NEC DIRECTION L Service Manual page 62

3-22 Option Installation
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If you are installing the device in an accessible slot, go to step 6.
To install a 3 1/2-inch device in an accessible slot:
6.
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Remove the plastic blank panel from the selected slot by pressing the panel tab
inward and swinging the blank panel out (see Figure 3-21).
Figure 3-20 Inserting the Device
Figure 3-21 Removing the Blank Panel