Bernette Chicago 5 - Page 93

89
Problem
Cause Correction
Reference
Upper thread breaks
• The machine is not threaded correctly. – Rethread the machine.
12
• The thread tension is too tight. – Reduce the thread tension. (Lower
number).
16
• The thread is too thick for the needle. – Select a larger needle.
19
• The needle is not inserted correctly. – Remove and reinsert the needle (flat
side towards the back).
15
• The thread is wound around the spool
pin.
– Remove the spool and wind thread
onto spool.
12
• The needle is damaged. – Replace the needle.
15
Lower thread
breaks
• The bobbin case is not inserted cor-
rectly.
– Remove and reinsert the bobbin case
and pull on the thread. The thread
should run easily.
11
• The bobbin case is threaded incor-
rectly.
– Check both bobbin and bobbin case.
11
Skipped stitches
• The needle is not inserted correctly. – Remove and reinsert needle (flat side
towards the back).
15
• The needle is damaged. – Insert a new needle.
15
• The wrong size needle has been used. – Choose a needle to suit the thread.
19/20
• The foot is not attached correctly. – Check and attach correctly.
92-97
• The machine is not threaded correctly. – Rethread the machine.
12
• The presser foot pressure is not strong
enough.
– Adjust the presser foot pressure.
17
Trouble Shooting
Problem
Cause Correction
Reference
Needle breaks
• The needle is damaged. – Insert a new needle.
15
• The needle is not correctly inserted. – Insert the needle correctly (flat side
towards the back).
15
• Wrong needle size for the fabric. – Choose a needle to suit the thread
and fabric.
19/20
• The wrong foot is attached. – Select the correct foot.
21
• The needle clamp screw is loose. – Use the screwdriver to tighten the
screw firmly.
15
• The presser foot which is attached is
not appropriate for the selected type of
stitch pattern.
– Attach the presser foot that is appro-
priate for the selected type of stitch.
21
• The upper thread tension is too tight. – Loosen the upper thread tension.
16
Loose stitches
• The machine is not correctly threaded. – Check the threading.
12
• The bobbin case is not correctly
threaded.
– Thread the bobbin case as illustrated.
11
• Needle/fabric/thread combination is
wrong.
– The needle size must suit the fabric
and thread.
19/20
• Thread tension is wrong. – Correct the thread tension.
16
Seam gathers or
puckers
• The needle is too thick for the fabric. – Select a finer needle.
19/20
• The stitch length is adjusted incor-
rectly.
– Readjust the stitch length.
29
• The thread tension is too tight. – Loosen the thread tension.
16