Daktronics AF-3050-20-R,A - Manual (Page 22)

The modem is held in place with the use of plastic rails known as a "snap trac." To replace a failed
modem, disconnect all attached cables and carefully "snap" it out of the rails. Insert the new
modem by first laying one end into the rails of the "snap track," then pivot it up and snap into
place.
4.3 Power Summary
The power routing for the display can be summarized as follows:
1. Incoming power terminates at the termination block (TB41) within the power termination
enclosure. Before leaving the enclosure, the power is sent through a fuse and an RFI electrical
filter.
2. Power for the controller board passes through a transformer located on the controller/power panel.
3. 3VDC power supplies are used to power the modules. Power supplies are pre-set at 3.6 VDC.
4.4 Service and Diagnostics
The following sub-sections address servicing of the following display components:
· transformer, RFI filter and fuse
· controller
· modules, drivers and power supplies
The sub-sections also address any diagnostic LEDs, fuses and signal/power connectors found on the
unit.
On the components are denoted as follows.
Component… Denoted As… Location…
Filter, Transformer
and Fuse 0A-1215-4002 Inside the power termination box (behind module
A202)
Controller 0A-1146-0035 Inside the controller/power panel (behind module
A201)
Modules 0A-1266-2002
0A-1266-2003
Over entire face of the display (includes driver)
Power Supplies 0A-1289-4001
0A-1289-4002
0A-1289-4003
0A-1289-4004
0Z-9854-3300P
0Z-10162-3300P
0Z-10095-300P
0Z10052-3300P Varies by sign size
T ansformer, RFI Filter and Fuse r
Transformer
The transformer is located in the upper portion of the power enclosure (T1). To replace the
transformer, first disconnect all the wires attached to it. Turn off power to the display before
Maintenance and Troubleshooting 4-2