IBM 6150 Hardware Maintenance Manual page 164

Step 5
TNL SN20-9850 (05-87) to 75X0152 or 75X0166
1. Exchange the System Board.
2. Run System Checkout.
TESTING
COMPLE~~]
DIAG-2
No !rouble was found.]
Press Enter to continue.
WERE YOU ABLE TO LOAD AND RUN SYSTEM CHECKOUT
AND DID THE "NO TROUBLE WAS FOUND" MESSAGE
DISPLAY?
YES This completes the repair.
NO Go to "Step 19" on page 3-0060-20.
(5/87) Problem Isolation Charts 3-0060-5