Daktronics DF-1030 - Manual (Page 35)

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
Electrical Specification Drawings ................................... Refer to Appendix A
Mechanical Specification Drawings ................................ Refer to Appendix A
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 and the Electrical and Mechanical Specification
Drawings for the location of the modem. All displays in this series are front-accessible.
1. Open the digit panel or display face panel as described in Section 4.2.
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.
LEDs
Figure 20: Modem Board
The modem has four LEDs.
• The power LED (DS1) should remain lit while
power is applied to the modem.
• The modem RX (DS3) and TX (DS4) LEDs are
normally off, but will flash when
communicating.
• The carrier detect LED (DS5) will light when the
modem has established communication to
another modem.
Input/Output Jacks
The modem board also has several input and output jacks:
• TB2 is a phoenix connector to terminate the tip
and ring wires.
• J3 is the AC power input into the modem board
from the transformer in the driver enclosure.
• J6 is the RS232, RJ45 output jack from the modem board to the display
driver.
Maintenance and 4-7
Troubleshooting