IBM RT PC 10 Hardware Maintenance And Service page 116

Step 4
1.
Set the power switch on the system unit to Off.
2. Unplug the external power cable to the system unit.
3. Connect the large power connector to the system board.
4. Plug in the external power cable to the system unit.
5. Be sure the power has been off 30 seconds, then set the power switch
on the system unit to On.
6. Wait 15 seconds, then answer the following question.
bJD
IS THE POWER-ON INDICATOR ON?
NO Go to "Step 9" on page 3-76.
YES Continue on the next page.
Problem Isolation Charts 3-71