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Technical Overview: Dell Dimension XPS Txxx and Txxxr Systems Reference
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Technical Overview: Dell™ Dimension™
XPS Txxx and Txxxr Systems Reference
Internal View of Desktop
• Internal View of Mini Tower • Back-Panel Features • System Board Connectors and Sockets •
System Board Configuration Jumper • SECC2 Package • Power Supply • DC Power Cables • DC Power Connector Pin Assignments
| 1 |
Power supply |
| 2 |
DC power cables |
| 3 |
Diskette-drive interface cable |
| 4 |
Secondary hard-disk drive bracket |
| 5 |
Drive cage |
| 6 |
Drive bays (typical) |
| 7 |
Power indicator |
| 8 |
Power button |
| 9 |
Hard-disk drive access indicator |
| 10 |
Reset button |
| 11 |
Bezel |
| 12 |
Card-guide assembly (contains primary
hard-disk drive) |
| 13 |
Chassis |
| 14 |
Filler brackets |
| 15 |
System board |
| 16 |
Chassis cooling fan |
| 17 |
Support beam |
| 1 |
Power supply |
| 2 |
DC power cables |
| 3 |
Diskette-drive interface cable |
| 4 |
Secondary hard-disk drive bracket |
| 5 |
Drive cage |
| 6 |
Drive bays (typical) |
| 7 |
Power indicator |
| 8 |
Power button |
| 9 |
Hard-disk drive access indicator |
| 10 |
Reset button |
| 11 |
Bezel |
| 12 |
Card-guide assembly (contains primary
hard-disk drive) |
| 13 |
Chassis |
| 14 |
Filler brackets |
| 15 |
System board |
| 16 |
Chassis cooling fan |
| 17 |
Support beam (on some models) |
Back-Panel Features
| 1 |
Voltage selection switch |
| 2 |
Security cable ring |
| 3 |
Parallel port connector |
| 4 |
MIDI/game port connector* |
| 5 |
Video connector |
| 6 |
Microphone jack* |
| 7 |
Line-in jack* |
| 8 |
Line-out jack* |
| 9 |
Diagnostic code indicators (4) |
| 10 |
Serial port connector |
| 11 |
USB connectors (2) |
| 12 |
Keyboard connector |
| 13 |
Mouse connector |
| 14 |
AC power receptacle |
|
* Present only on systems with integrated sound. |
System Board
Connectors and Sockets
| 1 |
Chassis cooling-fan connector (J7M1) |
| 2 |
Power input connector (POWER) |
| 3 |
3.3-V power input connector (3.3) |
| 4 |
Diskette-drive interface connector
(FLOPPY) |
| 5 |
SCSI hard-disk drive access-indicator
cable connector (J8J1) |
| 6 |
Control panel connector (J8H1) |
| 7 |
Primary EIDE channel connector
(PRI IDE) |
| 8 |
Secondary EIDE channel connector (SEC IDE) |
| 9 |
DIMM sockets (BANK n) |
| 10 |
AGP connector (brown color) (AGP) |
| 11 |
Battery socket (BT7C1) |
| 12 |
Configuration
jumper (J8A1) |
| 13 |
Speaker (LS8A1) |
| 14 |
ISA expansion-card connector (black color)
(ISA1*) |
| 15 |
PCI expansion-card connectors (natural
color) (PCIn*) |
| 16 |
Auxiliary line-in audio-connector (for
systems with integrated audio; natural color) (AUX IN) |
| 17 |
Wakeup On LAN connector (J1E1) |
| 18 |
Modem audio cable connector (for using
integrated-audio system as a speaker phone; green color) (TELEPH) |
| 19 |
CD-ROM drive audio cable connector (for
systems with integrated audio; black color) (CD IN) |
| 20 |
MIDI/game port connector (for systems with
integrated audio) (GAME) |
| 21 |
Line-in jack, line-out jack, and
microphone jack (for systems with integrated audio) (LINE IN, LINE OUT, and MIC IN) |
| 22 |
Diagnostic code indicators (4) |
| 23 |
Parallel port connector; sometimes
referred to as LPT1 (PARALLEL) |
| 24 |
Serial port connector (COM1) |
| 25 |
USB connectors (USBn) |
| 26 |
Mouse connector (MOUSE) |
| 27 |
Keyboard connector (KEYBD) |
| 28 |
Microprocessor SECC2 package connector
(J4J1) |
| 29 |
Microprocessor fan connector (J4M1) |
| 30 |
Flea power indicator |
|
* Connectors ISA1 and PCI5 share a single card-slot opening, so
only one of the two connectors can be used at any given time. |
System Board Configuration
Jumper
Table 1. Configuration Jumper Settings
 |
NOTE: The red dot in the jumper denotes pin 1.
|
| Jumper Setting |
Jumper |
Description |
Pins 1-2 jumpered
(Normal mode) |
 |
In Normal mode, system setup settings and
installed passwords are retained when the system starts up. In this mode, an automatic
recovery is attempted if the BIOS detects that any of its main blocks are corrupted. |
Pins 2-3 jumpered
(Maintenance mode) |
 |
Starting the system with the jumper set in Maintenance
mode automatically starts the system setup program, adds the Maintenance option to
the menu bar, and displays the Maintenance screen. This screen provides the
following option. NOTICE: Entering Maintenance mode
returns all settings in the system setup program to their defaults. Dell strongly
recommends that you record or print all current settings before entering this mode so you
can correct them when the system is reset to Normal mode.
- Clear All Passwords — Disables a forgotten
password so that you can access the system and/or assign new passwords. For the complete
password procedure, see "Disabling a Forgotten Password" in Appendix B of the Dell
Dimension XPS Txxx and Txxxr Systems Reference and Troubleshooting Guide.
|
SECC2 Package
The single-edge contact cartridge 2 (SECC2) package, shown above
with the heat sink attached, contains a 242-pin microprocessor card. The microprocessor
card includes the following features:
- Intel� Pentium� III microprocessor with
integrated 32-kilobyte (KB) primary (L1) cache
- Secondary (L2) cache of 256 KB full-speed or 512 KB half-speed of
burst synchronous random-access memory (SRAM)
- Associated circuitry
The heat sink attaches to a thermal plate on the SECC2 package. The
cartridge slides into a guide bracket assembly mounted on the system board and plugs into
the J4J1 connector on the system board.
Power Supply
The 200-Watt (W) power supply can operate from an AC power source of
115 volts AC (VAC) at 60 hertz (Hz) or 230 VAC at 50 Hz. The power supply provides the DC
operating voltages and currents listed in the following table.
|
NOTE: The power supply produces DC voltages only under its
loaded condition. The DC power cable connectors must be connected to their corresponding
power input connectors on the system board or drives in order to measure these voltages. |
Table 2. DC Voltage Ranges
| Voltage |
Range |
Maximum Output Current |
Notes |
| +3.3 VDC |
+3.14 to +3.47 VDC |
14.00 A |
The combined load on the +3.3-VDC and +5-VDC outputs
cannot exceed 140 W. |
| +5 VDC |
+4.90 to +5.25 VDC |
22.00 A |
The combined load on the +3.3-VDC and +5-VDC outputs
cannot exceed 140 W. |
| –5 VDC |
–4.50 to –5.50 VDC |
0.300 A |
|
| +12 VDC |
+11.40 to +12.60 VDC |
6.00 A |
The +12-VDC output can withstand surges of up to 11.0
A to support disk start-up operations. |
| –12 VDC |
–10.80 to –13.20 VDC |
0.300 A |
|
| +5 VSB |
+4.75 to +5.25 VDC |
1.2 A |
The +5 volts standby (VSB) is sometimes called volts
flea power (VFP). |
DC Power Cables
DC Power Connector
Pin Assignments
The power-supply output voltages can be measured at the back (wire
side) of the DC power connectors without disconnecting them. Figures 1 through 4 show the
wire side of the connectors.
Figure 1. DC Power Connector P1
| 1 |
+5 VDC (red) |
| 2 |
Common (black) |
| 3 |
+5 VDC (red) |
| 4 |
Common (black) |
| 5 |
PWRGOOD1 (orange) |
| 6 |
+5 VFP (purple) |
| 7 |
+12 VDC (yellow) |
| 8 |
–12 VDC (blue) |
| 9 |
Common (black) |
| 10 |
Common (black) |
| 11 |
PSON#2 (brown) |
| 12 |
Common (black) |
| 13 |
Common (black) |
| 14 |
Common (black) |
| 15 |
–5 VDC (white) |
| 16 |
+5 VDC (red) |
| 17 |
+5 VDC (red) |
| 18 |
+5 VDC (red) |
| 19 |
Not connected |
| 20 |
+5 VDC (red) |
1 Pin
5 — PWRGOOD is a status signal generated by the power supply to notify the system
that the DC operating voltages are within the ranges required for proper system operation.
2 Pin 11 — PSON# is activated by pressing and
releasing the power button while the power supply is in standby state. Activating PSON#
connects the power supply’s PSON# input to ground, thereby switching the power supply
to full-on condition. |
Figure 2. DC Power Connector P2, P3, P5, and P6
| 1 |
+12 VDC (yellow) |
| 2 |
Common (black) |
| 3 |
Common (black) |
| 4 |
+5 VDC (red) |
Figure 3. DC Power Connector P4
| 1 |
+12 VDC (yellow) |
| 2 |
Common (black) |
| 3 |
Common (black) |
| 4 |
+5 VDC (red) |
Figure 4. DC Power Connector P7
| 1 |
Common (black) |
| 2 |
Common (black) |
| 3 |
Common (black) |
| 4 |
+3.3 VDC (orange) |
| 5 |
+3.3 VDC (orange) |
| 6 |
+3.3 VDC (orange) |
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