HP HEWLET VECTRA VA 6/XXX manual Humming Noise

Page 56

3 Troubleshooting Your PC

If Your PC Has an Audio Problem

Audio Input from the Microphone is Too Low, or No Audio At All

Humming Noise

Check that the microphone specifications meet the requirements of the 16-bit sound components. The microphone should be a 600-ohm dynamic type.

If the power grounding of your audio components is inadequate, a humming noise may be generated. This may happen if your PC is connected to a hifi system. Plug all devices into adjacent power outlets (outlets within 5 cm / 2 inches of each other), or use line filters.

Occasional Crackles

When Playing Back

Sounds

The PC Hangs While Recording

These crackles are usually the result of your PC being unable to transfer audio samples within the required time. A solution is to use a lower sampling rate. Recording and playing back at 22 kHz is less demanding upon system resources than recording audio at 44 kHz.

Uncompressed digital audio can eventually fill your hard disk. For example, one minute of stereo sound recorded at a resolution of 44 kHz will occupy about 10.5 MB. Before recording, check that there is enough free space on your hard disk.

Data compression can reduce the space required. The A-law and μ-law hardware compression used by the audio interface enables the sampling of sound at a resolution of 16-bits, but it generates the same quantity of data as an 8-bit sample.

46

Image 56

Contents User’s Guide Page User’s Guide Important Safety Information Who this Manual is ForImportant Ergonomic Information Page Contents Installing Memory Installing Mass Storage DevicesInstalling Accessory Boards Installing an OverDrive ProcessorIf Your PC Has a Software Problem HP Summary Screen and Setup ProgramHewlett-Packard Information Services Setting Up and Using Your PC When you receive your PC, unpack all the components AccessoriesUnpacking Your PC Try to move it without helpConnecting the Mouse, Keyboard, Display and Printer Connecting Audio Accessories Down before connecting headphones or speakersVolume control in that position Damage your hearingConnecting the Power Cables Connectors are shaped to go in one way onlyTo grounded outlets PC is as class 1 laser productStopping Your PC Starting and Stopping Your PCStarting Your PC Setting Passwords Setting an Administrator PasswordSetting a User Password Password, onThen press ActionUsing Power Management Additional Information and HelpSetting Up and Using Your PC Additional Information and Help How to Install Accessories In Your PC Before switching it on again Accessories You Can InstallAccessory part numbers Removing the Cover Replacing the Cover after Installing AccessoriesRemoving and Replacing the Cover Removing the Air Flow Guide Static electricity can damage electronic components Installing MemoryMain Memory Modules How to Install Accessories In Your PC Installing Memory Upgrading the MGA Millennium Board Memory Switch Use Switch Block to Installing Mass Storage Devices Hard disk drive DrivesYou install additional devices Configuration Connections to Data CablesInstalling an Additional Hard Disk Drive Install any other accessories, before replacing the cover Not attempt to make any adjustment of the laser unit Connectors are shaped to go in one way only. See InternalConnectors on page 20 for more information about which Connectors to useTo Install a Drive Configuring non-Plug and Play ISA Accessory Boards Installing Accessory BoardsConfiguring Accessory Boards with Plug and Play Installing the Board Secure the board Installing an OverDrive Processor Processor processor Troubleshooting Your PC Solving Problems HP Summary ScreenDisplay is Blank and There Are No Error Messages If Your PC Does Not Start ProperlyIf you are Unable to Change any Values in Setup Action Reference Check all internal cablesIf a Post Error Message is Displayed Clearing the PC’s Configuration Memory Clear the configurationIf Your PC Has a Hardware Problem If Your Keyboard Does Not WorkDisplay Does Not Work Properly Ensure that the keyboard is correctly connectedIf Nothing is Displayed on the Screen Ensure that the mouse is correctly connected If Your Mouse Does Not WorkIf Your Printer Does Not Work If the Flexible Disk Drive Does Not Work If the Hard Disk Does Not WorkIf the CD-ROM Drive Has a Problem Not WorkIf an Accessory Board Does Not Work CD-ROM Drive is Idle If Your PC Has a Software Problem If You Have Forgotten Your PasswordIf Your Application Software Does Not Work If the Date and Time are IncorrectIf Your PC Has an Audio Problem Humming Noise Changing the Battery From most local storesTroubleshooting Your PC Changing the Battery Bus Switch1 Technical Information Needed for TroubleshootingSystem Board Switches Power Consumption HDD AccessoriesAll measurements are in watts rms 180 MHz 200 MHz OffIRQs, DMAs, and I/O Addresses Used by Your PC HP Summary Screen and Setup Program HP Summary ScreenUsing the HP Setup Program VA/6xxx Copyright 1995 Hewlett-Packard GZ.xx.xxSettings and exit the Setup program I nTroubleshooting Your PC HP Summary Screen and Setup Program Troubleshooting Your PC HP Summary Screen and Setup Program Hewlett Packard Support and Information Services Service Means of Access IntroductionYour HP Authorized Reseller HP SupportPackHP Support Assistant CD-ROM Region Phone Number Fax NumberAt the CompuServe ! prompt, type GO HP Hewlett-Packard Information ServicesHP Forum on CompuServe HP Forum on America Online HP BBS Library HP World Wide Web SiteCountry Number Baud Rate World-Wide Web URLAccess Method HP FAXback on Demand-HP FirstHP Audio Tips USA only HP Automated Support Directory Country/RegionAustralia Asia Pacific Ordering Drivers and Bios on DisketteEurope HP Support Services Country Language Local Number Hewlett-Packard Telephone SupportNumber is +1 970 Lifeline Telephone Support Number Method of Payment Charge TypeHP Network Phone-in Support Service NPS Summary Covered Time Available FromHewlett-Packard Marketing Headquarters AsiaPage Glossary Glossary Index URL Regulatory Information and Warranty Regulatory Information FCC for USA only Noise Declaration for Germany HP Hardware Warranty Customer Responsibilities HP Software Product License Agreement HP Software Product Limited Warranty Your HP Vectra PC Physical Characteristics Setup HP User’s Guide Troubleshooting and Support HP HelpReference HP Help