Daktronics AF-3180-64-R,A - Manual (Page 46)

The controller contains two jumpers (X1 and X2). You must close X1 for use with a
modem system. The jumper (X1) must jump both pins for a modem system.
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
1. Open the display as described in Section
4.5.
2. To replace a modem, first disconnect the
power and signal connections (refer to
Figure 37 on the right for the location of
the power jack).
3. The modem is held in place with four
screws. Remove the screws and lift the
modem out of the display the display.
4. Attach the new modem using the same four
screws removed in step 2, above.
The modem module has 5 LEDs. The power LED
should remain lit while power is applied to the
modem. The Carrier Detect LED will light when the
modem is in the process of communicating.
A modem system requires the X1 jumper to be set on
the controller board. Refer to Figure 38 on the following page for jumper location.
Figure 40: Modem Board
Figure 41: Modem/Signal