Dell T7500 User Manual

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Dell Precision™ T7500 Service Manual

Working on Your Computer

Adding and Replacing Parts

Specifications

Diagnostics

About Memory

About Your System Board

System Setup

Notes, Cautions, and Warnings

NOTE: A NOTE indicates important information that helps you make better use of your computer.

CAUTION: A CAUTION indicates potential damage to hardware or loss of data if instructions are not followed.

WARNING: A WARNING indicates a potential for property damage, personal injury, or death.

If you purchased a Dell™ n Series computer, any references in this document to Microsoft® Windows® operating systems are not applicable.

Reproduction of this material in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.

Trademarks used in this text: Dell, the DELL logo, and Dell Precision are trademarks of Dell Inc.; Intel and Xeon are registered trademarks of Intel Corporation; Bluetooth is a registered trademark owned by Bluetooth SIG, Inc. and is used by Dell under license; Blu-ray Disc is a trademark of the Blu-ray Disc Association; Microsoft, Windows, Windows Server, MS-DOS, Aero, Windows Vista. and the Windows Vista start button are either trademarks or registered trademarks of Microsoft Corporation in the United States and/or other countries.

Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Inc. disclaims any proprietary interest in trademarks and trade names other than its own.

Model DCDO

February 2010

Rev. A01

Working on Your Computer

Dell Precision™ T7500 Service Manual

Before Working Inside Your Computer

Recommended Tools

Turning Off Your Computer

After Working Inside Your Computer

Before Working Inside Your Computer

Use the following safety guidelines to help protect your computer from potential damage and to help to ensure your personal safety. Unless otherwise noted, each procedure included in this document assumes that the following conditions exist:

You have performed the steps in Working on Your Computer.

You have read the safety information that shipped with your computer.

A component can be replaced or—if purchased separately—installed by performing the removal procedure in reverse order.

WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance.

CAUTION: Only a certified service technician should perform repairs on your computer. Damage due to servicing that is not authorized by Dell is not covered by your warranty.

CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface, such as a connector on the back of the computer.

CAUTION: Handle components and cards with care. Do not touch the components or contacts on a card. Hold a card by its edges or by its metal mounting bracket. Hold a component such as a processor by its edges, not by its pins.

CAUTION: When you disconnect a cable, pull on its connector or on its pull-tab, not on the cable itself. Some cables have connectors with locking tabs; if you are disconnecting this type of cable, press in on the locking tabs before you disconnect the cable. As you pull connectors apart, keep them evenly aligned to avoid bending any connector pins. Also, before you connect a cable, ensure that both connectors are correctly oriented and aligned.

NOTE: The color of your computer and certain components may appear differently than shown in this document.

To avoid damaging your computer, perform the following steps before you begin working inside the computer.

1.Ensure that your work surface is flat and clean to prevent the computer cover from being scratched.

2.Turn off your computer (see Turning Off Your Computer).

CAUTION: To disconnect a network cable, first unplug the cable from your computer and then unplug the cable from the network device.

3. Disconnect all network cables from the computer.

5.Disconnect your computer and all attached devices from their electrical outlets.

6.Press and hold the power button while the system is unplugged to ground the system board.

7.Remove the computer cover (see Removing and Replacing the Computer Cover).

CAUTION: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the computer. While you work, periodically touch an unpainted metal surface to dissipate static electricity, which could harm internal components.

Recommended Tools

The procedures in this document may require the following tools:

Small flat-blade screwdriver

Phillips screwdriver

Small plastic scribe

Flash BIOS update program CD (see the Dell Support website at support.dell.com)

Turning Off Your Computer

CAUTION: To avoid losing data, save and close all open files and exit all open programs before you turn off your computer.

1. Shut down the operating system:

In Windows Vista:

Click Start , then click the arrow in the lower-right corner of the Start menu as shown below, and then click Shut Down.

In Windows XP:

Click Start→ Turn Off Computer→ Turn Off.

The computer turns off after the operating system shutdown process is complete.

2.Ensure that the computer and all attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut down your operating system, press and hold the power button for about 6 seconds to turn them off.

After Working Inside Your Computer

After you complete any replacement procedure, ensure you connect any external devices, cards, and cables before turning on your computer.

1.Replace the computer cover (see Removing and Replacing the Cover).

2.Connect any telephone or network cables to your computer.

CAUTION: To connect a network cable, first plug the cable into the network device and then plug it into the computer.

3.Connect your computer and all attached devices to their electrical outlets.

4.Turn on your computer.

5.Verify that the computer works correctly by running the Dell Diagnostics. See Dell Diagnostics.

Adding and Replacing Parts

Dell Precision™ T7500 Service Manual

Cover	Chassis Intrusion Switch
Battery	Drives Bezel
Hard Drive	Hard-drive Fan
Hard-drive Cage	Optical Drive
Front Fan Assembly	Rear Fan
Memory Shroud	Memory
Expansion Cards	Heat Sink and Processor
Processor Fan	Dual Processor Riser (Optional)
Dual Processor Riser Guide	I/O Panel
Power Supply	System Board

Specifications

Dell Precision™ T7500/T7500n Service Manual

Processors	Drives
System Information	Connectors
Memory	Controls and Lights
Video	Power
Audio	Physical
Expansion Bus	Environmental

NOTE: Offerings may vary by region. For more information regarding the configuration of

your Tablet-PC, click Start (or Start in Windows XP)® Help and Support, and then select the option to view information about your Tablet-PC.

Processor
Processor types	Dual-Core Intel® Xeon® Processor 5500
	series
	Quad-Core Intel® Xeon® Processor
	5500 series
System Information
System chipset	Intel 5500/5520
Data bus width	64 bits
Memory
Memory module connectors	Six
	Twelve with optional riser
Memory module capacities	1 GB, 2 GB, 4 GB, 8 GB and 16 GB
Memory type	DDR3 1066 MHz SDRAM
	DDR3 1333 MHz SDRAM
	(DDR3 800 MHz capable)
Minimum memory	1 GB
Maximum memory	96 GB
	192 GB with optional riser
Video
Video type:
Discrete	PCI Express 2.0 x16 (2 slots)
	NOTE: Support for two full height, full
	length graphics cards using the PCIe x16
	graphics card slot.
Audio
Audio type	Analog Devices ADI1984A

Expansion Bus
Bus type		PCI Express 2.0
Bus type		PCI Express 2.0
		PCI 2.3
		PCI-X 2.0A
		SATA 1.0 and 2.0
		eSATA 2.0
		SAS
		USB 2.0

Bus speed

Two PCI Express 2.0 x16 slots (video)

Connector pins

Connector data width (maximum)

Two PCI Express 2.0 x8 slots (physical x16 connector)

Connector pins

Connector data width (maximum)

One PCI Express 2.0 x4 slot (physical x16)

Connector pins

Connector data width (maximum)

One PCI Slot

Connector pins

Connector data width (maximum) One PCI-X Slot

133 MB/s (PCI)

x1-slot bidirectional speed - 500 MB/s (PCI Express)

x16-slot bidirectional speed - 8 GB/s (PCI Express)

1.5 Gbps and 3.0 Gbps (SATA)

480-Mbps high speed, 12-Mbps full speed, 1.2 Mbps

low speed (USB)

164 pins

16 PCI Express lanes (each direction)

164 pins

8 PCI Express lanes (each direction)

164 pins

4 PCI Express lanes (each direction)

120 pins 32 bits

Connector pins	188 pins
Connector data width (maximum)	64 bits
Drives
Externally accessible	Four 5.25 inch drive bays (can support
	3.5 inch flex bay)
Internally accessible	Four 3.5 inch drive bays
Available devices	Up to three of the following 5.25 inch
	devices: SATA DVD ROM, SATA DVD+/-
	RW super multi drive/Blu-ray™ drive
	One 3.5-inch USB media card reader or
	one 3.5 inch Floppy Disk Drive
	Up to five 3.5-inch SATA or four SAS
	hard drives
Connectors
External connectors:
Video	(Depending on video card)
	DVI connector
	Display port

Network adapter	RJ-45 connector
USB	USB 2.0 compliant
	Two internal connectors
	Two in the front
	Six in the back
Serial	One 9-pin connector; 16550C-
	compatible
Parallel	One 25-pin connector
eSATA	One 7-pin eSATA connector
Audio	Stereo support integrated (5.1 channel
	support)
	NOTE: 5.1 channel support comes from
	an add-in card only
PS/2	Two 6-pin mini-DIN connectors
System board connectors:
Serial ATA	Three 7-pin SATA connectors
SAS	Four 7-pin SAS connectors
Internal USB device	Two 10-pin connector (supports two
	USB ports)
Fans:
Hard Disk Drive fan	One 5-pin connector
Front fan	One 7-pin connector
Rear fan	One 5-pin connector
Card cage fan	One 7-pin connector
PCI	One 120-pins connector
PCI-X	One 188-pins connector
PCI Express x16	Two 164-pin connectors
PCI Express x8	Two 164-pin connectors (physical x16
	connector)
PCI Express x4	One 164-pin connector
Front panel control	One 10-pin connector
Front panel USB	One 10-pin connector
Front panel audio HDA header	One 10-pin connector
Processor	One connector
	Second connector on optional riser
Memory	Six 240-pin connectors
	Six 240-pin connectors on optional riser
Processor Power	One 4-pin connector
	Second 4-pin connector on optional riser
Power	One 24-pin connector
Controls and Lights
Front of the computer
Power button	Push button
Power light	Amber light — Solid amber indicates a
	problem with an installed device;
	blinking amber indicates an internal
	power problem
	Green light — Blinking green in sleep

Drive activity light

Network link light

Back of the computer

Link integrity light (on integrated network adapter)

Network activity light (on integrated network adapter)

Power

DC power supply:

Wattage

Voltage

Coin-cell battery

Physical

Height

Width

Depth

Weight

Environmental

Temperature range:

Operating

Storage

Relative humidity (maximum): Maximum vibration

Operating

Storage

Maximum shock

Operating

Storage

Altitude (maximum):

state; solid green for power-on state

Green light — A blinking green light indicates the computer is reading data from or writing data to the hard drive or CD/DVD

Green light — Solid green indicates connection to an active network

Off (no light) — System is not connected to a network

Off — The computer is not detecting a physical connection to the network Green — A good connection at 10Mbs exists between the network and the computer

Orange — A good connection at 100Mbs exists between the network and the computer

Yellow — A good connection at 1000Mbs exists between the network and the computer

Yellow blinking light

1100 W

100–240 VAC, 50–60 Hz, 12.0 A 3V CR2032 lithium coin cell

56.50 cm (22.25 inches)

21.60 cm (8.50 inches)

55.30 cm (21.80 inches) at least 24.90 kg (55 lbs)

10° to 35°C (50° to 95°F) -40° to 65°C (-40° to 149°F) 20% to 80% (noncondensing)

5 to 350 Hz at 0.0002 G²/Hz 5 to 350 Hz at 0.0002 G²/Hz

40 G +/- 5% with pulse duration of 2 msec +/- 10% (equivalent to 51 cm/sec [20 in/sec])

105 G +/- 5% with pulse duration of 2 msec +/- 10% (equivalent to 127 cm/sec [50 in/sec])

Operating	-15.2 to 3048 m (-50 to 10,000 ft)
Storage	-15.2 to 10,668 m (-50 to 35,000 ft)
Airborne contaminant level	G2 or lower as defined by ISA-S71.04-
	1985

Diagnostics

Dell Precision™ T7500 Service Manual

Dell Diagnostics

Power Button Light Codes

Diagnostic Light Codes

Pre-POST Diagnostic Light Patterns

POST Diagnostic Light Patterns

Beep Codes

Dell Diagnostics

When to Use the Dell Diagnostics

It is recommended that you print these procedures before you begin.

NOTE: The Dell Diagnostics software works only on Dell computers.

NOTE: The Drivers and Utilities disc is optional and may not ship with your computer.

Enter system setup (see Entering System Setup), review your computer's configuration information, and ensure that the device you want to test displays in System Setup and is active.

Start the Dell Diagnostics from either your hard drive or from the Drivers and Utilities disc.

Starting the Dell Diagnostics From Your Hard Drive

1.Turn on (or restart) your computer.

2.When the DELL logo appears, press <F12> immediately.

NOTE: If you see a message stating that no diagnostics utility partition has been found, run the Dell Diagnostics from your Drivers and Utilities disc.

If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop. Then shut down your computer (see Turning Off Your Computer), and try again.

3.When the boot device list appears, highlight Boot to Utility Partition and press <Enter>.

4.When the Dell Diagnostics Main Menu appears, select the test that you want to run.

Starting the Dell Diagnostics From the Drivers and Utilities Disc

1.Insert the Drivers and Utilities disc.

2.Shut down and restart the computer.

When the DELL logo appears, press <F12> immediately.

If you wait too long and the Windows logo appears, continue to wait until you see the Windows desktop. Then shut down your computer and try again.

NOTE: The next steps change the boot sequence for one time only. On the next startup, the computer boots according to the devices specified in the system setup program.

3.When the boot device list appears, highlight Onboard or USB CD-ROM Drive and press <Enter>.

4.Select the Boot from CD-ROM option from the menu that appears and press <Enter>.

5.Type 1 to start the menu and press <Enter> to proceed.

6.Select Run the 32 Bit Dell Diagnostics from the numbered list. If multiple versions are listed, select the version appropriate for your computer.

7.When the Dell Diagnostics Main Menu appears, select the test you want to run.

Dell Diagnostics Main Menu

1. After the Dell Diagnostics loads and the Main Menu screen appears, click the button for the option you want.

Option	Function
Express	Performs a quick test of devices. This test typically takes 10 to 20 minutes and requires no interaction on
Test	your part. Run Express Test first to increase the possibility of tracing the problem quickly.
Extended	Performs a thorough check of devices. This test typically takes 1 hour or more and requires you to answer
Test	questions periodically.
Custom	Tests a specific device. You can customize the tests you want to run.
Test
Symptom	Lists the most common symptoms encountered and allows you to select a test based on the symptom of the
Tree	problem you are having.

2.If a problem is encountered during a test, a message appears with an error code and a description of the problem. Write down the error code and problem description and follow the instructions on the screen.

3.If you run a test from the Custom Test or Symptom Tree option, click the applicable tab described in the following table for more information.

Tab	Function
Results	Displays the results of the test and any error conditions encountered.
Errors	Displays error conditions encountered, error codes, and the problem description.
Help	Describes the test and may indicate requirements for running the test.

Configuration Displays your hardware configuration for the selected device.

The Dell Diagnostics obtains configuration information for all devices from system setup, memory, and various internal tests, and it displays the information in the device list in the left pane of the screen. The device list may not display the names of all the components installed on your computer or all devices attached to your computer.

Parameters

Allows you to customize the test by changing the test settings.

4.When the tests are completed, if you are running the Dell Diagnostics from the Drivers and Utilities disc, remove the disc.

5.Close the test screen to return to the Main Menu screen. To exit the Dell Diagnostics and restart the computer, close the Main Menu screen.

Power Button Light Codes

The diagnostic lights give much more information about the system state, but legacy power light states are also supported in your computer. The power light states are shown in following table.

Power

Light

State

Off

Blinking

Amber

Solid

Amber

Description

Power is off, light is blank.

Initial state of light at power up.

Indicates system has power, but the POWER_GOOD signal is not yet active.

If the Hard Drive light is off, it is probable that the power supply needs to be replaced.

If the Hard Drive light on, it is probable that an onboard regulator or VRM has failed. Look at the diagnostic lights for further information.

Second state of the light at power up. Indicates the POWER_GOOD signal is active and it is probable that

	the power supply is fine. Look at the diagnostic lights for further information.
Blinking
Blinking
Green	System is in a low power state, either S1 or S3. Look at the diagnostic lights to determine which state the
	system is in.
Solid
Green	System is in S0 state, the normal power state of a functioning machine.
	The BIOS will turn the light to this state to indicate it has started fetching opcodes.

Diagnostic Light Codes

Four (4) single color lights are incorporated on the front control panel to serve as a diagnostic aid for troubleshooting systems exhibiting No Post/No Video symptoms. The lights do NOT report runtime errors.

Each light has two possible states of OFF or ON. The most significant bit is labeled with the number 1, and the other three are labeled 2, 3, and 4, as you go down or across the LED stack. The normal operating condition after POST is for all four lights to be ON and then turn off as the BIOS hands over control to the operating system.

Pre-POST Diagnostic Light Patterns

State

Pb0a

Pb0b

Pb0c

Pb1

Pb2

Pb3

Pb4

Pb5

Light Pattern	Light	Power	State
( 1 2 3 4 )	Description	Light	Assignment
	1- Off		System
	2- Off		System
	3- Off		Unplugged
	4- Off
	1- Off		ACPI S0;
	2- Off		ACPI S0;
	2- Off		Normal
	3- Off		Normal
	3- Off		Operation
	4- Off		Operation
	4- Off
	1- Off
	2- Off		ACPI S1
	3- Off		ACPI S1
	3- Off
	4- Off
	1- Off		ACPI S4 or
	2- Off		ACPI S4 or
	3- Off		S5
	4- Off
	1- Off
	2- Off	-	Reserved
	3- Solid	-	Reserved
	3- Solid
	4- Off
	1- Off
	2- Off		ACPI S3
	3- Solid		ACPI S3
	3- Solid
	4- Solid
	1- Off
	2- Green	-	Reserved
	3- Off	-	Reserved
	3- Off
	4- Off
	1- Off
	2- Green	-	Reserved
	3- Off	-	Reserved
	3- Off
	4- Green

State Description

System is not plugged into AC, PSU is not plugged into system board, or control panel not connected to system board.

System is on with no failures detected. This is actually a BIOS controlled state and is also S0e.

Windows Standby State.

Hibernate or Soft off. System plugged in, but either turned off or in Windows Hibernation State.

Reserved

Suspend to RAM Windows Standby State.

Reserved

Pb6

Pb7

Pb8

Pb9

Pb10

Pb11

Pb12

Pb13

Pb14

Pb15

1- Off

2- Green

3- Green

4- Off

1- Off

2- Blink

3- Blink

4- Blink

1- Green

2- Off

3- Off

4- Off

1- Blink

2- Off

3- Off

4- Blink

1- Blink

2- Off

3- Blink

4- Off

1- Blink

2- Off

3- Blink

4- Blink

1- Blink

2- Blink

3- Off

4- Off

1- Blink

2- Blink

3- Off

4- Blink

1- Green

2- Green

3- Green

4- Off

1- Green

2- Green

3- Green

4- Green

-Reserved Reserved

	ACPI S0,	System on. BIOS not execution. This is the transition
	hand off to
		state to POST states.
	BIOS control

-Reserved

Non-System board Regulator Failure

PSU Failure

PSU Cable

Failure

System board Regulator Failure

Mismatch

-Reserved

Reserved

A power failure has been detected on a plug-in component such as VRM, Video Riser, or Memory Riser.

PSU may be bad or PSU cable may be crimped creating a short on a main power rail. (PS_ON asserted, PS_PWRGOOD not asserted)

All PSU cables may not be properly connected to system board. (PS_ON asserted, missing a main power rail)

A power failure has been detected in one of the onboard system board regulators. This could be caused by a failed system board component or by a plug-in device creating a short on a regulated power rail. (PS_ON asserted, PS_PWRGOOD asserted, SYS_PWRGOOD de-asserted)

Hardware detected a population incompatibility with a critical system component such as CPU, VRM, PSU, or MEMORY RISER.

Reserved

POST Diagnostic Light Patterns

All POST codes except S0 are accompanied by a Solid Green Power light state. If the power light is not green, see PrePOST Diagnostic Light Patterns.

State	Light Pattern	Light	State	State	State Description
	( 1 2 3 4 )	Description Name Assignment

1- Off

S0a 2- Off OFF OFF Power light Off. No power is supplied to the system. 3- Off

4- Off

S0e

1- Off		Normal
2- Off		Normal
2- Off	ON	Operation,
3- Off	ON	Operation,
3- Off		ACPI S0
4- Off		ACPI S0
4- Off
1- Off		System is in
2- Off		System is in
2- Off	RCM	Recovery
3- Off	RCM	Recovery
3- Off		Mode
4- Solid		Mode
4- Solid
1- Off
2- Off

Power light Solid Green. System has successfully booted and is operating normally.

BIOS checksum failure was detected and the system is now in recovery mode.

CPU configuration activity is in progress or a CPU

S10

S11

S12

S13

S14

S15

3- Solid

4- Off

1- Off

2- Off

3- Solid

4- Solid

1- Off

2- Solid

3- Off

4- Off

1- Off

2- Solid

3- Off

4- Solid

1- Off

2- Solid

3- Solid

4- Off

1- Off

2- Solid

3- Solid

4- Solid

1- Solid

2- Off

3- Off

4- Off

1- Solid

2- Off

3- Off

4- Solid

1- Solid

2- Off

3- Solid

4- Off

1- Solid

2- Off

3- Solid

4- Solid

1- Solid

2- Solid

3- Off

4- Off

1- Solid

2- Solid

3- Off

4- Solid

1- Solid

2- Solid

3- Solid

4- Off

1- Solid

2- Solid

3- Solid

4- Solid

CPU

MEM

PCI

VID

STO

USB

MEM

MBF

MEM

PRV

CFG

POV

STD

CPU

Memory

PCI device

Video Card

Storage

USB

Memory

System board

Memory

Other prevideo activity

Resource configuration

Reserved

Other postvideo activity

Boot hand off

failure was detected.

Memory subsystem configuration activity is in progress. Appropriate memory modules were detected but a memory failure has occurred.

PCI device configuration activity is in progress or PCI device failure was detected.

Video subsystem configuration activity in progress or video subsystem failure.

Storage device configuration in progress or storage subsystem failure.

USB subsystem configuration activity in progress or USB subsystem failure.

Memory subsystem configuration activity is in progress. No memory modules were detected.

Fatal system board failure detected.

Memory subsystem configuration activity is in progress. Memory modules have been detected but appear to be incompatible or in an invalid configuration.

Indicates routine system activity preceding video initialization.

System resource configuration in progress.

Reserved for future use. This pattern is being considered to indicate the Visual Off state on the Dimension systems.

Indicates routine system activity subsequent to video initialization.

Indicates End of POST process. Lights are normally in this state briefly as POST completes. Once the hand-off to the OS is done, the lights turn off and transition to S0e state.

Beep Codes

When errors occur during a boot routine that cannot be reported on the monitor, the computer may emit a beep code that identifies the problem. The beep code is a pattern of sounds: for example, one beep followed by a second beep, then followed by a burst of three beeps (code 1-1-3) means that the computer was unable to read the data in nonvolatile random-access memory (NVRAM). If the system loses power and beeps constantly when you turn it back on, the BIOS is probably corrupted.

	System Beep Codes
Beep	Description	Beep	Description
Code		Code

1-1-2	CPU register test in progress	2-4-3 1st 64 K RAM chip or data line failure - bit E
1-1-3 CMOS read/write test in progress or failure		2-4-4 1st 64 K RAM chip or data line failure - bit F
1-1-4 BIOS ROM checksum in progress or failure		3-1-1 Slave DMA register test in progress or failure
1-2-1 Timer Test in progress or failure		3-1-2 Master DMA register test in progress or failure
1-2-2	DMA initialization in progress or failure	3-1-3	Master IMR test in progress or failure
1-2-3	DMA page register read/write test in progress	3-1-4	Slave IMR test in progress or failure
	or failure

1-3-1 RAM refresh verification in progress or failure		3-2-2 Interrupt vector loading in progress
1-3-2	1st 64 K RAM test in progress or failure	3-2-4	Keyboard controller test in progress or failure
1-3-3	1st 64 K RAM chip or data line failure (multi	3-3-1	CMOS power fail and checksum test in progress
	bit)

1-3-4 1st 64 K RAM odd/even logic failure		3-3-2 CMOS Config info validation in progress
1-4-1 1st 64 K RAM address line failure		3-3-3	RTC/Keyboard controller not found
1-4-2 1st 64 K RAM parity test in progress or failure		3-3-4 Screen memory test in progress or failure
1-4-3 Fail-safe timer test in progress		3-4-1 Screen initialization test in progress or failure
1-4-4	Software NMI port test in progress	3-4-2 Screen retrace tests test in progress or failure
2-1-1 1st 64 K RAM chip or data line failure - bit 0		3-4-3 Search for video ROM in progress
2-1-2 1st 64 K RAM chip or data line failure - bit 1		4-2-1 Timer tick interrupt test in progress or failure
2-1-3 1st 64 K RAM chip or data line failure - bit 2		4-2-2 Shutdown test in progress or failure
2-1-4 1st 64 K RAM chip or data line failure - bit 3		4-2-3	Gate A20 failure
2-2-1 1st 64 K RAM chip or data line failure - bit 4		4-2-4	Unexpected interrupt in Protected Mode
2-2-2 1st 64 K RAM chip or data line failure - bit 5		4-3-1	RAM test in progress or failure above address
			0FFFFh

2-2-3 1st 64 K RAM chip or data line failure - bit 6		4-3-2	No memory in Bank 0
2-2-4 1st 64 K RAM chip or data line failure - bit 7		4-3-3	Interval Timer Channel 2 test in progress or
			failure

2-3-1 1st 64 K RAM chip or data line failure - bit 8		4-3-4 Time-Of-Day Clock test in progress or failure
2-3-2 1st 64 K RAM chip or data line failure - bit 9		4-4-1	Super I/O chip failure
2-3-3 1st 64 K RAM chip or data line failure - bit A		4-4-4	Cache test failure
2-3-4 1st 64 K RAM chip or data line failure - bit B
2-4-1 1st 64 K RAM chip or data line failure - bit C
2-4-2 1st 64 K RAM chip or data line failure - bit D

About Memory

Dell Precision™ T7500 Service Manual

Memory Modules

Supported Memory Configurations

Memory Subsystem

Memory Slots

Memory Population Rules

Your computer uses 1066 MHz and 1333Mhz DDR3 unbuffered or registered ECC SDRAM memory. DDR3 SDRAM, or double-data- rate three synchronous dynamic random access memory, is a random access memory technology. It is a part of the SDRAM family of technologies, which is one of many DRAM (dynamic random access memory) implementations, and is an evolutionary improvement over its predecessor, DDR2 SDRAM.

The primary benefit of DDR3 SDRAM is its ability to run its I/O bus at four times the speed of the memory cells it contains, thus enabling faster bus speeds and higher peak throughputs than earlier technologies. This is achieved at the cost of higher latency. Also, the DDR3 standard allows for chip capacities of 512 megabit to 8 gigabit, effectively enabling memory modules of maximum 16 gigabyte in size.

DDR3 memory comes with a promise of a power consumption reduction of 30% compared to current commercial DDR2 modules due to DDR3’s 1.5 V supply voltage. This supply voltage works well with the 90 nm fabrication technology used for most DDR3 chips. Some manufacturers further propose to use "dual-gate" transistors to reduce leakage of current.

The main benefit of DDR3 comes from the higher bandwidth made possible by DDR3’s 8 bit deep prefetch buffer, whereas DDR2’s is 4 bits, and DDR’s is 2 bits deep.

Memory Modules

Standard	Memory		Cycle	I/O Bus		Data transfers per	Module	Peak transfer
name		clock	time		clock	second	name	rate
DDR3-1066	133	MHz	7.5 ns	533	MHz	1066 Million	PC3-8500	8533 MB/s
DDR3-1333	166	MHz	6 ns	667	MHz	1333 Million	PC3-10600	10667 MB/s

Supported Memory Configurations

Single Processor Memory Configurations

Size DIMM DIMM1 DIMM2 DIMM3 DIMM4 DIMM5 DIMM6

(GB) Ranks

3	SR	1 GB	1 GB	1 GB
4	SR	1 GB	1 GB	1 GB	1 GB
4	MR	2 GB	1 GB	1 GB	1 GB
6	SR	2 GB	2 GB	2 GB
8	MR	2 GB	2 GB	2 GB	1 GB	1 GB
12	SR	2 GB	2 GB	2 GB	2 GB	2 GB	2 GB
12	DR	4 GB	4 GB	4 GB
24	DR	4 GB	4 GB	4 GB	4 GB	4 GB	4 GB
24	DR	8 GB	8 GB	8 GB
32	MR	8 GB	8 GB	4 GB	4 GB	4 GB	4 GB
48	DR	8 GB	8 GB	8 GB	8 GB	8 GB	8 GB
96	QR	16 GB	16 GB	16 GB	16 GB	16 GB	16 GB

Dual Processor Memory Configurations

Size

DIMM

Riser

(GB)

Ranks

DIMM1

DIMM2

DIMM3

DIMM4

DIMM5

DIMM6

DIMM1

DIMM2

DIMM3

DIMM4

DIMM5

DIMM6

1 GB

2 GB

1 GB

2 GB

1 GB

2 GB

4 GB

2 GB

8 GB

4 GB

8 GB

128

16 GB

8 GB

16 GB

8 GB

192

(RHEL

16 GB

ONLY)

NOTE: If more than one Quad rank DIMM is installed within a channel (DIMM1 & DIMM4, DIMM2 & DIMM5, DIMM3 & DIMM6) then the maximum DDR3 speed is reduced to 800 MHz. Spreading Quad Rank memory modules accross multiple channels is recommended.

NOTE: DDR3 DIMMs have 240 pins, the same number as DDR2, and are the same size, but are electrically incompatible and have a different key notch location.

Memory Subsystem

The memory subsystem consists of three DDR3 memory channels attached to each processor. All single-processor configurations have six DIMM slots (two per channel) attached to the primary processor located on the system board. Dual-processor configurations require an optional riser card that contains the secondary processor and the DIMMs associated with the secondary processor. There are six DIMM slots on the riser, for a total of twelve DIMMs in the system.

DIMM slot configuration for a single processor or a second processor on the riser.

Memory Slots

There are six memory slots on the system board. The slots are numbered DIMM1 through DIMM6. DIMM1 is furthest from the processor.

In addition, the dual-processor riser features six additional memory slots. The slots are numbered DIMM1 through DIMM6. DIMM1 is furthest from the processor.

Memory Population Rules

Your computer requires DIMMs within a channel to be populated starting with the DIMMs farthest from the processor first. This means the DIMM slots 1, 2 and 3 must be populated before DIMM slots 4, 5 and 6. In addition, when populating a Quad-rank DIMM with a Singleor Dual-rank DIMM in the same channel, the Quad-rank DIMM must be populated farthest from the CPU.

To maximize available memory bandwidth, DIMMs within a configuration should generally be spread across as many channels as possible before populating multiple DIMMs per channel. The population guidelines below help to achieve this.

Single CPU configurations (6 DIMM slots on MB)

If configuration contains DIMMs of all the same size, populate in the following order: DIMM1, DIMM2, DIMM3, DIMM4, DIMM5, DIMM6

If configuration contains DIMMs of mixed sizes, populate the larger DIMMs first. For example, for a 4GB configuration consisting of one 2GB DIMM and two 1GB DIMMs, the population would be DIMM1=2GB, DIMM2=1GB, DIMM3=1GB, DIMM4=empty, DIMM5=empty, DIMM6=empty.

Dual CPU configurations (6 DIMM slots on MB plus 6 DIMM slots on Riser)

If configuration contains DIMMs of all the same size, populate in the following order: MB_DIMM1, Riser_DIMM1, MB_DIMM2, Riser_DIMM2, MB_DIMM3, Riser_DIMM3, MB_DIMM4, Riser_DIMM4, MB_DIMM5, Riser_DIMM5, MB_DIMM6, Riser_DIMM6. If configuration contains DIMMs of mixed sizes, populate the larger DIMMs in the dual-processor riser.

NOTE: If any DIMMs are >30mm tall (possible early 16GB DIMMs), they must be installed on the system board only.

About Your System Board

Dell Precision™ T7500 Service Manual

System Board Schematic

Clearing Forgotten Passwords

Clearing CMOS Settings

System Board Schematic

1SATA Connectors (SATA0-3)

2 Main Power Connector (POWER1)

3 SAS Connectors (HDD0-3)

4Hard Drive Fan Connector (FAN_HDD)

18Front Panel Audio Connector (FP_AUDIO)

19 Type A USB Port (INT_USB2)

20 Rear Fan Connector (FAN_REAR)

21 CPU Riser 2 (CPU2_RSR2)

5 Password Jumper (PSWD)

6Hard Drive Fan Connector (FAN_HDD2)

7 Floppy Drive (DSKT)

8 Front Panel Connector (FRONTPANEL)

9Front Panel 1394 Connector (FP_1394)

10Chassis Intrusion Header (INTRUDER)

11PCI-X Card Slot (SLOT7)

12PCI Express 2.0 x16 Card Slot, wired as x4 (SLOT6)

13 PCI Card Slot (SLOT5)

14PCI Express 2.0 x16 Card Slot (SLOT4)

15PCI Express 2.0 x16 Card Slot, wired as x8 (SLOT3)

16PCI Express 2.0 x16 Card Slot (SLOT2)

22 CPU Riser 1 (CPU_RSR1)

23 Primary Processor Connector (CPU1)

24 Power Connector (POWER_CPU1)

25 Front Fan Connector (FAN_FRONT)

26Card Cage Fan (FAN_CCAG)

27Memory Module Connectors (DIMM1-6)

28Optional Serial/PS2 Connector (SERIAL2)

29Auxiliary Hard-drive LED Connector (AUX_LED)

30 Battery Socket (BATTERY)

31Internal Speaker Connector (INT_SPKR)

32Flexbay USB (INT_USB)

33RTC Reset Jumper (RTCRST)

17PCI Express 2.0 x16 Card Slot, wired as x8 (SLOT1)

Clearing Forgotten Passwords

1.Remove the computer cover.

2.Locate the 4-pin password connector (PSWD) on the system board.

3.Remove the 2-pin jumper plug from pins 3 and 4 and set the jumper plug aside.

4.Replace the computer cover.

5.Connect your keyboard and mouse, then connect your computer and monitor to electrical outlets and turn them on.

6.After the operating system loads, turn the computer off.

Ensure that the computer is off and not in a power management mode. If you cannot shut down the computer using the operating system, press and hold the power button for 4 seconds.

NOTE: Ensure that the computer is off and not in a power management mode. If you cannot shut down the computer using the operating system, press and hold the power button for 6 seconds.

7.Disconnect the keyboard and mouse, then disconnect the computer and monitor from their electrical outlets.

8.Press the power button on the computer to ground the system board.

9.Remove the computer cover.

10.Replace the 2-pin jumper plug onto pins 3 and 4 of the password connector (RTCRST_PSWD) on the system board.

NOTE: The password jumper plug must be reinstalled on the password jumper pins in order to enable the password feature.

11. Connect your computer and devices to electrical outlets, and then turn them on.

NOTE: In System Setup, both system and administrator password options appear as Not Set. The password feature is enabled, but a password is not assigned.

Clearing CMOS Settings

NOTE: The computer must be disconnected from the electrical outlet to clear the CMOS setting.

1.Remove the computer cover.

2.Locate the 4-pin password connector (PSWD) on the system board.

3.Remove the 2-pin jumper plug from pins 3 and 4.

4.Locate the 4-pin CMOS jumper (RTCRST) on the system board.

5.Move the 2-pin jumper plug from the password jumper to pins 1 and 2 of the CMOS jumper.

6.Plug in AC power to the system and wait ten seconds for the CMOS to clear.

7.Move the 2-pin jumper plug back to pins 3 and 4 of the password jumper.

8.Replace the computer cover.

9.Connect your computer and devices to electrical outlets, and turn them on.

NOTE: You can use the RTCRST jumper procedure above to attempt recovery from a No POST, No Video situation.

System Setup

Dell Precision™ T7500 Service Manual

POST Keystrokes

Boot Menu

Entering System Setup

System Setup Navigation Keystrokes

POST Keystrokes

Your computer has several keystroke options available during the POST process at the Dell™ Logo screen.

Keystroke

Function

Description

	< F2>	Enter System
	< F2>	Setup
		Setup
	< F12> or	Enter Boot Menu
	<Ctrl><Alt><F8>	Enter Boot Menu
	< F3>	Network Boot

Use System Setup to make changes to the user-definable settings.

One-time boot and diagnostics utility menu

Bypass the BIOS boot sequence and boot directly to the network

Boot Menu

As with previous Dell Precision™ workstation platforms, your computer includes a one-time boot menu. This feature offers a quick and convenient method with which to bypass the System Setup-defined boot device order and boot directly to a specific device (e.g., floppy, CD-ROM, or hard drive).

The boot menu enhancements introduced on previous platforms are as follows:

Easier access—Although the <Ctrl><Alt><F8> keystroke still exists and can be used to call up the menu, you can also simply press <F12> during system boot to access the menu.

Diagnostics options—The boot menu includes two diagnostic options, IDE Drive Diagnostics (90/90 Hard Drive Diagnostics) and Boot to the Utility Partition.

Entering System Setup

Press <F2> to enter System Setup and change the user-definable settings. If you have trouble entering System Setup using this key, press <F2> when the keyboard LEDs first flash.

Follow the on-screen instructions to view and/or change any settings. On each screen, the system setup options are listed at the left. To the right of each option is the setting or value for that option. You can change settings that appear as white type on the screen. Options or values that you cannot change (because they are determined by your Tablet-PC) appear less bright.

The upper-right corner of the screen displays help information for the currently highlighted option. The lower-right corner displays information about the computer. System setup key functions are listed across the bottom of the screen.

The system setup screens display the current setup information and settings for your computer, such as:

System configuration

Boot order

Boot (start-up) configuration

Basic device configuration settings

System security and hard drive password settings

System Setup Navigation Keystrokes

Use the following keystrokes to navigate the BIOS screens.

	Navigation Keystrokes
Action	Keystroke
Expand and collapse field	<Enter>, leftand right-arrow keys, or +/–
Expand or collapse all fields	< >
Exit BIOS	<Esc>—Remain in Setup, Save/Exit, Discard/Exit
Change a setting	Leftand right-arrow keys
Select field to change	<Enter>
Cancel a modification	<Esc>
Reset defaults	<Alt><F> or Load Defaults menu option