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1. Power supply
2. CEC backplane
3. PCI riser card
Restart the system and perform error log analysis.
Do you get an SRN indicating that a voltage sensor is out of range?
NO
The last FRU exchanged is defective. Go to "MAP 0410: Repair Checkout" on page 45.
YES
Reinstall the original FRU.
Repeat the FRU replacement steps until a defective FRU is identified or all the FRUs have been
exchanged.
If the symptom did not change and all FRUs have been exchanged, go to "Step 1521-13".
If the symptom changed, check for loose cards, cables, and obvious problems. If you do not find a
problem, go to the "Quick Entry MAP" on page 40 and follow the instructions for the new symptom.
Step 1521-13
Check that the wall outlet is properly wired and is providing the correct voltage.
Did you find a problem?
NO
Go to "MAP 1548: Processor Subsystem Problem Isolation" on page 77.
YES
Correct the problem. Go to "MAP 0410: Repair Checkout" on page 45.
Step 1521-14
Because the NAS Gateway 500 has redundant power supplies, it is not necessary to power off the system
when replacing a power supply.
The power supplies are symmetrical, so replacement starts with the unit closest to the system wall of the
system (power supply 1). For instructions on replacing a power supply, refer to "Power supplies" on
page 351.
Notes:
1. Always service first the power supply whose green LED, located on the front of the power supplies, is
out.
2. Before removing a power supply, be sure the redundant power supply is operational by observing the
green LED. The green LED must be on solid.
Replace the following FRUs in order:
1. Power supply #1
2. Power supply #2
Perform error log analysis.
Do you receive an SRN indicating that a voltage sensor is out of range?
NO
The last FRU exchanged is defective. Go to "MAP 0410: Repair Checkout" on page 45.
YES
Reinstall the original FRU.
Repeat the FRU replacement steps until a defective FRU is identified or all the FRUs have been
exchanged.
If the symptom did not change and all FRUs have been exchanged, go to "Step 1521-15" on
page 65.
64
NAS Gateway 500 Service Guide
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