Chapter 4. Continuous availability and manageability 117
4.4.5 Locating and servicing parts requiring service
The final component of a comprehensive design for serviceability is the ability to effectively
locate and replace parts requiring service. POWER processor-based systems use a
combination of visual cues and guided maintenance procedures to ensure that the identified
part is replaced correctly, every time.
Packaging for service
The following service enhancements are included in the physical packaging of the systems to
facilitate service:
Color coding (touch points)
– Terracotta colored touch points indicate that a component (FRU/CRU) can be
concurrently maintained.
– Blue colored touch points delineate components that are not concurrently maintained.
(Those that require the system to be turned off for removal or repair.)
Tool-less design
Selected IBM systems support tool-less or simple tool designs. These designs require no
tools or simple tools such as flathead screwdrivers to service the hardware components.
Positive retention
Positive retention mechanisms assure proper connections between hardware components
such as cables to connectors, and between two cards that attach to each other. Without
positive retention, hardware components run the risk of becoming loose during shipping or
installation, preventing a good electrical connection. Positive retention mechanisms (such
as latches, levers, thumb-screws, pop Nylatches (U-clips), and cables) are included to
help prevent loose connections and aid in installing (seating) parts correctly. These
positive retention items do not require tools.
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