Troubleshooting Charts
Table 3. Expansion Unit Troubleshooting Chart
Problem Indicator
Component
Possible Cause
Possible Solutions
Intermittent or
sporadic power loss
to the expansion unit
Some or all CRUs
Defective ac power
source or partially
plugged power cord
Check the ac power source to the rack. Reseat
all power cables and both power supplies. If
applicable, check the rack's power components
(power units, UPS, and so on). Replace
defective power cords.
Power supply failure
Check for a fault LED on the power supplies
and replace the failed CRU.
Midplane failure
Have the midplane replaced (service
technician only).
One or more green
LEDs off
Power supply CRUs
Power cord
unplugged or switch
turned off
Make sure the cord is plugged in and the
switch is turned on.
Power supply CRU
unplugged
Turn off the power switch. Make sure the
power supply is plugged in properly and
locked in place. Turn the power on again.
One or two drive
CRUs
No activity to the
drives
No action required.
All drive CRUs or
those on one bus
No activity to the
drives
No action required.
Damaged or loose
SCSI cables
Check SCSI bus cables and connections.
ESM board failure
Use RAID management software to check the
SCSI bus status. Have the ESM board
replaced (service technician only).
Midplane failure
Have the midplane replaced (service
technician only).
Several CRUs
Hardware failure
Replace the affected CRUs. If this doesn't
correct the problem, have the ESM board
replaced followed by the midplane (service
technician only).
Chapter 5. Solving Problems
61
Summary of Contents for EXP15
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Page 13: ...Safety Information xi...
Page 19: ...Safety Information xvii...
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Page 118: ...92 IBM Netfinity EXP15 Installation and User s Handbook...
Page 124: ...IBM Part Number 24L7940 Printed in U S A September 1998 24L794...