Daktronics DF-12xx - Manual (Page 27)

Maintenance and 3-5
Troubleshooting
In the display, the signal surge
suppression board is an inline device
used to filter the current loop data line.
It suppresses surges down to a low
voltage to protect the display’s
controller. Refer to Drawing A-
184918 for the location of the surge
board inside the driver enclosure.
The surge board is pre-wired before the
display is shipped.
Note: The surge suppressor must be
firmly connected to the driver
enclosure, and the display must be
properly grounded in order to be
effective.
Replacing a Modem
Reference Drawings:
Modem Installation; 4 col MASC Driver Enc............................... A-177039
If a modem is included with the display, it is mounted inside the display enclosure,
behind a digit, and near the driver but the location and mounting varies by model.
Refer to Drawing A-177039 for the location of the modem. This display is front
accessible.
1. Open the digit panel or display face panel.
2. Remove the cover from the driver
enclosure.
3. Disconnect all connectors from the
modem. Release each connector by
squeezing together the locking tabs as you
pull the connector free. Note: When
reconnecting, remember that these are
keyed connectors and will attach in one
way only. Do not attempt to force the
connections.
4. Remove the nuts securing the modem to
the inside of the enclosure.
5. Carefully lift the modem from the display
and place it on a clean, flat surface.
6. Follow the steps in reverse order to attach
a new modem.
The modem has four LEDs.
Figure 13: Signal Surge Suppression Board
Figure 14: Modem Board