Toyota SD Service Manual page 11

Step Item
Clearance
2. Needle and
between
upper
needle and
plate
upper plate
spring
spring
Motor belt
3. Motor belt
tension
Diagnosing Method
<Condition>
<SD>
Pattern selection dial: "11"
<2D>
Pattern selection dial: "7"
<3D>
Pattern selection dial: "3"
Stitch width lever: "5"
<Diagnosis>
When the needle bar is brought to the low-
er dead point at the right side by rotating
the handweel, measure the clearance
(A, B) between the needle and the upper
plate spring.
<Diagnosis>
Remove external panels and others.
When pressing the center of motor belt
with a force of 3N, measure the depth of
flexure (A) on the belt.
9
Troubleshooting
Reference
Standard
Page
A = 0.5 to 1.2
mm [Adjustment]
B = 0.5 to 1.0 page.28
mm
[Remove]
A = 7.0 to 9.0 page.45
mm [Adjustment]
page.43