User`s guide

• When the upper LED is on, all the power supplies on its power bus are
functioning properly.
• When the upper LED is off, at least one of the power supply SBBs on its
power bus is not functioning properly.
• When the lower LED is off, either there is an input power problem or the
power supply is not functioning.
Figure 4–6 3½-Inch Power Supply SBB
COMMON POWER
SUPPLY STATUS
LED (GREEN)
POWER SUPPLY
STATUS LED
(GREEN)
CXO-4325A-PH
4.7 Dual Speed Blower Fault Notification
The SW300 has eight rear-mounted blowers that cool the controllers and storage
devices. Connectors on the backplane provide the +12 V dc power to operate the
blowers. When a blower fails, the appropriate blower LED is illuminated on the
EMU to identify which blower has malfunctioned.
4–8 Error Analysis and Fault Isolation