Daktronics DF-12xx - Manual (Page 40)

4-8 Maintenance and
Troubleshooting
1. The power LED (DS1) should remain lit while power is applied to the
modem.
2. The modem RX (DS3) and TX (DS4) LEDs are normally off, but will flash
when communicating.
3. The carrier detect LED (DS5) will light when the modem has established
communication to another modem.
The modem board also has several input and output jacks:
1. TB2 is a phoenix connector to terminate the Tip and Ring wires.
2. J3 is the AC power input into the modem board from the transformer in the
driver enclosure.
3. J6 is the RS232, RJ45 output jack from the modem board to the display
driver.
4. J5 is an RJ11 jack for termination of a pre-terminated phone line (if
needed).
5. J2, TB1, and TB3 are not used in this application.
4.4 Light Sensor Location
Reference Drawing:
Light Sensor Installation, G3 ....................................... Drawing A-183775
Mechanical Specification Drawings..........................Refer to Appendix A
Displays in the DataMaster series use a light sensor to regulate sign dimming
functions. Use Drawing A-183775 and the following instructions to replace the light
sensor in your DataMaster Gasoline Price display. If the sign or sign system has
more than one display, the light sensor is found in the host/primary display only.
1. Open the digit panel or display face panel as
described in Section 4.2.
2. Locate the 5 /
8
" sensor plughole on the front panel
of the display. The location of the plug varies by
model. Refer to the Mechanical Specifications
Drawings for model-specific information.
3. There are two 6-32 studs above and below the
plughole. The internal light sensor assembly
(Daktronics part #0A-1279-0203) is positioned on
the studs, with the clear lens toward the front of
the cabinet and the cable at the bottom. Secure the
sensor with the provided plastic wing nuts.
4. Route the signal cable to the driver and insert the
6-postion plug into the mating jack on the
driver, TB1.
5. Close the hinged access doors and replace the
screws.
Figure 22: Internal Light Sensor