IBM RT PC 10 Hardware Maintenance And Service page 128

Step 5
1. Exchange the memory board in slot C.
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.
cf
e
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 memory board from slot C.
2. Look at the memory board type you recorded, then install the
original memory board in slot C.
3. Go the the next page.
Problem Isolation Charts 3-83