Manuals

Chapter 4, "Removing and Replacing Parts": Dell Dimension P133v, P166v, and P200v

Chapter 4, "Removing and Replacing Parts": Dell™ Dimension™ P133v, P166v, and P200v

This chapter provides procedures for removing and replacing components, assemblies, and subassemblies in the system unit. Unless otherwise noted, each of the procedures in this chapter assumes the following:

The system unit cover has already been removed.
A part can be replaced by performing the removal procedure in reverse order.

Recommended Tools

Most of the procedures in this chapter require the use of one or more of the following tools:

Small flat-blade screwdriver
Number 1 and number 2 Phillips-head screwdrivers
Chip-removal tool
1/4-inch nutdriver
Tweezers or long-nose pliers

Also, use a wrist grounding strap as explained in the next section, "Precautionary Measures."

Precautionary Measures

Before performing any of the procedures in this chapter, read the following warning.

WARNING: FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT: Before starting to work on the computer system, perform the following steps in the sequence indicated.

Turn off the system unit and any attached peripherals.

Disconnect the system unit and any attached peripherals from their power sources to reduce the potential for personal injury or shock. Disconnect any telephone or telecommunication lines from the system unit before removing the cover.

To avoid possible damage to the equipment from ESD, wear a wrist grounding strap and clip it to an unpainted metal surface, such as the system power supply's fan guard, on the chassis.

If a wrist grounding strap is not available, touch the fan guard or some unpainted metal surface on the back of the system unit to discharge any static charge from your body.

System Unit Cover

Figure 4-1. System-Unit Cover Removal

To remove the system unit cover from a desktop or mini tower system, follow these steps:

Position the system unit on the work surface with the back of the system unit facing away from you. If you are working on a mini tower system, lay the chassis on its right side with the chassis foot off the edge of the work surface to allow the system unit to lay flat.

Loosen the thumbscrew that secures the cover to the back of the system unit.

NOTE: The thumbscrew is captive and should be retained in the cover when loosened.

Facing the front of the chassis, place both hands palm-side down as shown in Figure 4-1. With your index fingers, press in on the cover release latches, and slide the cover toward the back of the chassis approximately one inch. Then lift the cover away from the chassis.

WARNING: Be sure to keep your hands clear of the metal edges on the chassis and fan guard as you slide the cover back. Sharp metal edges can cause cuts.

Front Bezel

Figure 4-2. Front-Bezel Removal (Mini Tower Chassis)
Figure 4-3. Front-Bezel Removal (Desktop Chassis)

To remove the front bezel, follow these steps:

Press the three tabs along the edge of the front bezel.
Rotate the bezel away from the chassis, and disengage the three retaining hooks on the bezel.

Drives

The following subsections explain how to remove the drive cage, front-panel inserts, and the various types of drives in the drive bays.

Drive Cage

Figure 4-4. Drive Cage Removal

Whenever you need to remove or install a drive in the drive cage, first remove the drive cage from the chassis as follows:

Note the location and orientation of all cables attached to drives installed in the drive cage. Then disconnect the cables.
Remove the screw at the top of the drive cage securing it to the chassis.
Slide the drive cage forward approximately one inch. Then lift it up and away from the chassis.

NOTE: The side of the chassis contains a detent feature that locks the drive cage into place. The drive cage may be slightly difficult to slide forward until it is detached from this detent.

Front-Panel Inserts

Figure 4-5. Front-Panel Insert Removal

The front-panel inserts are attached to the drive cage. Any empty bay should have a front-panel insert installed. To remove a front-panel insert, follow these steps:

Remove the front bezel.
Press the two tabs on the right side of the front-panel insert.
Rotate the right side of the front-panel insert outward to disengage the retaining hook on the left side of the insert from the chassis.

5.25-Inch Drives

Figure 4-6. 5.25-Inch Drive Removal

To remove a drive from a 5.25-inch drive bay, follow these steps:

Remove the front bezel.
Remove the drive cage and drives as an assembly.
Remove the three drive-mounting screws, and slide the drive out of the bay.

Upper 3.5-Inch Drive

Figure 4-7. Upper 3.5-Inch Drive Removal

The upper 3.5-inch drive uses a drive bracket between the drive and the right side of the drive cage.

To remove a drive from the upper 3.5-inch drive bay, follow these steps:

Remove the front bezel.
Remove the drive cage and drives as an assembly.
Remove the two drive-assembly mounting screws, and slide the drive assembly out of the bay.
Remove the two drive-bracket mounting screws, and remove the drive bracket from the drive. If you are working on a desktop chassis, the small plastic filler panel remains in place on the front face of the drive bracket.

Lower 3.5-Inch Drive

Figure 4-8. Lower 3.5-Inch Drive Removal

NOTE: The following procedure applies only to the mini tower chassis.

The lower 3.5-inch drive attaches to the left side and bottom of the drive cage. To remove a drive from the lower 3.5-inch drive bay, follow these steps:

Remove the front bezel.
Remove the drive cage and drives as an assembly.
Remove the three drive-mounting screws from the left side and bottom of the drive cage.

3.5-Inch Diskette Drive

Figure 4-9. 3.5-Inch Diskette Drive Removal

To remove the 3.5-inch diskette drive, follow these steps:

Remove the front bezel.
Disconnect the DC power and interface cables from the back of the 3.5-inch diskette drive.
Press the two drive-release tabs, and slide the drive out of the bay.

Transfer the drive-release tabs to the replacement diskette drive before installing the new drive.

Primary Hard-Disk Drive

Figure 4-10. Primary Hard-Disk Drive Removal

To remove the primary hard-disk drive, follow these steps:

Remove the front bezel.
Remove the two mounting screws.
Lift the primary hard-disk drive out of the card guide assembly.
Disconnect the DC power and interface cables from the back of the primary hard-disk drive.

Secondary Hard-Disk Drive

Figure 4-11. Secondary Hard-Disk Drive Assembly Removal

To remove the secondary hard-disk drive, follow these steps:

Remove the front bezel.
Disconnect the DC power and interface cables from the back of the secondary hard-disk drive.
Remove the two drive-assembly mounting screws.
Slide the secondary hard-disk drive assembly toward the back of the chassis, and lift it out.
To remove the secondary hard-disk drive from the drive bracket, remove the screw from the side of the hard-disk drive, and then pivot the bracket away from the drive. Figure 4-12. Secondary Hard-Disk Drive Removal.

When you insert the replacement hard-disk drive into the drive bracket, be sure that the two tabs on the bracket fit into the mounting holes on the side of the drive.

Power Supply

Figure 4-13. Power Supply Removal

To remove the power supply, follow these steps:

Disconnect the AC power cable from the power supply.
Disconnect the DC power cables from the POWER connector on the system board (see Figure 4-18).
Disconnect the DC power cables from all the drives.
Remove the two power-supply mounting screws from the back of the chassis and a third mounting screw inside the chassis.
Lift the power supply out of the chassis.

Cooling-Fan Assembly

Figure 4-14. Cooling-Fan Assembly Removal

To remove the cooling-fan assembly, follow these steps:

Disconnect the cooling-fan cable from the J7M1 connector on the system board.
At the back of the chassis, press the two cooling-fan assembly release buttons, and lift the cooling-fan assembly out of the chassis.
Maintain upward pressure on the fan assembly while you press the two cooling-fan assembly release buttons.

Expansion Cards

Figure 4-15. Expansion-Card Removal

To remove an expansion card, follow these steps:

Disconnect any cables from the expansion card. Note the location of each connector and the orientation of any cables attached to the expansion card before disconnecting these cables.
Remove the retaining screw from the card-mounting bracket.
Grasp the expansion card by its corners, and carefully pull it out of its expansion-card connector.

Card Guide Assembly

Figure 4-16. Card-Guide Assembly Removal

To remove the card guide assembly, follow these steps:

Disconnect any cables connected to full-length expansion cards, and remove these expansion cards.
Note the location of each connector and the orientation of any cables attached to the expansion cards before disconnecting these cables.
Remove the 3.5-inch diskette drive.
Remove the primary hard-disk drive.
If present, remove the secondary hard-disk drive assembly.
Disconnect the control panel cable from connector J9E1 on the system board.
Press the four mounting tabs that secure the card guide assembly to the front panel, and press down on the tab at the back of the card guide assembly.
Lift the card guide assembly, including the control panel cable, out of the chassis.

Control Panel Board

Figure 4-17. Control-Panel Board Removal

To remove the control panel board, follow these steps:

Remove the front bezel.
Remove the card guide assembly.
Press the mounting tab to release the control panel board from the card guide assembly, and remove the control panel board.

System Board Components

DIMMs | Microprocessor/Heat Sink Assembly | Cache Card | Video-Memory Upgrade Chips | Battery

Figure 4-18 shows the locations of components on the system board. The subsections that follow explain how to remove the various system board components.

Figure 4-18. System Board Components

DIMMs

Figure 4-19. DIMM Removal

To remove a DIMM, carefully press down on the ejector tabs at each end of the DIMM socket.

To replace a DIMM, position it in its socket as shown in Figure 4-20. Carefully press one end of the DIMM and then the other into the socket until the DIMM is completely seated. Secure the DIMM by snapping the ejector tabs over each end of the DIMM.

CAUTION: Pressing on the center of the DIMM may damage the DIMM.

Figure 4-20. DIMM Replacement

Microprocessor/Heat Sink Assembly

Figure 4-21. Microprocessor Removal

To remove the microprocessor/heat sink assembly, follow these steps.

WARNING: The microprocessor chip can get extremely hot during intense system operations. Be sure that the chip has had sufficient time to cool before you touch it.

Remove the microprocessor securing clip from the microprocessor/heat sink assembly. Press down on the folded part of the clip with a small screwdriver to release the clip.
Push outward and then upward on the microprocessor release lever, and rotate the lever to its fully vertical position.
Lift the microprocessor/heat sink assembly out of its socket.

To install the replacement microprocessor/heat sink assembly, ensure that the microprocessor release lever is in its fully vertical position to allow the microprocessor pins to easily slip into the socket. When the microprocessor/heat sink assembly is in place, rotate the microprocessor release lever to its horizontal position. Hook the microprocessor securing clip over the socket tab nearest the front of the system board, and then snap it over the tab on the back of the socket.

NOTE: Pin 1 on the microprocessor is located on the corner with the largest bevel. The pin-1 hole in the microprocessor socket is located on the corner where the holes are in a diagonal pattern.

Cache Card

Figure 4-22. Cache Card Removal

To remove the cache card, grasp the card by its edges and carefully work it free from the cache card connector.

Video-Memory Upgrade Chips

Figure 4-23. Video-Memory Chip Removal

Replaceable video-memory upgrade chips are installed on systems that have been upgraded from 1 MB to 2 MB of video memory. Follow these steps to remove and replace the video-memory upgrade chips:

Locate the U7D1 and U7D2 sockets on the system board. See Figure 4-18 for the location of the video-memory upgrade sockets.
Use a chip-removal tool similar to the one shown in Figure 4-23 to remove a video-memory upgrade chip from its socket:

Insert the chip-removal tool into the openings at the end of the chip.

Press inward on the sides of the tool.

Lift the chip out of its socket.

To replace a video-memory upgrade chip, orient the chip so that the alignment dot on one corner of the chip is near the beveled corner of the socket.

CAUTION: A bent pin can render a chip inoperative and possibly damage the system. Be careful not to bend any pins when you insert a chip.

Battery

Figure 4-24. Battery Removal

The battery is a 3.0-V, coin-cell CR2032-type battery. To remove the battery, follow these steps:

If possible, enter the system setup program and make a printed copy of the system setup screens.
Remove the system unit cover.
Remove the battery. Pry the battery out of its socket with your fingers or a blunt, nonconductive object, such as a plastic screwdriver.
To replace the battery, install the new battery with the "+" side facing up. Then start the system setup program, and reset the Date and Time categories. Compare the system configuration settings with the copy made in step 1. Restore any system configuration information that was lost while the battery was replaced.

System Board

Figure 4-25. System Board Removal

To remove the system board, follow these steps:

Disconnect any cables attached to the I/O panel on the back of the system unit.
Remove any installed expansion cards. Note the location of each connector and the orientation of any cables attached to the expansion cards before disconnecting these cables.
Remove the 3.5-inch diskette drive and the secondary hard-disk drive.
Disconnect all internal cables from the system board.
The cables attached to the PRI EIDE, SEC EIDE, and FLOPPY connectors (see Figure 4-18) each have two latches securing them to the system board. Press the latch on each end of the cable connector, and pull to release the cable from the system board.
Remove the screws that secure the system board to the chassis.

Carefully lift the system board out from the plastic standoffs, and remove the board from the chassis.
To install a replacement system board, transfer the DIMMs and cache card to the new system board. If the new system board does not have a microprocessor installed, transfer the microprocessor from the old system board to the new system board and set the configuration jumpers to match the old system board.

When installing the new system board in the computer, push the system board against the back of the chassis so that the system board makes firm contact with the I/O gasket to prevent EMI leakage.

CAUTION: Failure to install the system board exactly as described may result in EMI leakage that could interfere with other electronic devices.

Figure 4-26. System Board Mountings