HappyJapan HCR3-1502, Maintenance Manual

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9. Check an angel on a disk visually, and then loosen
a screw of a needle which requires adjustment.
If an angel on the disk deviates from a required
angle, try to adjust an angle on the disk and tighten
the screw when an required angle is secured.
10. After completion of the above step No. 9, deactivate
thread detection, and then check if a needle bar works
correctly with a machine activated.
Note: If a needle bar does not work correctly, go back to the
above step No. 8 and lower an angle by every two(2)
degrees as appeared at Example below.
Tighten a screw of a needle which requires adjustment
when an appropriate angle is secured.
Then, go back to the above step No. 10.
Example: 180
⇒
178
⇒
176
・・・・・・
11. Put thread adjusting unit assembly back on.
Steps complete.