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Dell Latitude D600 Service Manual

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  Summary of Contents for Dell Latitude D600

  • Page 1 Thank you for purchasing this Factory Service Manual CD/DVD from servicemanuals4u.com. Please check out our eBay auctions for more great deals on Factory Service Manuals: servicemanuals4u...
  • Page 2: Notes, Notices, And Cautions

    A CAUTION indicates a potential for property damage, personal injury, or death. Information in this document is subject to change without notice. © 2003 Dell Inc. All rights reserved. Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden. file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...ok/Latitude/D600/D600_SERVICE_MANUAL/index.htm (1 of 2)6/21/2004 2:15:10 AM...
  • Page 3 Dell Latitude D600 Service Manual Trademarks used in this text: Dell, the DELL logo, and Latitude are trademarks of Dell Inc.; Intel is a registered trademark of Intel Corporation; Bluetooth is a trademark owned by Bluetooth SIG, Inc. and is used by Dell Inc. under license.
  • Page 4: Before You Begin

    CAUTION: Only a certified service technician should perform repairs on your computer. Damage due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow applicable instructions in the safety instructions in the System Information Guide that came with the computer.
  • Page 5: Recommended Tools

    Before You Begin: Dell Latitude D600 Service Manual 6. To avoid possible damage to the system board, wait 10 to 20 seconds and then disconnect any attached devices. 7. Disconnect all other external cables from the computer. 8. Remove any installed PC Cards from the PC Card slot.
  • Page 6: Computer Orientation

    Before You Begin: Dell Latitude D600 Service Manual The procedures in this manual require the following tools: #1 Phillips screwdriver ¼-inch flat-blade screwdriver Small plastic scribe Flash BIOS update program floppy disk or CD Computer Orientation back right front left...
  • Page 7: Screw Identification

    Before You Begin: Dell Latitude D600 Service Manual Screw Identification When you are removing and replacing components, photocopy "Screw Identification" as a tool to lay out and keep track of the screws. The placemat provides the number of screws and their sizes.
  • Page 8: Display Assembly

    Before You Begin: Dell Latitude D600 Service Manual Display Assembly: Display Bezel: Display Panel: (3 each) (6 each) (4 each) Display Latch: Palm Rest: Fan: (2 each) (3 each) (2 each) (9 each) file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...ok/Latitude/D600/D600_SERVICE_MANUAL/begin.htm (5 of 6)6/21/2004 2:15:11 AM...
  • Page 9: System Board

    Before You Begin: Dell Latitude D600 Service Manual Speakers: Modem: System Board: (1 each) (1 each) (1 each) (1 each) (1 each) (4 each) Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...ok/Latitude/D600/D600_SERVICE_MANUAL/begin.htm (6 of 6)6/21/2004 2:15:11 AM...
  • Page 10: System Components

    NOTICE: Only a certified service technician should perform repairs on your computer. Damage due to servicing that is not authorized by Dell is not covered by your warranty. NOTICE: Unless otherwise noted, each procedure in this document assumes that a part can be replaced by performing the removal procedure in reverse order.
  • Page 11 System Components: Dell Latitude D600 Service Manual display assembly See MINI RSL speakers 2N406 center control cover 8M659 hard drive See MINI RSL palm rest 6M859 modem Y0231 system board U0996 thermal cooling assembly 2N403 computer base F1727 4R197 battery...
  • Page 12: Memory Module

    Memory Module, Mini PCI Card, and Modules: Dell Latitude D600 Service Manual Back to Contents Page Memory Module, Mini PCI Card, and Modules Dell™ Latitude™ D600 Service Manual Memory Module Mini PCI Card Modules Memory Module CAUTION: Before working inside your Dell™ computer, read the safety instructions in your System Information Guide.
  • Page 13 Memory Module, Mini PCI Card, and Modules: Dell Latitude D600 Service Manual NOTICE: To prevent damage to the memory module connector, do not use tools to spread the inner metal tabs that secure the memory module. 3. If you are replacing a memory module, remove the existing module.
  • Page 14 Memory Module, Mini PCI Card, and Modules: Dell Latitude D600 Service Manual NOTICE: If you need to install memory modules in two connectors, install a memory module in the connector labeled "JDIM (Slot 1)" before you install a module in the connector labeled "JDIM2."...
  • Page 15: Mini Pci Card

    As the computer boots, it detects the additional memory and automatically updates the system configuration information. Mini PCI Card If you ordered a Mini PCI card at the same time that you ordered your computer, Dell has already installed the card for you. CAUTION: Before working inside your computer, read the safety instructions in your System Information Guide.
  • Page 16 Memory Module, Mini PCI Card, and Modules: Dell Latitude D600 Service Manual 4. If a Mini PCI card is not already installed, go to step 5. If you are replacing a Mini PCI card, remove the existing card: a. Disconnect the Mini PCI card from any attached cables.
  • Page 17 Memory Module, Mini PCI Card, and Modules: Dell Latitude D600 Service Manual 1 antenna cables 2 antenna connectors on card (2) 7. Lower the Mini PCI card toward the inner tabs to approximately a 20-degree angle. 8. Continue lowering the Mini PCI card until it snaps into the inner tabs of the connector.
  • Page 18 Memory Module, Mini PCI Card, and Modules: Dell Latitude D600 Service Manual NOTE: You do not need to install the device security screw unless you want to secure the module inside the computer for security purposes. If the Device Security Screw Is Not Installed...
  • Page 19 Memory Module, Mini PCI Card, and Modules: Dell Latitude D600 Service Manual If the Device Security Screw Is Installed 1. If the computer is connected to a docking device (docked), undock it. See the documentation that came with your docking device for instructions.
  • Page 20 Memory Module, Mini PCI Card, and Modules: Dell Latitude D600 Service Manual M2 x 3-mm screw 7P786 4. Press the device latch release so that the latch release pops out. 5. Pull the device by the latch release to remove the device from the module bay.
  • Page 21 Memory Module, Mini PCI Card, and Modules: Dell Latitude D600 Service Manual Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/L...atitude/D600/D600_SERVICE_MANUAL/upgrades.htm (10 of 10)6/21/2004 2:15:14 AM...
  • Page 22: Reserve Battery

    Back to Contents Page Reserve Battery Dell™ Latitude™ D600 Service Manual CAUTION: Before working inside your Dell™ computer, read the safety instructions in your System Information Guide. CAUTION: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your computer's electronic components.
  • Page 23 Reserve Battery: Dell Latitude D600 Service Manual 5. Disconnect the reserve battery cable connector from the speaker connector. speaker connector reserve battery D1004 Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA.../Latitude/D600/D600_SERVICE_MANUAL/reserve.htm (2 of 2)6/21/2004 2:15:15 AM...
  • Page 24: Hard Drive

    Hard drives are extremely fragile; even a slight bump can damage the drive. NOTE: Dell does not guarantee compatibility or provide support for hard drives from sources other than Dell. 1. Follow the instructions in "Preparing to Work Inside the Computer."...
  • Page 25 Hard Drive: Dell Latitude D600 Service Manual NOTICE: If you do not open the display before you remove your hard drive, you might permanently scratch your display. 3. Open the display approximately 1/2 inch, as shown in the following figure.
  • Page 26 Hard Drive: Dell Latitude D600 Service Manual 8. Use the Operating System CD to install the operating system for your computer. 9. Use the Drivers and Utilities CD to install the drivers and utilities for your computer. Back to Contents Page...
  • Page 27 Keyboard: Dell Latitude D600 Service Manual Back to Contents Page Keyboard Dell™ Latitude™ D600 Service Manual CAUTION: Before performing the following procedures, read the safety instructions in your System Information Guide. NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as the back panel) on the computer.
  • Page 28 Keyboard: Dell Latitude D600 Service Manual center control cover computer base 3. Remove the center control cover: a. Open the display all the way (180 degrees) so that it lies flat against your work surface. b. Starting on the right side of the computer, use a plastic scribe to pry up the center control cover.
  • Page 29 Keyboard: Dell Latitude D600 Service Manual b. Hold the keyboard up and slightly forward to allow access to the keyboard connector. c. Pull up on the keyboard connector tab to disconnect the keyboard connector from the system board. NOTE: When you replace the keyboard, ensure that the keyboard tabs are completely in place to avoid scratching the palmrest.
  • Page 30: Display Assembly And Display Latch

    Display Assembly and Display Latch: Dell Latitude D600 Service Manual Back to Contents Page Display Assembly and Display Latch Dell™ Latitude™ D600 Service Manual Display Assembly Display Bezel Display Panel Display Latch Display Assembly CAUTION: Before performing the following procedures, read the safety instructions in your System Information Guide.
  • Page 31 Display Assembly and Display Latch: Dell Latitude D600 Service Manual M2.5 x 6-mm screws (3) 057HW display cable connector display computer base pull-tab connector file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA.../Latitude/D600/D600_SERVICE_MANUAL/display.htm (2 of 9)6/21/2004 2:15:18 AM...
  • Page 32 Display Assembly and Display Latch: Dell Latitude D600 Service Manual display cable-routing clips (4) display cable connector 5. Pull up on the pull-tab that is attached to the display cable connector to remove the connector from the system board. 6. Remove the three M2.5 x 6-mm screws.
  • Page 33: Computer Base

    Display Assembly and Display Latch: Dell Latitude D600 Service Manual display computer base file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA.../Latitude/D600/D600_SERVICE_MANUAL/display.htm (4 of 9)6/21/2004 2:15:18 AM...
  • Page 34 Display Assembly and Display Latch: Dell Latitude D600 Service Manual display bumpers (6) 6R933 top cover 8M669 M2 x 5-mm screws (6) 1428U flex-cable retention bracket 4270E file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA.../Latitude/D600/D600_SERVICE_MANUAL/display.htm (5 of 9)6/21/2004 2:15:18 AM...
  • Page 35: Display Bezel

    Carefully separate the bezel from the top cover to avoid damage to the bezel. 6. Starting at the bottom of the display panel (by the Dell™ logo), use your fingers to separate the bezel from the top cover by lifting the inside edge of the bezel away from the top cover.
  • Page 36 Display Assembly and Display Latch: Dell Latitude D600 Service Manual 3. Remove the display bezel. 4. Remove the two M2 x 3-mm screws from each side of the display panel, and remove the display side brackets. NOTE: When you replace the display side brackets, ensure that the tabs on the brackets are facing up.
  • Page 37: Display Latch

    Display Assembly and Display Latch: Dell Latitude D600 Service Manual 1 top flex-cable connector 6M871 (flex cable, flex-cable connector, and pull-tab) 2 top display-cable connector 3 pull-tab on bottom flex-cable connector 9. Press in both sides of the top display cable connector, and pull the display cable connector away from the top flex-cable connector.
  • Page 38 Display Assembly and Display Latch: Dell Latitude D600 Service Manual 2. Remove the display assembly. 3. Remove the display bezel. 4. Remove the two M2.5 x 4-mm screws that secure the display latch bracket to the top cover. 5. Lift the display bracket out of the top cover, and then remove the display latch.
  • Page 39 Palm Rest: Dell Latitude D600 Service Manual Back to Contents Page Palm Rest Dell™ Latitude™ D600 Service Manual CAUTION: Before performing the following procedures, read the safety instructions in your System Information Guide. NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as the back panel) on the computer.
  • Page 40 Palm Rest: Dell Latitude D600 Service Manual M2 x 3-mm screws (3) 4270E top of the palm rest 5. Disconnect the touch pad connector from the system board. 1 back center of the palm rest 2 touch pad connector 3 system board connector 4 computer base 6.
  • Page 41 Palm Rest: Dell Latitude D600 Service Manual M2.5 x 8-mm screws (9) 3R690 NOTICE: Carefully separate the palm rest from the computer base to avoid damage to the palm rest. 7. Starting at the back center of the palm rest, use your fingers to separate the palm rest from the computer base by lifting the inside of the palm rest while pushing in on the outside.
  • Page 42: Installing The Docking Doors

    Docking Doors: Dell Latitude D600 Service Manual Back to Contents Page Docking Doors Dell™ Latitude™ D600 Service Manual Removing the Docking Doors CAUTION: Before working inside your computer, read the safety instructions in your System Information Guide. NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as the back panel) on the computer.
  • Page 43 Docking Doors: Dell Latitude D600 Service Manual docking doors with spring 7R316 longer post Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...Latitude/D600/D600_SERVICE_MANUAL/dockdoor.htm (2 of 2)6/21/2004 2:15:19 AM...
  • Page 44 Fan: Dell Latitude D600 Service Manual Back to Contents Page Dell™ Latitude™ D600 Service Manual CAUTION: Before performing the following procedures, read the safety instructions in your System Information Guide. NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as the back panel) on the computer.
  • Page 45 Fan: Dell Latitude D600 Service Manual M2.5 x 8-mm screws (2) 3R690 4R197 fan cable connector system board connector 6. Remove the two M2.5 x 8-mm screws from the fan, and pull the fan away from the system board. Back to Contents Page...
  • Page 46 Fan: Dell Latitude D600 Service Manual file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...20ok/Latitude/D600/D600_SERVICE_MANUAL/fan.htm (3 of 3)6/21/2004 2:15:20 AM...
  • Page 47: Bluetooth™ Card

    Bluetooth™ Card: Dell Latitude D600 Service Manual Back to Contents Page Bluetooth™ Card Dell™ Latitude™ D600 Service Manual CAUTION: Before performing the following procedures, read the safety instructions in your System Information Guide. NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as the back panel) on the computer.
  • Page 48 Bluetooth™ Card: Dell Latitude D600 Service Manual Bluetooth card 1U746 system board connector Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...0ok/Latitude/D600/D600_SERVICE_MANUAL/blue.htm (2 of 2)6/21/2004 2:15:20 AM...
  • Page 49: Removing The Microprocessor Thermal-Cooling Assembly

    Microprocessor Thermal-Cooling Assembly: Dell Latitude D600 Service Manual Back to Contents Page Microprocessor Thermal-Cooling Assembly Dell™ Latitude™ D600 Service Manual Removing the Microprocessor Thermal-Cooling Assembly CAUTION: Before performing the following procedures, read the safety instructions in your System Information Guide.
  • Page 50 Microprocessor Thermal-Cooling Assembly: Dell Latitude D600 Service Manual microprocessor thermal-cooling assembly 2N403 captive screws (4) 4. Rotate the microprocessor thermal-cooling assembly up toward the side of the computer and away from the system board. Installing the Microprocessor Thermal-Cooling Assembly 1. Place the left side of the microprocessor thermal-cooling assembly under the palm rest and rotate the assembly onto the system board.
  • Page 51 Microprocessor Thermal-Cooling Assembly: Dell Latitude D600 Service Manual file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA.../Latitude/D600/D600_SERVICE_MANUAL/thermal.htm (3 of 3)6/21/2004 2:15:21 AM...
  • Page 52: Removing The Microprocessor Module

    Microprocessor Module: Dell Latitude D600 Service Manual Back to Contents Page Microprocessor Module Dell™ Latitude™ D600 Service Manual Removing the Microprocessor Module CAUTION: Before performing the following procedures, read the safety instructions in your System Information Guide. NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as the back panel) on the computer.
  • Page 53: Installing The Microprocessor Module

    Microprocessor Module: Dell Latitude D600 Service Manual 1 screwdriver (perpendicular to microprocessor) 2 ZIF-socket cam screw 3 ZIF socket 4 pin-1 corner NOTE: The ZIF-socket cam screw secures the microprocessor to the system board. Take note of the arrow on the ZIF-socket cam screw.
  • Page 54 Microprocessor Module: Dell Latitude D600 Service Manual NOTICE: Ensure that the cam lock is in the fully open position before seating the microprocessor module. Seating the microprocessor module properly in the ZIF socket does not require force. NOTICE: A microprocessor module that is not properly seated can result in an intermittent connection or permanent damage to the microprocessor and ZIF socket.
  • Page 55: Flashing The Bios

    Flashing the BIOS: Dell Latitude D600 Service Manual Back to Contents Page Flashing the BIOS Dell™ Latitude™ D600 Service Manual 1. Ensure that the AC adapter is plugged in and that the main battery is installed properly. NOTE: If you use a BIOS update program CD to flash the BIOS, set up the computer to boot from a CD before inserting the CD.
  • Page 56 Speakers: Dell Latitude D600 Service Manual Back to Contents Page Speakers Dell™ Latitude™ D600 Service Manual CAUTION: Before performing the following procedures, read the safety instructions in your System Information Guide. NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as the back panel) on the computer.
  • Page 57 Speakers: Dell Latitude D600 Service Manual speaker 2N406 M2.5 x 4-mm screw 6240E speaker connector computer base system board connector M2.5 x 8-mm screw 3R690 reserve battery 3R459 Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...Latitude/D600/D600_SERVICE_MANUAL/speakers.htm (2 of 2)6/21/2004 2:15:23 AM...
  • Page 58: Base Latch

    Base Latch: Dell Latitude D600 Service Manual Back to Contents Page Base Latch Dell™ Latitude™ D600 Service Manual CAUTION: Before performing the following procedures, read the safety instructions in your System Information Guide. NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as the back panel) on the computer.
  • Page 59 Base Latch: Dell Latitude D600 Service Manual base latch 1N487 computer base Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...ok/Latitude/D600/D600_SERVICE_MANUAL/latch.htm (2 of 2)6/21/2004 2:15:24 AM...
  • Page 60 Modem: Dell Latitude D600 Service Manual Back to Contents Page Modem Dell™ Latitude™ D600 Service Manual CAUTION: Before performing the following procedures, read the safety instructions in your System Information Guide. NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as the back panel) on the computer.
  • Page 61 Modem: Dell Latitude D600 Service Manual modem Y0231 system board connector pull-tab modem cable M2 x 3-mm screw 4270E 6. Disconnect the modem cable from the modem. NOTICE: Do not disconnect the modem cable from the system board. 7. Pull up on the pull-tab to disconnect the modem from the system board connector.
  • Page 62: Modem Cable

    Modem: Dell Latitude D600 Service Manual modem modem cable Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/L...k/Latitude/D600/D600_SERVICE_MANUAL/modem.htm (3 of 3)6/21/2004 2:15:24 AM...
  • Page 63: Removing The System Board

    System Board: Dell Latitude D600 Service Manual Back to Contents Page System Board Dell™ Latitude™ D600 Service Manual Removing the System Board CAUTION: Before performing the following procedures, read the safety instructions in your System Information Guide. NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as the back panel) on the computer.
  • Page 64 System Board: Dell Latitude D600 Service Manual M2.5 x 4-mm screw 6240E M2.5 x 8-mm screw 3R690 system board U0996 file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...Latitude/D600/D600_SERVICE_MANUAL/sysboard.htm (2 of 4)6/21/2004 2:15:25 AM...
  • Page 65: Installing The System Board

    System Board: Dell Latitude D600 Service Manual M2 x 3-mm screws (4) 4270E 9. Remove the four M2 x 3-mm screws labeled "circle B" that secure the system board to the computer base. 10. Pull out the system board starting from the front of the palm rest.
  • Page 66 System Board: Dell Latitude D600 Service Manual 3. Insert the floppy disk or CD that accompanied the replacement system board into the appropriate drive. Follow the instructions that appear on the screen. Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...Latitude/D600/D600_SERVICE_MANUAL/sysboard.htm (4 of 4)6/21/2004 2:15:25 AM...
  • Page 67: Pin Assignments For I/O Connectors

    Pin Assignments for I/O Connectors: Dell Latitude D600 Service Manual Back to Contents Page Pin Assignments for I/O Connectors Dell™ Latitude™ D600 Service Manual USB Connector Video Connector Parallel Connector USB Connector Signal USB5V+ USBP– USBP+ Video Connector file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA.../Latitude/D600/D600_SERVICE_MANUAL/pinouts.htm (1 of 3)6/21/2004 2:15:26 AM...
  • Page 68: Parallel Connector

    Pin Assignments for I/O Connectors: Dell Latitude D600 Service Manual Signal Signal CRT_R CRT_G CRT_B MONITOR_DETECT– DDC_DATA CRT_HS CRT_VS DDC_CLK Parallel Connector file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA.../Latitude/D600/D600_SERVICE_MANUAL/pinouts.htm (2 of 3)6/21/2004 2:15:26 AM...
  • Page 69 Pin Assignments for I/O Connectors: Dell Latitude D600 Service Manual Signal Signal STROBE– ACK– BUSY SLCT AFD/3M– ERROR– INIT– SLIN– 18-25 Back to Contents Page file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA.../Latitude/D600/D600_SERVICE_MANUAL/pinouts.htm (3 of 3)6/21/2004 2:15:26 AM...
  • Page 70 Mini Recommended Spares List: Dell Latitude D600 Service Manual Back to Contents Page Mini Recommended Spares List Dell™ Latitude™ D600 Service Manual NOTE: The part numbers listed below are subject to change. Bottom Base Parts N0441 memory door 7R843 Mini PCI card door...
  • Page 71 Mini Recommended Spares List: Dell Latitude D600 Service Manual Floppy Drive 2R152 floppy drive, D-module Hard Drive and Accessories 8X209 20 G HDD 8X210 30 G HDD 8X211 40 G HDD 7X889 60 G HDD 7T651 40 G HDD, D-module, second...
  • Page 72: Power Source

    Mini Recommended Spares List: Dell Latitude D600 Service Manual 6M873 display bezel 8M669 top cover, 14.1 inch (includes latch and hinges) Memory 3Y180 128 MB DIMM 3Y182 256 MB DIMM 0K963 512 MB DIMM 7N020 1 G DIMM Modem Y0231...
  • Page 73: Thermal Cooling Assembly

    Mini Recommended Spares List: Dell Latitude D600 Service Manual Processors 7U338 1.3 GHz CPU 7R414 1.4 GHz CPU 6R637 1.5 GHz CPU 4R867 1.6 GHz CPU 4W884 1.7 GHz CPU Speaker 2N406 speaker Thermal Cooling Assembly 2N403 thermal cooling assembly...