Daktronics BA-1518, Service Manual

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Troubleshooting
13
Power Supplies
Reference Drawings:
Power Supply Enclosure; 300/600/900 Watt .................................................. DWG-3320541
If a certain group of digits is not lighting up, the power supply they are all connected to
may need to be replaced. While most displays only require one 300 W power supply for
each driver, displays with 36" and 48" digits will also have at least one more power supply
located in a separate enclosure (refer to DWG-3320541 ).
Replacing a 300 W Power Supply
1� Open the digit panel or display access panel nearest the power supply as described
in Component Locations & Access (p�5) .
2� Remove the metal cover of the driver enclosure by lifting it up, then back and down
to access the power supply.
3� Locate the power supply ( Figure 9 ) and disconnect all wires connected to it.
4� Use a 9/32" nut driver to remove the hardware securing the power supply.
5� Fasten the new power supply in place and reconnect all wires.
6� Put the metal cover back on the enclosure, securely close the access panel, and
then power up and test the display to verify the issue has been resolved.
Replacing a 1000 W Power Supply (Prior to May 2016)
Reference Drawings:
Enclosure: 1000W Power Supply ....................................................................... DWG-274431
1� Open the digit panel or display access panel nearest the power supply as described
in Component Locations & Access (p�5) .
2� Loosen the screws to remove metal cover from the power supply enclosure.
3� Remove the mounting plate from the enclosure, remove the circuit board attached
to the power supply, and detach the power supply from the mounting plate.
4� Attach the circuit board to the new power supply and secure the power supply to
the mounting plate.
5� Put the metal cover back on the enclosure, securely close the access panel, and
then power up and test the display to verify the issue has been resolved.
Note: If replacing the 1000 W power supply (Daktronics part # A-1856R) does not seem
to resolve the problem, try replacing its circuit board (part # 0P-1337-2000). This
circuit board also contains fuses for each output jack. If a single digit doesn’t
work, a fuse may be blown. Replace the fuse(s) as needed with part # F-1058.