Daktronics BA-515 - Manual (Page 35)

8.4 Fuses
Reference Drawings:
Layout, 16 Column Driver III ................................................................. Drawing A-123940
Layout, 8 Column Driver III ................................................................... Drawing A-123941
The digit lamp driver has 17 fuses. There is one fuse to protect each digit circuit. F1 through F16 are
located near each output connector under the driver’s metal cover. The lamp driver’s other fuse, F17
protects the driver’s logic circuit and fan. Refer to Drawings A-123940 and A-123941for an
illustration of the driver and these fuses. Refer to Section 8.8 to determine the part numbers for
replacement fuses.
8.5 Segmentation
Reference Drawing:
Digit Segments, 3x5 and 4x7 .................................................................. Drawing A-46653
In each digit, certain lamps always go on and off together. These groupings of lamps are referred to as
segments. Drawing A-46653 shows the segmentation of 3x5 and 4x7digits, which connector pin is
wired to each digit segment and the wiring color code used in all driver-to-lamp connections.
8.6 Power On Self-Test
Reference Drawings:
Incandescent Driver Power Up Self-Test .............................................. Drawing A-128283
Power Up Self Test on a FB-1424 ........................................................ Drawing A-128301
The scoreboard performs a self-test each time that power is turned on and the control console is
powered off or not attached to the scoreboard. If the control console is attached and powered on, the
self-test does not run and data from the control console is displayed on the scoreboard after a brief
period of time.
The self-test runs in three cycles or phases. The pattern of the self-test varies depending on the
scoreboard model, number of drivers, and type of digits.
Drawing A-128283 shows how the test pattern displays in the digits when the address (P25)
and protocol (P26) plugs are not plugged into the lamp drivers.
Drawing A-128302 shows the test pattern displayed on a scoreboard that has one lamp driver
with the address (P25) plugged in.
These are the three cycles of the self-test:
Cycle 1: Displays the protocol in digits that are controlled by lamp driver A1. P0 is always
displayed when P26 is not installed.
Cycle 2: Displays the driver number and address in the digits that are controlled by each
driver. A000 is always displayed when P25 is not installed.
Cycle 3: Displays a rotating pattern in all digits. The pattern starts in row 1 and rotates
through row 8 (refer to Drawing A-128283).
Digit Maintenance 8-3
and Troubleshooting