5 If the 7133 has a Remote Power On Control feature, ensure that no using systempower-control cables are present at the MAIN and AUX connectors 3.Back view6 Follow your local procedures and check the grounding of the 7133. Any testequipment must be connected to the frame of the 7133.If the grounding is not correct, unplug the power cable from all thefan-and-power-supply assemblies in the 7133, and continue with step 7.7 Check for continuity between the frame of the 7133 and the ground pin 4 of themainline-power connector.Chapter 1. Reference Information 1-63

IBM 7133 Series Service Manual