ELNA 3210 Service Manual page 5

Elna International Corps. SA
CONDITION
6. Noisy
operation
7. Deformed
pattern.
8. Improper
buttonhole
results.
CAUSE
1. Backlash between
shuttle hook gear is too
great.
2. Lower shaft gear is
loose.
3. Inappropriate belt
tension.
4. Not enough oil.
5. Upper shaft is loose.
1. Inappropriate feed
balance.
2. Inappropriate zigzag
synchronization.
3. Upper thread tension is
too strong.
1. Buttonhole stitch balance
is not correct.
2. Changing to bar tack is
too early or will not work.
3210 / 3230
HOW TO FIX
See mechanical adjustment
"Backlash between Hook
Gear and Lower Shaft
Gear".
Eliminate the looseness.
See mechanical adjustment
"Motor Belt Tension".
Oil all moving parts.
Eliminate the looseness.
See mechanical adjustment
"Stretch Stitch Balance"
See mechanical adjustment
"Needle Swing".
Adjust the needle thread
tension correctly.
See mechanical adjustment
"Buttonhole Feed Balance".
See mechanical adjustment
"Buttonhole Length".
Page 03
Service manual
REFERENCE
Page 19
Page 26
Page 14
Page 11
Page 22
Page 23