Daktronics AB-1600-1.5,2.5 - Manual (Page 61)

Maintenance & Troubleshooting
4-17
DS1 - Line Fault: This indicates if the controller and data cable are connected correctly. With the
controller turned on, and a good fiber optic connection, it should be OFF (it may flash ON
occasionally). If DS1 stays ON there is probably a break in the fiber optic cable, a bad termination or
something wrong with the controller computer.
DS2 - Test Mode : This indicates when the line receiver is in test mode. If it is ON, a test pattern will
appear on the display.
DS3 - Data: This indicates when line receiver is receiving data from the controller. It will flash ON
when data is being received.
DS4 - Bright: This indicator will be ON when the photocell is detecting a full bright light level and
OFF for other light levels. If no photocell is connected to line receiver, it will flash.
DS5 - Power: This indicates when the power on the line receiver is working. It should ALWAYS be
ON.
DS6 - DS13 - Thermostat Inputs: These indicate proper cooling of the display. These should ALL
be ON. An OFF LED indicates a failed fan. When this occurs, the line receiver will automatically
blank the display to prevent heat damage to the electrical components.
DS14 - Program: This indicates the line receiver powered-up OK. It should be ON.
DS15 and/or DS16 -Transmit: Indicate(s) signal transmission out of the fiber optic transmitter(s)
(possibly to another display).
Line Receiver Connections
J1: In from the fan controller enclosure
J2: Power in
J3: Echo display dimming.
J4: Display 2 out
J5: Display 1 out
J6: Fiber optic cable out
J7: Fiber optic cable out
J8: Fiber optic cable in
Switch settings (S1-S12) are configured at the factory. If the need arises to verify switch settings, use
the label on the cover of the line receiver as a guide or refer to Drawings A-109450, A-109648 and
A-110166 in Appendix B.
Complete the following steps to remove a line receiver board from its enclosure.
1. To access the enclosure housing the serial line interface, remove the necessary lens/reflector
assemblies as explained in Section 4.3.
2. Remove the cover form the enclosure.
3. Disconnect all signal cables from the circuit board. It may be helpful to label the cables to ensure
correct placement when installing another serial line interface board.
4. Remove the nuts holding the board in place and remove the board from the enclosure.