Brother RH-9820 Service Manual page 189

7-28. Adjusting the position of the lower thread presser <-02 specifications only>
Adjust the lower thread presser (1) so that it securely holds the lower thread.
(Viewed from directly above)
1. Loosen the screw (4) and move the lower thread presser (1) up or down to adjust so that its top projects approximately 0.5
mm from the top of the thread groove (3) in the throat plate (2).
2. Check that the lower thread presser (1) does not cover the groove at the front of the throat plate (2).
* If the groove is covered, loosen the nut (5) and then turn the screw (6) to adjust.
3. Check that the front of the throat plate (2) and the lower thread presser (1) are overlapping by 0.5 - 1.0 mm after thread
trimmer lever bracket B (7) has operated.
* If adjustment is required, remove the lower thread presser base (8), loosen the nut (9), and then turn the screw (10) to
adjust.
4. Once adjustment is complete, tighten the nuts (5) and (9) that were loosened, and install the lower thread presser base (8).
(Viewed from the front)
(Viewed from directly to the right)
RH-9820
7. ADJUSTMENTS
0549B
0550B
0551B
180