Brother DB2-B727 Instruction Manual page 77

Problem
11. Broken needles
¡
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?
Replace the needle.
¡
Is the needle and rotary hook timing incorrect?
Adjust the height of the needle bar.
Adjust the needle and rotary hook timing.
¡
Is the needle timing advanced too far with respect to the feed dog?
Retard the needle timing.
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.
0469M
Possible cause
DB2-B727, B728
12. TROUBLESHOOTING
Page
–
18
–
35
38
36
59