Lenovo E40–80 Hardware Maintenance Manual
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Lenovo E40–80 Hardware Maintenance Manual

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Hardware Maintenance Manual
Lenovo E40–80

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  • Page 1 Hardware Maintenance Manual Lenovo E40–80...
  • Page 2 Appendix A “Notices” on page 79. First Edition (March 2015) © Copyright Lenovo 2015. LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant a General Services Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-35F-05925.

  • Page 3: Table Of Contents

    Trademarks ....Chapter 7. Function keys ..31 Appendix B. Abbreviation table ..81 Chapter 8. Locations ..33 © Copyright Lenovo 2015...
  • Page 4 Hardware Maintenance Manual...

  • Page 5: About This Manual

    Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively. Before servicing a Lenovo product, be sure to read all the information under Chapter 1 “Safety information” on page 1 and Chapter 2 “Important service information” on page 19.
  • Page 6 Hardware Maintenance Manual...

  • Page 7: Chapter 1. Safety Information

    Do not use this type of mat to protect yourself from electrical shock. © Copyright Lenovo 2015...

  • Page 8: Safety Inspection Guide

    This guide addresses only those items. You should use good judgment to identify potential safety hazards due to attachment of non-Lenovo features or options not covered by this inspection guide. If any unsafe conditions are present, you must determine how serious the apparent hazard could be and whether you can continue without first correcting the problem.

  • Page 9: Handling Devices That Are Sensitive To Electrostatic Discharge

    4. Check for cracked or bulging batteries. 5. Remove the cover. 6. Check for any obvious non-Lenovo alterations. Use good judgment as to the safety of any non-Lenovo alterations. 7. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or other liquids, or signs of fire or smoke damage.

  • Page 10: Grounding Requirements

    – Use the round ground prong of the ac plug on ac-operated computers. Grounding requirements Electrical grounding of the computer is required for operator safety and correct system function. Proper grounding of the electrical outlet can be verified by a certified electrician. Safety notices (multilingual translations) The safety notices in this section are provided in the following languages: •...
  • Page 11 DANGER DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 12 Hardware Maintenance Manual...
  • Page 13 PERIGO PERIGO PERIGO PERIGO Chapter 1 Safety information...
  • Page 14 PERIGO PERIGO PERIGO PERIGO DANGER Hardware Maintenance Manual...
  • Page 15 DANGER DANGER DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 16 DANGER VORSICHT VORSICHT VORSICHT VORSICHT Hardware Maintenance Manual...
  • Page 17 VORSICHT VORSICHT VORSICHT VORSICHT Chapter 1 Safety information...
  • Page 18 Hardware Maintenance Manual...
  • Page 19 Chapter 1 Safety information...
  • Page 20 Hardware Maintenance Manual...
  • Page 21 Chapter 1 Safety information...
  • Page 22 Hardware Maintenance Manual...
  • Page 23 Chapter 1 Safety information...
  • Page 24 Hardware Maintenance Manual...

  • Page 25: Chapter 2. Important Service Information

    Customer Support Center if they need any assistance in obtaining or installing any software fixes, drivers, and Unified Extensible Firmware Interface basic input output system (UEFI BIOS) downloads. Telephone numbers for Lenovo Support are available at: http://www.lenovo.com/support/phone • System Disassembly/Reassembly videos that show the FRU removals or replacements for the Lenovo authorized service technicians are available in the following support site: http://www.lenovoservicetraining.com/ion/...

  • Page 26: Important Notice For Replacing A System Board

    • Avoid bending a system board and hard pushing to prevent cracking at each ball-grid-array (BGA) chipset. FRU identification Use Lenovo eSupport to identify major FRUs, FRU part numbers, and FRU descriptions for a product at an MT - serial number level. Examples of major FRUs are hard disk drive, system board, liquid crystal display (LCD), and memory module.

  • Page 27: Chapter 3. General Checkout

    The following are not covered under warranty: • LCD panel cracked from the application of excessive force or from being dropped • Scratched (cosmetic) parts • Distortion, deformation, or discoloration of the cosmetic parts © Copyright Lenovo 2015...

  • Page 28: Power System Checkout

    • Plastic parts, latches, pins, or connectors that have been cracked or broken by excessive force • Damage caused by liquid spilled into the system • Damage caused by the improper insertion of a personal-computer card (PC card) or the installation of an incompatible card •...

  • Page 29: Checking The External Battery Pack And The Operational Charging

    This computer supports only batteries specially designed for this specific system and manufactured by Lenovo or an authorized builder. The system does not support unauthorized batteries or batteries designed for other systems. If an unauthorized battery or a battery designed for another systems is installed, the system will not charge.
  • Page 30 Hardware Maintenance Manual...

  • Page 31: Chapter 4. Related Service Information

    The Lenovo E4030/E4070 computers come with pre-installed OneKey Recovery System. In order to save application files and the initial backed up files of the system, the hard disk in a Lenovo computer includes a hidden partition when it is shipped. If you need to restore the system to the point of your first boot up, just enter Lenovo OneKey Recovery System and run System Recovery.

  • Page 32: Hibernation Mode

    • For Windows 8 and Windows 8.1: Move the cursor to the bottom-right corner of the screen to display the charms. Then click Settings ➙ Power ➙ Sleep. To return to normal operation, press any key. In certain circumstances, the computer goes into sleep mode automatically: •...

  • Page 33: Chapter 5. Passwords

    Chapter 5. Passwords As many as three passwords may be needed for any Lenovo computer: the power-on password (POP), the hard disk password (HDP), and the administrator password. If any of these passwords has been set, a prompt for it appears on the screen whenever the computer is turned on.
  • Page 34 Hardware Maintenance Manual...

  • Page 35: Chapter 6. Status Indicators

    Off: The battery is detached or the computer is turned off. Device access status indicator On: The hard disk drive or the optical drive is reading or writing data. Off: The computer is off or in hibernation mode. © Copyright Lenovo 2015...
  • Page 36 Hardware Maintenance Manual...

  • Page 37: Chapter 7. Function Keys

    For Windows 8.1: Opens the Settings charm. For Windows 7: Opens Windows Search. For Windows 8.1: Opens the Search charm. Views the programs that you have opened. For Windows 7: Opens Computer. For Windows 8.1: Views all the programs. © Copyright Lenovo 2015...
  • Page 38 Hardware Maintenance Manual...

  • Page 39: Chapter 8. Locations

    This topic introduces the locations of the computer controls, connectors, and indicators. Front view Touch pad Camera Camera indicator Memory card slot Microphone hole Power indicator Power button Battery status indicator Left-click button Device access status indicator Right-click button Fingerprint reader (on some models) © Copyright Lenovo 2015...

  • Page 40: Left-Side View

    Left-side view ac power connector Ethernet connector dc-in indicator HDMI-out connector Ventilation slots USB 3.0 connector VGA connector USB 3.0 connector Hardware Maintenance Manual...

  • Page 41: Right-Side View

    Right-side view Security keyhole Always On USB connector Optical drive USB 2.0 connector Novo button Combo audio jack Bottom view Battery lock Battery lock (spring loaded) Battery pack Bottom slot cover Chapter 8 Locations...

  • Page 42: Locating Frus And Crus

    CRUs, you can either install the CRU yourself or you can request that a Service Provider install the CRU according to the warranty service for your product. If you intend on installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request.

  • Page 43: Major Frus And Crus

    Major FRUs and CRUs Table 3. Major FRUs FRU descriptions Self-service Optional-service FRU No. parts LCD unit Keyboard bezel assembly Memory 11202451 M471B5674QH0-YK0 Module Memory HMT425S6AFR6A-PB 2GB DDR3L 1600 11201299 Module Memory RMT3170MK58F8F-1600 2GB DDR3L 1600 11202301 Module Memory RMT3190ME76F8F-1600 2GB 5M30G04992 Module Memory...
  • Page 44 Table 3. Major FRUs (continued) FRU descriptions Self-service Optional-service FRU No. parts Memory M471B1G73DB0-YK0 25nm 8GB DDR3L 11202082 Module 1600 Memory SK HMT41GS6BFR8A-PB/RD 8GB DDR3L 11202707 Module 1600 Memory RMT3160ME68FAF-1600 8GB DDR3L 1600 11202450 Module Memory MT16KTF1G64HZ-1G6E1 8GB DDR3L 11201304 Module 1600 Power...
  • Page 45 Table 3. Major FRUs (continued) FRU descriptions Self-service Optional-service FRU No. parts System MB C E40-80 NOK UMA 3805 G 5B20H70724 board System MB C E40-80 W8P UMA 3805 G 5B20H70641 board System MB C E40-80 W8S UMA 3805 G 5B20H70704 board 5B20H70689...
  • Page 46 Table 3. Major FRUs (continued) FRU descriptions Self-service Optional-service FRU No. parts System MB C E40-80 W8P M330 1G 5200 G 5B20H70719 board System MB C E40-80 W8S M330 1G 5200 G 5B20H70639 board System MB C E40-80 NOK M330 2G 5200 G 5B20H70757 board 5B20H70674...
  • Page 47 Table 3. Major FRUs (continued) FRU descriptions Self-service Optional-service FRU No. parts System MB C E40-80 W8S M330 2G 5500 G 5B20H70725 board System MB C E40-80 NOK UMA 5500 G 5B20H70684 board System MB C E40-80 W8P UMA 5500 G 5B20H70746 board 5B20H70665...
  • Page 48 Table 3. Major FRUs (continued) FRU descriptions Self-service Optional-service FRU No. parts LED Board: E40-30 5C50G07300 Board Lower Lower Case: E40-30 5CB0G07337 Case Hard Disk Drive: 320G 5400rpm ST320LT012 16200384 6G 7mm 5.4K 320G HDD Hard Disk Drive: 320G 5400rpm TSB 16200434 MQ01ABF032 6G 7mm 5.4K 320G HDD Hard Disk Drive: 320G 5400rpm...

  • Page 49: Lcd Frus

    Table 3. Major FRUs (continued) FRU descriptions Self-service Optional-service FRU No. parts Optical Disk Drive: HLDS GUC0N 9.0mm 5DX0F85915 Slim Tray Rambo ODD Optical Disk Drive: PLDS DA-8A6SH 9.0mm 5DX0F86404 Slim Tray Rambo ODD Optical Disk Drive: 9.0 Rambo QSI UJ8FBS 25215312 9.0 Rambo ODD ODD bezel: E4030...

  • Page 50: Miscellaneous Parts And Other Frus

    Table 4. LCD FRUs (continued) No. FRU FRU descriptions Self-service Optional-service PN number parts Hinge Hinge: C E40-30 L+R 5H50G07334 Camera camera module: C E40-30 1M 5C20G07313 module Camera camera module: C E40-30 0.3M 5C20G07312 module LCD cover: LCD Cover C E40-70 Black PAN 5CB0G97091 cover LCD cable: LCD C E40-30 W/CAM Cable UMA...
  • Page 51 Table 6. Other FRUs (continued) FRU descriptions Self-service Optional-service PN number ac adapter 65W 3pin: Liteon ADLX65NLC3A 20V3.25A 36200607 adapter Liteon ac adapter 65W 3pin: Chicony ADLX65NCC3A 20V3.25A 36200611 adapter Chicony Power code UK 3pin: LINETEK LP-61L+ H03VV-F+ LS15 1m 145000593 code 145000561...
  • Page 52 Table 6. Other FRUs (continued) FRU descriptions Self-service Optional-service PN number Power code Japan 3pin: VOLEX VAC5S+VCTF+M755 1m 145000530 code Power code Japan 3pin: lux 0018(E)+VCTF 0.75/3C+0021 145500005 1m code Power code Australia 3pin: LINETEK LS15+H03VV-F+LP-23A 145000589 1m code 145000557 Power code Australia 3pin: Longwell LP-23A+LFC-3R+LS-18 1m code 145000532...
  • Page 53 Table 6. Other FRUs (continued) FRU descriptions Self-service Optional-service PN number Power code Brazil 3pin: Longwell LP-46+H03VV-F+LS-18 1m 145000564 code Power code Brazil 3pin: VOLEX CH10S3+H03VV-F+VAC5S 145000527 1m code Power code Brazil 3pin: lux 0034+H03VV-F 0.75/3C+0011 145500011 1m code 145000595 Power code Israel 3pin: LINETEK LS15+H03VV-F+LP-41 1m code 145000563...
  • Page 54 Table 6. Other FRUs (continued) FRU descriptions Self-service Optional-service PN number Keyboard Chicony: 25215318 Thailand84KeyBoxsterCCYBlkKBlackFrame Keyboard Chicony: 25215319 Portugue85KeyBoxsterCCYBlkKBlackFrame Keyboard Chicony: 25215320 LatinSpa85KeyBoxsterCCYBlkKBlackFrame 25215321 Keyboard Chicony: CanadFrEn85KeyBoxsterCCYBlkKBlackFrame 25215322 Keyboard Chicony: Korean84KeyBoxsterCCYBlkKBlackFrame Keyboard Chicony: 25215323 TradChine84KeyBoxsterCCYBlkKBlackFrame Keyboard Chicony: 25215324 Russian84KeyBoxsterCCYBlkKBlackFrame Keyboard Chicony: French85KeyBoxsterCCYBlkKBlackFrame 25215325 25215326 Keyboard Chicony:...
  • Page 55 Table 6. Other FRUs (continued) FRU descriptions Self-service Optional-service PN number Keyboard Sunrex: Spanish85KeyBoxsterJMEBlkKBlackFrame 25215346 Keyboard Sunrex: Turkish85KeyBoxsterJMEBlkKBlackFrame 25215347 Keyboard Sunrex: Thailand84KeyBoxsterJMEBlkKBlackFrame 25215348 Keyboard Sunrex: 25215349 Portugue85KeyBoxsterJMEBlkKBlackFrame Keyboard Sunrex: 25215350 LatinSpa85KeyBoxsterJMEBlkKBlackFrame Keyboard Sunrex: 25215351 CanadFrEn85KeyBoxsterJMEBlkKBlackFrame Keyboard Sunrex: Korean84KeyBoxsterJMEBlkKBlackFrame 25215352 Keyboard Sunrex: 25215353 TradChine84KeyBoxsterJMEBlkKBlackFrame Keyboard Sunrex: Russian84KeyBoxsterJMEBlkKBlackFrame...
  • Page 56 Hardware Maintenance Manual...

  • Page 57: Chapter 9. Fru Replacement Notices

    Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request. You can find a list of CRUs for your product in this Hardware Maintenance Manual. An electronic version of this manual can be found at http://www.lenovo.com/UserManuals.
  • Page 58 180 degrees more (Cross-section) Notes: • Ensure that you use the correct screw. If you have a torque screwdriver, tighten all screws firmly to the torque specified in the screw information table for each step. • Ensure that torque screwdrivers are calibrated correctly following country specifications. Hardware Maintenance Manual...

  • Page 59: Chapter 10. Removing Or Replacing A Fru

    Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request. You can find a list of CRUs for your product in this Hardware Maintenance Manual. An electronic version of this manual can be found at http://www.lenovo.com/UserManuals.

  • Page 60: 1010 External Battery Pack

    The only exception to this is if the battery pack is physically damaged or a customer is reporting a possible safety issue. If the Lenovo Solution Center program is not installed on the computer, the customer should download and install the program to diagnose the battery pack, before getting a non-physically damaged battery pack replaced.
  • Page 61 Removal steps of the keyboard Remove two screws Step Screw (quantity) Color Torque M2.0 × 6mm, flat-head, nylok-coated (2) Black 1.5 – 2.0 kgfcm Lift the keyboard a little by its upper edge with a flat blade , and then slide the keyboard frame forward in the direction shown by arrow Chapter 10 Removing or replacing a FRU...

  • Page 62: 1030 Optical Disk Drive

    Lift the keyboard a little , and then detach the connector in the direction shown by arrows When installing Make sure that the connector is firmly attached. 1030 Optical disk drive For access, remove these FRUs in order: • “1010 External battery pack” on page 54 Removal steps of the Optical drive Remove the screw Step...

  • Page 63: 1040 Base Cover Assembly

    Insert a screwdriver into the screw hold and push the optical driver in the direction shown by arrow . Pull the optical drive out in the direction shown by arrow Remove the ODD bezel . Loosen two screws and then detach the ODD bracket Torque Step Screw (quantity)

  • Page 64: 1050 Hard Disk Drive Or Solid-State Hybrid Drive

    Step Screw (quantity) Color Torque Black SCREW M2.5*6mm, flat-head, nylok-coated (2) 2.0– 2.5 kgfcm Applying labels to the base cover assembly: The new base cover assembly is shipped with a kit containing labels of several kinds. Apply those labels when you replace the base cover assembly. For the labels that are not shipped with the new base cover assembly, peel them from the old base cover assembly, and adhere them to the new one.
  • Page 65 Removal steps of the hard disk drive or the solid-state drive Remove the screws Step Screw (quantity) Color Torque M2.5 × 6mm, flat-head, nylon-coated (2) Black 2.0– 2.5 kgfcm Slide the hard disk drive in the direction shown by arrow Pull the hard disk drive out Chapter 10 Removing or replacing a FRU...

  • Page 66: 1060 Wireless-Lan /Bluetooth Card

    Detach the bracket by removing the four screws Step Screw (quantity) Color Torque M3 × 3mm, flat-head, nylon-coated (4) Black 2.5– 3.0 kgfcm When installing: Ensure that the hard disk drive or solid-state hybrid drive is firmly attached. 1060 Wireless-LAN /Bluetooth card For access, remove these FRUs in order: •...

  • Page 67: 1070 Memory Module

    Remove the card in the direction shown by arrow When installing: 1. In models with a wireless LAN card that has two antenna connectors, plug the black cable (1st) (MAIN) into the jack labeled MAIN or 1 on the card, and the white cable (2nd) (AUX) into jack labeled AUX or 2 on the card.

  • Page 68: 1080 Upper Case

    1080 Upper case For access, remove these FRUs in order: • “1010 External battery pack” on page 54 • “1020 Keyboard” on page 54 • “1030 Optical disk drive” on page 56 • “1040 Base cover assembly” on page 57 •...

  • Page 69: 1090 Audio Board, Audio Board Cable, Power Board, Touch Pad Board Cable, Finger Printer Board And Led Board

    Detach power board connector, LED board connector , touch pad connector and finger print reader connector in the direction shown by arrows When installing: Ensure that all the connectors are attached firmly. Remove the upper case in the direction shown by arrow 1090 Audio board, audio board cable, power board, touch pad board cable, finger printer board and LED board For access, remove these FRUs in order:...
  • Page 70 • “1050 Hard disk drive or solid-state hybrid drive” on page 58 • “1060 Wireless-LAN /Bluetooth card” on page 60 • “1080 Upper case” on page 62 Removal steps of audio board and audio board cable Detach Audio board cable connector .
  • Page 71 Detach the connector , and then remove the touch pad board cable in the direction shown by arrow When installing: make sure that the touch pad board cable connector is firmly attached. Remove one screw , and then remove the finger printer bracket in the direction shown by arrow Step Screw (quantity) Color...

  • Page 72: 1100 System Board

    Push forward the LED board and remove it in the direction shown by arrow 1100 System board Important notices for handling the system board When handling the system board, read the following: • Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite.
  • Page 73 Removal steps of the system board Detach EDP cable connector Remove one screw and three screws Step Screw (quantity) Color Torque M2 × 5mm, flat-headed, nylon-coated (1) Silver 1.7– 2.0 kgfcm M2.5 × 6mm, flat-headed, nylon-coated (3) Black 2.0– 2.5 kgfcm Chapter 10 Removing or replacing a FRU...

  • Page 74: 1110 Thermal Fan Assembly And Heat Sink Assembly

    Unplug DC-in cable connector When installing: Ensure that the connectors are attached firmly. Remove the system board in the direction shown by arrow When installing: When attaching the system board to the base cover, adjust the placement of the USB ports as shown in , and make sure that they are attached to the holes on the base cover as shown.
  • Page 75 • “1030 Optical disk drive” on page 56 • “1040 Base cover assembly” on page 57 • “1050 Hard disk drive or solid-state hybrid drive” on page 58 • “1060 Wireless-LAN /Bluetooth card” on page 60 • “1080 Upper case” on page 62 •...

  • Page 76: 1120 Speaker Assembly

    Unplug the fan connector in the direction shown by arrow When installing: Ensure that the fan connector is attached firmly. Remove the thermal fan assembly in the direction shown by arrow 1120 Speaker assembly For access, remove these FRUs in order: •...

  • Page 77: 1130 Lcd Unit And Dc-In Cable

    Removal steps of the speaker assembly Release antenna and LVDS cables from the cable guide, loosen four screws and remove the speakers Step Screw (quantity) Color Torque Black 1.0– 1.5 kgfcm M2 × 3mm, big head, nylon-coated (4) Attention: As you route the cables, ensure that they are not subject to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken.
  • Page 78 Removal steps of the LCD unit and DC-in cable Release the antenna cables from the cable guide , and then remove two screws and two screws Step Screw (quantity) Color Torque Black 2.0– 2.5 kgfcm M2.5 × 6mm, flat-headed, nylon-coated (2) M2.5 ×...

  • Page 79: 1140 Lcd Front Bezel

    Detach the LCD unit from the upper case Remove the DC-in cable 1140 LCD front bezel For access, remove this FRU: • “1010 External battery pack” on page 54 • “1020 Keyboard” on page 54 • “1030 Optical disk drive” on page 56 •...

  • Page 80: 1150 Lcd Panel And Hinges

    Removal steps of the LCD front bezel Remove the covers , and then remove two screws Torque Step Screw (quantity) Color M2.5 × 4mm, flat-headed, nylon-coated (2) Silver 2.0– 2.5 kgfcm Remove the LCD front bezel in the direction shown by arrow 1150 LCD panel and hinges For access, remove these FRUs in order: •...

  • Page 81: 1160 Integrated Camera And Lcd Cable

    Removal steps of the LCD panel and hinges Disconnect the EDP cable connector When installing: Ensure that the connector is attached firmly. Remove four screws and then remove the LCD panel Step Screw (quantity) Color Torque Black M2.5 × 4mm, flat-headed, nylon-coated (4) 2.0–...

  • Page 82: 1170 Antenna Assembly And Lcd Cover

    • “1090 Audio board, audio board cable, power board, touch pad board cable, finger printer board and LED board” on page 63 • “1100 System board” on page 66 • “1120 Speaker assembly” on page 70 • “1130 LCD unit and DC-in cable” on page 71 •...
  • Page 83 When installing: Route the antenna cables along the cable guides and secure the antenna boards with adhesive tapes. As you route the cables, make sure that they are not subjected to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken. Chapter 10 Removing or replacing a FRU...
  • Page 84 Hardware Maintenance Manual...

  • Page 85: Appendix A. Notices

    Lenovo representative for information on the products and services currently available in your area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service that does not infringe any Lenovo intellectual property right may be used instead.

  • Page 86: Electronic Emissions Notices

    User Guide. EU contact: Lenovo, Einsteinova 21, 851 01 Bratislava, Slovakia Trademarks The following terms are trademarks of Lenovo in the United States, other countries or both: Lenovo OneKey Microsoft, Windows, and Windows Server are trademarks of the Microsoft group of companies.

  • Page 87: Appendix B. Abbreviation Table

    ICCID integrate circuit card identity International Standardization Organization local area network liquid crystal display media access control machine type machine type and model personal computer Platform Controller Hub POST power-on self-test random-access memory © Copyright Lenovo 2015...
  • Page 88 Abbreviation Term radio frequency RFID radio-frequency identification ring indicator registered jack SATA Serial Advanced Technology Attachment subscriber identity module supervisor password TFTs thin-film transistors UEFI Unified Extensible Firmware Interface Universal Serial Bus UUID universally unique identifier video graphics array VRAM video random-access memory wide area network Hardware Maintenance Manual...

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