− 97 −
8. Thread frays.
1. Number of sttches of te sttchng
s too small.
2. Wdth of te sttchng s too wde.
™
Increase the number of sttches of te
sttchng at the end of sewng. (Sew-
ng data
)
™
Narrow the wdth of te sttchng at
the end of sewng. (Sewng data
)
p.63
p.63
9. Length of needle
thread remanng at
the end of sewng s
too long.
1. Wdth of te sttchng s too narrow.
2. Tenson of te sttchng s too low.
™
Wden the wdth of te sttchng at the
end of sewng. (Sewng data
)
™
Increase tenson at the end of sew-
ng. (Memory swtch data
)
p.63
p.77
10. N e e d l e t h r e a d
breaks at the start
of sewng, or the
wrong sde of seam
s drty.
1. Tenson at the start of sewng s too
low.
™
Increase tenson at the start of sew-
ng. (Sewng data
)
p.77
11. Knfe drops even
when needle thread
s cut.
1. Thread breakage detecton plate s
mproperly adjusted.
™
Adjust the detector plate.
(Refer to the Engneer's Manual.)
12. Needle breaks.
1. Needle s bent.
2. Needle comes n contact wth the
blade pont of hook.
3. Needle thread trmmer comes n
contact wth needle when t opens.
4. Needle does not come to the
center of the needle hole of throat
plate.
5. Needle stop poston s low and
the needle comes n contact wth
the needle thread trmmer when t
closes.
™
Replace the needle.
™
Adjust the needle-to-hook tmng.
™
Adjust the nstallng poston of nee-
dle thread trmmer.
™
Re-adjust the nstallng poston of
throat plate base.
p.30
p.88
p.89
13. Knfe drops plural
tmes.
1. Cloth cuttng knfe s not set to the
plural tmes moton settng.
™
Release the plural tme settng.
p.76
14. Ar blows from pre-
set.
1. Blower motor s rotatng n the
reverse drecton.
™
Change the drecton of rotaton of
the motor.
p.5
15. Preset does not
move even when
s t a r t s w t c h s
pressed.
1. Cloth s not detected snce t s
coarse.
™
Release the cloth detecton. (Memory
swtch data
)
p.77
16. C l o t h s f o l d e d
when cloth s delv-
ered from preset to
carrage.
1. Ar blow s excessvely hgh or low.
™
Adjust the ar blow.
™
Clean the air filter.
p.25
17. Cloth slps when
cloth s delvered
from preset to car-
rage.
1. Vacuum force s excessvely low.
2. Clamp force s excessvely low.
™
Adjust the cloth sucton force of the
vacuum.
™
Adjust the clamp.
p.28
p.35 to
37
Troubles
Causes
Correctve measures
Page
