Trouble Shooting Guide - JUKI HZL-355ZW-A Instruction Manual

Trouble shooting guide

Problem Cause
Upper thread 1. The machine is not threaded
breaks correctly
2. The thread tension is too tight
3. The thread is too thick for the
needle
4. The needle is not inserted correctly
5. The thread is round wound the
spool pin
6. The needle is damaged
Skipped stitches 1. The needle is not inserted correctly
2. The needle is damaged
3. The wrong size needle has been
used
4. The foot is not attached correctly
Needle breaks 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
Loose stitches 1. The machine is not correctly
threaded
2. The bobbin case is not correctly
threaded
3. Needle/ fabric/ thread combination
is wrong
4. Thread tension wrong
Seams gather or 1. The needle is too thick for the fabric
pucker 2. The stitch length is wrongly
adjusted
3. The thread tension is too tight
4. Fabric puckers.
Uneven stitches,
1. Poor quality thread
uneven feed
2. The bobbin case is wrongly
threaded
3. Fabric has been pulled
The machine is
1. Fluff or oil have collected on the
noisy
hook or needle bar
2. The needle is damaged
The machine
Thread is caught in the hook
jams
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 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
4. Use a backing for fine or stretchy fabrics.
1. Select a better quality thread
2. Remove bobbin case and retread and
insert correctly
3. Do not pull on the fabric while sewing,
let it be taken up by the machine
1. Clean the hook and feed dog as
described
2. Replace the needle
Remove the upper thread and bobbin
case, turn the handwheel backwards and
forwards by hand and remove the thread
remands.
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