User Manual

Technical Manual for Master Terminals of the Series IF 152x
Page 31
How to Adjust the Display Contrast
The contrast of the display can be adjusted with the potentiometer R 46 (MPU board). The contrast is
correct and must not be changed if the dots of the characters can be recognized from different points
of view. Regardless of a person's size (eye level), the characters are legible. The contrast must only
be adjusted if the characters can hardly be recognized from some angles of view (eye level).
Adjustment
The master terminal must be ready for operation and the housing must be open to carry out the
adjustment.
# Turn the potentiometer R 46 (1a) by the use of a little screw driver until the display is visible from
all angles of view and only indicates digits with information.
1
1a
J 10
J 6
J 7
J 8
J 2
J 11
J 106
+
-
J 1
R46
S
BAT
ON
Br. 11-14
Br.
31
Br.5
Br.29
Br.9
Br.27
Br.
103
Br.
104
J 112 J 104
J 110
ON
ON
J 16
Br.15
R 46
Graph: MPU board index A with potentiometer R 46