IBM 6150 Hardware Maintenance Manual page 309

TNL SN20-9843 (03-27-87) to 75X0152 or 75X0166
I
Step 4
One of the boards removed from slots B, C, or D is failing.
1. Set the power switch on the system unit to Off.
2. Install one of the boards removed from slots B, C, or D.
3. Be sure the power has been off 30 seconds, then set the power switch
on the system unit to On.
4. Wait 2 minutes, then answer the following question.
rc-J
~
IS "5c" DISPLAYED IN THE TWO-DIGIT DISPLAY?
NO Repeat this procedure.
YES Set the power switch on the system unit to Off.
1. The last board installed is failing, exchange the failing board.
2. Go to "Step 5" on page 3-9870-5.
3-9870-4 Service Manual