- 25 -
PR OBLEM
POSSIBLE CAU SE
PAGE
5. Upper and lower threa ds
are break ing
․Is the needle bent or is the needle ti p brok en?
-> Repla ce needl e if it is bent or broken.
9
․Is the needle properl y instal led?
-> If it is incorrect, ins ta ll the needle correctly.
9
․Is the needle properl y threa ded?
-> If it is incorrect threa d the needl e correctly.
10,11
․Is the upper or l ower threa d tens ion too wea k or too
strong?
-> Adjust the upper thread or lower thread tension.
13
․Is the tension plate cleara nce of the upper threa d
nipper incorrect?
-> Adjust the tension pl ate clearance of the upper
threa d nipper correctl y.
20
․Are the needl e ey es too smal l for threa ds?
-> Refer to the section on "Needl es and threads"
9
․Are the l oopers da ma ged?
-> Repla ce l oopers with good ones.
16
6. Brok en needles
․Is the ma teria l being pushed or pull ed with excessive
force during sewing?
․Is the needle properl y instal led?
9
․Is the needle bent, is the needle tip broken, or is the
needle hole block ed?
-> Replce the needle.
9
․D oes the needles hit the loopers ?
-> Adjust timing of loopers running clear of needl es .
16
․D oes the needles hit the needle gua rd?
(In case of fixed needle guard)
-> Adjust the needl e guard.
18
․Are the needl e ey es too smal l for threa ds?
-> Refer to the section on "Needl es and threads"
9
Summary of Contents for DT6-H892?3
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