IBM H Series Installation And Service Manual page 96

Step 1540-26
One of the FRUs remaining in the system unit is defective.
Turn the power off, remove the power cable, and exchange the following FRUs in
order:
1. System board
2. I/O board (See notes on page 2-1)
Plug in the power cable and wait for OK on the operator panel display.
Turn the power on.
Does the system stop with code 26800Dxx, 45800000, 4880090A, 4B2xxx00 or
4B2xxx10 displayed on the operator panel?
NO Go to "Map 0410: Repair Checkout" in the Diagnostic Information for Mul-
tiple Bus Systems.
YES Reinstall the original FRU.
Repeat the FRU replacement steps until the defective FRU is identified or
all the FRUs have been exchanged.
If the symptom did not change and all the FRUs have been exchanged,
return to "Step 1540-2" on page 2-39 in this MAP.
2-62
RS/6000 Enterprise Server Model H Series Installation and Service Guide