IBM 6151 Maintenance And Service Manual page 389

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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 2 minutes; then answer the following question.
AJZB165
IS "5c" OR "05" DISPLAYED IN THE TWO-DIGIT DISPLAY?
NO Set the power switch on the system unit to Off; then go to
"Step 8" on page 3-9810-8.
YES 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.
(6/88) Problem Isolation Charts 3-9810-5