Compaq 1245 specifications System DMA, Hardware DMA System Function

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Maintenance & Service Guide

Presario 1200 Series

Model: 1245

Home Page Notice Preface Product Description Troubleshooting Illustrated Parts Catalog Removal & Replacement Procedures Specifications Pin Assignments Battery Pack Operations

Specifications

System DMA

	System DMA

Hardware DMA			System Function

0

1

2

3

4

5

6

7

ES1869 Plug and Play AudioDrive

ES1869 Plug and Play AudioDrive

Standard Floppy Disk Controller

(free)

Direct memory access controller

(free)

(free)

(free)

Return to the index list of Specifications.

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Contents Maintenance & Service Guide Maintenance & Service Guide Preface SymbolsProduct Description CompaqHard Drive CD Drive 24× MAX Modem Models & FeaturesBattery ES NiMH System Memory 32 MB Display 12 HPA ProcessorControls and Lights Front Panel ComponentsLeft Side Components Right Side Components Bottom of Unit Rear Connectors Power Management for Windows Power Management Settings Power Management PropertiesDisplay Properties Sleep Mode To Initiate To End Indicators Hibernation ModeRebooting After a Lockup Servicing Your Computer Full Off Mode Illustrated Parts Catalog System Unit Place cursor over each device to obtain its part numberPlace cursor over each device to obtain its part number BoardsDisplay Assembly Place cursor over each device to obtain its part number Mass Storage DevicesMiscellaneous Cables Kit Cables Power CordMiscellaneous Hardware and Plastics Kit Miscellaneous Hardware and Plastics KitMiscellaneous Parts Documentation and Software DescriptionSpare Part Number Serial Number Location Removal and Replacement ProceduresGenerating Static Electrostatic DischargeService Considerations Cables and Connectors Select the desired illustrationPlastic Parts ZIF Connectors Ribbon cable position for the 3.2-GB hard drive Ribbon cable position for the CD drive Ribbon cable position for the diskette drive Back to Cables and Connectors Preparing the Computer for Disassembly To remove the battery pack, complete the following steps Removing the Battery PackReplacement Procedures Removing the Palmrest Cover with Touch Pad Prepare the computer for disassemblyWhen replacing the palmrest cover, ensure Return to Removal Removing the Heatspreader Removing the Keyboard Removing the Processor To replace the processor complete the following steps Maintenance & Service Guide Removing the Hard Drive Presario 1200 Series Models Replacement Procedures Removing the CD Drive Maintenance & Service Guide To replace the CD drive, reverse the previous procedures Removing the Battery Charger Board Removing the Modem To replace the modem, reverse the previous procedures Removing the Display Panel Assembly Maintenance & Service Guide Maintenance & Service Guide Maintenance & Service Guide When removing the display panel assembly Return to Removal Removing the Upper CPU Cover Removing the Speaker Assembly Removing the Diskette Drive Fan Assembly System Board Dip Switch Settings Memory ModuleReplacement Procedures System Board Dip Switch Settings Memory Module Removing the Fan AssemblyTo replace the fan assembly, reverse the previous procedure Removing the System Board Remove three standoffs from the system board Maintenance & Service Guide Remove three screws from the system board To replace the system board, reverse the previous procedures Memory Module Removing the Memory ModuleReplacement Procedures Physical and Environmental SpecificationsSystem Interrupts System InterruptsHardware System Function System DMA System DMAHardware DMA System Function Address Hex System Function Shipping Configuration System I/O AddressSystem I/O Address System Memory Catalog System Memory CatalogDisplay Memory Expansion Battery Pack EnergyEnvironmental Requirements Diskette Drive Seek Times Logical ConfigurationHard Drives Hard Drives Capacity Per Drive FormattedTypical Transfer Rate 24× CD Drive DimensionsCD Drive Rotational SpeedConnector Pin Assignments Disposing of a Used Battery Pack Battery Pack Operating TimeIncreasing Battery Pack Operating Time Conditioning a Battery PackFollow the Preliminary Steps TroubleshootingRun Computer Checkup Preliminary StepsRecommended Action Power-On Self Test PostRunning Post Probable CauseCompaq Diagnostics Perform Computer Checkup TestView System Information Inspect Shipping Preparation Contacting Compaq SupportRemove the Palmrest Cover with Touch Pad Clearing the Power-on PasswordSelect error codes by number or type Diagnostic Error CodesBefore Replacing Parts Troubleshooting Without DiagnosticsSolving Minor Problems Solving Power Problems Solving PC Card Problems