IBM 8872 Service Guide - Page 68
Light, diagnostic
UPC - 000435813060
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v A new error occurs, causing the system-error LED to be lit again. Light path diagnostic LEDs The following table describes the LEDs on the light path diagnostics panel and suggested actions to correct the detected problems. v Follow the suggested actions in the order in which they are listed in the Action column until the problem is solved. v See Chapter 3, "Parts listing, Type 8872 and Type 8874," on page 93 to determine which components are customer replaceable 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 a trained service technician. Lit light path diagnostics LED with the system-error or system-information LED also lit Description Action All LEDs off (the power LED is lit). No action necessary. OVERSPEC There is insufficient power to power the system. The NON RED and LOG LEDs might also be lit. 1. Add an optional power supply if only one power supply is installed. 2. Use 220 V ac instead of 110 V ac. 3. Reseat the following components: a. Power supply b. (Trained service technician only) Power backplane 4. Remove optional devices. 5. Replace the components listed in step 3 one at a time, in the order shown, restarting the server each time. PS A power supply has failed or has 1. Reinstall the removed power supply. been removed; also see "Power-supply LEDs" on page 57. Note: In a redundant power 2. Check the individual power-supply LEDs to find the failing power supply. configuration, the dc power LED on 3. Reseat the following components: one power supply might be off. a. Failing power supply b. (Trained service technician only) Power backplane 4. Replace the components listed in step 3 one at a time, in the order shown, restarting the server each time. 5. If a 12 V fault has occurred, ac power must be removed before dc power can be restored. LINK There is a fault in an SMP 1. Check the SMP Expansion Port link LEDs to find Expansion Port or SMP Expansion the failing port or cable. cable. Note: The SMP Expansion Port link 2. Reseat the SMP Expansion cables. LED on the failed port is off. 3. Replace the SMP Expansion cables. 4. (Trained service technician only) Replace the scalability cartridge assembly. If the scalability cartridge assembly must be replaced, call for service. 52 IBM xSeries 460 Type 8872 and xSeries MXE 460 Type 8874: Problem Determination and Service Guide