Daktronics AB-1600-1.5,2.5 - Manual (Page 42)

Electrical Installation 3-16
If the controller is not running, the display will blank after it has run through the power up test pattern.
If the controller is running, the graphics or video will appear when power is restored.
3.13 Lamp Voltage Check
The final step in display installation is the checking of lamp voltages. Excessive voltage to the lamps
will cause premature burnout while insufficient voltage will hinder the display’s effectiveness. Make
sure the sign is on bright
Although a line voltage check was completed prior to installation, the lamp voltage test should still be
done. This test will bring to light any internal problems, such as a transformer damaged during shipping
that could result in excessive voltage being sent to the lamps.
Complete the following steps to test lamp voltages.
1. Turn on the power to the display and configure the display to have 50% of the lamps on per
module. This can be done by either:
•
creating a static sequence with alternate columns on, or
•
selecting the sequence from the appropriate controller manual under the diagnostics section.
Refer to the Controller Manual for more information on setting up and running sequences.
2. Locate two modules powered by the same transformer.
3. Remove a lens and an ON lamp from any column from one of the above modules. Lens removal
and replacement is addressed in Section 4.4. Figure 39 illustrates the use of the lamp removal
tool.
4. Insert the lamp voltage tester into the empty lamp socket.
5. Place the probes of the voltage tester leads into the holes of the lamp voltage tester (Figure 40).
Record the lamp voltage reading on each of the “1600 Series Display Power Report” forms found
in Appendix B. The table in Section 3.3 lists expected lamp life based on line and lamp voltages.
L
USE EXTREME CAUTION!
Do not short across the terminals of the voltage tester. Doing so will damage the module
electronics.
6. Repeat the above steps for at least two more modules.
7. Carefully replace the lamps and lenses.
Remember to record the lamp voltage readings on each “Display Power Report” found in
Appendix B. Return one of the forms to Daktronics Customer Service.