Setting the remaining thread monitor
Service Instructions 755 A/756 A - 00.0 - 02/2019 77
9 Setting the remaining thread monitor
Fig. 78: Setting the remaining thread monitor (1)
The remaining thread monitor together with the infrared reflected light
barriers (1) and (2) monitors the left and the right bobbin.
Fig. 79: Setting the remaining thread monitor (2)
To set the remaining thread monitor:
1. To switch on the remaining thread monitor, open the menu Service >
Machine config. and press the
button ( p. 348).
2. Insert an empty bobbin.
3. Turn the screw (4) to align the light barrier (1).
 The light barrier must be aligned such that it hits the reflecting
surface (3) through the slot (5) in the hook cover.
4. Open the menu Service > Machine test > Hook thread
monitor to fine-tune the settings ( p. 366).
5. Adjust the setting for the 2
nd
remaining thread monitor in the same way.
(1) - Light barrier 1
(2) - Light barrier 2
(3) - Reflecting surface
(1) - Light barrier 1
(2) - Light barrier 2
(4) - Screw
(5) - Slot
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