IBM 847681U Hardware Maintenance Manual - Page 53
Power supply, The Front Fan and Disk Fan A are controlled by
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Power supply Note The Front Fan and Disk Fan A are controlled by the System Management Controller and the power supply fan is not. If the power-on indicator is not on, the power-supply fan is not running, or the computer will not power-off, do the following. Check/Verify 1. Check the following for proper installation. Power Cord On/Off Switch connector On/Off Switch Power Supply connector System Board Power Supply connectors microprocessor(s) connection 2. Check the power cord for proper continuity. 3. Check the power-on switch for continuity. FRU/Action Reseat Power Cord Power-on Switch If the above are correct, check the following voltages. Attention These voltages must be checked with the power supply cables connected to the system board or riser card. 1 10 11 Pin Signal 1 3.3 V 2 3.3 V 3 COM 4 5 V 5 COM 6 5 V 7 COM 8 POK 20 Function +3.3 V dc +3.3 V dc Ground +5 V dc Ground +5 V dc Ground Power Good IBM Netfinity 3000 - Type 8476 45
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