Dell 4100/180, 4100/200 Removing the Front Bezel, Inside the Chassis, Remove the computer covers

Removing the Front Bezel

Use the following procedure to remove the front bezel:

1.Remove the computer covers.

See the previous subsection, “Removing the Com- puter Covers.”

2.Release the two tabs on each side of the bezel.

3.Slide the front bezel straight forward.

tabs (4)

Figure 7-3. Removing the Front Bezel

Inside the Chassis

In Figures 7-4 and 7-5, the computer cover is removed to provide interior views from the left and right sides. These illustrations also identify features on the front and back of the computer. Refer to them to locate interior features and components discussed later in this guide.

When you look inside the computer, note the direct current (DC) power cables leading from the power supply or optional power-supply paralleling board. These cables supply power to the system board, small computer sys- tem interface (SCSI) backplane board, externally accessible drives, and certain expansion cards that con- nect to external peripherals.

The flat ribbon cables are the interface cables for internal drives. For non-SCSI drives, an interface cable connects each drive to an interface connector on the system board or on an expansion card. For SCSI devices, two interface cables connect externally accessible SCSI devices and the SCSI backplane board to a SCSI host adapter either on the system board or on an expansion card.

The system board—the large, vertical printed circuit board at the left side of the chassis near the back—holds the computer’s control circuitry and other electronic compo- nents. Some hardware options are installed directly onto the system board. The system board provides eight expan- sion-card connectors. The external drive bays provide space for up to four half-height drives, typically diskette drives, CD-ROM drives, or tape drives. The internal drive bays provide space for up to six half-height SCSI hard-disk drives. These drives are connected to the SCSI host adapter via the SCSI backplane board, which manages the drive bays and monitors the drive environment, including voltages and temperatures.

During an installation or troubleshooting procedure, you may be required to change a jumper or switch setting on the system board, an expansion card, or a drive. For informa- tion on the system board jumpers, see Appendix C, “Jumpers and Switches.”

7-4 Dell PowerEdge 4100/180 and 4100/200 Systems Installation and Troubleshooting Guide