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Technical Overview: Dell Dimension Lxxxc Systems Reference

Technical Overview: Dell™ Dimension™ Lxxxc Systems Reference

	Internal View		Power Supply
	Back-Panel Features		DC Power Cables
	System Board Connectors and Sockets		DC Power Connector Assignments
	System Board Configuration Jumper

Internal View

1	Bezel release
2	5.25-inch drive bay
3	3.5-inch drive bays
4	Hard-disk drive
5	Power supply
6	AC power connector
7	I/O panel
8	Security cable slot
9	Release latch and padlock ring

Back-Panel Features

1	Mouse connector
2	Network connector
3	Parallel port connector
4	MIDI/game port connector*
5	Keyboard connector
6	USB connectors (2)
7	Video connector
8	Serial port connector
9	Diagnostic code indicators (4)
10	Line-out jack*
11	Line-in jack*
12	Microphone jack*
	* Present only on systems with integrated audio and NIC.

System Board Connectors and Sockets

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1	Microprocessor connector (J5H1)	16	CD-ROM drive audio cable connector (for systems with integrated audio; black color) (CD ROM)
2	DIMM sockets (BANKn)	17	MIDI/game port connector (for systems with integrate audio) (GAME)
3	Fan connector (J3J1)	18	Microphone jack (for systems with integrated audio) (MIC)
4	3.3-V power connector (OPTIONAL POWER)	19	Line-out jack (for systems with integrated audio) (LINE OUT)
5	Secondary IDE channel connector (SEC IDE)	20	Line-in jack (for systems with integrated audio) (LINE IN)
6	Control panel connector (J9F2)	21	Serial port connector (COM1)
7	Diskette drive interface connector (FLOPPY)	22	Parallel port connector; sometimes referred to as LPT1 (PARALLEL)
8	Primary EIDE channel connector (PRI IDE)	23	Video connector (VIDEO)
9	Power input connector (POWER)	24	USB connectors (USBn)
10	Battery socket (BATTERY)	25	Network connector (NIC)
11	Wakeup on LAN connector (WOL)	26	Mouse connector (MOUSE)
12	Speaker (LS9A1)	27	Keyboard connector (KEYBD)
13	Configuration jumper (J7A1)	28	Auxiliary line-in audio connector (for systems with integrated audio; natural color) (AUX IN)
14	Power indicator	29	Modem audio cable connector (for using integrated-audio system as a speaker phone; green color) (TELEPHONY)
15	PCI expansion-card connectors (natural color) (PCIn)

System Board Configuration Jumper

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 Lxxxc Systems Reference and Troubleshooting Guide.

Power Supply

The 145-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 to measure these voltages.

DC Voltage Ranges

Voltage	Range	Maximum Output Current	Notes
+3.3 VDC	+3.14 to +3.47 VDC	10.00 A	The combined load on the +3.3-VDC and +5-VDC outputs cannot exceed 85 W.
+5 VDC	+4.90 to +5.25 VDC	16.00 A	The combined load on the +3.3-VDC and +5-VDC outputs cannot exceed 85 W.
–5 VDC	–4.50 to –5.50 VDC	0.300 A
+12 VDC	+11.40 to +12.60 VDC	4.5 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

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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. The following figures show the wire side of the connectors.

DC Power Connector P1

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1	+5 VDC (red)	11	PSON#² (brown)
2	Common (black)	12	Common (black)
3	+5 VDC (red)	13	Common (black)
4	Common (black)	14	Common (black)
5	PWRGOOD¹ (orange)	15	–5 VDC (white)
6	+5 VFP (purple)	16	+5 VDC (red)
7	+12 VDC (yellow)	17	+5 VDC (red)
8	-12 VDC (blue)	18	+5 VDC (red)
9	Common (black)	19	Not connected
10	Common (black)	20	+5 VDC (red)

¹Pin 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.

²Pin 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.

DC Power Connector P4, P5, and P6

1	+12 VDC (yellow)
2	Common (black)
3	Common (black)
4	+5 VDC (red)

DC Power Connector P3

1	+12 VDC (yellow)
2	Common (black)
3	Common (black)
4	+5 VDC (red)

DC Power Connector P2

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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