Daktronics AF-3400-64-R,A - Manual (Page 14)

Most circuit boards and components within this display
carry a label that lists the part number of the unit. If the
Replacement Parts List in Section 4.13 does not list a
circuit board or assembly, use the label to order a
replacement.
Figure 6 illustrates a typical label. The part
number is in bold.
Figure 6: Typical Label
Introduction 1-8