Lights and Power SwitchThe 7133 has lights that show the status of the subsystem. It also has a power switch.Each disk drive module has lights that show the status of that module.Subsystem Lights and Power SwitchUnless otherwise stated, the lights described in this section remain visible when the covers| of the 7133 are installed. The lights at the back of Models 010 and 020 are not visible| when the back door of the rack is closed. The diagrams in this section show the 7133| with covers removed.| Lights and Power Switch (Models 010 and 020)Front viewBack view (220 volts)Back view (-48 volts)Chapter 1. Reference Information 1-3

IBM 7133 Series Service Manual