IBM 366 Problem Determination And Service Manual

Also see for 8863 - eServer xSeries 366: Service guide Service guide Installation guide Installation guide

Light path diagnostic LEDsThe following tables describe the LEDs on the light path diagnostics panel and onthe boards inside the server and suggested actions to correct the detectedproblems.v Follow the suggested actions in the order in which they are listed in the Action column until the problemis solved.v See Chapter 3, “Parts listing, Type 8863,” on page 105 to determine which components are customerreplaceable units (CRU) and which components are field replaceable units (FRU).v If an action step is preceded by “(Trained service technician only)”, that step must be performed only by atrained service technician.Lit light pathdiagnostics LED withthe system-error orsystem-informationLED also lit Description ActionAll LEDs off (thepower LED is lit; theinformation LED mightbe lit).No action necessary.OVERSPEC There is insufficient power to powerthe system. The NON RED andLOG LEDs might also be lit.1. Add an optional power supply if only one powersupply is installed.2. Use 220 VAC input power.3. Reseat the following components:a. Power supplyb. (Trained service technician only) Powerbackplane4. Replace the components listed in step 3 one at atime, in the order shown, restarting the server eachtime.5. Use 220 VAC instead of 110 VAC.PS A power supply has failed or hasbeen removed; also see“Power-supply LEDs” on page 67.Note: In a redundant powerconfiguration, the dc power LED onone power supply might be off.1. Reinstall the removed power supply.2. Check the individual power-supply LEDs to find thefailing power supply.3. Reseat the following components:a. Failing power supplyb. (Trained service technician only) Powerbackplane4. Replace the components listed in step 3 one at atime, in the order shown, restarting the server eachtime.5. If a 240 VA fault has occurred, ac power must beremoved before dc power can be restored.LINK ReservedChapter 2. Diagnostics 63