
Upper thread trailing length is uneven. Adjust the sub tension. P. 24
Upper thread tension is too weak. Adjust the upper thread tension. P. 24
Lower thread tension is too weak. Adjust the lower thread tension. P. 24
Thread take-up spring tension and
height are incorrect.
Adjust the tension and height of the
thread take-up spring.
P. 55
Position of arm thread guide R is
incorrect.
Adjust the position of arm thread guide
R.
P. 56
Intermittent height of intermittent
presser foot is too low.
Adjust the intermittent height of the
intermittent presser foot.
P. 32
Upper thread does not release
correctly from hook stopper.
Adjust the overlapping amount for the
inner rotary hook and hook stopper.
P. 58
Feed timing is too fast. Retard the feed timing.
*
Select the correct needle hole plate.
*
Smooth the thread path.
*
Select the correct intermittent presser
foot.
*
Upper thread forms the seam poorly.
Increase the thickness of the feed
plate.
*
Incorrect tightening of
the thread.
Thread scraps and dust in rotary hook.
Clean away the thread scraps and
dust.
P. 53