Sonnet Technologies Crescendo_L2 Processor Upgrade - Manual (Page 19)

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8. Slide the logic board out of the computer (Figure 5) and set
it aside.
9. Unpack everything you will need from the packaging box that
contains the Crescendo/L2 card. Close the box. The box will
be used as a relatively soft installation surface to prevent any
damage to components on the bottom of the logic board
during installation.
10. Place the logic board on the box (Figure 6).
Power Macintosh 5400, 5500, and Performa 54XX Installation
Figure 6: Place logic board on packaging box
Figure 5: Slide logic board out of computer