ELNA 3230 - Page 5

Elna International Corps. SA 3210 / 3230 Service manual
CONDITION CAUSE HOW TO FIX REFERENCE
6. Noisy
operation
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.
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.
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7. Deformed
pattern.
1. Inappropriate feed
balance.
2. Inappropriate zigzag
synchronization.
3. Upper thread tension is
too strong.
See mechanical adjustment
”Stretch Stitch Balance”
See mechanical adjustment
“Needle Swing”.
Adjust the needle thread
tension correctly.
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8. Improper
buttonhole
results.
1. Buttonhole stitch balance
is not correct.
2. Changing to bar tack is
too early or will not work.
See mechanical adjustment
“Buttonhole Feed Balance”.
See mechanical adjustment
“Buttonhole Length”.
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