Checking Inside the Computer
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In Figure 7-4, the panel doors on the top of the computer are open to provide an inte-
rior view of the system. Figure 7-4 also shows an exploded view of the fan assembly
and the cover panel that provides access to the SCSI backplane board. Refer to this
illustration to locate interior features and components discussed later in this guide.
The
system board—the large printed circuit board at the bottom of the chassis—holds
the computer’s control circuitry and other electronic components. Additional hard-
ware components, such as expansion cards and the memory module, are installed
directly on the system board.
During an installation or troubleshooting procedure, you may be required to change a
jumper or switch setting. For information on the system board jumpers, see
Appendix B, “Jumpers, Switches, and Connectors.”
The wide ribbon cables inside the chassis (not shown in Figure 7-4) are the
interface
cables for the drive devices. For non-SCSI drives such as the diskette drive, an inter-
face cable connects the drive to an interface connector on the system board or on an
expansion card. For SCSI devices, interface cables connect the SCSI CD-ROM drive
and the SCSI backplane board to SCSI host adapters either on the system board or on
an expansion card. (For more information, see Chapter 9, “Installing the Diskette and
CD-ROM Drives,” and Chapter 10, “Installing Hard-Disk Drives.”)
NOTE: If you should ever disconnect any or all of the interface cables from the system
board, be sure to note the order in which you remove them so that you can reinstall
them in the correct order. Refer to “Routing the Interface Cables Inside the Chassis”
in Chapter 8 for more information about installing the interface cables.
Toward the front of the chassis interior, beneath the power supplies, is the power-
supply paralleling board. Attached to the power-supply paralleling board are
DC power
cables, which supply power to the system board, SCSI backplane board, the diskette
drive, and the CD-ROM drive.
Beneath the cover panel toward the front of the chassis are the SCSI backplane board
and the drive bays. The
diskette drive bay is a vertical bay to the left of the hard-disk
drives that holds a 3.5-inch diskette drive installed on a slide bracket and connected to
an interposer card located behind the drive. The interposer card provides a stable con-
nection for the diskette interface cable and power cable. The
hard-disk drive bays
provide space for up to three 1-inch SCSI hard-disk drives. These hard-disk drives are
connected to a SCSI host adapter on the system board or on an expansion card via
the
SCSI backplane board. An additional 5.25-inch drive bay is provided for a SCSI CD-ROM
drive, which is connected to the Ultra/Narrow SCSI host adapter integrated on the system
board.
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