18
Troubleshooting
6.Disrupted pattern
[Example of phenomenon] [Check item before adjustment]
Is the stitch length dial adjusted the properly?
Is the presser foot pressure appropriate?
Is the feed dog lifted?
Is the stitch width lever positioned correctly?
Step Item Diagnosing Method Standard
Reference
Page
1. Needle and
needle plate
Needle
dropping
points
(At
straight
stitching)
<Condition>
<SD>
Pattern selection dial: "6"
<2D>
Pattern selection dial: "4"
<3D>
Pattern selection dial: "3"
Stitch width lever: "0"
<Diagnosis>
Rotate the handweel, bring down the nee-
dle lower than the surface of needle plate.
Measure the relative position (A, B) be-
tween the needle and the slot.
A = B
[Adjustment]
page.30
Needle
dropping
points
(At
maximum
zigzag
stitching)
<Condition>
<SD>
Pattern selection dial: "11"
<2D>
Pattern selection dial: "7"
<3D>
Pattern selection dial: "3"
Stitch width lever: "5"
<Diagnosis>
Rotate the handweel, bring down the nee-
dle lower than the surface of needle plate.
Measure the relative position (C) between
the needle and the slot.
C = 0.7 ± 0.3
mm
[Adjustment]
page.30