Daktronics AB-1600-1.5,2.5 - Manual (Page 47)

Maintenance & Troubleshooting
4-11
2. Plug the test table into a standard 120-volt outlet. Make sure the power switch is OFF.
3. Place the 4-pin jumper plug in J2 for the 1 ½” 8x16 lampbank.
CAUTION: Never insert jumpers into both J1 and J2 at the same time.
4. Attach power cable from J44 to the power plug of the lampbank.
5. Attach signal cables to the lampbank. The cable from J35 attaches to the input jack of the
lampbank and the cable from J42 attaches to the output jack of the lampbank. For lampbanks
with piggyback boards, connect the signal wire from the test fixture directly to the lampbank
input.
6. Turn power switch ON and mark all bad lamps with a piece of masking tape.
Note: Do not remove or replace lamps with the power ON as this may damage the
lampbank.
7. Turn fixture power OFF.
8. Replace all lamps with Daktronics approved lamps of the same wattage.
9. Turn test fixture power on and check if all lamps light up. If lamps don’t light properly, check
the troubleshooting section of the maintenance manual.
10. Test the lampbank output.
11. Unplug the lampbank and return it to the display.
4.6 Lampbanks
A self-contained lamp driver display
board controls the lamps of the
displays; the lamps also mount to this
board. This circuit board receives
display information from the controller
and converts it to drive signals, which
switch the lamps. The circuit board has
all the drive components integrated
onto the same circuit board as the lamp
sockets. Refer to Figure 47 for an
illustration of the lamp driver display
board.
After installation of lamps in the circuit
board, it becomes a lampbank. There is
one eight pixels high by 16 pixels wide
lampbank mounted on the back of each
lens assembly. When a lampbank
mounts on the back of the lens/reflector
assembly, the lamps extend into holes
in the back of the reflector shells,
allowing the reflectors and louvers to
direct the light.
The functions of the labeled components are explained in the following table.
Component Function
Power LED A lit LED indicates the lampbank is receiving its operational voltage
of 5 VDC.
J1-Power Power from a transformer enters the lampbank at this connector.
Figure 47: Lampbank Components