Janome 134D Service Manual page 5

(3) SEWING CONDITION
CONDITION
1 Sewing results 1.
are poor.
2.
3. The check spring is not func-
4. Thread spool is not secure.
2 with heavy fabric. 1. Stitch length is too short
2. Presser foot pressure is too
3 with light fabrics, 1. Presser foot pressure is too
sewing results
are poor.
2. Stitch length is too long.
3. For other causes. See the
4 skipping 1.
stitches
2.
3.
4.
5.
6.
7.
8.
9.
10. The tip of upper looper or
CAUSE
Thread is not inserted properly
into the thread tension discs.
Position of looper thread
guide is off.
tioning properly.
(dense).
weak.
strong.
above SEWING CONDITION 1.
Needle is not inserted all up.
Too much clearance between
the needle and lower looper.
Too much clearance between
the upper looper and lower
looper.
Too much clearance between
the needle and upper looper.
Needle bar height is not
correct.
Timing of lower looper is not
correct.
Position of upper looper is not
correct.
Timing relationship of the
upper and lower loopers is not
correct.
The check spring is not
functioning properly.
lower looper is dull.
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HOW TO FIX
Re-thread properly
Adjust the looper thread guide
position.
Check the function or replace it.
Place thread spool securely.
Increase stitch length with dial.
Adjust pressure with the
presser adjusting screw
Adjust pressure with the
presser adjusting screw.
Decrease the stitch length with
the dial.
Insert the needle until it stops.
Adjust to proper clearance
Adjust to proper clearance.
Adjust to proper clearance.
Adjust the needle bar height.
Adjust lower looper timing.
Adjust upper looper position
Adjust a timing of the upper
and lower looper.
Check the function or replace it.
Replace the upper looper or
lower looper.
3
REFERECE
P 29
P 19, 20
P 25
P 26
P 13
P 22
P 23
P 24