Daktronics AB-1600-1.5,2.5 - Manual (Page 45)

Maintenance & Troubleshooting
4-9
Predicted lamp life is for lamps operating in a laboratory with continuous operation in a stable
temperature and mechanical environment. Actual lamp life will differ from predicted life due to
switched operation, varying temperature, mechanical vibrations due to wind, traffic and display
service, and actual hours of operation.
Typically, lamp failures for the 17,000 hour 11.0 volt lamp in the 1-
Ol displays may be as follows.
Y
3% of the lamps normally fail upon reaching 35% of rated life (5,950 hours).
Y
10% of the lamps normally fail upon reaching 70% of rated life (11,900 hours).
Y
50% of the lamps normally fail upon reaching 100% of rated life (17,000 hours).
The balance of 50% of the lamps last longer than the rated life of 17,000 hours.
Example: The following chart shows predicted lamp failure for various displays based on a lamp
voltage of 11.0 volts, assuming the display is in operation for 18 hours a day. This chart is based on
the manufacturers’ test data and on laboratory conditions.
Lamps in this display are accessed either by removing the lampbank to which the lamps are attached
or by removing the lens in front to the lamp. If just a few lamps here and there need replacing it is
easier to remove the lenses in front of them. If there are many lamps that need replacing on a single
lampbank (five or more) it is easier to remove the lampbank from the lens assembly. Both methods of
lamp removal/lamp replacement are addressed in this sub-section.
Complete the following steps to access and service lamps by
removing a lens
1. Remove the necessary lenses as explained in Section 4.4.
2. As illustrated in Figure 46, remove the bad lamps with
the lens/lamp extractor tool found in the tool kit.
3. Replace the necessary lamps. Use the lens/lamp extractor
if the lamps are hot. Use only Daktronics-approved
lamps of the same wattage.
4. Replace the lenses as explained in Section 4.4.
The Diagnostics Method of Lamp Testing & Replacement
A qualified individual who is capable of operating the controller equipment should do lamp
testing.
The Venus 7000 Diagnostics program provides two ways to check for bad lamps. If the display is
not visible from the controller, you must use the Pattern Test method. If the display is visible
from the controller, you can use the Pixel Locator method that allows you to locate bad lamps
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Figure 46: Lamp Removal