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B.2 Contrast Adjustments for All Boards
Starting in 2005, LCD/keypad modules were factory-configured to optimize their contrast
based on the voltage of the system they would be used in. Be sure to select a KDU5V
LCD/keypad module for use with the Smart Star — these modules operate at 5 V. You may
adjust the contrast using the potentiometer at R2 as shown in Figure B-3. LCD/keypad
modules configured for 3.3 V should not be used with the 5 V Smart Star because the
higher voltage will reduce the backlight service life dramatically.
LCD/Keypad Module Jumper Configurations
Header
J5
Description
2.8 V
3.3 V
5V
Pins
Connected
1?2
3?4
n.c.
Factory
Default
×
Contrast
Adjustment
R2
D2 C1
C6
D1
U2
JP1
R3
U1
C4
U3
LCD1
C 9
C7
R4
R5
C11
C13
CR1
C12
3
4
J5
1
2
J5
Q1
R25
R26
R8
U4
J1
R11
R13
R14
R10
R9
R12
R15
J5
3
1
4
2
Q4
Q6
Q7
Q2
Q5
OTHER LP3500
3.3 V 2.8 V
n.c. = 5 V
U6
U5
J2
Q8
KP1
U7 C14
C17
RN1
DISPLAY
BOARD
J4
Figure B-3. LCD/Keypad Module Voltage Settings and Contrast Adjustment
You can set the contrast on the LCD display of pre-2005 LCD/keypad modules by adjust-
ing the potentiometer at R2 or by setting the voltage for 5 V by removing the jumper that
was installed at the factory across pins 1–2 on header J5 as shown in Figure B-3. Only one
of these two options is available on these older LCD/keypad modules.
NOTE: Older LCD/keypad modules that do not have a header at J5 or a contrast adjust-
ment potentiometer at R2 are limited to operate only at 5 V, and will work with the
Smart Star. The older LCD/keypad modules are no longer being sold.
User ’s Manual
133
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