Thread Scratch Link Adjustment - Brother NV4000D Service Manual

Adjustment
1. Select test mode "28".
2. Loosen the screw of thread scratch link and lower the thread scratch link to the limit. And then tighten the screw.
(Reference 1)
↓
3. Select THPM " " and then lower the shuttle to the limit.
4. Loosen the screw of thread scratch link again.
5. Adjust the height of the thread scratch linkso that the clearance between the rack and the thread scratch link is 0.2
- 0.3 mm. (Reference 2)
6. Tighten the screw of thread scratch link.

Thread scratch link adjustment

1 Before adjustment
2 After adjustment
Screw
Thread
scratch link
4 - 19