Bernina Bernette 12 Instruction Manual download pdf (Page 79)

Seam

puckering

Patterns are

distorted

1. The needle thread tension is too tight.

2. The needle thread is not threaded

correctly.

3. The needle is too heavy for the fabric

being sewn.

4. The stitch length is too long for the

fabric.

5. The presser foot pressure is not

correctly adjusted.

1. The correct presser foot is not used.

2. The needle thread tension is too tight.

1. Select the correct foot.

2. Loosen the thread tension .

1. Lossen the thread tension.

2. Rethread the machine.

3. Choose a needle to suit the thread and

fabric.

4. Make stitch dense.

5. Adjusting the presser foot pressure.

The sewing

machine

doesn't

operate

1. The machine is not turned on. 1. Turn on the machine.

The

machine

jams

Remove the upper thread and bobbin

case, turn the handwheel backwards

and forwards by hand and remove the

thread remnants.

The

machine is

noisy

1. Fluff have collected on the hook or

needle bar.

2. The needle is damaged.

1. Clean the hook and feed dog as

described.

2. Replace the needle.

Uneven

stitches,

uneven feed

1. Poor quality thread.

2. The bobbin case is threaded wrong.

3. Fabric has been pulled.

1. Select a better quality thread.

2. Remove the bobbin case, the thread

and reinsert correctly.

3. Do not pull on the fabric while sewing,

let it be taken up by the machine.

Problem

Cause

Correction Reference

4. Thread is caught in the hook.

3. Slight humming sound coming from

internal motor.

3. Normal.

5. The feed dogs are packed with lint.

Remove the upper thread and bobbin

case, turn the handwheel backwards

and forwards by hand and remove the

thread remnants.

1. Thread is caught in the hook.

2. The feed dogs are packed with lint.

2. Connect the power line plug to the

electric outlet.

2. The machine is not plugged in.

Trouble Shooting

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