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Dell™ PowerEdge™ 2500 Systems Installation and Troubleshooting Guide
This section describes how to install the following options:
- Expansion cards
- Memory upgrades
- Microprocessor upgrades
- Integrated RAID controller
This section also includes instructions for replacing the fan assemblies, cooling shroud, power supplies, RAID battery, and system battery, if necessary.
Use Figure 6-1 to locate the system board features. Table 6-1 describes the system board connectors and sockets.
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WARNING: Before you perform this procedure, you must turn off the system and disconnect it from its power source. For more information, see "Safety First— For You and Your System" in "Troubleshooting Your System." |
Figure 6-1. System Board Features
Table 6-1. System Board Connectors and Sockets
Connector or Socket |
Description |
SCSI BACKPLANE |
Hot-pluggable SCSI backplane board interface cable connector |
RAID BAT |
RAID battery connector |
BATTERY |
System battery connector |
COMn |
Serial port connectors; sometimes referred to as COM1 and COM2 |
DIMM_x |
Memory module sockets (A–F) |
DIMM_RAID |
Memory module socket for integrated RAID controller |
ENET |
Ethernet connector |
REAR FAN |
Power for the rear fan assembly |
FLOPPY/IDE |
Power and data to the diskette/CD ROM interposer board from the system board |
INTR |
Intrusion-alarm switch connectors |
KYBD |
Keyboard connector |
MOUSE |
Mouse connector |
FRONT PANEL |
System control panel connector |
PARALLEL |
Parallel port connector; sometimes referred to as LPT1 |
POWERn |
Power connector |
PROCESSOR_n |
Microprocessor sockets |
PROCESSOR_n VRM |
Voltage regulator module connector |
RAID_KEY |
Socket for integrated RAID controller hardware key |
SLOT_n |
Expansion card connectors (SLOT_1—SLOT_7) |
SCSIA, SCSIB |
Ultra160/m SCSI host adapter connectors |
USBn |
USB connector |
VGA |
Video connector |
NOTE: For the full name of an abbreviation or acronym used in this table, see "Abbreviations and Acronyms ." |
There are two fan assemblies containing two individual fans. One assembly is located near the SCSI backplane board. The other fan assembly is attached to the back-panel.
- Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
- Remove the system cover.
- Release the fan assembly by pressing the release lever (see Figure 6-2).
Figure 6-2. Removing the Front Fan Assembly
- Swing the fan assembly up and out of the way.
- Disconnect the fan assembly power cable from the front fan connector on the SCSI backplane board (see Figure A-3).
- Connect the fan assembly power cable to the front fan connector on the SCSI backplane board (see Figure A-3).
- Place the fan assembly in the hinge bracket and swing the fan assembly down until the release lever snaps into place.
- Replace the system cover.
- Close the front bezel.
- Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
- Remove the system cover.
- Remove the cooling shroud (see "Removing the Cooling Shroud").
- Press the release latch and lift the fan assembly straight up to clear the chassis (see Figure 6-3).
Figure 6-3. Removing the Back Fan Assembly
- Disconnect the fan assembly power cable from the fan connector (REAR FAN) on the system board (see Figure 6-1).
- Connect the fan assembly power cable to the fan connector (REAR FAN) on the system board (see Figure 6-1).
- Align the fan assembly with the fan assembly guide on the back-panel, and push down until the fan assembly is firmly seated and the latch is engaged (see Figure 6-3).
- Install the cooling shroud (see "Installing the Cooling Shroud").
- Replace the system cover.
- Close the front bezel.
There are four fans contained in two fan assemblies. The procedure for removing and replacing the four fans are the same.
To remove a fan:
- Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
- Remove the system cover.
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CAUTION: The cooling fans are hot-pluggable. To maintain proper cooling while the system is on, only replace one fan at a time. |
- Locate the faulty fan and while pressing the fan release lever, lift the fan straight up to clear the fan assembly (see Figure 6-4).
Figure 6-4. Removing/Replacing a Fan
To replace a fan:
- Lower the fan into the fan assembly until the fan snaps into position.
- Replace the system cover.
- Close the front bezel.
Expansion cards are installed on the system board (see Figure 6-1). There are seven expansion card slots available.
The front fan assembly bracket is used to help secure the expansion cards.
To install an expansion card, perform the following steps.
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WARNING: Before you perform this procedure, you must turn off the system and disconnect it from its power source. For more information, see "Safety First— For You and Your System" in "Troubleshooting Your System." |
- Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet.
- Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
- Remove the system cover.
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CAUTION: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document. |
See the documentation that came with the expansion card for information on configuring the card, making internal connections, or otherwise customizing the card for your system.
- Remove the front fan assembly (see "Removing the Front Fan Assembly").
- Release the expansion-card latch, and remove the filler bracket from the expansion slot (see Figure 6-5).
- Install the new expansion card (see Figure 6-5).
- Position the expansion-card so that the board-edge connector 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.
Figure 6-5. Installing an Expansion Card
- When the card is seated in the connector and the card-mounting bracket is aligned with the brackets on either side of it, close the expansion-card latch.
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NOTE: SCSI cables connected from an expansion card to the SCSI backplane board should be routed under the front fan assembly. |
- Connect any cables that should be attached to the card.
See the documentation that came with the card for information about its cable connections.
- Replace the front fan assembly (see "Replacing the Front Fan Assembly").
- Replace the system cover, and then reconnect the system and peripherals to their power sources and turn on the system.
- Close the front bezel.
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WARNING: Before you perform this procedure, you must turn off the system and disconnect it from its power source. For more information, see "Safety First— For You and Your System" in "Troubleshooting Your System." |
- Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet.
- Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
- Remove the system cover.
- Remove the front fan assembly (see "Removing the Front Fan Assembly").
- Disconnect any cables connected to the card.
- To release the expansion card from the system, rotate the latch away from the expansion-card bracket (see Figure 6-5).
- Grasp the expansion card by its top corners, and carefully remove it from the expansion-card connector.
- If you are removing the card permanently, install a metal filler bracket over the empty card-slot opening.
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NOTE: Installing a filler bracket over an empty expansion slot is necessary to maintain Federal Communications Commission (FCC) certification of the system. The brackets also keep dust and dirt out of the system and aid in proper cooling and airflow inside the system. |
- Replace the front fan assembly (see "Replacing the Front Fan Assembly").
- Replace the system cover, and then reconnect the system and peripherals to their power sources and turn on the system.
- Close the front bezel.
- Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
- Remove the system cover.
- Loosen the two thumbscrews securing the cooling shroud to the system (see Figure 6-6).
Figure 6-6. Removing and Installing the Cooling Shroud
- Rotate the cooling shroud up and lift to clear the rear cooling fan assembly and chassis (see Figure 6-7).
Figure 6-7. Rotating the Cooling Shroud
- Lower the cooling shroud into the chassis ensuring that the cooling shroud is aligned with the rear cooling fan assembly guides.
- Rotate the cooling shroud down ensuring the thumbscrews are aligned with the connecting posts on the system board (see Figure 6-6).
- Tighten the two thumbscrews securing the cooling shroud to the system board.
- Replace the system cover.
- Close the front bezel.
- Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
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CAUTION: The power supplies are hot-pluggable. The system requires two power supplies to be installed for the system to operate normally. The system is in the redundant mode when all three power supplies are installed. Remove and replace
only one power supply at a time. |
- 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 6-8).
Figure 6-8. Removing and Installing the Power Supply
- Install the power supply by sliding the new power supply into the chassis until it snaps into place.
- Close the front bezel.
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 6-1), next to the cooling fan assembly.
The system is upgradable 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 maximum memory has been exceeded, see "Indicators, Messages, and Codes," for detailed information. You can purchase memory upgrade kits from Dell as needed.
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NOTE: The memory modules must be PC-133 compliant. |
Starting with the socket nearest the fans, the memory module sockets are labeled "DIMM_A" through "DIMM_F" (see Figure 6-9). When you install memory modules, follow these guidelines:
- You must install memory modules in matched pairs.
- 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 6-9. Memory Module Sockets
Table 6-2 illustrates several sample memory configurations based on these guidelines.
Table 6-2. Sample Memory Module 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 |
256 MB |
256 MB |
None |
None |
None |
None |
512 MB |
128 MB |
128 MB |
128 MB |
128 MB |
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 |
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WARNING: Before you perform this procedure, you must turn off the system and disconnect it from its power source. For more information, see "Safety First— For You and Your System" in "Troubleshooting Your System." |
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CAUTION: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document. |
- Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
- Remove the system cover.
- Remove the cooling shroud (see "Removing the Cooling Shroud").
- Locate the memory module sockets in which you will install or replace memory module pairs. Figure 6-9 shows the order of the memory module sockets.
- Install or replace the memory module pairs as necessary to reach the desired memory total (see "Installing Memory Modules" or "Removing Memory Modules").
- Install the cooling shroud (see "Installing the Cooling Shroud").
- Replace the system cover, reconnect the system to the electrical outlet, and turn on system. After the system completes the POST routine, it runs a memory test.
The system detects that the new memory does not match the system configuration information, which is stored in 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 memory modules may 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.
- Close the front bezel.
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WARNING: Before you perform this procedure, you must turn off the system and disconnect it from its power source. For more information, see "Safety First— For You and Your System" in "Troubleshooting Your System." |
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CAUTION: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document. |
- Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
- Remove the system cover.
- Remove the cooling shroud (see "Removing the Cooling Shroud").
- Locate the memory module sockets in which you will install a memory module. Figure 6-9 shows the order of the memory module sockets.
- Press down and outward on the ejectors on the memory module socket, as shown in Figure 6-10, to allow the memory module to be inserted into the socket.
Figure 6-10. Installing a Memory Module
- 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 6-10).
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 6-10).
- 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 5 through 7 of this procedure to install the remaining memory modules.
- Perform steps 6 through 9 of "Performing a Memory Upgrade."
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WARNING: Before you perform this procedure, you must turn off the system and disconnect it from its power source. For more information, see "Safety First— For You and Your System" in "Troubleshooting Your System." |
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CAUTION: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document. |
- Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
- Remove the system cover.
- Remove the cooling shroud (see "Removing the Cooling Shroud").
- Locate the memory module sockets in which you will remove memory modules.
Figure 6-9 shows the order of the memory module sockets.
- Press down and outward on the ejectors on each end of the socket until the memory module pops out of the socket (see Figure 6-11).
Figure 6-11. Removing a Memory Module
To take advantage of future options in speed and functionality, you can add a second processor or replace either the primary or secondary processor.
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NOTICE: The second processor must be of the same type and speed as the first processor. |
Each processor and its associated L2 cache memory are contained in a PGA package that is installed in a ZIF socket on the system board. The following subsection describes how to install or replace the microprocessor in either the primary or secondary processor socket.
In addition to the ZIF socket for the primary microprocessor on the system board, there is a second ZIF socket to accommodate a secondary microprocessor. The secondary micro-processor must have the same operating frequency as the primary micro-processor. For example, if the system has a 933-MHz primary microprocessor, your secondary microprocessor must also be a 933-MHz microprocessor.
In a single microprocessor system, the microprocessor must be installed in the primary ZIF socket.
The following items are included in the microprocessor upgrade kit:
- A microprocessor chip
- A heat sink
- A securing clip
- A VRM, if adding a second processor
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NOTE: Dell recommends that only a technically knowledgeable person perform this procedure. |
- Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
- Remove the system cover.
- Remove the cooling shroud (see "Removing the Cooling Shroud").
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CAUTION: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document. |
- Press down on the heat-sink securing clip to release the clip from the retaining tab on the ZIF socket (see Figure 6-12).
- Remove the securing clip.
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CAUTION: Never remove the heat sink from a microprocessor unless you intend to remove the microprocessor. The heat sink is necessary to maintain proper
thermal conditions. |
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WARNING: The microprocessor chip and heat sink can become extremely hot. Be sure the microprocessor has had sufficient time to cool before handling. |
Figure 6-12. Securing Clip
- Remove the heat sink.
- Pull the socket release lever straight up until the microprocessor is released (see Figure 6-13).
- Lift the microprocessor out of the socket and leave the release lever up so that the socket is ready for the new microprocessor.
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CAUTION: Be careful not to bend any of the pins when removing the microprocessor chip. Bending the pins can permanently damage the microprocessor chip. |
Figure 6-13. Removing the Microprocessor
- Unpack the new microprocessor.
If any of the pins on the microprocessor appear bent, see "Getting Help," for instructions on obtaining technical assistance from Dell.
- Align the pin-1 corner of the microprocessor (see Figure 6-14) with the pin-1 corner of the microprocessor socket.
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NOTE: Identifying the pin-1 corners is critical to positioning the microprocessor correctly. |
Identify the pin-1 corner of the microprocessor by locating the tiny gold triangle that extends from one corner of the large central rectangular area. The gold triangle points toward pin 1, which is also uniquely identified by a square pad.
Figure 6-14. Pin-1 Identification
- Install the microprocessor in the socket (see Figure 6-15).
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CAUTION: Positioning the microprocessor incorrectly can permanently damage the microprocessor and the system when you turn on the system. When placing the microprocessor in the socket, be sure that all of the pins on the microprocessor go into the corresponding holes. Be careful not to bend the pins. |
If the release lever on the microprocessor socket is not all the way up, move it to that position now.
With the pin-1 corners of the microprocessor and socket aligned, set the microprocessor lightly in the socket and make sure all pins are matched with the correct holes in the socket. Because the system uses a ZIF micro-processor socket, there is no need to use force (which could bend the pins if the microprocessor is misaligned). When the microprocessor is positioned correctly, it should drop down into the socket with minimal pressure.
When the microprocessor is fully seated in the socket, rotate the socket release lever back down until it snaps into place, securing the microprocessor.
Figure 6-15. Installing the Microprocessor
- Place the new heat sink on top of the microprocessor (see Figure 6-16).
- Orient the securing clip as shown in Figure 6-16.
Figure 6-16. Installing the Heat-Sink
- Hook the end of the clip without the heat-sink latch to the tab on the edge of the socket facing the front of the system.
- Push down and pivot the heat-sink latch until the hole on the clip latches onto the ZIF socket tab.
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CAUTION: If you are installing a VRM, it must be a +12V VRM. |
- If you are adding a second microprocessor, place the VRM in the socket (see Figure 6-17).
- Make sure that the latches engage.
Figure 6-17. Installing the VRM
- Replace the cooling shroud (see "Installing the Cooling Shroud").
- Replace the system cover making sure that the shroud support holds the shroud in place.
- Close the front bezel.
- Reconnect your system and peripherals to their power sources, and turn on system.
- Press <F2> to enter the System Setup program, and check that 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 microprocessor, 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
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NOTE: After you remove and replace the front bezel, the chassis intrusion detector will cause the following message to be displayed at the next system start-up: |
ALERT! Bezel was previously removed.
- Enter the System Setup program, and confirm that the top line in the system data area correctly identifies the installed processor(s). See "Using the System Setup Program" in your User's Guide.
- While in the System Setup program, reset the chassis intrusion detector.
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NOTE: If a setup password has been assigned by someone else, contact your network administrator for information on resetting the chassis intrusion detector. |
- Run the Dell Diagnostics to verify that the new microprocessor is operating correctly. See "Running the Dell™ Diagnostics," for information on running the diagnostics and troubleshooting any problems that may occur.
To activate the integrated PERC 3/Di, perform the following steps.
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WARNING: Before you perform this procedure, you must turn off the system and disconnect it from its power source. For more information, see "Safety First— For You and Your System" in "Troubleshooting Your System." |
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NOTICE: To avoid possible data loss, back up all data on the hard-disk drives before changing the mode of operation of the integrated SCSI controller from SCSI to RAID. |
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CAUTION: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document. |
- Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
- Remove the system cover.
- Remove the cooling shroud.
- Open the ejectors on the RAID controller memory module socket down and outward, as shown in Figure 6-18, to allow the memory module to be inserted into the socket.
See Figure 6-1 for the location of the socket on the system board.
Figure 6-18. Installing the RAID Controller Memory Module
- Align the memory module's edge connector with the slot in the center of the memory module socket, and insert the memory module in the socket (see Figure 6-18).
The memory module socket has two alignment keys that allow the memory module to be installed in the socket in only one way.
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NOTE: The RAID controller memory module must be an unbuffered memory module, rated to run at 100 MHz or faster. Do not substitute registered memory modules such as those used for system memory. |
- Press on the memory module with your thumbs while pulling on the ejectors with your index fingers to lock the memory module into the socket.
- Install the RAID hardware key in its socket on the system board (see Figure 6-1).
Insert the hardware key into the socket and secure the key with the latches on each end of the socket (see Figure 6-19).
Figure 6-19. Installing the RAID Key
- Install the RAID battery (see "Installing the RAID Battery").
- Replace the cooling shroud and system cover; reconnect the system and peripherals to their power sources and turn them on.
- Install the RAID software.
For details, see the RAID controller documentation.
- Hook the front edge of the battery assembly into the slot in the bay, then snap the back edge of the battery assembly into place so the battery lies flat in the bay (see Figure 6-20).
- Connect the battery cable to the RAID battery connector (RAID_BTRY) on the system board (see Figure 6-1).
- Install the peripheral bay (see "Installing the Peripheral Bay").
- Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
- Remove the system cover.
- Remove the peripheral bay (see "Removing the Peripheral Bay").
- Disconnect the battery cable from the RAID battery connector (RAID_BTRY) on the system board (see Figure 6-1).
- Press the release clip on the RAID battery and lift straight up to clear the system (see Figure 6-20).
Figure 6-20. Removing and Installing the RAID 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
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 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.
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NOTE: 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. |
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NOTE: 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 boots until you replace the battery.
The battery is a 3.0-volt (V), coin-cell battery. To remove the battery, perform the following steps.
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WARNING: Before you perform this procedure, you must turn off the system and disconnect it from its power source. For more information, see "Safety First— For You and Your System" in "Troubleshooting Your System." |
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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.
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CAUTION: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document. |
- Open the front bezel (see "Removing the Front Bezel" in "Troubleshooting Your System").
- Remove the system cover.
- Remove the battery (see Figure 6-1, 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 6-21).
Figure 6-21. Installing the Battery
- Replace the system cover, and then reconnect the system and peripherals to their power sources 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 front 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, see "Getting Help," for instructions on obtaining technical assistance.
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Removing and Replacing Fan Assemblies