Bedienungsanleitung Bernina Bernette 25 (Seite 32 von 36) (Englisch, Französisch, Spanisch)

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Troubles and Corrective Measures

If sewing difculties occur, make sure the instructions are correctly followed. If a problem still exists, the reminders below

help to solve it.

Troubles Case Corrective measures Page

Stitches are

skipped.

1. The needle is bent or the needle point is

blunted.

2. The needle has not been attached to the

needle bar properly.

· Replace the needle.

· Attach the needle properly to the needle bar.

Needle thread

breaks.

1. The machine head has been threaded

incorrectly.

2. The needle thread tension is too high or low.

3. The needle is bent or the needle point is

blunted.

4. The needle is not suited to the thread used.

· Correct the threading.

· Properly adjust the thread tension.

· Replace the needle.

· Replace the needle by the one suited to the

thread used.

17-19

The bobbin thread

breaks.

1. The bobbin thread tension is too high.

2. The rubbing of the bobbin case spring has

produced a slot.

3. Scratches on the needle hole in the throat

plate.

· Decrease the tension.

· Replace the bobbin case.

· Replace the throat plate.

The needle

breaks.

1. The needle is bent or has been installed

improperly.

2. The needle hits the throat plate or the presser

foot.

· Replace or correctly attach the needle.

· Correctly position the needle, throat plate, or

presser foot.

Stitches are

puckered.

1. The presser foot applies too much pressure

to the material.

2. The tension of the needle thread is not

balanced with that of the bobbin thread.

3. When the combination of the needle and the

thread is improper.

4. The needle is too thick for the material.

· Decrease the pressure of the presser foot.

· Balance the tension.

· Properly correct the combination of needle and

the thread.

· Replace the needle by the one suited to the

material.

Stitch performance

is bad.

1. The tension of the needle thread is not

balanced with that of the bobbin thread.

· Balance the tensions. 22

The rotation noise

is too heavy or too

high.

1. Dust accumulates in the feed dog

2. The oil in the machine has run out due to a

long period of usage.

3. The oil other than the exclusive sewing

machine oil is used.

4. Thread wastes accumulate in the hook.

· Carry out maintenance of your sewing machine.

· Apply the proper sewing machine oil.

· Clean up the sewing machine.

The handwheel

does not rotate

smoothly or does

not turn.

1. The thread is entangled and caught in the

hook.

· Lubricate the hook, strongly turn the handwheel

clockwise and counterclockwise several times,

then remove the thread caught in the hook.

The material

cannot be fed.

1. The stitch length is set “0”.

2. Drop-feed knob is set to “NOT FEED”.

3. The pressure of the presser foot is too low.

· Set the stitch length to an appropriate amount.

· Set the drop-feed knob to “FEED”.

· Turn the presser foot pressure regulator to in

crease the pressure properly.

Needle threading

cannot be

performed.

1. When the needle has not been raised.

2. When the needle has not been inserted until

it can go no further at the time of attaching

the needle.

3. When the sewing machine has been turned

with the needle threader lever lowered (during

threading) by mistake.

· Turn the handwheel or press the needle

up/down switch to bring the needle to its

highest position.

· Attach the needle properly.

· Slightly turn the handwheel by hand to the

opposite side (opposite to the direction at the

time of sewing).

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