11. TROUBLESHOOTING

Problem

 

 

Cause

 

 

 

Remedy

 

Page

 

 

 

 

 

 

 

Upper thread is not cut.

Knife is blunt.

 

 

Replace with a new knife.

 

51

 

 

 

 

 

 

 

 

 

Knife does not move to the full

 

 

 

 

 

 

stroke because air pressure is too

Adjust the air pressure.

 

51

 

 

weak.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Upper thread trimmer knife is not

Install the upper thread trimmer

 

 

 

knife so that it cuts only one side

53

 

 

picking up the upper thread.

 

of the upper thread loop.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Movable knife is not picking up

Refer to the remedies given under

 

 

 

the needle thread because the

“Skipped stitches occur” in this

58

 

 

last stitch is being skipped.

 

troubleshooting chart.

 

 

 

 

 

 

 

 

 

 

 

 

Movable

knife

position

is

Adjust the position of the movable

53

 

 

incorrect.

 

 

 

knife or the loop spreader.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lower thread is not cut.

Knife is blunt.

 

 

Replace with a new knife.

 

51

 

 

 

 

 

 

 

 

 

Knife does not move to the full

 

 

 

 

 

 

stroke because air pressure is too

Adjust the air pressure.

 

51

 

 

weak.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Movable

knife

position

is

Adjust the position of the movable

53

 

 

incorrect.

 

 

 

knife or the loop spreader.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thread slips out

of the

Thread nipper spring force is too

Adjust the

force of the

thread

53

needle at the

sewing

weak.

 

 

 

nipper spring.

 

 

 

 

 

 

start.

 

Upper thread length is too short

Install the upper thread trimmer

 

 

 

 

 

 

knife so that it cuts only one side

53

 

 

after trimming.

 

 

of the upper thread loop.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Needle and looper adjustment is

Adjust the

needle bar height or

43

 

 

incorrect.

 

 

 

the looper and spreader height.

 

 

 

 

 

 

 

 

 

 

 

 

 

Not enough upper thread is being

Adjust the amount of upper thread

45

 

 

fed out.

 

 

 

being fed out.

 

 

 

 

 

 

 

 

 

 

 

 

 

Material is not being cut

Cutting pressure is too weak.

 

Adjust the cutting pressure so that

51

cleanly.

 

 

 

 

 

it is strong enough.

 

 

 

 

 

 

 

 

 

 

 

 

 

Knife and cutting block are not

Grind the cutting block surface.

50

 

 

contacting properly.

 

 

 

 

 

 

 

 

Knife is blunt.

 

 

Replace with a new knife.

 

51

 

 

 

 

 

 

 

 

 

 

Cutter arm operation time is too

Make the operation time longer by

 

 

 

changing

the memory

switch

49

 

 

short.

 

 

 

setting.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RH-9800

59

Page 64 Page 66
Page 65
Image 65
Brother DH4-B980 Problem, Remedy Upper thread is not cut, Lower thread is not cut, Thread slips out, Needle at, Start
Page 64 Page 66

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