Daktronics 4200 Series Digital Billboard - Manual (Page 21)

17 Testing and Replacing Display Components
Section 6: Testing and Replacing Display
Components
6.1 Testing a Module
Module Status Indicators
Under normal operation, module
indicator LEDs (one on each side
on the back of the module) should
flash once every two seconds.
Refer to Figure 12.
Note: When troubleshooting, it
is important to know that the
module may take up to eight
seconds to change the pattern.
Performing a Module Self-
Test
If a module is blank and has
power supplied to it, you can
perform a module self-test. For
full self-test instructions, refer to
Performing a Daktronics Module
Self-Test in Appendix A.
6.2 Replacing Module Power Supplies
The power supply provides power from the term panel to the module. For the 4200 series of
digital billboards, the module power supply is located on the uprights. Each power supply
typically controls two modules.
Replacing a Module Power Supply
1. Disconnect the power coming from the term panel to the
power supply.
2. Disconnect the power cable from the power supply to the
modules. Refer to Figure 13.
3. Pull the power supply assembly release tab.
4. Gently lift the power supply assembly off the upright.
5. Pull the power supply tab to release the power supply from
the mounting bracket and lift the power supply off the pegs.
Figure 12: Labeled Module Back
Figure 13: Power Supply
Mounted to Upright