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28 Maintenance and Troubleshooting
5.4 Segmentation and Digit Designation
Reference Drawing:
Digit Service, Stackable Scoreboards ......................... Drawing A-156994
In each digit, certain LEDs always go on and off together. These groupings of LEDs
are referred to as
segments . The Digit Segments A-G detail on Drawing A-156994
shows which connector pin number is wired to each digit segment, as well as the
wiring color code used throughout the display (illustrated at lower left on drawing).
The component locations
drawings in
Section 5.2 specify the driver connectors
controlling the digits. Numbers
displayed in hexagons in the upper half
of each digit, as shown in
Figure 6 ,
indicate which connector is wired to that
digit. (The lower number in the square
indicates nominal digit size.) The
drawings listed at the beginning of this
section also indicate digit designation
and specify the harnesses used for each
of the digit/driver connections.
5.5 Lightening Protection
The use of a disconnect near the scoreboard to completely cut all current-carrying
lines significantly protects the circuits against lightning damage. The National
Electrical Code also requires the disconnect. In order for this system to provide
protection, the power
must be disconnected when the scoreboard is not in use. The
control console should also be disconnected from power and from the signal junction
box when the system is not in use. The same surges that may damage the
scoreboard’s driver can also damage the console’s circuit.
5.6 Troubleshooting
This section lists potential problems with the scoreboard and indicates possible
causes and corrective actions. This list does not include every possible problem, but
does represent some of the more common situations that may occur.
Figure 6: Digit Designation