IBM RT PC 10 Hardware Maintenance And Service page 141

POST Error 23 PIC 9840
Step 1
1. Do the "Top Cover Removal" on page 4-12.
2. Remove the adapters from slots 1 thru 5 and record the type and slot
position of each.
3. Plug the external power cable into the outlet.
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?
NO Go to "Step 3" on page 3-98.
YES Continue on the next page.
3-96 Service Manual