NEC SP B-Series - Manual (Page 80)

Disassembly and Reassembly 5-3
!
CAUTION
When handling boards or chips, ground yourself to release
static.
Disassembly
Use the following procedures to disassemble the system unit.
Note: Unplug the power cord before disassembling the
system unit. Voltage is present inside the system unit even
after the power is off. All voltage is removed only when the
power cord is unplugged.
System Access Cover
To remove and replace the system access cover, see Section 3, “Option
Installation.”
Expansion Board Removal
Remove any installed expansion board(s) per the following steps.
1. Remove the system access cover as described in Section 3,“Option
Installation.”
2. Disconnect any cables leading from the expansion board(s).
3. Remove the screw that secures the board to the support bracket.
4. Pull the board out of the connector (see the following figure). You might
need to gently rock the board from side-to-side to release it from its
connector.