System Board Removal; Removing The Power Supply Screws - NEC SP B-Series Service And Reference Manual

4. At the back of the system unit, remove the two screws securing the power
supply to the system unit (see the following figure).
5. Pull the power supply out of the system unit.

System Board Removal

Remove the system board per the following steps.
1. Remove the system access cover, expansion boards, fan assembly, and
power supply as previously described.
2. Remove and label all cables connected to the system board. Appendix B,
"Connector Pin Assignments," provides the connector identifiers and pin
assignments for each connector.
3. Locate and remove the one screw at the rear of the unit that secures the
system board to the system unit (see the following figure).
5-10 Disassembly and Reassembly

Removing the Power Supply Screws

A – Power supply screws