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Chapter 5. Symptom-to-FRU index
The following table contains troubleshooting information to help you solve some of
the basic problems you might have with your expansion unit. It contains the
problem symptoms and suggested actions to take to resolve the problem.
Table 5. Troubleshooting information
Component
Problem indicator
Drive CRU
Amber LED on
ESM
Front panel
All CRUs
All green LEDs off
Drive CRUs
Amber LED flashing
Power supply
CRU
Power supply
Amber LED on and
CRU
green dc power LED
off
Power supply
Amber LED on and
CRU
green ac power LED
off
Drive CRU ID=6
Green LED on
© Copyright IBM Corp. 2002
Possible cause
Possible solutions
Drive failure
Replace the failed hard disk drive. See "Replacing a
hot-swap hard disk drive" on page 25.
Board failure
Replace the failed ESM. See "Replacing an ESM"
on page 27.
General machine
Indicates that a status or fault LED somewhere on
fault
the expansion unit is turned on. Check for amber
LEDs on CRUs. See "Expansion unit controls,
LEDs, components, connectors" on page 7.
The expansion unit
Check that all expansion unit power cables are
is turned off
plugged in and the power is on. If applicable, check
that the main circuit breakers for the rack are turned
on.
If configuration switch SW1 is set to Off, the SCSI
controller must be cabled to the expansion unit and
turned on.
ac or dc power
Check the main circuit breaker and ac or dc outlet.
failure
Power supply
Replace the power supply. See "Replacing a
failed
hot-swap power supply with fan unit" on page 28.
Midplane failure
Replace the chassis assembly.
Drive rebuild or
No corrective action is needed.
identity is in
process
Fan failure
Replace the power supply. See "Replacing a
hot-swap power supply with fan unit" on page 28.
Power supply
If the power switch is on, replace the power supply
failure or power
CRU. See "Replacing a hot-swap power supply with
supply is turned
fan unit" on page 28.
off.
No ac power to
If ac power is good at the source, replace the power
power supply.
cord. If the power supply has failed, replace the
Check the ac
power supply. See "Replacing a hot-swap power
power cord (cable)
supply with fan unit" on page 28.
or breaker
Cluster
If not currently configured for clustering, power cycle
configuration
the expansion unit to reenable ID=6.
31
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