Daktronics Galaxy AF-3150 Series, Manual

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Light Detector
The light detector is internally mounted and wired at Daktronics. It is located in the
bottom left corner on the front of the primary display (identified as assembly 0A-
1241-4013 (LT) in the
Component Layout Diagram ). A 4-conductor cable
connects the light detector to the controller. The cable is terminated at the terminal
block on the light sensor and at the J9 jack on the controller board. When the
displays are mounted back-to-back, only the primary display has a light sensor.
Modem
Figure 39: Modem
If a modem was included with the display, it is
located inside the display next to the controller
board.
Complete the following steps to replace a modem
in the display
: Tools required: 1/8" hex wrench
and 3/16" nut driver
1. Remove the module directly in front of
the modem.
2. To replace the modem, first disconnect
the power and signal connections (refer
to
Figure 39
on the right for the cable
locations).
3. The modem is held in place with four
screws. Remove the screws using a
3/16" nut driver and lift the modem out
of the display.
4. Follow these steps in reverse order to
install a new modem.
The modem module has five LEDs.
1. The Power LED should remain lit while power is applied to the modem.
2. The modem RX and TX will flash when communicating.
3. The Carrier Detect LED will light when the modem has established
communication to another modem.
4. The PC Connect LED is not used when this modem is mounted in a display.
The modem board also has several input and output jacks.
1. J3 is the power input for 12 VAC
2. TB2 is a phoenix connector to terminate the Tip and Ring wires
3. J5 is an RJ11 jack for termination of a pre-terminated phone line
4. J6 is the RS/232 RJ11 output to the controller
5. J2, TB1, and TB3 are not used in this display application
A modem system requires a jumper (X1) to be set on the controller board. For a
modem system the jumper must jump both pins. Refer to
Figure 40
below for the
location of the jumper to be set.
Maintenance and Troubleshooting
4-9