IBM 6150 Hardware Maintenance Manual page 131

TNL SN20-9850 (05-87) to 75X0152 or 75X0166
Step 18
Be sure the external power cable to the system unit is plugged into the
system unit and an outlet and that the outlet has correct voltage. If
needed, see Section 5.
DID YOU FIND A PROBLEM?
YES If the outlet does not have correct voltage have the customer
correct the problem, otherwise, plug the external power cable in.
This completes the repair.
NO Record SRN 16-880, then go to "Step 2" on page 3-8800-2.
3-0030-18 Service Manual