Bedienungsanleitung Bernina Bernette London-7 (Seite 81 von 85) (Englisch)

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Before calling for service, check the following items. If the problem still persists, contact the

place of purchase or your nearest authorized dealer.

Upper thread

breaks

Lower thread

breaks

Skipped

stitches

Needle

breaks

Loose

stitches

Seam

gather or

pucker

1. The machine is not threaded correctly.

2. The thread tension is too tight.

3. The thread is too thick for the needle.

4. The needle is not inserted correctly.

5. The thread is wound around the spool

pin.

6. The needle is damaged.

1. The bobbin case is not inserted correctly.

2. The bobbin case is threaded wrong.

3. The lower thread tension is too tight.

1. The needle is not inserted correctly.

2. The needle is damaged.

3. The wrong size needle has been used.

4. The foot is not attached correctly.

5. The machine is not threaded correctly.

6. The presser foot pressure is not strong

enough.

1. The needle is damaged.

2. The needle is not correctly inserted.

3. Wrong needle size for the fabric.

4. The wrong foot is attached.

5. The needle clamp screw is loose.

6. The presser foot that is used is not

appropriate for the type of stitch

pattern that you wish to sew.

7. The upper thread tension is too tight.

1. The machine is not correctly threaded.

2. The bobbin case is not correctly

threaded.

3. Needle/fabric/thread combination is

wrong.

4. Thread tension is wrong.

1. The needle is too thick for the fabric.

2. The stitch length is adjusted wrong.

3. The thread tension is too tight.

1. Select a finer needle.

2. Readjust the stitch length.

3. Loosen the thread tension.

1. Check the threading.

2. Thread the bobbin case as illustrated.

3. The needle size must suit the fabric

and thread.

4. Correct the thread tension.

1. Insert a new needle.

2. Insert the needle correctly (flat side

towards the back).

3. Choose a needle to suit the thread

and fabric.

4. Select the correct foot.

5. Use the screwdriver to firmly tighten

the screw.

6. Attach the presser foot that is appro-

priate for the type of stitch that you

wish to sew.

7. Loosen the upper thread tension.

1. Remove and reinsert needle (flat side

towards the back).

2. Insert a new needle.

3. Choose a needle to suit the thread.

4. Check and attach correctly.

5. Rethread the machine.

6. Adjusting the presser foot pressure.

1. Remove and reinsert the bobbin case

and pull on the thread. The thread

should pull easily.

2. Check both bobbin and bobbin case.

3. Adjusting thread tension as described.

1. Rethread the machine.

2. Reduce the thread tension.

(Lower number).

3. Select a larger needle.

4. Remove and reinsert the needle (flat

side towards the back).

5. Remove the reel and wind thread onto

reel.

6. Replace the needle.

Trouble shooting guide

Problem

Cause

Correction Reference

Trouble Shooting

32-33

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Bernina Bernette London-7 Seite 81

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