NEC HX4500 Service & Reference Manual page 120

Replacing the FLASH Board
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Electrostatic discharge (ESD) can damage components; place them
on an antistatic surface. Update the CPU baseboard using an
antistatic wrist strap attached to chassis ground. Observe static
precautions. Use an antistatic wrist strap.
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4-48 Assembly and Disassembly Procedures
Figure 4-31. Replacing the Flash Board
! CAUTION
FLASH Board