System Board; Main Memory; Figure 1-11. System Board Components - Dell Precision 400 Service Manual

microphone jack
line-out jack
line-in jack
riser board
connector
(RISER)
CD-ROM drive
audio interface
connector (CD-IN)
secondary
SEC cartridge
(SLOT1_SEC)
configuration
jumpers
1-14 Dell WorkStation 400 Systems Service Manual

System Board

The subsections that follow provide service-related information about the sys-
tem board and components. The same system board is used in the midsize and
mini tower computers.
USB connectors (2) serial port 2
connector
NIC connector
secondary EIDE
primary EIDE interface
interface connector
connector (IDE1)
(IDE2) (pin-1 corner)
(pin-1 corner)

Figure 1-11. System Board Components

Main Memory

The four DIMM sockets on the system board can accommodate combinations
of 16-, 32-, 64-, and 128-MB DIMMs up to a total memory capacity of 512 MB.
The computer is shipped with high-speed (60-ns) EDO DIMMs that provide
ECC functionality when used with the Intel 82440FX PCIset. EDO ECC
DIMMs can be mixed, as follows:
•
There is no requirement that one socket be filled before the other, and empty
sockets can be left between installed DIMMs. Dell recommends populating
the sockets in order from A to D.
•
DIMM sockets do not have to contain DIMMs of the same size. DIMMs
may be installed in any order.
See "DIMMs" in Chapter 4 or Chapter 5 for information on removing and
replacing DIMMs.
mouse/keyboard
connectors
(stacked)
front of computer
diskette/tape drive
interface connector
(DSKT) (pin-1 corner)
control panel
connector (PANEL)
parallel/serial port 1
connectors (stacked)
processor fan
connector (FAN)
battery socket
(BATTERY)
DIMM sockets (4)
main power input
connector (POWER1)
primary SEC
cartridge
(SLOT1_PRI)
3.3-V power input
connector
(POWER2)