Daktronics Galaxy AF-3500/3550 - Manual (Page 21)

Maintenance 17
Section 6: Maintenance
Important Notes: Power must be turned OFF before any repair or
maintenance work is done on the display.
Only a qualified individual should service internal electronic
components.
Daktronics Galaxy ® AF-35XX series displays are front accessible,
meaning that access to the internal components is gained by
removing the front modules of the display.
Figure 10 shows the
approximate location of internal components.
6.1 Proper Ladder Use
A ladder can be used to access displays, although it is
not preferable. If a ladder must be used, do not place the
ladder directly against the display face. The pressure from
the two ladder ends, even when covered with pads, is too
concentrated and can damage the LEDs and louvers.
Instead, use a padded or carpeted board across the top of the ladder to
distribute the weight of the ladder evenly when placed against the display
face, as shown in
Figure 11. The padded board should be wide enough to
spread the weight of the ladder across a minimum of two modules.
6.2 Internal Display Access
Access the display interior to perform maintenance or troubleshooting by
removing the front modules.
1. Disconnect power to the display.
2. Locate the latch access fasteners
on the module as shown in
Figure 12. One is centered near
the top and one is centered near
the bottom.
3. With a 1 /
8
” hex wrench, turn the
latch access fasteners a quarter
turn counter-clockwise, as shown
in
Figure 13. Gently pull the
module far enough forward to reach behind it and disconnect the
power and ribbon cables.
4. Disconnect the two ribbon cables from the module by spreading the
tabs on the sides and then lifting the cable head from the jack. Note
the cable connections so they can be reconnected correctly.
5. Unplug the power cables by squeezing the tabs on the sides of the
plug head and pulling out.
6. When ready to reinstall the module, reconnect the cables, making
sure that the tabs are tightly pushed against the cable head. Carefully
Controller
Power
Term.
Panel
Quick Connect
Input Board
Light Sensor
Filters Fans
Power
Supply
Thermostat
Figure 10: Interior Component Locations
Figure 11: Example Ladder Board
1/8 hex
wrench for
access
fasteners
Module Latch
Assembly
Figure 12: Module Latch Locations (20 mm)
Figure 13: Removing a Module