Dürkopp Adler 755 B, Operating Instructions Manual

Page: 209 / 374

Programming
Operating Instructions 755 B, 756 B/F - 00.0 - 02/2021 207
Adjusting and testing hook thread monitor
 The display switches to
Test bobbin thread monitor
.
Information
When the light barriers are correctly aligned, a reflection occurs when an
empty bobbin is turned.
The intensity of the reflection is illustrated by a black bar and a number
between
1 and 15 .
If the value is above the minimum value of 8 , the display shows an arrow
between reflecting head and hook thread bobbin. A signal tone will sound
at the same time.
Important
If the light barrier setting is correct, the maximum value of 15 must be
reached when the infrared beam hits the area of the reflecting surface of
the bobbin.
 The black bar is within the green range.
Fig. 165: Adjusting and testing hook thread monitor
To adjust the hook thread monitor:
1. Press the desired button.
Symbols Meaning
Adjust sensitivity left
• 0 - 15
Adjust sensitivity right
• 0 - 15