Brother S-7200C Bedienerhandbuch PDF herunterladen (Seite 72)

S-7200C

14. TROUBLESHOOTING

Problem Possible cause Page

8 Material slippage y Is the presser foot pressure too strong?

Adjust the presser foot pressure.

9 Lower thread is tangled at

the sewing start.

Spinning of bobbin during

thread trimming

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 than 80 %.

y Is the anti-spin spring attached?

Attach the anti-spin spring.

y Is the bobbin turning smoothly?

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

y Is a bobbin other that the light-alloy bobbins specified by Brother

being used?

Use only bobbins which are specified by Brother.

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 rotary hook sufficiently lubricated? (-[]0[], []3[] specifications)

If the oil gauge is down to the lower reference line in the oil

gauge window, add more oil.

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.

56*

11 Incorrect thread trimming

(Upper and lower threads

are both not being

trimmed)

y Is the fixed knife or movable knife damaged or worn?

Replace the fixed knife or the movable knife.

12 Incorrect thread trimming

(Upper thread or lower

thread is not being

trimmed)

y Is the needle properly installed?

If it is incorrect, install the needle correctly.

y Is the fixed knife or movable knife blunt?

Replace the fixed knife or the movable knife.

0471M

Lower

thread

0751M

2124M

0750M

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