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Removing and Replacing Parts: Dell PowerEdge 2500 and 2500SC Systems Service Manual

Removing and Replacing Parts: Dell™ PowerEdge™ 2500 and 2500SC Systems Service Manual

	Overview		Cooling Shroud
	Inside the Chassis		Power Supply
	Front Bezel		Power Distribution Module
	System Cover		System Board
	Peripheral Bay		Expansion Cards
	Control Panel Assembly		RAID
	Chassis Intrusion Switch		Memory Modules
	Drives		Microprocessor
	SCSI Backplane Board		Voltage Regulator Module
	SCSI Backplane Daughter Card		Battery
	Cooling Fans

Overview

The procedures in this guide require that you remove the cover and work inside the system. While working inside the system, do not attempt to service the system except as explained in this manual and elsewhere in Dell documentation. Always follow the instructions closely. Make sure to review all of the procedures in �Safety Instructions� in your System Information document.

This section provides servicing procedures for components inside the system. Before you start any of the procedures in this section, perform the following tasks:

Perform the procedures described in �External Visual Inspection.�
Read the safety information in the System Information booklet.

When there is no replacement procedure provided, use the removal procedure in reverse order to install the replacement part.

Recommended Tools

You need the following items to perform the procedures in this section:

The Dell Diagnostics diskette set appropriate for your system
System User's Guide
System Installation and Troubleshooting Guide
Key to the system keylock
#1 and #2 Phillips screwdriver
Wrist grounding strap

System Versions

There are two versions of this system: a rack version and a tower version.

Figure 1. Rack and Tower Versions

Inside the Chassis

In Figure 2, the system cover and front bezel are removed to provide an interior view. Refer to this illustration to locate interior features and components discussed later in this manual.

Figure 2. Inside the System (Right-Side View)

1	Rear cooling fan assembly
2	PCI expansion cards
3	SCSI backplane board
4	Power supplies (3)
5	Hard-disk drives (6)
6	CD-ROM/diskette drive
7	Removable peripheral bay
8	Daughter card
9	Front cooling fan assembly
10	Cooling shroud

The system board (not visible in Figure 2) holds the system's control circuitry and other electronic components. Several hardware options such as the microprocessors and memory are installed directly on the system board. The system board can accommodate up to seven expansion cards. The peripheral bay provides space for two 1-inch hard-disk drives.

The hard-disk drive bays provide space for up to six 1-inch SCSI hard-disk drives. These hard-disk drives are connected to an integrated SCSI controller on the system board or to a SCSI or RAID expansion card, via the SCSI backplane card.

The power cords leading from the power supply distribute power to the system board and the SCSI backplane board. The SCSI backplane board provides power to the hard-disk drives.

For non-SCSI drives such as the diskette drive and the CD-ROM drive, an interface connector connects each drive to the SCSI backplane board. For SCSI devices, 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. See the appropriate drive procedure for detailed removal and replacement instructions.

During a service procedure, you might be required to change a jumper or switch setting. For information on the system board jumpers, see "Jumpers and Connectors."

Front Bezel

To open and remove the optional front bezel of the system, perform the following steps.

CAUTION: See the safety instructions in your System Information booklet before working inside your system.

Use the system key to unlock the bezel.
Pull on the left side (for rack versions) or the top (for tower versions) of the bezel and swing open until it is perpendicular to the system front panel (see Figure 3).

Use this position to insert and remove diskettes and CDs and to replace hard-disk drives.

Figure 3. Front Bezel Removal

1	Retaining pins
2	Retaining grooves

NOTE: Continue with the rest of the procedure if you wish to completely remove the bezel from the front panel.

Squeeze the retaining pins and rotate the pins into the retaining grooves to remove the bezel.
Pull the bezel away from its hinge and set it aside, out of the way.

System Cover

The system has a cover that provides access to system components and expansion cards.

The cover is attached to the main chassis with thumbscrews on the front panel. To remove the system cover, perform the following steps.

CAUTION: See the safety instructions in your System Information booklet before working inside your system.

Shut down the system and turn off power to the system.
Disconnect the power cord from the back of the system chassis.
Label and disconnect all peripheral cables attached to the back of the system chassis.
Open the front bezel.
Loosen the three captive thumbscrews that secure the front panel to the chassis (see Figure 4).

Figure 4. Removing the System Cover

1	Thumbscrews (3)

Slide the system cover backwards and grasp the cover at both ends.
Carefully lift the cover away from the system.

To replace the system cover, perform the following steps:

Check that no tools, parts, or unconnected cables are left inside the system.
Fit the cover over the sides of the chassis, and slide the cover forward.
Secure the cover with the three thumbscrews.
Close and lock the bezel with the system key (see Figure 3).
Install the power and peripheral cables to the back of the system chassis.
Turn on the power to the system.

The system will take a few minutes to boot.

Peripheral Bay

In Figure 5, the peripheral bay is shown being removed from the system chassis.

Figure 5. Peripheral Bay Removal

1	Peripheral bay
2	Thumbscrew

To remove the peripheral bay, perform the following steps:

Turn off the system, including any attached peripherals, and disconnect the system from its electrical outlet.
Open the front bezel.
Remove the system cover.
Remove the front fan assembly.
Disconnect the interface cable from the interposer board attached to the CD-ROM/diskette drive.
Disconnect any cables from any devices already installed in the peripheral bay.
Loosen the thumbscrew securing the peripheral bay to the chassis (see Figure 5).

NOTE: To slide the peripheral bay backward, you may need to disconnect the power cable on the SCSI backplane board.

Drive Cage Removal

To remove the drive cage, perform the following steps:

Remove the peripheral bay.

Figure 6. Drive Cage Removal

1	Screws (4)
2	Peripheral bay
3	Drive cage
4	1x2 backplane

Remove the four screws that secure the drive cage to the peripheral bay (see Figure 6).
Carefully slide the drive cage, together with its 1x2 backplane and daughter card out of the peripheral bay.

NOTE: Following the installation of the replacement peripheral bay, cable the 1x2 backplane as shown in Figure 7.

Figure 7. 1x2 Backplane Cabling

1	20-pin Inter-integrated circuit (I²C) cable connector on system board
2	10-pin I²C cable connector on 1x2 backplane
3	power connector on 1x2 backplane
4	SCSI connector
5	Cooling shroud cable clips

Control Panel Assembly

In Figure 8, the control panel is shown removed from the system chassis.

Figure 8. Control Panel Removal

1	6-32 x 0.25-inch Phillips screw (3)
2	Control panel bracket
3	Control panel board
4	Chassis intrusion switch

To remove the control panel assembly, perform the following steps.

CAUTION: Read the safety instructions in your System Information document.

Open the front bezel.

Remove the system cover.
Remove the peripheral bay.
Disconnect the ribbon cable from the system board (FRONT PANEL).
Remove the two hex-head Phillips screws that secure the control panel bracket to the floor of the chassis, and then slide back and lift the control panel and its bracket up and out of the system chassis.
Loosen the screw securing the control panel board to its bracket.
Slide the control panel board to the right to remove it from the control panel bracket.

Chassis Intrusion Switch

To remove the chassis intrusion switch, perform the following steps.

CAUTION: Read the safety instructions in your System Information document.

Remove the front bezel.
Remove the system cover.
Disconnect the chassis intrusion switch cable from its connector on the system board.
Grasp and slide the switch toward the center of the front panel until it slides free of its slot (see Figure 8).

Drives

Figure 9 shows examples of drive hardware that can be installed in the system. Refer to this figure when you perform any of the procedures in the following subsections.

Figure 9. Drive Hardware

1	SCSI backplane board
2	SCSI backplane daughter board
3	Diskette/CD-ROM drive
4	Peripheral bay (2 slots)
5	SCSI hard-disk drive bay (6 slots)

Diskette/CD-ROM Drive Removal

To remove the integrated diskette/CD-ROM drive, perform the following steps:

Turn off the system and any attached peripherals, and disconnect them from the electrical outlet.
Open the front bezel.
Remove the system cover.
Disconnect the diskette/CD-ROM drive interface cable from the connector on the interposer board on the back of the diskette/CD-ROM drive assembly.
Disconnect any devices installed in the peripheral bay.
Remove the peripheral bay.
Lift the retention latch at the back of the integrated diskette/CD-ROM drive (see Figure 10).

Figure 10. 3.5-inch Diskette/CD-ROM Drive Removal

1	Diskette/CD-ROM drive
2	Drive release latch
3	Peripheral bay
4	Locking clips (4)

Slide the drive assembly forward approximately 12.5 mm (0.5 inch) to release the assembly from its locking clips, and then lift the assembly off the top of the peripheral bay.

When reinstalling the replacement integrated diskette/CD-ROM drive assembly, make sure that the retaining tabs at the sides of the drive assembly engage the four locking clips on the peripheral bay (see Figure 10).

SCSI Hard-Disk Drive Removal

Each SCSI hard-disk drive is mounted in a hard-disk drive carrier.

NOTICE: Hot-pluggable hard-disk drives are only supported if the optional integrated RAID controller (or an approved PCI RAID controller card) and appropriate software is installed.

CAUTION: Read the safety instructions in your System Information document.

If an approved optional RAID controller and software are installed, hot-pluggable drives might be individually shut down and replaced while the system is operating.

To remove a hard-disk drive and its carrier, perform the following steps.

CAUTION: Read the safety instructions in your System Information document.

If the system does not have an approved RAID controller installed, shut down the system and disconnect the cables.
Open the bezel.
For systems with RAID controllers, shut down the hard-disk drive slot you intend to remove.

Wait until both SCSI hard-disk drive indicators on the drive carrier handle are turned off before proceeding.
Open the drive carrier handle and slide the carrier toward you until it is free of the drive bay (see Figure 11).

Figure 11. Hard-Disk Drive and Carrier Removal

1	Hard-disk drive carrier latch

If your replacement hard-disk drive is installed in its carrier, open the handle on the carrier.
If the replacement hard-disk drive has no carrier, remove the faulty hard-disk drive from its carrier:

Remove the four screws that secure the drive to the carrier (see Figure 12).
Remove the hard-disk drive from the carrier.

Figure 12. Hard-Disk Drive Removal From Carrier

1	Screws (4)
2	Hard-disk drive
3	Hard-disk drive carrier

To install a replacement hard-disk drive, perform the following steps:

Insert the replacement hard-disk drive into the carrier and install four screws to secure the drive.
Open the handle on the carrier and install the replacement hard-disk drive and carrier into its slot in the drive bay (see Figure 11).
Close the handle until it engages the front panel, locking the drive in place.
Close the front bezel.
If the drive is a hot-pluggable replacement that has already been prepared, turn on the drive bay and reintegrate the drive.

If the replacement drive is not a hot-pluggable hard-disk drive, run the Dell Diagnostics to test and prepare the new drive.

SCSI Backplane Board

The SCSI backplane board has connectors on the front that connect to the six hard-disk drives and to the front fan assembly. On the back of the SCSI backplane board are connectors for connecting cables to the system board SCSI connectors or to an expansion card connector. Also on the back of the SCSI backplane board is a DC power connector (BP POWER) for connecting a power cable from the non-redundant power supply or from the power distribution module.

CAUTION: Read the safety instructions in your System Information document.

Figure 13. SCSI Backplane

1	Thumbscrew
2	SCSI backplane board

To remove a SCSI backplane board, perform the following steps.

CAUTION: Read the safety instructions in your System Information document.

Open the front bezel.
Remove the system cover.
Remove the front fan assembly.
Pull each hard-disk drive carrier partially out of its slot, approximately 2.5 cm (1 inch).

Label and disconnect two SCSI cables attached to the SCSI backplane board (see Figure 14).

Label and disconnect the I²C cable connector from the SCSI backplane board.

Disconnect the DC power cable (11HMF) from its power input connector on the SCSI backplane board (BP POWER).

Loosen the thumbscrew securing the SCSI backplane board to the chassis.
Move the SCSI backplane board up about 12.7 millimeters (0.5 inch), then pull the SCSI backplane board away, off its grounding tabs (toward the back of the system), and then lift the SCSI backplane board up and out of the system chassis.

Figure 14. SCSI Backplane Connections

1	Power connector (POWER2)
2	Cable retention clips (2)
3	SCSIA cable connector
4	20-pin inter-integrated circuit (I²C) cable connector
5	SCSIB cable connector

When installing a replacement SCSI backplane board, see Figure 14 for cable connections. Make certain that all ribbon cables are routed under the clips on the top of the cooling shroud.

SCSI Backplane Daughter Card

To replace the SCSI backplane daughter card (used to operate the SCSI backplane in a 2x3 split backplane configuration), perform the following steps:

CAUTION: Read the safety instructions in your System Information document.

Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet.

CAUTION: Read the safety instructions in your System Information document.

Figure 15. SCSI Backplane Daughter Card Removal

1	Retention lever
2	Lock tab
3	SCSI backplane daughter card
4	SCSI backplane connector

Open the front bezel.
Remove the system cover.
Press the lock tab down as you swing the retention lever into the open position.

The card will be pulled away from its connector on the SCSI backplane board.
Lift the card up and out of the card guides in the drive bay.

Cooling Fans

There are two fan assemblies, each containing two individual fans. The front fan assembly is located near the SCSI backplane board. The rear fan assembly is attached to the back panel.

CAUTION: Read the safety instructions in your System Information document.

Removing the Front Fan Assembly

Open the front bezel.
Remove the system cover.
Release the fan assembly by pressing the release lever (see Figure 16).

Figure 16. Removing the Front Fan Assembly

1	Release lever
2	Hinge half

Swing the fan assembly up 90� and then slide it forward about 6.35 mm (0.25 inch) to remove it from the hinge half on the side of the chassis.
Disconnect the fan assembly power cable from the front fan connector on the SCSI backplane board.

Removing the Back Fan Assembly

Open the front bezel.
Remove the system cover.
Remove the cooling shroud.
Press the release latch and lift the fan assembly straight up to clear the chassis (see Figure 17).

Figure 17. Removing the Back Fan Assembly

1	Release latch

Disconnect the fan assembly power cable from the fan connector (REAR FAN) on the system board.

NOTICE: It is not necessary to shut down the system or turn off power if a single fan stops operating or the amber fault indicator on the system front lights up.

Fan Removal

If you observe that a fan is not operating or if the server management application issues a fan-related error message, perform the following steps to replace the faulty fan.

CAUTION: Read the safety instructions in your System Information document.

CAUTION: The cooling fans are hot-pluggable. To maintain proper cooling while the system is on, only replace one fan at a time.

Open the front bezel.
Remove the system cover.
Locate the faulty fan and while pressing the release lever, grasp the fan and lift straight up to clear the fan assembly (see Figure 18).

Figure 18. Removing a Cooling Fan

1	Release lever
2	Fan connector

Install a replacement fan in the assembly and press it firmly into its slot until the release lever clicks.

The fan will only install one way. Ensure that the connector is firmly seated in its socket and the fan power connector is fully seated.

Cooling Shroud

CAUTION: Read the safety instructions in your System Information document.

To replace the cooling shroud, perform the following steps:

Open the front bezel.
Remove the system cover.

Figure 19. Removing Cooling Shroud Thumbscrews

1	Thumbscrews (2)

Remove any ribbon cables secured by clips to the top of the cooling shroud.
Loosen, but do not remove the two thumbscrews securing the cooling shroud to the system (see Figure 19).
Rotate the cooling shroud up and lift to clear the rear cooling fan assembly and chassis (see Figure 20).

Figure 20. Rotating Cooling Shroud

Power Supply

Your system may have a single non-redundant power supply, or it may have three hot-pluggable, redundant power supplies.

CAUTION: Read the safety instructions in your System Information document.

Figure 21. Non-Redundant Power Supply Removal

1	Non-redundant power supply
2	Screws (4)

To remove a non-redundant power supply, perform the following steps.

CAUTION: Avoid touching the cable connectors on the power supply. Wait 10 to 20 seconds after disconnecting the power cord before removing the power supply or coming into contact with its cable connectors.

Turn off the system, including any attached peripherals, and disconnect the system from its electrical outlet.
Open the front bezel.
Remove the system cover.
Disconnect the DC power connections:
1. Remove four power connectors on the system board (MB POWER1 to MB POWER4).
2. Remove the power connector from the SCSI backplane board (BP POWER).
3. Remove power connectors to any devices installed in the peripheral bay.
Remove the four hex-head Phillips screws securing the non-redundant power supply to the back of the system chassis.
Pull the non-redundant power supply out of the back of the system chassis.

Hot-Pluggable, Redundant Power Supply

To remove a hot-pluggable power supply, perform the following steps.

Figure 22. Hot-Pluggable Power Supply Removal

1	Release lever

Open the front bezel.
Remove the power supply by grasping the power supply handle, pressing down on the release lever, and pulling the power supply straight out to clear the chassis (see Figure 22).

Power Distribution Module

To remove a power distribution module (PDM), perform the following steps.

Figure 23. Power Distribution Module Removal

1	Power distribution module
2	Screws (4)

Turn off the system, including any attached peripherals, and disconnect the system from its electrical outlet.
Open the front bezel.
Remove the system cover.
Remove the three power supplies.
Disconnect both ends of the following DC power cables:
1. Remove the power cable labeled 64UYM from PDM connector MB POWER1 and from system board connector MB POWER1.
2. Remove the power cable labeled 08PUD from PDM connector MB POWER2 and from system board connector MB POWER2.
3. Remove the power cable labeled 547XP from PDM connector MB POWER3 and from system board connector MB POWER3.
4. Remove the power cable labeled 11HMF from PDM connector SCSI PB POWER and from SCSI backplane board connector BP POWER.
5. Remove the power cable labeled 34UUY from PDM connector MB POWER4 and from system board connector MB POWER4.
6. Remove the power cable labeled 80MDT from PDM connector MEDIA BAY POWER and from any external media bay devices.
Remove the four 6-32 x 0.25-inch hex-head Phillips screws securing the PDM to the back of the system chassis.
Pull the PDM out of the back of the system chassis.

To install a PDM, perform the following steps:

Secure the PDM using the four 6-32 x 0.25-inch hex-head Phillips screws that you removed in step 6 of the removal procedure.
Connect the power cables as follows:
1. Connect the cable labeled 64UYM to PDM connector MB POWER1 and system board connector MB POWER1.
2. Connect the cable labeled 08PUD to PDM connector MB POWER2 and system board connector MB POWER2.
3. Connect the cable labeled 547XP to PDM connector MB POWER3 and system board connector MB POWER3.
4. Connect the cable labeled 11HMF to PDM connector SCSI BP POWER and SCSI backplane board connector BP POWER.
5. Connect the cable labeled 34UUY to PDM connector MB POWER4 and system board connector MB POWER4.
6. Connect the cable labeled 80MDT to PDM connector MEDIA BAY POWER and to any external media bay devices.
Install the three power supplies into the three front-panel bays.
Replace the system cover.
Close the front bezel.
Reconnect the system and peripherals to their power sources and turn them on.

System Board

Figure 24. System Board Removal

1	System board
2	Thumbscrew

To remove the system board, perform the following steps.

CAUTION: Read the safety instructions in your System Information document.

Turn off the system, including any attached peripherals, and disconnect the system from its electrical outlet.

Remove the front bezel.
Remove the system cover.
Remove the cooling shroud.
Remove the front fan assembly.
Remove the back fan assembly.
Remove the optional RAID key, if installed.
Remove the optional RAID DIMM, if installed.
Disconnect the four DC power connectors on the system board (MB POWER1 through MB POWER4).
Remove all external peripheral cables from their connectors at the back of the system.
Record the locations and remove all internal cables attached to the system board.
Remove the expansion cards.
Unscrew the thumbscrew securing the system board to the chassis floor.
Slide the system board toward the front of the system chassis about 6.3 mm (0.25 inch).
Carefully lift the system board up and out of the chassis.

Be sure to lift evenly and not twist the system board.
Place the system board on a smooth, antistatic surface.
Remove the microprocessors.
Remove the voltage regulator modules (VRMs).
Remove the memory modules.

To replace the system board, perform the following steps:

Press the system board evenly onto all the grounding tabs on the floor of the chassis and then, slide it to the rear about 6.3 mm (0.25 inch).
Tighten the thumbscrew to secure the system board to the chassis floor.
Install the memory modules.
Install the microprocessors.
Install the voltage regulator modules (VRMs).
Check to ensure the system board jumpers and switches are set to the same settings as the board you removed.
Install the expansion cards.
Connect all internal power and signal interface cables.
Install the optional RAID key, if installed.
Install the optional RAID DIMM, if installed.
Install the back fan assembly.
Install the front fan assembly.
Install the cooling shroud.
Replace the system cover.
Replace the front bezel.
Connect external peripheral cables.
Connect the power to the system and turn the system on.

System Board Features

Figure 25 defines the system board features. Use this figure when replacing your system board or components that attach to the system board.

Figure 25. System Board Features

1	Memory module sockets (6) (DIMM_x)
2	Keyboard (KYBD) and mouse (MOUSE) connectors
3	USB connectors (2) (USBn)
4	Parallel port (PARALLEL) and serial port (COMn) connectors
5	RJ45 NIC connector (ENET)
6	Video connector (VGA)
7	Rear fan assembly connector (REAR FAN)
8	Battery connector (BATTERY)
9	PCI expansion card slots (7) (SLOT_n)
10	RAID DIMM slot (DIMM_RAID)
11	Primary processor VRM (PROCESSOR_n VRM)
12	SCSIB connector (SCSIB)
13	PCI card guide
14	SCSIA connector (SCSIA)
15	Diskette/CD-ROM connector (FLOPPY/IDE)
16	Primary microprocessor (PROCESSOR_n)
17	I²C connector (PLANAR)
18	Power connectors (4) (MB POWERn)
19	Control panel connector (FRONT PANEL)
20	RAID battery connector (RAID BTRY)
21	Intrusion switch connector (INTR)
22	Secondary processor VRM (PROCESSORn VRM)
23	Secondary processor (PROCESSORn)
24	RAID key (RAID_KEY)

Expansion Cards

The system has seven fixed PCI expansion-card sockets.

CAUTION: Read the safety instructions in your System Information document.

Figure 26. Expansion Card Removal

1	Expansion card latch

Expansion Card Removal

To remove an expansion card, perform the following steps.

CAUTION: Read the safety instructions in your System Information document.

Turn off the system, including any attached peripherals, and disconnect the system from its electrical outlet.
Open the front bezel.
Remove the system cover.
Remove the front fan assembly.
Release the expansion card latch (see Figure 26).
Record the locations of any cables attached to the expansion card.
Lift the expansion card out of its socket and set it aside.

To install a replacement or an additional expansion card, perform the following steps:

Prepare the replacement expansion card for installation.

See the documentation that came with the expansion card for information on configuring the card, making internal connections, or otherwise customizing the card for the system.
If the replacement card is an identical replacement, ensure that any jumpers or configuration switches are set in an identical manner as the expansion card you just removed.
Locate the slot from which you removed the faulty expansion card.

If this is an additional expansion card, select the expansion slot in which you will install the new expansion card.
Insert the card-edge connector on the replacement card firmly into the connector on the system board.
Position the expansion card so that the board-edge connector is aligns with the expansion card connector on the system board.
Insert the card-edge connector firmly into the expansion card connector until the card is fully seated.
When the card is fully seated in the connector and the card-mounting bracket is aligned with the brackets on either side of it, close the expansion card latch.
Connect any cables that should be attached to the card.

See the documentation that came with the card for information about cable connections.
Replace the front fan assembly.
Replace the system cover.
Replace the front bezel.

RAID

The integrated RAID option adds three components to the system board: a RAID hardware key, a RAID memory module, and a RAID memory backup battery module, located beneath the peripheral bay. You must turn off the system power and disconnect the power cords before replacing any of these three components.

CAUTION: Read the safety instructions in your System Information document.

RAID Hardware Key Replacement

Figure 27. RAID Hardware Key Removal

Open the front bezel.
Remove the system cover.
Press down and outward on the ejectors on each end of the RAID hardware key socket (RAID_KEY) until the RAID hardware key pops out of the socket (see Figure 27).

RAID DIMM Replacement

Figure 28. RAID Memory Module

1	Socket ejectors

Open the front bezel.
Remove the system cover.
Press down and outward on the ejectors on each end of the RAID memory module socket (RAID_DIMM) until the memory module pops out of the socket (see Figure 28).

RAID Memory Backup Battery

Figure 29. RAID Memory Backup Battery

1	RAID backup battery

Open the front bezel.
Remove the system cover.
Remove the peripheral bay.
Disconnect the battery cable from the RAID battery connector (RAID_BTRY) on the system board (see Figure 25).
Press the release clip on the RAID battery and lift straight up to clear the system chassis (see Figure 29).

Memory Modules

The six memory module sockets on the system board can accommodate 128 MB to 4 GB of registered SDRAM. The memory module sockets are arranged in pairs which consist of three banks (bank 1 � bank 3). These banks are located near the back edge of the system board (see Figure 25) next to the cooling fan assembly.

CAUTION: Read the safety instructions in your System Information document.

System Memory Upgrade Kits

The system is upgradeable to 4 GB by installing combinations of 64-, 128-, 256-, 512-MB, and 1-GB registered memory modules. If you receive an error message stating that the maximum memory has been exceeded, see �Codes and Error Messages.� You can purchase memory upgrade kits from Dell as needed.

NOTE: The memory modules must be PC-133 compliant.

Memory Module Installation Guidelines

Starting with the socket nearest the fans, the memory module sockets are labeled "DIMM_A" through "DIMM_F" (see Figure 30). When you install memory modules, follow these guidelines:

You must install memory modules in matched pairs (see Figure 30).
Install a pair of memory modules in socket DIMM_A and DIMM_B before installing a second pair in sockets DIMM_C and DIMM_D.

Figure 30. DIMM Socket Locations

1	DIMM_F
2	DIMM_E
3	DIMM_D
4	DIMM_C
5	DIMM_B
6	DIMM_A
7	Bank 3
8	Bank 2
9	Bank 1

Table 2 illustrates several sample memory configurations based on these guidelines.

Table 2. Sample DIMM Configurations

Total Desired Memory	DIMM_A	DIMM_B	DIMM_C	DIMM_D	DIMM_E	DIMM_F
128 MB	64 MB	64 MB	None	None	None	None
256 MB	128 MB	128 MB	None	None	None	None
512 MB	128 MB	128 MB	128 MB	128 MB	None	None
512 MB	256 MB	256 MB	None	None	None	None
1 GB	256 MB	256 MB	256 MB	256 MB	None	None
1.5 GB	256 MB	256 MB	256 MB	256 MB	256 MB	256 MB
2 GB	512 MB	512 MB	512 MB	512 MB	None	None
3 GB	512 MB	512 MB	512 MB	512 MB	512 MB	512 MB
4 GB	1 GB	1 GB	1 GB	1 GB	None	None

Performing a Memory Upgrade

To perform a memory upgrade to the system board, perform the following steps.

CAUTION: Read the safety instructions in your System Information document.

Turn off the system, including any attached peripherals, and disconnect the power cord from its power source.
Open the front bezel.
Remove the system cover.
Remove the cooling shroud.
Locate the memory module sockets in which you will install or replace memory module pairs.

Figure 30 shows the order of the memory module sockets.
Install or replace the memory module pairs as necessary to reach the desired memory total.
Replace the cooling shroud.
Replace the system cover.
Close the front bezel, reconnect the system to the electrical outlet, and turn on the system.

If you changed the amount of memory in the system, the system will complete the POST routine with an error message, indicating that the amount of system memory has changed.
The system detects that the new memory does not match the system configuration information, which is stored in nonvolatile RAM (NVRAM). The monitor displays an error message that ends with the following words:

Press <F1> to continue; <F2> to enter System Setup

Press <F2> to enter the System Setup program and check the System Memory setting in the system data box on the System Setup screens. The system should have already changed the value in the System Memory setting to reflect the newly installed memory.
If the System Memory value is incorrect, one or more of the DIMMs might not be installed properly. Repeat steps 1 through 5 again, checking to make sure that the memory modules are firmly seated in their sockets.
Run the system memory test in the Dell Diagnostics.
Replace the cooling shroud.
Replace the system cover.
Close the front bezel.

Installing Memory Modules

To install a memory module, perform the following steps.

CAUTION: Read the safety instructions in your System Information document.

Turn off the system, including any attached peripherals, and disconnect the power cord from its power source.
Open the front bezel.
Remove the system cover.
Remove the cooling shroud.
Locate the memory module sockets in which you will install a memory module.

Figure 30 shows the order of the memory module sockets.
Press down and outward on the ejectors on the memory module socket, as shown in Figure 31, to allow the memory module to be inserted into the socket.

Figure 31. Installing a Memory Module

1	Memory module socket ejectors (2)
2	Socket

Align the memory module's edge connector with the alignment keys of the memory module socket, and insert the memory module in the socket (see Figure 31).

The memory module socket has two alignment keys that allow the memory module to be installed in the socket in only one way.
Press down on the memory module with your thumbs while pulling up on the ejectors with your index fingers to lock the memory module into the socket (see Figure 31).
When the memory module is properly seated in the socket, the ejectors on the memory module socket should align with the ejectors on the other sockets with memory modules installed.
Repeat steps 6 through 8 to install the remaining DIMMs.
Perform steps 6 through 10 of the procedure, �Performing a Memory Upgrade.�

Removing Memory Modules

CAUTION: Read the safety instructions in your System Information document.

Turn off the system, including any attached peripherals, and disconnect the power cord from its power source.
Open the front bezel.
Remove the system cover.
Remove the cooling shroud.
Locate the memory module sockets in which you will remove a memory module.

Figure 30 shows the order of the memory module sockets.
Press down and outward on the ejectors on each end of the socket until the DIMM pops out of the socket (see Figure 32).

Figure 32. DIMM Removal

1	Memory module socket ejectors (2)

Microprocessor

The system board has two zero-insertion-force (ZIF) sockets which hold microprocessors and heat-sink assemblies.

If you are adding a microprocessor, the secondary microprocessor must have the same operating frequency as the first. For example, if the system has a 933-MHz primary microprocessor, your secondary microprocessor must also be a 933-MHz microprocessor. Also, each microprocessor must have its own voltage regulatory module (VRM) installed in a socket near the microprocessor.

NOTICE: If you are upgrading a system by installing a secondary microprocessor, or one or two higher-speed microprocessors, you must order your upgrade kits from Dell. The upgrade kits from Dell contain the correct version of the microprocessor for use as a secondary microprocessor, plus a VRM.

Microprocessor and Heat-Sink Assembly Removal

To remove the microprocessor and heat-sink assembly, perform the following steps.

CAUTION: Read the safety instructions in System Information document.

CAUTION: The microprocessor and heat-sink assembly can get extremely hot during system operation. Be sure the assembly has had sufficient time to cool before you touch it.

CAUTION: When handling the microprocessor and heat-sink assembly, take care to avoid sharp edges on the heat sink.

Turn off the system, including any attached peripherals, and disconnect the power cord from its power source.
Open the front bezel.

Remove the system cover.
Removing the cooling shroud.
Locate the microprocessor ZIF sockets into which you will install or replace a microprocessor and heat-sink assembly.
Pressing down on the heat-sink securing clip to release the clip from the retaining tab on the ZIF socket (see Figure 33).
Remove the securing clip.
Remove the heat sink and set it down with the underside of the heat sink facing up.

NOTICE: Note the orientation of the heat sink with respect to the microprocessor and its ZIF socket.

NOTICE: Be careful not to disturb the thermal grease applied to the underside of the heat sink, and to the top surface of the microprocessor.

Pull the socket release lever straight up until the microprocessor is released (see Figure 34)

Figure 33. Securing Clip and Heat Sink Removal

1	Securing clip
2	Heat-sink assembly
3	Microprocessor
4	ZIF socket

Lift the microprocessor away from the ZIF socket and leave the release lever in the upright position so that the socket is ready for the replacement microprocessor (see Figure 34).

Figure 34. Microprocessor Removal

1	Microprocessor chip
2	Release lever
3	ZIF socket

Microprocessor and Heat-Sink Assembly Replacement

To install the additional or replacement microprocessor and heat-sink assembly, perform the following steps.

This procedure assumes the system cover and front bezel have been removed, the system power is off and power cords and peripheral cables are disconnected.

Locate the microprocessor ZIF sockets into which you will install an additional or replacement microprocessor and heat-sink assembly.
Clean any thermal grease off the bottom of the heat sink with an alcohol wipe.
If not already in the upright position, swing the ZIF arm up to the upright position.

The ZIF socket is now ready to accept a new microprocessor.
Align the pin-1 corner of the microprocessor with the pin-1 corner of the ZIF socket (see Figure 35).

Figure 35. Pin 1 Identification

1	Pin 1 corner (golf triangle)

Install the microprocessor in the ZIF socket.

Gently lower the replacement or upgrade microprocessor into the ZIF socket so that the processor pins exactly mate with the ZIF socket.

Figure 36. Installing the Microprocessor

1	Pin 1 corner of microprocessor aligned with pin-1 corner of ZIF socket

NOTICE: Do not force the processor module into the socket. Even slight pressure can bend the microprocessor module pins.

When the microprocessor is fully seated in the ZIF socket, rotate the socket release lever down until it snaps into place, securing the microprocessor.
Apply a measured amount of thermal grease to the top of the microprocessor.
Place the heat sink on top of the microprocessor.

Figure 37. Installing the Heat Sink and Securing Clip

1	Securing clip
2	Heat sink
3	Microprocessor
4	ZIF socket

Hook the end of the heat-sink clip without the heat-sink latch to the tab on the edge of the socket facing the front of the system.
Push down on and pivot the heat-sink latch until the hole on the clip latches onto the ZIF socket tab.
Replace the system cover.
If you are installing a second microprocessor, install the VRM into its socket.
Make sure that the VRM socket latches engage.
Replace the cooling shroud.
Replace the system cover.
Close the front bezel, and reconnect the system to the electrical outlet, connect any peripheral cables you disconnected, and turn on the system.
Press <F2> to enter the System Setup program and check the Processor 1 and Processor 2 categories match the new system configuration.

See the system User's Guide for instructions.
As the system boots, it detects the presence of the new processor and automatically changes the system configuration information in the System Setup program. If you installed a second processor, the following message is displayed:

Two 933 MHz Processors, Processor Bus: 133 MHz, L2 cache 256 KB Advanced

If only one processor is installed, the following message is displayed:

One 933 MHz Processor, Processor Bus: 133 MHz, L2 cache 256 KB Advanced

Voltage Regulator Module

To replace the voltage regulator module (VRM) perform the following steps.

CAUTION: Read the safety instructions in System Information document.

CAUTION: The microprocessor and heat-sink assembly can get extremely hot during system operation. Be sure the assembly has had sufficient time to cool before you touch it.

CAUTION: When handling the microprocessor and heat-sink assembly, take care to avoid sharp edges on the heat sink.

Figure 38. Voltage Regulator Module Removal

1	Voltage regulator module (VRM)
2	Release latches (2)
3	VRM socket

Turn off the system, including any attached peripherals, and disconnect the power cord from its power source.
Open the front bezel.

Remove the system cover.
Removing the cooling shroud.
Locate the VRM socket into which you will install or replace a VRM.
Press down on the release latches on each end of the VRM socket, and the VRM will pop up from its socket.
Lift the VRM out of the socket.

Battery

The system battery maintains system configuration, date, and time information in a special section of memory when you turn off the system. The operating life of the battery ranges from 2 to 5 years, depending on how you use the system (for example, if you keep the system on most of the time, the battery gets little use and thus lasts longer). You may need to replace the battery if an incorrect time or date is displayed during the boot routine along with the following or similar message:

Time-of-day not set -- please run SETUP program

Strike the F1 key to continue, F2 to run the setup utility

System CMOS checksum bad -- Run SETUP

Strike the F1 key to continue, F2 to run the setup utility

Invalid configuration information -- please run SETUP program

Strike the F1 key to continue, F2 to run the setup utility

To determine if the battery needs replacing:

Reenter the time and date through the System Setup program.
Turn off and disconnect the system from the electrical outlet for a few hours.
Reconnect and turn the system on again.
Enter the System Setup program.

If the date and time are not correct in the System Setup program, replace the battery.

NOTES: Some software may cause the system time to speed up or slow down. If the system seems to operate normally except for the time kept in the System Setup program, the problem may be caused by software rather than by a defective battery.

If the system is turned off for long periods of time (for weeks or months), the NVRAM may lose its system configuration information. This situation is not caused by a defective battery.

You can operate the system without a battery; however, the system configuration information maintained by the battery in NVRAM is erased each time you shut down the system. Therefore, you must reenter the system configuration information and reset the options each time the system initializes until you replace the battery.

The battery is a 3.0-volt (V), coin-cell CR2032-type battery. To remove the battery, perform the following steps.

WARNING: Before you perform this procedure, you must turn off the system and disconnect it from its power sources. For more information, see the safety precautions in your system information document.

WARNING: There is a danger of a new battery exploding if it is incorrectly installed. Replace the battery only with the same or equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturer’s instructions.

Enter the System Setup program and, if possible, make a printed copy of the System Setup screens.

See �Using the System Setup Program� in the User's Guide for instructions.
Shut down the system, including any attached peripherals, and disconnect the system from the electrical outlet.

CAUTION: Read the safety instructions in your System Information document.

Open the front bezel.

NOTE: The next step may not be necessary if the system is mounted in the lower portion of the rack.

Remove the system cover.
Remove the battery (see Figure 25 for the battery location).

Pry the battery out of its socket with your fingers or with a blunt, nonconductive object such as a plastic screwdriver.
Install the new battery with the side labeled "+" facing up (see Figure 39).

Figure 39. Battery Replacement

Replace the system cover.
Reconnect the system to the electrical outlet, and turn on the system power.
Enter the System Setup program to confirm that the battery is operating properly.
Enter the correct time and date through the System Setup program's Time and Date settings.

Also reenter any system configuration information that is no longer displayed on the System Setup screens, and then exit the System Setup program.
To test the newly installed battery, power down and disconnect the system from the electrical source for at least an hour.
Close the bezel.
After an hour, connect the system to an electrical source and turn on the power.
Enter the System Setup program and if the time and date are still incorrect, replace the system board.

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