IBM RT PC 10 Hardware Maintenance And Service page 129

Step 6
1. Exchange the processor board in slot A.
2. Be sure the power has been off 30 seconds, then set the power switch
on the system unit to On.
3. Wait two minutes, then answer the following question.
3-84 Service Manual
IS "23" DISPLAYED IN THE TWO-DIGIT DISPLAY?
YES Set the power switch on the system unit to Off, then go to "Step
8" on page 3-86.
NO Set the power switch on the system unit to Off.
1. Remove the processor board from slot A.
2. Exchange the system board.
3. Go to "Step 8" on page 3-86.