Field Replacement Strategy; Precautions; Electrostatic Discharge Precautions - HP StorageWorks HSG80 Array Controller V8.7 Maintenance And Service Manual

Common Replacement Information and Procedures

Field Replacement Strategy

StorageWorks authorized service providers will troubleshoot HSG80 subsystem
problems to the field replaceable unit (FRU) and replace the defective unit.
Replacement procedures for Subsystem FRUs addressed in this guide include the
array controller, cache module, DIMMs, ECB, and GLM.

Precautions

To prevent accidental damage to subsystem components, always follow the
precautions in this section when carrying out the procedures in this guide.

Electrostatic Discharge Precautions

Static electricity collects on all non-conducting material, such as paper, cloth, and
plastic. An electrostatic discharge (ESD) can easily damage a controller or other
subsystem component even though the discharge might not be seen or felt. ESD is a
common problem and might 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 increases the amount of static electricity.
Observe the following precautions whenever servicing a subsystem or subsystem
component:
• Always use an ESD wrist strap when servicing the controller or other components
in the subsystem. Make sure that the strap contacts bare skin, fits snugly, and that
the strap grounding lead is attached to a bus with a verified earth ground.
• Before touching any circuit board or component, always touch a verified earth
ground to discharge any static electricity that might be present in clothing.
• Always keep circuit boards and components away from non-conducting material.
• Always keep clothing away from circuit boards and components.
• Always use antistatic bags and grounding mats for storing circuit boards or
components during replacement procedures.
• Always keep the ESD cover over the program card when the card is in the
controller. If a card is removed, put the card in the original carrying case.
• Never touch the contacts or twist or bend the program card.
• Never touch the connector pins of a cable when one end is attached to a
component or host.
2–2 HSG80 Array Controller V8.7 Maintenance and Service Guide