IBM 7985 Problem Determination And Service Manual

Power-controlbuttonPower-onLEDHard disk driveactivity LEDSystemlocatorLEDInformationLEDSystem-errorLEDReleaselatch2. To view the light path diagnostics panel, slide the latch to the left on the front ofthe light path diagnostics panel. This reveals the light path diagnostics panel. LitLEDs on this panel indicate the type of error that has occurred.The following illustration shows the light path diagnostics panel.DASDNMIPCIPS1SPPS2CNFGMEMCPUFANVRMOVER SPECTEMPREMINDS ERRLight PathDiagnosticsRAIDBRDNote any LEDs that are lit, and then push the light path diagnostics panel backinto the server.Look at the system service label on the top of the server, which gives anoverview of internal components that correspond to the LEDs on the light pathdiagnostics panel. This information and the information in “Light path diagnosticsLEDs” on page 52 can often provide enough information to diagnose the error.3. Remove the server cover and look inside the server for lit LEDs. A lit LED on orbeside a component identifies the component that is causing the error.The following illustration shows the LEDs on the system board.50 IBM System x3655 Type 7985 and 7943: Problem Determination and Service Guide