IBM RS/6000 Enterprise Server M80 Service Manual page 111

Step 1522-5
Are all circuit breakers reset at the rack power distribution panel?
NO Reset the popped breaker by first turning off, then turning on.
This ends the procedure. Go to "MAP 0410: Repair Checkout" in the RS/6000 and Eserver
pSeries Diagnostic Information for Multiple Bus Systems.
YES Go to "Step 1522-6."
Step 1522-6
Are all the dc power cables seated firmly and connected correctly from the rack power distribution
panel to the rack drawers?
NO Fix the connection.
This ends the procedure. Go to "MAP 0410: Repair Checkout" in the RS/6000 and Eserver
pSeries Diagnostic Information for Multiple Bus Systems.
YES Go to "Step 1522-7."
Step 1522-7
Note: Read the danger and caution notices under "Safety Notices" on page xi before continuing with this
procedure.
Perform the following:
1. Disconnect the dc power cable from each power supply of the CEC drawer.
2. Use a multimeter to measure the adc voltage at the drawer end of each dc power cable.
Is the ac voltage from −40 V dc to −60 V dc?
NO There is no power to the drawer. Refer to the rack documentation to isolate the dc power problem.
The 7014 Series Model T00 and T42 Rack Installation and Service Guide is appropriate for most
systems.
This ends the procedure.
YES Go to "Step 1522-13" on page 95.
Step 1522-8
Are all circuit breakers reset at the rack power distribution unit(s)?
NO Reset the popped breaker.
This ends the procedure. Go to "MAP 0410: Repair Checkout" in the RS/6000 and Eserver
pSeries Diagnostic Information for Multiple Bus Systems.
YES Go to "Step 1522-9" on page 94.
Chapter 3. Maintenance Analysis Procedures
93