Daktronics 4000 Series Digital Billboard - Manual (Page 23)

R eplacing Dis play C omponents 17
Figure 25: PLR Self Test
Figure 26: Power Supply
• If an error is displayed, use a known good cable on those ports and run the test a
second time to see if it was the cable causing the error.
• If it continues to show an error, replace the PLR.
4.3 P ower S upply
Required tools: Phillips screwdriver, 5 /
16
" nut driver
Refer to Figure 28 for an example of the power supply.
1. Turn off power to the display.
2. Access the interior of the display.
Refer to Section 3.2.
3. Use a Phillips screwdriver to remove the shroud
that covers the power supply cables and fuses.
4. Disconnect all power and signal cables from the
power supply.
5. Use a 5 /
16
" nut driver to remove the Tek screw
below the finger tab.
6. Pull the finger tab to disengage the power supply,
and then lift the power supply off the hook mount.
7. Reverse Steps 1-5 to replace the power supply.
8. Turn on power to the display.
4.4 Filter
Filters should be checked yearly, except for sites that have
been designated to be checked every six months. Refer to
the table below for filter quantities by display size.
Display Size Filter Quantity
20' x 60' 32
14' x 48' 26
12' x 48' 26
14' x 28' 16
21' x 21' 18
11' x 22' 12
10'6" x 36" 10
10' x 30' 8
10' x 20' 6