E
QUIPMENT
I
NSIDE
VIEW
AlphaXpress 8731 Sign Installation and Maintenance Manual (pn 1508610601 rev. A)
31
LED driver board
The size of the sign determines the number of driver boards in the sign (for example, a 27 x 54 sign would
have 27 driver boards; a 27 x 72 sign would have 36). Each board is 6 x 9 pixels, and each pixel is composed
of 8 LED lamps.
Figure 26.
LED driver board, front and back views.
Item
PCB label
Name
Description
A
LD1
POWER
On = 12V supplied to LED driver board.
LD2
FAULT
On = one or more bad LED lamps on the LED driver board (if in normal operating mode).
LD3
COMM
On = There is NO communication from sign controller.
Off = There is communication from the sign controller.
LD4
RUN
Flashing = LED driver board processor operating.
B
BIN LABEL
Information on the intensity and wavelength of the LED lamps.
C
P3
DATA
Connects to Controller #1 via a ribbon cable.
D
P5
Programming port for the LED driver board processor.
E
P2
LED DRIVER BOARD
ADDRESS
This address is set using an address plug (pn 1509100701).
F
P1
+V1
Supplies power to the LED driver board.
Front view
6 pixels
A
Back view
B
C
9 pixels
D
E
F
Jumper wires
Refer to the appropriate wiring
diagram for your sign model. These
are preset from the factory with the
correct settings.
Plugs into P2