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Removing and Replacing Parts: Dell PowerEdge 1550 and PowerApp 120 Systems
Service Manual
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Removing and Replacing Parts: Dell™ PowerEdge™ 1550 and
PowerApp™ 120 Systems Service Manual
This section provides servicing procedures for components inside the system. Before you
start any of the procedures in this section, perform the following tasks:
You need the following items to perform the procedures in this section:
- The Dell Diagnostics diskette set appropriate for your system
- Formatted blank 3.5-inch diskette
- System User's Guide
- System Installation and Troubleshooting Guide
- Key to the system keylock
- #1 and #2 Phillips screwdriver
- Wrist grounding strap
To remove the optional front bezel of the system, perform the following steps.
- Use the system key to unlock the bezel.
- Press the tab on the right side of the bezel and rotate the bezel outward and to the
left to release the bezel from the chassis (see Figure 1).
Figure 1. Optional Front
Bezel Removal
 |
| 1 |
Locking lever |
| 2 |
Tab |
| 3 |
Keylock |
|
|
|
The system has a sliding top cover that provides access to the system board and
expansion cards. When the system is pulled from the rack for servicing, the top cover
remains in the rack.
Figure 2. Removing the System Top Cover
 |
| 1 |
Cover |
| 2 |
Thumbscrews (2) |
| 3 |
Release button access hole |
|
|
|
The cover is attached to the rack using an integrated rail between the cover and the main chassis. To remove the system from the rack and the top cover, perform the following steps.
 |
CAUTION: See "Safety Instructions" before working inside your system. Also
observe the safety instructions in your System Information booklet. |
- 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.
- Remove the optional front bezel (if present) if you need to access
the hard-disk drives.
- Loosen the two captive thumbscrews that secure the front panel to the rack.
- Pull the system out of the rack until it locks in its fully-extended service position.
If it is necessary to completely remove the system from the rack, continue with the next
two steps.
- Push in on each slide's release spring (located just in front of the top cover's mounting flange on both sides) while pulling on the system chassis.
The system chassis pulls free of the top cover's inner slide channel.
- Place the system chassis on a smooth, antistatic work surface.
To install the system into its top cover and the rack, perform the following steps:
- Orient the system chassis with the slides extended so that the slides are aligned with
the mating sides of the top cover assembly in the rack cabinet.
- Slide the system chassis inward until the locks on
each side snap to engage the system in the service position.
- Push in on each slide's release spring (located just in front of the top cover's
mounting flange on both sides) while sliding the system the rest of the way into the rack.
- Secure the front panel to the rack vertical rails with the front panel thumbscrews.
- Install the bezel, if present, and lock the bezel in place with the system key (see Figure 1).
- Install the AC power and peripheral cables to the back of the system chassis.
- Turn on the AC power to the system.
The system will take a few minutes to boot.
In Figure 3, the system cover is opened to provide an interior view.
Refer to this illustration to locate interior features and components discussed later in
this manual.
Figure 3. Inside the System (Right-Side View)
 |
| 1 |
Hard-disk drive bays (3) |
| 2 |
Cooling fans (4) |
| 3 |
Memory modules (4) |
| 4 |
Microprocessors (2) |
| 5 |
Power supply |
| 6 |
Expansion cards |
| 7 |
Riser board |
| 8 |
Battery |
| 9 |
System board |
| 10 |
SCSI backplane |
| 11 |
Control panel |
| 12 |
CD-ROM drive |
| 13 |
Diskette drive |
|
The system board 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. Using a riser board, the system board can
accommodate up to two PCI expansion cards (one full-length and one short, or two short).
The two peripheral bays provide space for a 3.5-inch diskette drive and a CD-ROM
drive.
The hard-disk drive bays provide space for up to three 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 expansion card, via the SCSI backplane card.
The power cables 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, Switches, and Connectors."
In Figure 4, the control panel tray is removed from the system chassis.
Figure 4. Control Panel
Assembly Removal
 |
| 1 |
Control panel release latch |
| 2 |
Control panel tray |
|
To remove the control panel assembly, perform the following steps.
|
CAUTION: Read the safety instructions
in your System Information document. |
- Remove the optional 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 from the rack and open the top cover.
- Pull each hard-disk drive carrier partially out of its slot, approximately 2 inches.
- Lift up on the latch at the bottom front of the control panel tray,
and pull it out of its slot approximately 3 inches.
- Disconnect the ribbon cable from the control panel board.
- Disconnect the cable connector leading to the chassis intrusion
switch.
- Loosen the thumbscrew securing the control panel board.
- Slide the control panel board back and lift it out of the control
panel tray.
Figure 5. Chassis Intrusion Switch Removal
 |
| 1 |
Switch actuator |
| 2 |
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 optional 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 from the rack and open the top cover.
- Remove the control panel assembly.
- Slide the chassis intrusion switch out of its slot.
Figure 6 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 6. Drive Hardware
 |
| 1 |
System board |
| 2 |
SCSI backplane board |
| 3 |
IDE CD-ROM drive |
| 4 |
3.5-inch diskette-drive |
| 5 |
SCSI hard-disk drives (3 slots) |
|
The chassis provides one bay for a 3.5-inch diskette drive and a bay for a CD-ROM drive assembly.
CD-ROM Drive Removal
Figure 7. CD-ROM Drive Removal
 |
| 1 |
IDE CD-ROM drive |
| 2 |
IDE CD-ROM interface cable |
| 3 |
CD-ROM drive release latch |
|
To remove the CD-ROM drive, perform the following steps.
- Remove the front bezel, if one is attached.
|
NOTE: The next step may not
be necessary if the system is mounted in the lower portion of the rack. |
- Remove the system from the rack and open the top cover.
- Turn off and disconnect the AC power and peripheral cables.
- Disconnect the CD-ROM drive interface cable from the top of the SCSI
backplane board (see Figure 7).
- Press the CD-ROM drive latch to the left (as viewed from the front of
the system) while pulling the CD-ROM drive out the front of its slot (see Figure 7).
|
NOTE: When you reinstall
a replacement CD-ROM drive, ensure the drive has the identical part number of the CD-ROM
drive you removed. |
Diskette Drive Removal
To remove the integrated 3.5-inch diskette drive, perform
the following steps:
- Remove the front bezel, if one is attached.
|
NOTE: The next step
may not be necessary if the system is mounted in the lower portion of the rack. |
- If the system is installed in the upper portion of the reack, remove the system from the rack and the top cover .
If the system is installed in the lower portion of the rack, loosen the front
panel thumbscrews and extend the system chassis out of the rack and the top
cover to its farthest position.
- Disconnect the diskette drive interface cable from the connector on the top of the SCSI backplane board by lifting each end of the connector top.
- Press the drive release latch to the left approximately 12.5 mm (0.5 inch) (as viewed from the front) while pulling the diskette drive out of its slot (see Figure 8).
|
NOTES:
If your replacement diskette drive does not come with a rail, skip to
step6.
If your replacement diskette drive does not come with an interface cable,
skip to step 7. |
- If your replacement diskette drive comes with
a rail and interface cable installed, slide the replacement drive completely
into its slot before securing the interface cable to its connector on the
SCSI backplane board (see Figure 8).
Figure 8. 3.5-inch
Diskette Drive Removal
 |
| 1 |
Diskette drive |
| 2 |
Drive release latch |
| 3 |
Diskette drive interface cable |
|
- If your replacement diskette drive comes without a rail attached to its
left side, remove the rail from the faulty diskette drive by performing the following
steps:
- Remove the two screws securing the rail to the left side
of the faulty diskette drive.
- Position the rail on the left side of the replacement diskette drive.
The rail's larger bent end must be at the back of the diskette drive (see Figure 9).
- Secure the rail with the screws you removed in step a.
- If your replacement diskette drive comes without an
interface cable, remove the interface cable from the faulty diskette drive
and install it on the replacement drive.
- Slide the replacement drive into its slot
until the drive release latch clicks.
- Attach the interface cable to its connector on
the SCSI backplane board.
Figure 9. Rail
Removal From Diskette Drive
 |
| 1 |
Screw (2) |
| 2 |
Rail |
| 3 |
Diskette drive |
|
Each SCSI hard-disk drive is mounted in a hard-disk drive
carrier. The front bezel must be removed from the system front panel before you remove a
drive carrier.
NOTICE: Hot-pluggable hard-disk drives are only supported if an approved RAID Controller PCI
adapter and appropriate software is installed.
If an approved optional RAID controller PCI card and
software are installed, hot-pluggable drives might be individually shut down and replaced
while the system is running.
To remove a hard-disk drive and its carrier, perform the
following steps.
NOTICE: See "Protecting
Against Electrostatic Discharge."
- If the system does not have an approved RAID controller
installed, shut down the system and disconnect the cables (see "Protecting Against Electrostatic Discharge").
- If the optional bezel
is installed, remove it.
- 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 10).
Figure
10. Hard-Disk Drive and Carrier Removal
 |
| 1 |
Hard-disk drive |
| 2 |
Hard-disk drive carrier |
|
- 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 11).
- Remove the hard-disk drive from the carrier.
Figure 11. 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. Close the handle until it engages the front panel, locking the drive in
place.
- If you removed the front
bezel in step 2 of the previous procedure, reinstall it now.
- 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.
The SCSI backplane board has connectors on the bottom that connect to the three
hard-disk drives and to the system board SCSI connectors or to an expansion card
connector. A DC power connector accepts a power cable from the power supply.
Figure 12. SCSI
Backplane
 |
| 1 |
Thumbscrew |
| 2 |
SCSI backplane board |
| 3 |
Power connector (POWER2) |
| 4 |
Control panel connector |
| 5 |
CD-ROM interface and power connector |
| 6 |
Diskette drive interface and power connector |
| 7 |
SCSI connector to hard-disk drive (3) |
|
To remove a SCSI backplane board, perform the following steps.
NOTICE: See "Protecting
Against Electrostatic Discharge."
- Remove the optional 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 from the rack and the top cover.
- Pull each hard-disk drive carrier partially out of its slot,
approximately 5 cm ( 2 inches)
- Gently loosen the diskette drive interface ribbon cable from its slot (see Figure 8).
- Remove the CD-ROM interface ribbon cable from its slot (see Figure 7).
- Loosen the two thumbscrews securing the SCSI backplane to the chassis.
Move the SCSI backplane board back about 12.7 millimeters
(0.5 inch), and then lift the SCSI backplane board up and off of the L-shaped mounting
tabs on the system chassis.
Disconnect two system board cables attached to the SCSI backplane
board (see Figure 13).
Disconnect the DC power connector (POWER2) from its power
input connector on the backplane board.
Figure
13. SCSI Backplane Connectors to System Board
 |
| 1 |
SCSIA Ultra3 SCSI cable to system board (SCSI) |
| 2 |
SCSI interface cable connector |
| 3 |
BACKPLANE cable connector (J11) |
| 4 |
J11 cable to system board (BACKPLANE) |
|
When installing a replacement SCSI backplane board, see Figure 12 and Figure 13 for cable connections.
Four cooling fans are installed in the center of the system chassis. (Fan 1 is the
leftmost fan in the left fan assembly, as viewed from the front.) 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 assembly (two fans in a
frame).
NOTICE: See "Protecting Against Electrostatic Discharge."
- Turn off the system, including any attached peripherals, and
disconnect the AC power cable from its power source.
|
NOTE: The next step
may not be necessary if the system is mounted in the lower portion of the rack. If this is
so, pull the system chassis out approximately 15 cm (six inches). |
- Remove the system from the rack and the top cover.
- Disconnect the cooling fan power cable from the system board by pressing the release tab
on the power cable connector.
- Press the retention tab on the floor of the chassis and slide the fan assembly out of
the slots that secure it and lift it out of the system chassis.
- To replace an individual fan, perform the following steps:
- Press the shorter locking tabs at opposing corners of the fan assembly.
- Remove the faulty fan from the fan assembly and disconnect it's fan power cable
(see Figure 14).
Figure 14. Fan Assembly Removal
 |
| 1 |
Cooling fans (4) |
| 2 |
Release tab |
|
- Install a new fan in the assembly and connect it to the system board
fan connector.
Ensure that the replacement fan is oriented the same way as the original fan (label on the
fan facing the back of the system chassis).
- Slide
the fan assembly into three slots in the SCSI backplane bulkhead and press against the
base of the fan assembly until the retention tabs in the floor snap into place.
- When
reinstalling the fan assembly, be careful to avoid pinching the system interface cables.
- Push the system back into the rack and the top cover, and then reconnect the system to AC power.
- Turn on the system.
The system contains a single power supply.
Figure 15. Power Supply
Removal
 |
| 1 |
Thumbscrew |
| 2 |
Power supply |
|
To remove a power supply, perform the following steps.
NOTICE: See "Protecting Against Electrostatic Discharge."
|
CAUTION: Avoid
touching the cable connectors on the power supply. Wait 10 to 20 seconds after
disconnecting the AC 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.
- Unplug the AC power cord from the power supply.
|
NOTE: The next step may not
be necessary if the system is mounted in the lower portion of the rack. |
- Remove the system from the rack and from the top cover.
- Pull each hard-disk drive carrier partially out of its slot, approximately 5 cm ( 2
inches)
- On the top of the SCSI backplane board, disconnect the CD-ROM and 3.5-inch diskette
drive interface cables.
- Loosen the two thumbscrews securing the SCSI backplane to the chassis.
- Slide the SCSI backplane towards the front of the system and gently lift about 12.7 mm
(0.5-inch) to gain access to the connectors on the bottom of the SCSI backplane board.
- Disconnect the power cable from the system board.
- Disconnect the power cable from the bottom of the SCSI backplane board.
- Remove the power supply:
- The power supply is secured by a thumbscrew located at the front of the power supply and
three tabs which are located under the power supply.
- Loosen the thumbscrew securing the power supply to the chassis (see Figure 16).
- Slide the power supply forward and lift the power supply straight up to clear the chassis.
To replace a power supply, perform the following steps:
- Lower the new power supply into the chassis.
Ensure that the power supply is properly seated into its slot in the chassis.
- Slide the power supply back to engage the locking tabs.
- Tighten the thumbscrew securing the power supply to the chassis (see Figure 16).
- Connect the DC power cables to the system board and the SCSI backplane board.
- Gently lower the SCSI backplane board into the chassis and slide it toward the back of
the system.
- Tighten the two thumbscrews to secure the SCSI backplane board to the chassis.
- Install the interface cables for the CD-ROM drive and the 3.5-inch diskette drive.
- Reinstall the hard-disk drives into their slots and lock them in place with their
latching levers.
- Replace the system in the rack and the top cover.
- Connect the AC power cable to the new power supply and route the cable through the
strain-relief clip on the back panel
- Connect the free end of the AC power cable to an electrical
outlet.
- Observe the front panel of the system to verify that the
green power indicator light-emitting diode (LED) is lit and that the red failure LED is
off.
Figure 16. System Board Removal
 |
| 1 |
System board |
| 2 |
Thumbscrew |
|
To remove the system board, perform the following steps.
NOTICE: See "Protecting Against Electrostatic Discharge."
- Turn off the system, including any attached peripherals, and disconnect the system from
its electrical outlet.
|
NOTE: The next step may not
be necessary if the system is mounted in the lower portion of the rack. |
- Remove the system from the rack and open the top cover.
- Remove all external peripheral cables from their connectors at the back of the system.
- Record the locations and remove all internal cables (including power cables) attached to
the system board.
- Remove the expansion cards and
the riser board.
- Unscrew the thumbscrew securing the system board to the chassis floor.
- Slide the system board toward the front of the bracket about 6.3 mm (1/4 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 (or
microprocessor and terminator
module).
- Remove the DIMMs.
To replace the system board, perform the following steps:
- Install the system board into the chassis.
- Install the DIMMs.
- Install the microprocessors (or microprocessor and terminator module).
- Check to ensure the system board jumpers and switches are set to the same settings as
the board you removed.
- Install the expansion
cards and the riser card.
- Connect all internal power and signal interface cables
- Slide the system chassis into the top cover.
- Connect the AC power to the system, connect peripheral cables, and turn the system on.
Figure 17 defines the system board features. Use this figure when replacing your system
board or components that attach to the system board.
Figure 17. System Board Features
 |
1 |
External SCSI connector |
2 |
Serial port connector (COM1) |
3 |
Video connector |
4 |
USB connector (2) |
5 |
RJ45 NIC connectors (2) |
6 |
Mouse connector |
7 |
Keyboard connector |
8 |
PCI2 connector (with a riser board) |
9 |
PCI1 connector |
| 10 |
Battery connector (BATTERY) |
11 |
SCSI connector |
12 |
Configuration jumpers |
13 |
Backplane interface connector |
14 |
Power input connector (POWER) |
15 |
Primary microprocessor (PROCESSOR 1) |
16 |
Secondary microprocessor (PROCESSOR 2) |
17 |
Thumbscrew |
18 |
Memory module sockets (BANK1_DIMM_A to BANK2_DIMM_B) |
| 19 |
Riser board |
|
The system has one fixed expansion-card socket and one removable expansion-card riser,
which simplifies many installation procedures by allowing the user to remove the riser
board and its installed expansion card in a single step.
To remove the expansion-card riser board and its installed expansion card, perform the
following steps.
NOTICE: See "Protecting Against Electrostatic Discharge."
|
NOTE: The first step may not
be necessary if the system is mounted in the lower portion of the rack. |
- Loosen the front panel thumbscrews and pull the system chassis out of the system cover and the rack cabinet.
- Label and disconnect any cables connected to the expansion card through the back-panel opening.
Figure 18. Riser Board Removal
 |
| 1 |
PCI2 expansion connector |
| 2 |
Riser board |
|
- Lift the riser board up and away from the chassis.
To replace the riser board, perform the following steps:
- Lower the riser board into place into the riser board connector on the system board.
- Make sure the riser board is fully seated in the PCI2 connector on the system board.
The riser board contains a single 64-bit, 66-MHz PCI
expansion-card connector. Connector PCI1 supports a second single short expansion card in
its fixed socket on the system board.
Figure 19. Expansion Card
Replacement
 |
| 1 |
Riser board in PCI2 socket |
| 2 |
Expansion card |
|
To install a replacement expansion card, perform the following steps.
| NOTICE: Full-length PCI cards
can only be installed in PCI2 slot via the riser board. When a full-length card is in this
slot, a secondary microprocessor cannot occupy the PROCESSOR2 socket. A terminator module
must occupy the PROCESSOR2 socket. |
NOTICE: See "Protecting Against Electrostatic Discharge."
|
NOTE: The first step may not
be necessary if the system is mounted in the lower portion of the rack. |
- Remove the system chassis from its top cover in the rack.
- 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.
- Select the expansion slot in which you will install the new expansion card.
- To release an expansion-card's back-panel bracket, unscrew the thumbscrew and rotate the
latch away from the expansion-card bracket.
- To install the card, insert the card-edge connector firmly into the expansion-card
connector on the chassis.
- When the card is firmly seated in the connector and the card-mounting bracket is aligned
with the brackets on either side of it, close the expansion-card latch and tighten the
thumbscrew.
- If the expansion card is a full-length card, secure the inner end of the card by closing
the plastic latch on the card guide over the top edge of the card.
- Connect any cables that should be attached to the card.
See the documentation that came with the card for information about cable connections.
- Install the expansion-card.
- Slide the system into the rack and the top cover, and then reconnect the system and peripherals to their AC power sources and turn them on.
The four memory module sockets (DIMM sockets) on the system board can accommodate 128
MB to 2 GB or higher (when supported) of registered SDRAM. The DIMM sockets are located
near the left edge of the system board, as viewed from the front (see Figure 17 to locate the DIMM sockets on the system board).
System Memory Upgrade Kits
The system is upgradable to 2 GB or higher (when supported) by installing combinations of 64-, 128-, 256-, and 512-MB registered DIMMs. You can purchase memory upgrade kits from Dell as needed.
|
NOTE: The DIMMs must be rated to run at 133 MHz or faster. |
DIMM Installation Guidelines
The four DIMM sockets are labeled "BANK1_DIMM_A" through
"BANK2_DIMM_B" (see Figure 20). When you install DIMMs, follow these guidelines:
- Install a DIMM in socket BANK1_DIMM_A before socket BANK1_DIMM_B and socket BANK2_DIMM_A
before socket BANK2_DIMM_B.
- You must install DIMMs in matched pairs. Each pair uses alternating sockets (see Figure 20).
Figure 20. DIMM Socket Locations
 |
| 1 |
BANK1_DIMM_A |
| 2 |
BANK2_DIMM_A |
| 3 |
BANK1_DIMM_B |
| 4 |
BANK2_DIMM_B |
|
Table 2 illustrates several sample memory configurations based on
these guidelines.
Table 2. Sample DIMM Configurations
| |
DIMM Sockets |
Total Desired
Memory |
BANK1
DIMM_A |
BANK1
DIMM_B |
BANK2
DIMM_A |
BANK2
DIMM_B |
| 128 MB |
64 MB |
64 MB |
None |
None |
| 256 MB |
64 MB |
64 MB |
64 MB |
64 MB |
| 256 MB |
128 MB |
128 MB |
None |
None |
| 512 MB |
128 MB |
128 MB |
128 MB |
128 MB |
| 512 MB |
256 MB |
256 MB |
None |
None |
| 1 GB |
256 MB |
256 MB |
256 MB |
256 MB |
| 2 GB |
512 MB |
512 MB |
512 MB |
512 MB |
To perform a memory upgrade to the system board, perform the following steps.
NOTICE: See "Protecting Against Electrostatic Discharge."
- Turn off the system, including any attached peripherals, and
disconnect the AC power cable from its power source.
- Remove the front bezel, if one is
attached.
|
NOTE: The next step may not
be necessary if the system is mounted in the lower portion of the rack. You need only pull
the system chassis out far enough to access the DIMM sockets. |
- Remove the system from the rack and the top cover.
- Locate the DIMM sockets into which you will install or replace DIMMs.
Figure 20 shows the
relative location of the DIMM sockets on the system board and shows the order of the
sockets.
- Install or replace the DIMMs as necessary to reach the desired memory total.
- Replace the system into the rack and the system top cover.
- Replace the optional front bezel
(if one is present), 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
following error message appears:
The amount of system memory has changed.
- 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 8.
Carefully examine each DIMM to ensure proper seating in its socket.
|
NOTE: If the memory
total is incorrect, turn off and disconnect the system and peripherals from their AC power
sources, open the system doors, and check all the installed DIMMs to make sure they are
seated properly in their sockets. Ensure that the installed DIMMs conform to one of the
configurations listed in Table 2.
|
- Run the System Setup. Save the configuration and exit.
Running the System Setup and saving the configuration is required for the system to
recognize the newly installed DIMM(s). See Using the System Setup for instructions on running the utility and
saving the configuration.
- Run the system memory test in the Dell Diagnostics.
To install a DIMM, perform the following steps.
NOTICE: See "Protecting Against Electrostatic Discharge."
- Turn off the system, including any attached peripherals, and disconnect the AC power
cable from its power source.
- Remove 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 from the rack and the top cover.
- Disconnect the AC power cable and all peripheral cables from the back panel of the
system.
- Locate the DIMM sockets in which you will install or replace DIMMs.
Figure 20 shows
the relative location of the DIMM sockets on the system board and shows the labeling of
the DIMM sockets.
- Press down and outward on the ejectors on the DIMM socket, as shown in Figure 21,
to allow the DIMM to be inserted into the socket.
Figure 21. DIMM
Installation
 |
| 1 |
DIMM socket ejectors (2) |
| 2 |
Alignment keys (2) |
|
- Align the DIMM's edge connector with the slot in the center of the
DIMM socket, and insert the DIMM in the socket (see Figure 20).
The DIMM socket has two alignment keys that allow the DIMM to be installed in the socket
in only one way.
- Press down on the DIMM with your thumbs while pulling up on the
ejectors with your index fingers to lock the DIMM into the socket (see Figure 21). When the DIMM is properly seated in the
socket, the ejectors on the DIMM socket should align with the ejectors on the other
sockets with DIMMs installed.
- Repeat steps 7 and 8 to install the remaining DIMMs.
To remove a DIMM, press down and outward on the ejectors on each end of the socket
until the DIMM pops out of the socket (see Figure 22).
|
NOTES: This procedure
assumes the power is off and you have access to the DIMM slots. See steps 1 through 6
of the "DIMM Installation" procedure for these preliminary steps.
If you encounter difficulty in moving the ejector nearest to the chassis wall, press down
on the opposite ejector and lift that end of the DIMM slightly to free the DIMM from its
socket. |
Figure 22. DIMM
Removal
 |
| 1 |
Alignment keys (2) |
| 2 |
DIMM socket ejectors (2) |
|
The system board has two zero-insertion- force (ZIF) sockets which hold microprocessors
and heat-sink assemblies. If your system has only one microprocessor, the secondary
ZIF socket must contain a terminator module. 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 866-MHz primary microprocessor, your secondary microprocessor must
also be a 866-MHz microprocessor.
NOTICE: If you are upgrading a system by installing
a secondary microprocessor, you must order an upgrade kit from Dell. The upgrade kit from
Dell contains the correct version of the microprocessor for use as a secondary
microprocessor.
|
CAUTION: Read the
safety instructions in your System Information document. |
To remove a terminator module, perform the following steps.
NOTICE: See " Protecting
Against Electrostatic Discharge."
- Turn off the system, including any attached peripherals, and disconnect the AC power
cable from its power source.
- Remove the front bezel, if one is
attached.
|
NOTE: The next step may not
be necessary if the system is mounted in the lower portion of the rack. You need only pull
the system chassis out far enough to access the PROCESSOR sockets. |
- Remove the system from the rack and the system top cover.
- Locate the ZIF socket containing the terminator module and lift the ZIF socket release lever.
- Lift the terminator module up and out of the ZIF socket (see Figure 23).
Figure 23. Terminator Module Removal
 |
| 1 |
Terminator module |
| 2 |
ZIF socket |
| 3 |
ZIF socket release lever |
|
Installing a Terminator Module
- Gently place the terminator module into the ZIF socket so that the terminator module
pins mate exactly with the ZIF socket.
Make sure that pin 1 of the terminator module is oriented correctly in the socket.
NOTICE: Do not force the terminator module into the socket. Even slight pressure can bend the terminator module pins.
- Swing the ZIF socket release lever down until it snaps into the socket tab after the
terminator module is in place.
- Replace the system into the rack and the top cover.
- Replace the optional front bezel
(if one is present), reconnect the system to the electrical outlet, and turn on the
system.
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. |
NOTICE: See "Protecting Against Electrostatic Discharge."
- Turn off the system, including any attached peripherals, and disconnect the AC power
cable from its power source.
- Remove the front bezel, if one is
attached.
|
NOTE: The next step may not
be necessary if the system is mounted in the lower portion of the rack. You need only pull
the system chassis out far enough to access the PROCESSOR sockets. |
- Remove the system from the rack and the system top cover.
- Locate the microprocessor ZIF sockets into which you will install or replace a
microprocessor and heat sink assembly.
- Release the clip securing the heat sink to the microprocessor socket by pressing on the
heat sink clip tab, and then releasing the clip from the opposite side of the socket (see
Figure 23).
- Grasp the end of the ZIF socket release lever and bend it out slightly until it
disengages from the socket tab.
- Swing the ZIF arm up to the upright position.
The microprocessor and heat sink are now unlocked from the ZIF socket.
- Lift the microprocessor and heat sink away from the ZIF socket.
Figure 24. Microprocessor and Heat Sink Removal
 |
| 1 |
Clip |
| 2 |
Heat-sink assembly |
| 3 |
Microprocessor |
| 4 |
Socket |
|
Microprocessor and Heat-Sink Assembly Replacement
To install the replacement microprocessor and heat sink assembly, see Figure 24 and perform the following steps:
- Turn off the system, including any attached peripherals, and disconnect the AC power
cable from its power source.
- Remove the front bezel, if one is
attached.
|
NOTE: The next step may not
be necessary if the system is mounted in the lower portion of the rack. You need only pull
the system chassis out far enough to access the PROCESSOR sockets. |
- Remove the system from the rack and the system top cover.
- Locate the microprocessor ZIF sockets into which you will install an additional or
replacement microprocessor and heat sink assembly.
- Grasp the end of the ZIF socket release lever and bend it out slightly until it
disengages from the socket tab.
- Swing the ZIF arm up to the upright position.
The terminator module or microprocessor and heat sink are now unlocked from the ZIF
socket.
- Lift the terminator module or microprocessor and heat sink away from 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.
Make sure that pin 1 of the microprocessor is oriented correctly in the socket.
NOTICE: Do not force the terminator module into the socket. Even slight pressure can bend the terminator module pins.
- Swing the ZIF socket release lever down until it snaps into the socket tab after the
microprocessor is in place.
- Place the heat sink on the microprocessor.
The beveled surface on the heat sink covers the part of the ZIF socket that is not covered
by the microprocessor.
- Drop the heat sink clip into the heat sink's center groove with the end of the clip that
has two slots facing the front of the ZIF socket.
- Gently hold the heat sink in place as you press down firmly on the shorter end of the
heat sink clip (the end that has a single slot) until that end snaps into its tab on the
back of the ZIF socket (see Figure 24).
- Use your thumb to press down on the front end of the heat sink clip (the end that has
two slots) until it snaps into the socket tab.
- Replace the system in the rack and close the top cover.
- Replace the optional front bezel
(if one is present), and reconnect the system to the electrical outlet, connect any
peripheral cables you disconnected, and turn on the system.
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
or
System CMOS checksum bad -- Run SETUP
Strike the F1 key to continue, F2 to run the setup utility
or
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 the system for a few hours, and then turn it 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.
|
CAUTION: 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.
NOTICE: See "Protecting
Against Electrostatic Discharge."
- Remove the front bezel, if one is attached.
|
NOTE: The next step may not
be necessary if the system is mounted in the lower portion of the rack. |
- Remove the system from the rack and the system top cover.
- Remove the battery.
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 25).
Figure 25. Battery Replacement
- Replace the system in the rack and close the system top
cover.
- Replace the optional front bezel (if one is present), and reconnect
the system to the electrical outlet, and turn on the system.
After the system completes the POST routine, it runs a memory test that displays the new
memory total, which includes all newly installed memory.
- 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.
- Turn off the system and peripherals, and leave them off for at least an hour.
- After an hour, turn on the system and enter the System Setup program. If the time and date are still incorrect, replace the system board.
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