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Z-8550A, 8560A
14. TROUBLESHOOTING
112
Problem Possible cause Page
9 Lower thread is tangled at
the sewing start.
Spinning of bobbin during
thread trimming
• Is the bobbin spinning direction correct when the lower thread is
being pulled?
Set the bobbin so that it turns in the opposite direction to the
rotary hook.
• Is there too much thread
wound onto the bobbin?
The bobbin winding amount
should not be more than
80 %.
• Is the anti-spin spring attached? (8560A)
Attach the anti-spin spring.
• Is the bobbin turning smoothly?
If the bobbin is not turning smoothly, replace the bobbin.
• Is a bobbin other than the light-alloy bobbins specified by Brother
being used? (8560A)
Use only bobbins which are specified by Brother.
Instruction
manual
Instruction
manual
Instruction
manual
Instruction
manual
10 Upper and lower threads
are breaking.
• 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 machine properly threaded?
If it is incorrect, thread the thread correctly.
• Is the rotary hook sufficiently lubricated?
If the oil gauge is down to the lower reference line in the oil
gauge window, add more oil.
• Is the upper or lower thread tension too weak or too strong?
Adjust the upper thread or lower thread tension.
• Is the upper thread may be loose because the thread take-up
spring operating range is too small?
Adjust the position of the thread take-up spring.
• Is the needle and rotary hook timing incorrect?
Adjust the height of the needle bar.
Adjust the clearance between the needle and the rotary hook.
• Is the thread too thick for the needle?
Use the correct needle or the correct thread.
• Is the rotary hook, bobbin case, thread take-up lever or some other
part in the thread path damaged?
Repair the damage, or replace the part with a new one.
Instruction
manual
Instruction
manual
Instruction
manual
Instruction
manual
69
73
76 - 77
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 clearance between the needle and the rotary hook.
• 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 account for such needles to comply with
product liability regulations.
Instruction
manual
73
76 - 77
Lower
thread
0628M
3557M
0471M
Caution
0469M