NLI HR-2A, Instruction Manual, Page: 13 / 32

5. TROUBLE SHOOTING
Trouble Cause Cure
Needle thread breaks 1. Damaged looper Replace looper.
2. Needle thread too tight Reduce tension.
3. Worn out feed dog causing fine Relace feed dog.
stitches
4. Thread twisting or entangling Secure correct threading.
between thread stand and needle
5. Improper needle setting; Set needle properly;
Bent or damaged needle
Replace needle.
6. Needle thread too loose Increase tension.
Looper thread breaks 1. Looper thread too tight or too Adjust tension.
loose
2. Damaged looper Replace looper.
3. Thread twisting or entangling Check for correct threading.
between thread stand and
looper
No chaining on work edges 1. Incorrect threading Thread machine correctly.
2. Looper thread too tight Reduce tension.
3. Improper timing of needle and Adjust timing of needle and
looper looper.
4. Presser foot screw loosened Tighten the screw.
Thread skips 1. Needle setting not correct;
Set needle correctly.
Bent or damaged needle
2. Needle thread regulator set too
Replace needle.
low. Raise regulator.
3. Needle thread sticking on
Use lubricant on thread.
needle due to heat
4. Needle bar set too high Lower needle bar.
5. Needle thread pinched by Lower needle guard slightly.
needle guard, collapsing loop
6. Looper thread too ｌｏｏｓｅ, not Increase looper thread tension.
making a good triangle
Needle or looper breaks 1. Improper timing of needle and Adjust timing of needle and
looper looper.
2. Bent needle Replace needle.
Nonuniform stitch length; 1. Weak pressure of presser foot Increase pressure.
seam not straight 2. Bent needle Replace needle.
3. Worn out feed dog Replace feed dog.
When trouble occurs while operating the machine, refer to the following table for selecting suitable measures:
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