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Step 1540-40
The primary I/O drawer is the only I/O drawer that was connected to the system rack.
Note: Before continuing, check the cabling from the system rack to I/O drawers to
1. Turn the system power off.
2. At the system rack, swap cable connections at RIO port 0 and RIO port 1. The
cable end that was connected to RIO port 0 should now be connected to RIO port
1. The cable end that was connected to RIO port 1 should now be connected to
RIO port 0.
3. At the primary I/O drawer, swap cable connections at RIO port 0 and RIO port 1.
The cable end that was connected to RIO port 0 should now be connected to RIO
port 1. The cable end that was connected to RIO port 1 should now be connected
to RIO port 0.
4. Verify that primary I/O drawer RIO port 0 is connected to the system rack RIO port
0.
5. Verify that primary I/O drawer RIO port 1 is connected to the system rack RIO port
1.
6. Verify that primary I/O drawer SPCN port 2 is connected to the system rack SPCN
port 0.
7. Connect the primary I/O drawer SPCN port 2 to the system rack SPCN port 1.
Note: The primary I/O drawer should be cabled as shown in "Connecting RIO and
8. Turn on the power.
Was the boot successful?
No
Yes
ensure that the system is cabled correctly. Refer to "Cabling the System Rack
and I/O Rack" on page 31 for valid configurations. Record the current cabling
configuration and then continue with the following steps.
SPCN Cables" on page 32 for "System Rack Attached to One I/O Drawer."
Be sure examine both RIO cables and SPCN cables.
Go to "Step 1540-12" on page 123.
The RIO cable currently connected to the system rack RIO port 1 is defective.
Replace it. Reconfigure the system to its original condition. Go to MAP 410:
Repair Checkout in Diagnostic Information for Multiple Bus Systems.
Chapter 3. Maintenance Analysis Procedures
133
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