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Trouble Shooting
Problem Cause Correction Reference
Seam puckering
The upper thread tension is too tight. Loosen the thread tension.
16
The upper thread is not threaded cor-
rectly.
Rethread the machine.
12
The needle is too heavy for the fabric
being sewn.
Choose a needle to suit the thread
and fabric.
19/20
The stitch length is too long for the
fabric.
Adust the stitch length.
30
The presser foot pressure is not cor-
rectly adjusted.
Adjust the presser foot pressure.
17
Patterns/
Designs
are
distorted
The correct presser foot is not used. Select the correct foot.
127-132
The upper thread tension is too tight. Loosen the thread tension.
16
The machine
jams
Thread is caught in the hook. Remove the upper thread and the
bobbin case, turn the handwheel
backwards and forwards by hand
and remove the thread remnants.
120/121
The feed dog is packed with lint.
The machine is noisy
Lint has collected on the hook or nee-
dle bar.
Clean the hook and feed dog as
described.
120/121
The needle is damaged. Replace the needle.
15
Slight humming sound coming from
internal motor.
Remove the upper thread and the
bobbin case, turn the handwheel
backwards and forwards by hand
and remove the thread remnants.
120/121
Thread is caught in the hook.
The feed dog is packed with lint.
Uneven stitches,
uneven feed
Poor quality thread. Select a better quality thread.
19/20
The bobbin case is threaded incor-
rectly.
Remove the bobbin case, thread and
reinsert correctly.
11
Fabric has been pulled. Do not pull the fabric while sewing, let
it be fed by the machine.
502020.83.11_2013_06_bernette chicago 7_EN
126


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