Light Bulb Replacement; Troubleshooting Guide - Bernina Bernette 55 Manual

a
C
EN Trouble shooting guide
P Cause
roblem
1.The machine is not threaded correctly
Upper thread
2.The thread tension is too tight
breaks
3.The thread is too thick for the needle
4.The needle is not inserted correctly
5.The thread is round wound the spool holder pin
6.The needle is damaged
1.The needle is not inserted correctly
Skipped stitches
2.The needle is damaged
3.The wrong size needle has been used
4.The foot is not attached correctly
1.The needle is damaged
Needle breaks
2.The needle is not correctly inserted
3.Wrong needle size for the fabric
4.The wrong foot is attached
1.The machine is not correctly threaded
Loose stitches
2.The bobbin case is not correctly threaded
3.Needle/ fabric/ thread combination is wrong
4.Thread tension wrong
1.The needle is too thick for the fabric
Seams gather or
2.The stitch length is wrongly adjusted
pucker
3.The thread tension is too tight
1.Poor quality thread
Uneven stitches,
2.The bobbin case is wrongly threaded
uneven feed
3.Fabric has been pulled
1.The machine must be lubricated
The machine is
2.Fluff or oil have collected on the hook or needle bar
noisy
3.Poor quality oil has been used
4.The needle is damaged
Thread is caught in the hook
The machine
jams
b
EN
Attention: Turn the power switch off and
wait until the lamp has cooled down
before touching it.
Loosen the screw (a) on the left side of the
sewing head and remove the face plate (b).
(1)
Pull light bulb downward to remove.
Replace the bulb with same type rated
5w/12V.
Set the face plate and tighten the screw.
(2)
Correction
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
1.Remove and reinsert needle(flat side towards the back)
2.Insert a new needle
3.Choose a needle to suit the thread and fabric
4.Check and attach foot correctly
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
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.Select a finer needle
2.Readjust the stitch length
3.Loosen the thread tension
1.Select a better quality thread
2.Remove bobbin case and rethread and insert correctly
3.Do not pull on the fabric while sewing, let it be taken up by the machine
1.Lubricate as described
2.Clean the hook and feed dog as described
3.Only use good quality sewing machine oil
4.Replace the needle
Remove the upper thread and bobbin case, turn the handwheel backwards
and forwards by hand and remove the thread remands. Lubricate as
described

Light bulb replacement