IBM RT PC 10 Hardware Maintenance And Service page 134

Step 3
1. Set the power switch on the system unit to Off.
2. Remove the new processor board now in slot A and the memory board
now in slot C and record the type.
3. Exchange the system board. Install only the original processor board in
slot A and the memory board in slot C.
4. Set the power switch on the system unit to On.
5. Wait two minutes, then answer the following question.
IS "23" DISPLAYED IN THE TWO-DIGIT DISPLAY?
YES Set the power switch on the system unit to Off, then go to "Step
5" on page 3-91.
NO Set the power switch on the system unit to Off.
1. Remove the new system board and install the original system
board.
2. Exchange the memory board in slot C.
3. Go to "Step 5" on page 3-91.
Problem Isolation Charts
3-89