IBM 4247 Maintenance Information page 57

Figure 10 shows the location and orientation of the Model 001 (late-level) logic board generator microcode
modules, U54 and U2.
Figure 10. U54 and U2 Microcode Modules Label (Late-Level)
Use Figure 8 on page 56, Figure 9 on page 56, Figure 10, and Figure 11 on page 58 to verify that the information
on the U54 and U2 module labels matches your host connection feature.
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Chapter 1. Diagnosing Problems