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24. At the base system, disconnect the cable connection at RIO port 1 of RIO extender card 2
(U0.1-P1-H2.1/Q8), and reconnect it to RIO port 0 of RIO extender card 2 (U0.1-P1-H2.1/Q7).
25. At the "looped four" I/O subsystem recorded in substep 23 on page 165, disconnect the I/O port
connector 1 (U0.x-P1.1/Q2) and reconnect to the I/O port connector 0 (U0.x-P1.1/Q1) of the "looped
one" I/O subsystem identified in substep 8 on page 164.
26. Verify that a single RIO cable connects base system RIO port 0 of RIO extender card 2
(U0.1-P1-H2.1/Q7) to the I/O subsystem recorded in substep 4 on page 164 port connector 0
(U0.x-P1.1/Q1).
27. If an I/O subsystem was "looped two" verify that the "looped one" I/O subsystem I/O port connector 1
(U0.x-P1.1/Q2) is connected to the "looped two" I/O subsystem I/O port connector 0 (U0.x-P1.1/Q1).
28. If an I/O subsystem was "looped three" verify that the "looped two" I/O subsystem I/O port connector
1 (U0.x-P1.1/Q2) is connected to the "looped three" I/O subsystem I/O port connector 0
(U0.x-P1.1/Q1).
29. If an I/O subsystem was "looped four" verify that the "looped three" I/O subsystem I/O port connector
1 (U0.x-P1.1/Q2) is connected to the "looped four" I/O subsystem I/O port connector 0
(U0.x-P1.1/Q1).
30. At this point a chain of one to four I/O subsystems are attached to RIO port 0 of RIO extender card 2
(U0.1-P1-H2.1/Q7) of the base system.
31. Turn on the power to boot standalone diagnostics from CD.
32. If the Please define the System Console screen is displayed, follow directions to select the system
console.
33. Use the Display Configuration and Resource List to list all attached devices and adapters (refer to the
Eserver pSeries Diagnostic Information for Multiple Bus Systems, order number SA38-0509, if
necessary).
34. Check that all attached devices and adapters are listed.
Did the Please define the System Console screen display and are all attached devices and adapters
listed?
No
Go to "Step 1542-9" on page 151 to further isolate I/O problems attached to the base system RIO
extender card 2 (U0.1-P1-H2.1).
Yes
The RIO cable that was removed in substep 3 on page 161 or 4 on page 161 above is defective.
Replace the RIO cable.
If four I/O subsystems are chained to RIO port 0 of RIO extender card 2 (U0.1-P1-H2.1/Q7) of the
base system, connect the new RIO cable from the "looped four" I/O subsystem I/O port connector
1 (U0.x-P1.1/Q2) to base system RIO port 1 of RIO extender card 2 (U0.1-P1-H2.1/Q8).
If three I/O subsystems are chained to RIO port 0 of RIO extender card 2 (U0.1-P1-H2.1/Q7) of
the base system, connect the new RIO cable from the "looped three" I/O subsystem I/O port
connector 1 (U0.x-P1.1/Q2) to base system RIO port 1 of RIO extender card 2 (U0.1-P1-H2.1/Q8).
If two I/O subsystems are chained to RIO port 0 of RIO extender card 2 (U0.1-P1-H2.1/Q7) of the
base system, connect the new RIO cable from the "looped two" I/O subsystem I/O port connector
1 (U0.x-P1.1/Q2), to base system RIO port 1 of RIO extender card 2 (U0.1-P1-H2.1/Q8).
If the I/O subsystem was "not looped left," connect the new RIO cable from the I/O subsystem
recorded in substep 3 on page 161 I/O port connector 1 (U0.x-P1.1/Q2), to base system RIO port
1 of RIO extender card 2 (U0.1-P1-H2.1/Q8).
If the I/O subsystem was "not looped right," connect the new RIO cable from the I/O subsystem
recorded in substep 4 on page 161 I/O port connector 1 (U0.x-P1.1/Q2), to base system RIO port
1 of RIO extender card 2 (U0.1-P1-H2.1/Q8).
Reconfigure the system to its original condition. Go to "Map 0410: Repair Checkout" in the
Eserver pSeries Diagnostic Information for Multiple Bus Systems.
166
EserverpSeries 650 Service Guide
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