Brother DA-9280 Instruction Manual page 29

12. TROUBLESHOOTING
Problem
6. Upper and lower threads
are breaking.
7. Broken needles
24
¡
Is the needle bent or is the needle tip broken?
Replace the needle if it is bent or broken.
¡
Is the needle properly installed?
If it is incorrect, install the needle correctly.
¡
Is the needle properly threaded?
If it is incorrect thread the needle correctly.
¡
Is the upper or lower thread tension too weak or too strong?
Adjust the upper thread or lower thread tension.
¡
Is the tension plate clearance of the upper thread nipper incorrect?
Adjust the tension plate clearance of the upper thread nipper cor-
rectly.
¡
Are the needle eyes too small for threads?
Refer to the section on "Needles and threads".
¡
Are the loopers damaged?
Replace loopers with good ones.
¡
Is the material being pushed or pulled with excessive force during
sewing?
¡
Is the needle properly installed?
If it is incorrect, install the needle correctly.
¡
Is the needle bent, is the needle tip broken, or is the needle hole
blocked?
If the loopers are damaged, smooth it with an oiled grindstone or
replace it.
¡
Does the needles hit the loopers?
Adjust timing of loopers running clear of needles.
¡
Does the needles hit the needle guard?
Adjust the needle guard.
¡
Are the needle eyes too small for threads?
Refer to the section on "Needles and threads".
Caution
¡
It is extremely dangerous to leave any pieces of broken needle
sticking in the material. If the needle breaks, search for all pieces
until the whole of the needle is found again.
¡
Furthermore, we recommend that through steps be taken to ac-
count for such needles to comply with product liability regula-
tions.
DA-9280
Possible cause Page
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