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4-22 Chapter 4: Hardware ServiceCaution: The 7453-2xxx and 7453-3xxx processors are keyed sothey can be inserted only one way. The 486 and 586 processors arenot keyed and can be installed incorrectly. Be careful to install the486 and 586 processors correctly.4. Unsnap the lever at the side of the processor socket and swing itinto a vertical position as shown in the previous illustration.5. Carefully remove the processor and place it in anti-static packing.6. Correctly position the new processor over the socket and thenguide the pins gently into place. Once it is aligned in the socket,push the processor into the socket until it is fully seated.7. Lock the processor in the socket by swinging the retaining leverdown and snapping it into position.8. Spread some heat-conducting grease on the top of the processorand place the heat sink and fan assembly on the processor.9. Hook the two clips on the fan assembly spring to the tabs on eitherside of the processor socket.10. Install the connectors as described in the following illustrations.
Chapter 4: Hardware Service 4-23Connect to PowerSupply ConnectorClass 35xx 68617923Replacing Processors (7453-4xxx)The Series 4xxx Motherboard uses a Pentium III or Celeron processor.When replacing the processor, the heat sink and fan assembly mustalso be replaced. Processor replacement kits include a processor, and aheat sink and fan assembly. To replace these parts, use the followingprocedure.1. Remove the Base Unit Top as explained in Disassembly Procedures.2. Identify the processor's location (refer to Motherboard illustrationsearlier in this section).3. Remove any components that may obstruct removal of theprocessor.4. Unplug the fan connector.5. Unhook heat sink and fan assembly by pushing in, down, and in onthe clip as shown in the following illustration.
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NCR 7453 WorkstationRelease 3.2Hard
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iSafety WarningsPrefaceAudienceThis
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iiiGrounding InstructionsIn the eve
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vTable of ContentsChapter 1: Produc
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Page 15 and 16: 11Chapter 1: Product OverviewIntrod
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Index-2PCI LCD boardSVGA, 4-71VGA,
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