IBM 7026-H80 - RS/6000 - 256 MB RAM Service Manual page 126

Step 1523-13
Check internal drawer cabling from power distribution card to primary I/O backplane.
See "Primary I/O Drawer Internal Cables" on page 483 in Chapter 10.
Disconnect the ac power cable from each power supply. Then replace the following
components in the secondary I/O drawer, one at a time, in the sequence listed. After
replacing, reconnect the ac power cable to each power supply.
v Secondary I/O drawer operator panel
v Secondary I/O drawer backplane
v Power supply (including redundant power supply, if present)
Does the secondary I/O drawer operator panel turn on the power present LED?
NO
YES
Step 1523-14
Is the ac power cable from the secondary rack power distribution unit to the
customer's ac power outlet connected and seated correctly at both ends?
NO
YES
Step 1523-15
Note: Read the Danger and Caution notices under "Safety Notices" on page xi before
Perform the following:
1. Disconnect the mainline ac power cable from the power distribution unit that
supplies power to the secondary I/O drawer.
2. Use a multimeter to measure the ac voltage at the power distribution unit end of the
mainline ac power cable.
Is the ac voltage from 200 V ac to 240 V ac?
NO
YES
108
Service Guide
Contact your next level of support for assistance.
This ends the procedure. Go to "Map 0410: Repair Checkout" in the
Diagnostics Information for Multiple Bus Systems .
Connect the ac power cable correctly at both ends.
This ends the procedure. Go to "Map 0410: Repair Checkout" in the
Diagnostics Information for Multiple Bus Systems .
Go to "Step 1523-15".
continuing with this procedure.
Go to "Step 1523-16" on page 109.
Replace the power distribution unit.
This ends the procedure. Go to "Map 0410: Repair Checkout" in the
Diagnostics Information for Multiple Bus Systems .