Dell 6100, 200 manual Jumpers, Switches, and Connectors, Jumpers and Switches General Explanation

Page 135

Appendix C

Jumpers, Switches, and Connectors

This appendix provides specific information about the jumpers on the system board. It also provides some basic information on jumpers and switches and describes the connectors and sockets on the various boards in the computer.

A jumper is referred to as open or unjumpered when the plug is pushed down over only one pin or if there is no plug at all. When the plug is pushed down over two pins, the jumper is referred to as jumpered. The jumper setting is often shown in text as two numbers, such as 1-2. The number 1 is printed on the circuit board so that you can identify each pin number based on the location of pin 1.

Jumpers and Switches—

A General Explanation

Jumpers and switches provide a convenient and revers- ible way of reconfiguring the circuitry on a printed circuit board. When reconfiguring the system, you may need to change jumper settings on the system board. You may also need to change jumper and/or switch settings on expansion cards or drives.

Jumpers

Jumpers are small blocks on a circuit board with two or more pins emerging from them.

Plastic plugs containing a wire fit down over the pins. The wire connects the pins and creates a circuit.

To change a jumper setting, pull the plug off its pin(s) and carefully fit it down onto the pin(s) indicated.

CAUTION: Make sure the system is turned off before you change a jumper setting. Otherwise, damage to the system or unpredictable results may occur.

Figure C-1 shows the location and default settings of the jumper blocks on the system board. See Table C-1 for the designations, default settings, and functions of the sys- tem’s jumpers.

Switches

Switches control various circuits or functions in the computer system. The switches you are most likely to encounter are dual in-line package (DIP) switches, which are normally packaged in groups of two or more switches in a plastic case. Two common types of DIP switches are slide switches and rocker switches (see the following illustration).

slide switches

rocker switches

Each of these switches has two positions, or settings (usually on and off). To change the setting of a slide switch, use a small, pointed object such as a small screw- driver or a straightened paper clip to slide the switch to the proper position. To change the setting of a rocker switch, use the screwdriver or paper clip to press down

Jumpers, Switches, and Connectors

C-1

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Contents 167$//$7,21$17528%/6+227,1**8 Page Safety Instructions When Working Inside the ComputerProtecting Against Electrostatic Discharge When Using the Computer System About This Guide PrefaceNotational Conventions Other Documentation You May NeedExamples autoexec.bat and c\windows Typographical ConventionsPage Contents Chapter Running the System Diagnostics Chapter Checking the Equipment Chapter Installing System Board Options Chapter Installing Drives in the External Bays Before You Call Figures Figure B-1 Column x 25-Line Character Set Subtest Screen Tables Page Dell Confidential Preliminary 12/17/96 Xxiv Is the computer wet or damaged? Checking the BasicsBacking Up Files Basic ChecksRun the system diagnostics as described in Chap- ter Checking Connections and SwitchesBack Panel Features Is the monitor operating properly? Yes. Continue to step Turn on the systemIs the mouse or printer operating properly? Boot Routine IndicationsLook and Listen Is the keyboard operating properly? Yes. Continue to stepSystem Configuration Utility System Setup ProgramMessages and Codes System MessagesSystem Messages CodeMessage System Messages System Beep Codes System Beep CodesAlert Log Messages From the Dell HIP Program Diagnostics MessagesScsi Hard-Disk Drive Indicator Codes Scsi Hard-Disk Drive Indicator PatternsPage Error Messages Finding Software SolutionsInstalling and Configuring Software Using SoftwareAvoiding Interrupt Assignment Conflicts Input ErrorsDefault IRQ Line Assignments Program ConflictsRunning the System Diagnostics Features of the System DiagnosticsWhen to Use the System Diagnostics Sample Diagnostics Menu Starting the System DiagnosticsSample System Diagnostics Main Screen How to Use the System DiagnosticsSelect How to Use the MenuMain Menu Categories RunRun Under Subtest SubtestOption Parameters OptionsTest Limits AboutKey-Help Tests in the System Diagnostics System Diagnostics TestsQuit System Diagnostics Tests System Set Test Group Error MessagesWhy Run a RAM Test? RAM Test GroupWhy Run a System Set Test? Video Test Group Why Run a Video Test?Why Run a Keyboard Test? Keyboard Test GroupMouse Test Serial/Infrared Ports Test Group Why Run the Mouse Test?Why Run a Diskette Drives Test? Diskette Drives Test GroupParallel Ports Test Group Why Run a Serial/Infrared Ports Test?Scsi Devices Test Group Why Run a Parallel Ports Test?Why Run a Scsi Devices Test? Page Troubleshooting the Monitor Run the system diagnostics softwareChecking the Equipment Troubleshooting I/O Ports Troubleshooting the KeyboardTroubleshooting the Basic I/O Functions Check the contents of the start-up filesChange the necessary statements in the start-up files Attempt another print operation on the parallel printer Troubleshooting a Parallel PrinterTroubleshooting a Serial I/O Device Run the parallel printer’s self-testChecking Inside the Computer Safety First- For You and the ComputerRemoving the Computer Covers Removing and Replacing the Computer CoversRemoving the Computer Covers Replacing the Computer CoversRemoving the Front Bezel Inside the ChassisRemove the computer covers Inside the Chassis-Front/Left Side View Responding to a Dell HIP Alert Message Troubleshooting a Wet ComputerVerify all internal cable and component connections Troubleshooting a Damaged ComputerLet the computer dry for at least 24 hours Check all the board and card connections in the computerTroubleshooting the RTC Chip Replacing a Power Supply Troubleshooting Power Supply ProblemsCheck the cable connections listed in Table Troubleshooting a Cooling FanTroubleshooting Power Cable Connections Power Cable Connectors on Power-Supply Paralleling BoardReinstall the fan carrier in the computer Replacing a Cooling FanReplace the left computer cover Reseat the expansion cards in their connectors Troubleshooting Expansion CardsTurn on the system, including any attached peripherals Troubleshooting System MemoryCorrect the system board’s configuration jumper settings Run the RAM Test Group in the system diagnosticsTroubleshooting the Video Subsystem Troubleshooting the System Board Determine whether a video expansion card is installedRemove the video expansion card, and repeat step Disconnect the keyboard and reboot the system Troubleshooting the Diskette Drive SubsystemRepeat steps 1 and 2, and remove all expansion cards Troubleshooting the Diskette Drive Sub- systemChecking the Diskette Drive Subsystem Check the diskette drive cablingTroubleshooting a Scsi Tape Drive Drive Indicator Error Codes Troubleshooting Scsi Hard-Disk DrivesRemove the drive carrier and install it in another drive bay Troubleshooting the Scsi Hard-Disk DriveChecking Inside the Computer Page Installing System Board Options Installing System Board OptionsExpansion Cards System Board FeaturesExpansion Cards Installing an Expansion CardConnect any cables that should be attached to the card Relocating or Removing an Expansion CardMemory Upgrade Kits Simm Installation GuidelinesAdding Memory Sample Simm Configurations Shows the location of the Simm sockets on the memory module Performing a Memory UpgradeInstalling SIMMs Removing SIMMs Valid Microprocessor Configurations Remove the left computer cover Remove the appropriate modules Remove the heat sinkRemove the microprocessor from the socket Unpack the new microprocessor Install the microprocessor in the socket see Fig- ureReplace the microprocessor securing clip Replacing the RTC Chip13. RTC Chip Install the new RTC chipPage Installing Drives in the External Bays Installing Drives in the External BaysExternal Drive Bay Hardware Before You BeginRemoving and Replacing Front-Panel Inserts Connecting the DriveInstalling Scsi Devices in the External Bays DC Power CablesScsi Configuration Information Installing a Scsi Device Prepare the drive for installationRemove the computer covers and front bezel Page Configure the controller card if necessary Remove both computer covers and the front bezel Prepare the tape drive and controller card for installationInstalling Drives in the Internal Bays 10-1 Installing Drives in the Internal BaysInternal Drive Hardware Scsi Hard-Disk Drive ConfigurationInstall any required Scsi device drivers Removing and Installing a Scsi Hard-Disk DriveRemove the hard-disk drive Scsi Hard-Disk Drive Indicator PatternsInstalling Drives in the Internal Bays 10-5 Partitioning and Formatting Scsi Hard-Disk Drives Configuring the Boot DeviceHelp Tools Run the diagnostics for your Dell systemGetting Help Technical AssistanceSystem Documentation World Wide Web on the InternetHelp Tools TechFax Service Commercial Online ServicesDell Diagnostics Program AutoTech ServiceTechConnect BBS Problems With Your OrderTechnical Support Service Product InformationReturning Items for Warranty Repair or Credit Before You CallDell Contact Numbers International Dialing Codes 1344Getting Help 11-7 Belgium Dell Contact NumbersAustralia AustriaCanada ChinaCzech Republic Germany DenmarkFinland FranceKorea IrelandItaly JapanMexico LuxembourgMacau MalaysiaSingapore New ZealandNorway PolandSweden SwitzerlandTaiwan Austin, Texas AutoTech Automated technical support Page Diagnostics Checklist Diagnostics Checklist Video Hardware Test Diagnostic Video TestsText Mode Character Test Video Memory TestCharacter Set Subtest 40 x Character Attributes Subtest 80 xCharacter Set Subtest 80 x Character Attributes Subtest 40 xText Mode Color Test Color Attributes Subtest 80 xTable B-1. Color Attributes Graphics Mode Test Text Mode Pages Test640 x 480 2-Color Graphics Mode Screen 320 x 200 16-Color Graphics Mode Screen640 x 200 16-Color Graphics Mode Screen 640 x 350 16-Color Graphics Mode ScreenColor Palettes Test Solid Colors Test Page Jumpers Jumpers, Switches, and ConnectorsJumpers and Switches General Explanation SwitchesSystem Board Figure C-1. System Board Jumpers and SwitchesClear Cmos Clear Password Reserved Bios Recovery Table C-1. System-Board Jumper and Switch SettingsVideo Sleep System Board Labels Table C-2. System Board Connectors and SocketsFigure C-2. Microprocessor Module Jumpers Microprocessor ModuleTable C-3. Microprocessor Module Jumper Settings Scsi Backplane Board Table C-4. Scsi Backplane Board ConnectorsFigure C-4. Power-Supply Paralleling Board Power-Supply Paralleling BoardTable C-5. Power-Supply Paralleling Board Connectors Disabling a Forgotten PasswordDer Telekommunikation Abbreviations and AcronymsDram LIF Verband Deutscher Elektro Index Page Index Page Index Page Switches settings table, C-3 Page Index
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