IBM 6150 Hardware Maintenance Manual page 292

Step 3
TNL SN20-9843 (03-27-87) to 75X0152
One of the removed adapters is failing.
1. Set the power switch on the system unit to Off.
2. Install one of the adapters beginning with the display adapter.
3. Insert the Diagnostics 1 (DIAG-l) diskette in diskette drive A and close
the drive.
4. Be sure the power has been off 30 seconds, then set the power switch
on the system unit to On.
5. Wait 4 minutes, then answer the following question.
ARE THE "DIAGNOSTIC OPERATING INSTRUCTIONS"
DISPLAYED?
YES Repeat the above steps.
NO Set the power switch on the system unit to Off.
1. The last adapter installed or a FRU attached to it is failing.
Use the removal and replacement procedures in the section for
the type adapter and exchange the adapter or FRU attached to
it.
2. Continue on the next page.
(3/87) Problem Isolation Charts 3-9840-3