Technical data

2–1
Compaq HSZ80 Array Controller ACS Version 8.3 Maintenance and Service Guide
Chapter 2
Replacement Procedures
This chapter describes the procedures for replacing the controller, cache module,
external cache battery (ECB), power verification and addressing (PVA) module, I/O
module, environmental monitoring unit (EMU), DIMMs, PCMCIA card, and a failed
storageset member. Additionally, there are procedures for shutting down and
restarting the subsystem.
See the enclosure documentation for information about the power supplies, cooling
fans, and cables.
Required Tools
You will need the following tools to service the controller, cache module, external
cache battery (ECB), the Power Verification and Addressing (PVA) module, and the
I/O module:
■ A flathead screwdriver for loosening and tightening the I/O module retaining
screws.
■ An antistatic wrist strap.
■ An antistatic mat on which to place modules during servicing.
■ A Storage Building Block (SBB) Extractor for removing StorageWorks building
blocks. This tool is not required, but it will enable you to work more efficiently.
Electrostatic Discharge
Electrostatic discharge (ESD) is a common problem and may cause data loss, system
down time, and other problems. The most common source of static electricity is the
movement of people in contact with carpets and clothing. Low humidity also
increases the amount of static electricity. You must discharge all static electricity
prior to touching electronic equipment. Follow the precautions in Electrostatic
Discharge Precautions given in the Preface whenever you are replacing any
component.