Sonnet Technologies Crescendo_L2 Processor Upgrade - Manual (Page 35)

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Power Macintosh 6400, 6500, and Performa 64XX Installation
3. Open your Power Macintosh by first removing the two security
screws (Figure 1) on the back of the computer with a medium
Phillips screwdriver.
4. Prior to removing the logic board, touch any metal on the vertical
plate (Figure 2) to discharge any potential damaging static
electricity. Firmly grasp the two protruding plastic tabs (Figure 2)
on the vertical plate and slide the logic board out of the computer.
Figure 1: Remove the two security screws
Figure 2: Grasp tabs and slide out logic board
tab
vertical plate of
logic board
tab
security screw
security screw