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Step 1521-9
Are all the ac power cables seated firmly and connected correctly from the rack
power distribution unit(s) to the rack drawers?
NO
YES
Step 1521-10
Follow the ac power cable(s) from the primary I/O drawer to the appropriate power
distribution unit.
Is the power distribution unit power LED on?
NO
YES
Step 1521-11
Note: Read the Danger and Caution notices under "Safety Notices" on page xi before
Perform the following:
1. Disconnect the ac power cable(s) from the power distribution unit that supplies
power to the primary I/O drawer.
2. Use a multimeter to measure the ac voltage at the power distribution unit socket(s)
where the ac power cable(s), just removed, was (were) attached.
Is the ac voltage from 200 V ac to 240 V ac?
NO
YES
Fix the connection.
This ends the procedure. Go to "Map 0410: Repair Checkout" in the
Diagnostics Information for Multiple Bus Systems .
Go to "Step 1521-10".
Go to "Step 1521-14" on page 95.
Go to "Step 1521-11".
continuing with this procedure.
Replace the power distribution unit.
This ends the procedure. Go to "Map 0410: Repair Checkout" in the
Diagnostics Information for Multiple Bus Systems .
Go to "Step 1521-12" on page 94.
Chapter 3. Maintenance Analysis Procedures
93
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