Brother S-1110A Instruction Manual download pdf (Page 31)

S-1110A

11. TROUBLESHOOTING

Problem Possible cause Page

9 Lower thread is tangled at

the sewing start.

y 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.

y Is there too much thread

wound onto the bobbin?

The bobbin winding

amount should not be

more that 80 %.

y Is the bobbin turning smoothly?

If the bobbin is not turning smoothly, replace the bobbin.

10 Upper and lower threads

are breaking.

y Is the needle bent or is the needle tip broken?

Replace the needle if it is bent or broken.

y Is the needle properly installed?

If it is incorrect, install the needle correctly.

y Is the machine properly threaded?

If it is incorrect, thread the thread correctly.

y Is the upper or lower thread tension too weak or too strong?

Adjust the upper thread or lower thread tension.

y 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.

y Is the rotary hook, feed dog or other part damaged?

If they are damaged, smooth them with an oiled grindstone or

replace the damaged parts.

y Is the thread path damaged?

If the thread path is damaged, smooth it with sandpaper or

replace the damaged part.

16*

11 Broken needles y Is the material being pushed or pulled with excessive force during

sewing?

y Is the needle properly installed?

If it is incorrect, install the needle correctly.

y Is the needle bent, is the needle tip broken, or is the needle hole

blocked?

Replace the needle.

y Is the needle and rotary hook timing correct?

Adjust the height of the needle bar.

Adjust the clearance between the needle and the tip of the

rotary hook.

y Is the needle timing too advanced with respect to the feed dog?

Retard the needle timing.

y 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.

y Furthermore, we recommend we recommend that through

steps be taken to account for such needles to comply with

product liability regulations.

19*

20*

19*

Lower

thread

0751M

0471M

2124M

Caution

0469M

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Brother S-1110A Instruction Manual Page 31

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