Hitachi CBL, Hardware Service Manual

Page: 120 / 292

3–2
Procedures before and after replacing components
Hitachi Unified Storage Hardware Service Guide
Electrostatic discharge precautions
Static electricity can damage the storage system’s static-sensitive
components. To prevent damage, follow these precautions:
When performing the service procedures in this document, observe the
following electrostatic discharge (ESD) precautions:
• Wear an antistatic wrist strip at all times when handling any field-
replaceable unit (FRU). Clip the end of the wrist strap to exposed metal
on frame. For convenience, a wrist strap is supplied with the storage
system. Do not remove the wrist strap until the removal or replacement
procedure has been completed.
• Before handling any FRU, such as a drive, controller, Host I/O Board,
Host I/O Module, Drive I/O Module, or I/O Module (ENC), discharge any
static electricity by touching a grounded surface. Grounded surfaces
include static-dissipating mats (already grounded) or grounded
workstations.
• Remove all plastic, vinyl, and foam material from the work area.
• Remove only one FRU at a time from an operating storage system.
Removing more than one FRU can cause too much cooling air to be lost
from the storage system. After several minutes, this can cause the
storage system to overheat or fail.
• Do not remove a FRU from its antistatic protective bag until you are
ready to install it.
• After removing a FRU from the cabinet, immediately place it in an
antistatic bag or antistatic packaging.
• Handle any card FRU only by its edges and avoid touching the
components or circuitry.
• Do not slide a FRU over any surface.
• Limit body movement (which builds up static electricity) during the
removal and replacement of a FRU.
• Use conductive field-service tools.
• To avoid electric shock when performing a “hot replacement” of a part,
do not wear metallic accessories or a watch and avoid touching “live”
parts of the storage system with a screwdriver or similar tools.