Brother International RH-9820 Instruction Manual - English - Page 117
Adjusting the position of the lower thread presser <-02 specifications only>
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9. STANDARD ADJUSTMENTS 9-28. Adjusting the position of the lower thread presser Adjust the lower thread presser (1) so that it securely holds the lower thread. 0549B 0550B 0551B (Seen from the front) (Seen from directly above) (Seen from directly to the right) 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). RH-9820 108