Dell 650 service manual Scsi Device Installation Guidelines

Page 48

1power cable

2power input connector

1interface connector

2colored stripe on cable

3interface cable

Most interface connectors are keyed for correct insertion; that is, a notch or a missing pin on one connector matches a tab or a filled-in hole on the other connector. Keyed connectors ensure that the pin-1 wire in the cable (indicated by the colored stripe along one edge of the cable) goes to the pin-1 end of the connector. The pin-1 end of a connector on a board or a card is usually indicated by a silk-screened "1" printed directly on the board or card.

NOTICE: When you connect an interface cable, do not place the colored stripe away from pin 1 of the connector. Reversing the cable prevents the drive from operating and could damage the controller, the drive, or both.

SCSI Device Installation Guidelines

This section describes how to configure and install SCSI devices in your computer. To install a SCSI device, you can use one or both of the following SCSI controllers:

•The SCSI connector on the system board. To locate the SCSI system board connector, see the system board illustration, see "System Board Components" ) or the interior service label.

NOTE: The system board SCSI controller supports hard drives only. Do not connect CD or DVD drives, tape drives, DAT drives, and so on.

•A SCSI controller card installed in your computer.

SCSI ID Numbers

Internal SCSI devices must have a unique SCSI ID number from 0 to 15. If you are using the SCSI connector on the system board and a SCSI controller card installed in your computer, you have two separate SCSI buses operating. Each SCSI bus has a set of SCSI ID numbers from 0 to 15.

When SCSI devices are shipped from the factory, the default SCSI ID numbers are assigned as follows:

 

System Board Controller

 

Controller Card

 

 

 

 

 

 

Device

 

ID

Device

 

ID

Controller

 

7

Controller

 

7

 

 

 

 

 

 

Boot hard drive

 

0

Boot hard drive

 

0

 

 

 

 

 

 

 

 

 

CD or DVD drive

 

5

 

 

 

 

 

 

 

 

 

tape or DAT drive

 

6

 

 

 

 

 

 

NOTE: There is no requirement that SCSI ID numbers be assigned sequentially or that devices be attached to the cable in order by ID number. If two or more devices use the same ID, your computer may hang during POST and in SCSI BIOS.

SCSI devices installed by Dell are configured correctly during the manufacturing process. You do not need to set the SCSI ID for these SCSI devices.

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Contents VRM Battery Page Precautionary Measures Before You BeginRecommended Tools Protecting Against Electrostatic DischargeBack to Contents Installing a Card CardsPage Removing a Card Back to Contents Chassis Intrusion Switch Removing the Chassis Intrusion SwitchReplacing the Chassis Intrusion Switch Control Panel Control Panel ComponentsRemoving the Control Panel Replacing the Control Panel Inside Your Computer Dell Precision 450 Computer Inside View of Your ComputerSystem Board Components DIMM4 Connecting Drive Cables Drives Dell Precision 450 ComputerOverview IDE Drive AddressingScsi Device Installation Guidelines Scsi ID NumbersDevice Termination Hard Drive General GuidelinesScsi Cables Removing a Hard DriveInstalling a Hard Drive Close the computer cover Floppy Drive Removing a Floppy DriveInstalling a Floppy Drive CD/DVD Drive Removing a CD/DVD DriveInstalling a CD/DVD Drive Close the computer cover Back to Contents Power Supply Dell Precision 450 Computer Removing the Power SupplyReplacing the Power Supply Drive Door Dell Precision 650 Computer Removing the Drive DoorReplacing the Drive Door Installing the Microprocessor Airflow Shroud Microprocessor Airflow Shroud Dell Precision 450 ComputerRemoving the Microprocessor Airflow Shroud Card Fan and Guide Dell Precision 650 Computer Removing the Card Fan and GuideReplacing the Card Fan and Guide Card Fan GuideBack to Contents Front Panel Removing the Front PanelReplacing the Front Panel Page Panel Panel Components for the Dell Precision 650 ComputerPanel Components for the Dell Precision 450 Computer Removing the I/O Panel Replacing the I/O PanelPage Inside Your Computer Dell Precision 650 Computer Auxled Closing the Computer Cover Back to Contents Opening the Computer Cover Security cable slot Cover release latch Padlock ring Installation Guidelines Installing the MicroprocessorMicroprocessor Removing the Microprocessor Close the computer cover Drives Dell Precision 650 Computer Scsi Device Installation Guidelines Hard Drive Installing a Hard Drive Page Floppy Drive Installing a Floppy Drive Page CD/DVD Drive Installing a CD/DVD Drive Page Close the computer cover Installing a VRM Removing a VRMBack to Contents Memory Installation Guidelines Addressing Memory With 4-GB ConfigurationsMemory Removing a Memory ModuleAdding a Memory Module Back to Contents Microprocessor Airflow Shroud Dell Precision 650 Computer Power Supply Dell Precision 650 Computer Replace the card fan Install the cards System Board Removing the System BoardReplacing the System Board Back to Contents
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