Daktronics AF-3150-20-R,A - Manual (Page 46)

Power Supplies
The LED power supplies are identified as assemblies. Each power supply unit
controls four modules; a power supply assembly (two power supply units) controls
eight. The LED power supplies are identified as assemblies 0A-1289-4011 and 0A-
1289-4012 in the Component Layout Diagram.
Complete the following steps to remove a power supply from the display:
Tools required: 1/8" hex wrench and #2 Phillips screwdriver
1. Remove the module directly in front of the failed power supply.
2. Disconnect and label all the wires connected to the power supply.
3. Remove the hardware holding the power supply in place to free the unit.
4. Follow these steps in reverse order to install a new power supply. Refer to
the display’s Schematic when reconnecting the wires.
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 J9 on the controller (refer to your display’s
Schematic). When the displays are mounted back-to-back, only the primary side has
a light sensor.
Modem
If a modem was included with the display, it is located
inside the display next to the controller board.
Maintenance and Troubleshooting 4-8
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. First disconnect and label all the wires
connected to the modem (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 Carrier Detect LED will light when the modem is in the process of
communicating.
Figure 39: Modem
3. The modem RX and TX will flash when communicating with another
modem.
4. The PC Connect LED is not used when this modem is mounted in a display.