IBM 6151 Maintenance And Service Manual page 377

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Step 7
1.
Set the power switch on the system unit to Off.
2. Connect cooling fan power connector.
3. Disconnect the smaller power cable connector from the system
board.
4. Be sure the power has been off 30 seconds; then set the power
switch on the system unit to On.
5. Wait 15 seconds; then answer the following question.
IS THE COOLING FAN OPERATING?
NO
Check the external power cable for damage, if none,
exchange the power supply. Go to "Step 14" on
page 3-8800-14.
YES
Continue on the next page.
(6/88) Problem Isolation Charts 3-8800-7