Troubleshooting Charts
Troubleshooting Charts
You can use the troubleshooting charts in this section to find solutions to problems that have definite
symptoms.
Table 2. Expansion Unit Troubleshooting Chart
Problem Indicator
Component
Possible Cause
Possible Solutions
Amber LED on
Front Panel
Drive failure
Replace failed drive.
Fan CRU
Fan failure
Replace failed fan.
ESM board
Subsystem is
overheated
Check fans for faults. Replace failed fan if
necessary.
Environment too hot
Check the ambient temperature around the
expansion unit. Cool as necessary.
Defective LED or
hardware failure
If you cannot detect a fan failure or
overheating problem, have the expansion unit
serviced.
Amber LED on,
green LED off
Power supply CRU
Power switch turned
off
Turn on the power switch.
Amber and green
LEDs on
Power supply CRU
Power supply failure
Replace failed power supply CRU.
Amber/green LEDs
off
Drive CRU
CRU not plugged in
Make sure that the drive is inserted and
locked in place correctly. If you remove a
drive from its bay, always wait at least 10
seconds before you plug it back into the
expansion unit.
Drive failure
If the drive is locked in place and its
Power/Fault LED remains off, replace the
drive.
All green LEDs off
All CRUs
Subsystem power off
Check that both expansion unit power cords
are plugged in and both power switches are
on. If applicable, check that the rack's main
circuit breakers are turned on.
ac power failure
Check the main circuit breaker and ac outlet.
Power supplies
failed
Replace both power supplies.
Midplane failure
Have the expansion unit serviced.
Power/Fault LED off
One or more drive
CRUs
Bad disk drive or
bad midplane
Replace disk drive or have serviced by
technician.
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