IBM 6151 Maintenance And Service Manual page 197

Step 20
Look at the SRN.
4. Write the Service Request Number here:
3 - 821 - 741
A.rZBlifi
IS THE DEVICE NUMBER A "7"?
YES Exchange the FRUs listed below in the order listed. Test
each FRU by powering the system unit on and observing
the two-digit display. Ifthe POST ends with a blank
two-digit display, the last FRU exchanged was the failing
FRU. If you identify a failing FRU, use the removal and
replacement procedures in the section that applies to the
FRU and exchange it; then go to "Step 25" on
page 3-0060-27. If you cannot identify a failing FRU,
contact your service support person.
1. RT PC 6192 Expansion Board
2. RT PC Expansion Unit Adapter
3. The Receiver Card in the RT PC 6192.
NO Continue on the next page.
(6/88) Problem Isolation Charts 3-0060-21