IBM 7012 300 Series Installation And Service Manual page 46

Step 3
(from Step 2)
One of the FRUs remaining in the system unit is defective.
To test each FRU, exchange the FRUs in the following order:
1. CPU card
2. L2 cache SIMM if removed from CPU card.
3. System planar
4. Key mode/reset switch assembly
5. Three-digit display
6. Power supply.
The system is working correctly if it stops and the number 213 or the flashing 888 sequence
888-103-12X-X43 (X can be any number) is displayed in the three-digit display. If this
occurs, the last FRU you exchanged is defective.
1. Set the power switch on the system unit to Off.
2. Install one memory card. If the system is a Model 39H, install the removed memory
SIMMs on the CPU card. Verify that all SIMMs installed on the CPU card are the same
size.
3. Set the power switch on the system unit to On.
Is a 213 or the flashing 888 sequence 888-103-12X-X43 (X can be any number)
displayed in the three-digit display?
NO
YES
2-1540-4
Installation and Service Guide
Reinstall the original FRU.
Repeat this step 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, call
your service support person for assistance.
If the symptom has changed, check for loose cards, cables, and obvious
problems. If you do not find a problem, return to Step 1 in this MAP and
follow the instructions for the new symptom.
Go to "Map 0410: Repair Checkout" in the POWERstation and
POWERserver Common Diagnostics and Service Guide.