© Copyright IBM Corp. 2000
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Chapter 4. Solving problems
This chapter contains information to help you solve some of the simpler problems you
might have with your expansion unit. It contains the problem symptoms and error
messages along with suggested actions to take to resolve the problem.
This chapter also provides instructions on how to obtain service and technical
assistance for your expansion unit and other IBM products that you might plan to use.
Troubleshooting
You can use these charts to find solutions to problems that have definite symptoms.
Problem indicator
Component
Possible cause
Possible solutions
Amber LED on
Drive CRU
Drive failure
Replace the failed drive. Refer to “Replacing
hot-swap drives” on page 28.
ESM board
Board failure
Replace failed board. Refer to “Replacing an
ESM board” on page 31.
Front panel
General
machine fault
Indicates that a Fault LED somewhere on the
expansion unit has been turned on. Check for
amber LEDs and CRUs, Refer to “Rear controls,
indicators, and connectors” on page 6.
Amber LED on and
green LED off
Power-supply
CRUs
Power is turned
off
Turn on all power supplies. Refer to “Rear
controls, indicators, and connectors” on page 6.
Amber and green
LEDs on
Power-supply
CRUs
Power supply
failure
Replace the failed power supply CRU. Refer to
“Replacing an ESM board” on page 31.
All green LEDs off
All CRUs
The expansion
unit is turned off
Check that all expansion unit power cables are
plugged in and the power is on. If applicable,
check that the main circuit breakers for the rack
are turned on.
If the external switch 1 is set to Off, the SCSI
controller must be cabled to the EXP300 and
turned on.
AC power
failure
Check the main circuit breaker and ac outlet.
Power supply
failed
Replace the power supply CRU. Refer to
“Removing a hot-swap power supply/fan unit”
on page 33.
Midplane failure Have the expansion unit serviced.
Amber LED
flashing
Drive CRUs
Drive rebuild or
identity is in
process
No corrective action is needed.
Power supply
CRU
Fan failure
Replace the power supply CRU.
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