1 Power switch (|/ ): This switch controls the internal dc power that is supplied tothe 7133 by the fan-and-power-supply assemblies.| Note: The diagram shows the Power switch of Model 010. The Power switch of| Model 020 is slightly different.| To turn on the dc power on Model 010, press the switch, and hold it pressed for two| seconds. To turn on the power on Model 020, press and release the switch.Repeat the action to turn off the dc power. When the dc power is turned off, mainlinepower is still present in the fan-and-power-supply assemblies if the 7133 is connectedto the mainline-power source.| The front cover includes a flap that covers the Power switch to prevent accidental| operation. On Model 010, the flap pivots upward to open. On Model 020, the flap| pivots to the right to open.2 Subsystem Power light ( ): This green light is on when the power switch hasbeen pressed to turn on the dc voltage, and the dc voltage is present in the 7133.3 Subsystem Check light ( ): This amber light comes on if a failure occurs in the7133 subsystem. The subsystem might be able to continue operating satisfactorilyalthough the failure of a particular part has been detected.4 Power Card light: This green light is on when electrical power is present on thecard. The light is not visible when the front cover is installed.5 Fan-and-Power Check light: This amber light comes on and stays on if dcoutput from the power supply part of the fan-and-power-supply assembly fails or isdisabled. On 7133s that have the Remote Power On Control feature, the light alsocomes on and stays on when power is turned off at the using system or at theremote-power-on control unit.If the power supply fails completely, the Fan-and-Power light is turned on by powerfrom one of the other fan-and-power-supply assemblies in the 7133. The light flashesif the fan fails.6 Power light: This green light is on when mainline electrical power is present inthe fan-and-power-supply assembly.| The −48 volt fan-and-power-supply assembly has two Power lights, which are related| to the two mainline-power connectors.| 7 Link Status (Ready) light (Model 020 only): This green light shows the status| of the port (for example, port 1) through which the bypass card is connected to the| SSA adapter:| Status of Light| Meaning| Permanently on| The interface through the bypass card is fully operational.| Flashing| (two seconds on,| two seconds off)| The interface through the bypass card is not operational.| Off| The card is in Bypass state or in Forced Inline mode.1-4 7133 Service Guide

IBM 7133 Series Service Manual