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11. TROUBLESHOOTING
RH-9800
59
Problem Cause Remedy Page
Knife is blunt. Replace with a new knife. 51
Knife does not move to the full
stroke because air pressure is too
weak.
Adjust the air pressure. 51
Upper thread trimmer knife is not
picking up the upper thread.
Install the upper thread trimmer
knife so that it cuts only one side
of the upper thread loop.
53
Movable knife is not picking up
the needle thread because the
last stitch is being skipped.
Refer to the remedies given under
“Skipped stitches occur” in this
troubleshooting chart.
58
Upper thread is not cut.
Movable knife position is
incorrect.
Adjust the position of the movable
knife or the loop spreader.
53
Knife is blunt. Replace with a new knife. 51
Knife does not move to the full
stroke because air pressure is too
weak.
Adjust the air pressure. 51
Lower thread is not cut.
Movable knife position is
incorrect.
Adjust the position of the movable
knife or the loop spreader.
53
Thread nipper spring force is too
weak.
Adjust the force of the thread
nipper spring.
53
Upper thread length is too short
after trimming.
Install the upper thread trimmer
knife so that it cuts only one side
of the upper thread loop.
53
Needle and looper adjustment is
incorrect.
Adjust the needle bar height or
the looper and spreader height.
43
Thread slips out of the
needle at the sewing
start.
Not enough upper thread is being
fed out.
Adjust the amount of upper thread
being fed out.
45
Cutting pressure is too weak.
Adjust the cutting pressure so that
it is strong enough.
51
Knife and cutting block are not
contacting properly.
Grind the cutting block surface. 50
Knife is blunt. Replace with a new knife. 51
Material is not being cut
cleanly.
Cutter arm operation time is too
short.
Make the operation time longer by
changing the memory switch
setting.
49