ELNA 6001 Service Manual page 7

PDFMAILER.DE
CONDITION
4. Breaking bobbin
thread.
5. Needle breaks.
6. Noisy operation.
7. Deformation
pattern.
CAUSE
1. Incorrectly threaded
bobbin.
2. Too much thread is
around on the bobbin.
3. Lint is stuck inside the
bobbin holder.
4. Thread quality is too low.
5. Thread is jamming
around the bobbin.
1. Needle is hitting the
needle plate.
2. Needle is bent or worn.
3. Needle is hitting the
shuttle.
4. The fabric moves while
the needle is piercing it,
or the needle zigzags
while in fabric.
5. Fabric is being pulled too
strongly while sewing.
1. Backlash between shuttle
hook gear and lower
shaft gear is too great.
2. Lower shaft gear is
loose.
3. Inappropriate belt
tension.
4. Not enough oil
1. Inappropriate feed
balance.
2. Inappropriate zigzag
synchronization.
3. Upper thread tension is
too strong.
HOW IS FIX
Thread bobbin correctly.
Adjust the bobbin winding stopper.
Clean the shuttle.
Change to a high quality sewing
thread.
Clear out the jamming thread.
See mechanical adjustment
"NEEDLE POSITION".
Change the needle.
See mechanical adjustment
"CLEARANCE BETWEEN NEEDLE
AND HOOK".
See mechanical adjustment "
ZIGZAG SYNCHRONIZATION".
Guide the fabric gently while
sewing.
See mechanical adjustment
"BACKLASH (LOWER SHAFT
GEAR)".
Eliminate the looseness.
See part removal and replacement
"DRIVING MOTOR (DC MOTOR)".
Oil all moving parts.
See mechanical adjustment
"STRETCH STITCH FEED
BALANCE".
See mechanical adjustment
"ZIGZAG SYNCHRONIZATION"
See mechanical adjustment
"NEEDLE THREAD TENSION".
4
REFERENCE
Page 13
Page 16
Page 19
Page 17
Page 29
Page 20
Page 19
Page 21