NEC PowerMate V486 Series Service Manual page 79

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Locate the appropriate SIMM socket.
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Align the notched end of the SIMM with the correct end of the SIMM socket
(see the following figure).
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Insert the SIMM at an angle into the socket.
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Carefully tilt the SIMM towards the locking tabs. Using equal pressure at the
ends of the SIMM, push it until it locks under the metal clips at the ends of
the socket.
Figure Section 3-13 Inserting the SIMM
3. Replace any removed expansion boards and the system unit cover.
4. Connect external peripherals and power cables.
Power on the system.
5.
If there is a discrepancy in the amount of memory that the Power-On Self-Test
finds with the amount of memory that was installed, check that the SIMM sticks
are installed correctly. If the problem persists, see Section 4, Troubleshooting.
Options 3-13