IBM 6151 Maintenance And Service Manual page 381

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Step 11
1. Set the power switch on the system unit to Off.
2. Remove one of the adapters or boards from the system board.
3. Be sure the power has been off 30 seconds; then set the power
switch on the system unit to On.
4. Wait 15 seconds.
5. If the Power-On indicator is off, repeat the steps until the
Power-On indicator is on; then answer the question below.
DID YOU FIND A FAILING ADAPTER OR BOARD?
NO
Exchange the system board; then install all units removed
and connect any cables that are disconnected. Go to "Step
14" on page 3-8800-14.
YES Continue on the next page.
(6/88) Problem Isolation Charts 3-8800-11