Trouble Shooting; Trouble Shooting Guide - Bernina Bernette 20 Instruction Manual

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Trouble Shooting

Trouble shooting guide

Before calling for service, check the following items. If the problem still persists, contact the
place of purchase or your nearest authorized dealer.
Problem
1. The machine is not threaded correctly.
2. The thread tension is too tight.
3. The thread is too thick for the needle.
Upper thread
4. The needle is not inserted correctly.
breaks
5. The thread is wound around the spool
pin.
6. The needle is damaged.
1. The bobbin case is not inserted correctly.
Lower thread
breaks
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.
Skipped
stitches
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.
Needle
breaks
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.
Loose
stitches
3. Needle/fabric/thread combination is
wrong.
4. Thread tension is wrong.
1. The needle is too thick for the fabric.
Seam
gather or 2. The stitch length is adjusted wrong.
pucker
3. The thread tension is too tight.
Cause
1. Rethread the machine.
2. Reduce the thread tension.
3. Select a larger needle.
4. Remove and reinsert the needle (flat
5. Remove the reel and wind thread onto
6. Replace the needle.
1. Remove and reinsert the bobbin case
2. Check both bobbin and bobbin case.
3. Adjusting thread tension as described.
1. Remove and reinsert needle (flat side
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. Insert a new needle.
2. Insert the needle correctly (flat side
3. Choose a needle to suit the thread
4. Select the correct foot.
5. Use the screwdriver to firmly tighten
6. Attach the presser foot that is appro-
7. Loosen the upper thread tension.
1. Check the threading.
2. Thread the bobbin case as illustrated.
3. The needle size must suit the fabric
4. Correct the thread tension.
1. Select a finer needle.
2. Readjust the stitch length.
3. Loosen the thread tension.
Correction
(Lower number).
side towards the back).
reel.
and pull on the thread. The thread
should pull easily.
towards the back).
towards the back).
and fabric.
the screw.
priate for the type of stitch that you
wish to sew.
and thread.
Reference
14
18
21
17
14
17
13
13
18
17
17
21
32-33
14
18
17
17
21
32-33
17
32-33
18
14
11
21
18
21
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