Janome 1200D Manual page 7

3. Thread breakage
Before checking the adjustment, make sure of the good quality of the thread and the
needle, the correctness of threading and the smoothness of all the thread passages.
Quite often, a damage to thread passage is the cause of thread breakage. If all these
points are in order, check the following:
- Dull point of needle or bent needle - replace.
- Dull or burred point of looper - replace.
- Scratch or injury on chaining finger of needle plate - replace.
- Too strong thread tension.
- Unsmooth or injured edge of needle hole on needle plate (thread breakage of chain
stitches) - replace.
4. Irregular stitches
- Inadequate setting of thread tensions - re-adjust.
- Unsmooth thread passage - polish.
- Height of feed dog.
- Position of looper thread take up levers and thread guides.
- Upper knife is dull - replace.
- Damage on needle plate face or presser foot sole - replace.
- Incorrect alignment of thread guide bar with spool pins - reset it at correct
position to align to spool pins.
5. Breakage of needle
Check and adjust if necessary
- Dull point of needle or bent needle - replace.
- Incorrect placement of needle - refer to "changing the needle" in the instruction manual.
- Clearance of needle guard and (chain needle).
- Incorrect alignment of needle holes of presser foot and needle plate.
- Clearance from needle to lower looper.
- Clearance between the upper and lower loopers.
- Feed timing.
- Horizontal feed timing against chain-stitch needle.
MECHANICAL SEWING DISORDERS
5
C2
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