IBM 6150 Hardware Maintenance Manual page 9

viii Service Manual
9. Check the voltage label on the rear of the system unit to ensure it
matches the voltage at your outlet.
10. Check the external power cable for damage.
11. With the external power cable connected to the system unit, check for
0.1 ohm or less resistance between the ground lug on the external power
cable plug and the metal frame.
12. Do the "Side Cover Replacement" on page 4-15.