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Lenovo N42-20 Chromebook Hardware Maintenance Manual
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Lenovo N42-20 Chromebook Hardware Maintenance Manual

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Hardware Maintenance Manual
Lenovo N42–20 Chromebook

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Summary of Contents for Lenovo N42-20 Chromebook

  • Page 1 Hardware Maintenance Manual Lenovo N42–20 Chromebook...
  • Page 3 Hardware Maintenance Manual Lenovo N42–20 Chromebook...
  • Page 4 First Edition (June 2016) © Copyright Lenovo 2016.

  • Page 5: Table Of Contents

    Remove the hinges ... Checking the ac power adapter ..Appendix A. Lenovo part numbers for Chapter 3. Idetifying FRUs (CRUs) . . 21 replacement FRUs .
  • Page 6 Hardware Maintenance Manual...

  • Page 7: Chapter 1. Safety Information

    • Do not work alone under hazardous conditions or near equipment that has hazardous voltages. • Disconnect all power before: – Performing a mechanical inspection – Working near power supplies © Copyright Lenovo 2016...

  • 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

    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 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 DANGER Hardware Maintenance Manual...
  • Page 15 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. General Checkout

    • Scratched (cosmetic) parts • Distortion, deformation, or discoloration of the cosmetic parts • Plastic parts, latches, pins, or connectors that have been cracked or broken by excessive force • Damage caused by liquid spilled into the system © Copyright Lenovo 2016...

  • Page 26: Checking The Ac Power Adapter

    • Damage caused by the improper insertion of a personal-computer card (PC card) or the installation of an incompatible card • Improper disc insertion or use of an external optical drive • Fuses blown by attachment of a non-supported device •...

  • Page 27: Chapter 3. Idetifying Frus (Crus)

    The exploded illustrations help Lenovo service technicians identify FRUs or CRUs that they may need to replace when servicing a customer’s computer. Refer to Appendix A “Lenovo part numbers for replacement FRUs” on page 37 if you need to look up Lenovo part numbers for a particular FRU or CRU.
  • Page 28 Table 1. FRU (CRU) categories FRU (CRU) category LCD module Upper case (with keyboard) Battery pack Speakers Heatsink System board WLAN & Bluetooth combo module DC-in cable USB board Base cover Figure 2. LCD module — exploded view Table 2. FRU categories for the LCD module FRU (CRU) category LCD bezel LCD bracket...
  • Page 29 Table 2. FRU categories for the LCD module (continued) Hinges LCD cable Camera assembly LCD base cover Chapter 3 Idetifying FRUs (CRUs)
  • Page 30 Hardware Maintenance Manual...

  • Page 31: Chapter 4. Removing A Fru Or Cru

    5. To install a new FRU in place, perform the removal procedure in reverse and follow any notes that pertain to replacement. 6. When replacing a FRU, carefully retain and reuse all screws. If screws are missing, look up the Lenovo parts numbers in Appendix B “Lenovo part numbers for CRUs and miscellaneous parts” on page 39 for replacement screws and order them through the Lenovo CRM system.

  • Page 32: Remove The Battery Pack

    Open the keyboard and touch pad sockets, detach the cables, and pull up the upper case. Refer to Table 12 “Part numbers for FRUs (CRUs)” on page 37 to look up the Lenovo part numbers for the following replacement parts:...

  • Page 33: Remove The Speakers

    1.85 +/- to base 0.15kgf*cm cover Refer to Table 12 “Part numbers for FRUs (CRUs)” on page 37 to look up the Lenovo part numbers of the following replacement parts: Battery pack Remove the speakers Make sure the following FRUs (CRUs) have been removed.

  • Page 34: Remove The Usb Board

    Step 2. Carefully remove the speakers off the piles. Refer to Table 12 “Part numbers for FRUs (CRUs)” on page 37 to look up the Lenovo part numbers of replacement speakers. Remove the USB board Make sure the following FRUs (CRUs) have been removed: “Remove the upper case (with keyboard)”...

  • Page 35: Remove The Wlan & Bluetooth Combo Module

    Pull out the WLAN & Bluetooth combo module in the direction shown by the arrow Figure 10. Pull out the WLAN & Bluetooth combo module Refer to Table 12 “Part numbers for FRUs (CRUs)” on page 37 to look up the Lenovo part numbers of replacement WLAN & Bluetooth combo modules.

  • Page 36: Remove The System Board And The Dc-In Cable

    Step 1. Unplug the LCD cable. Figure 11. Remove 4 screws Step 2. Remove the screws. Step 3. Lift up the LCD module to detach it from the base cover. Table 7. Screw specifications — removing the LCD module Screw Number Specifications Torque...
  • Page 37 Figure 12. Unplug the DC-in cable Step 2. Remove the screws and take out the system board. Table 8. Screw specifications — removing the LCD module Screw Screw Specifications Color Torque location used system M2 ×3 mm, flat-head, nylon-coated Black 1.85 +/- board 0.15kgf-cm...

  • Page 38: Disassemble The Lcd Module

    Figure 14. Remove the DC-in cable Refer to Table 12 “Part numbers for FRUs (CRUs)” on page 37 to look up the Lenovo part numbers of the following replacement parts: System board DC-in cable Base cover Disassemble the LCD module The LCD module as a whole is not a FRU.

  • Page 39: Remove The Lcd Panel

    Step 4. Remove the LCD bezel. Refer to Table 13 “Part numbers for LCD FRUs” on page 38 to look up the Lenovo part numbers for the replacement LCD bezel. Remove the LCD panel Make sure the following FRUs (or CRUs) have been removed.

  • Page 40: Remove The Camera Assembly Or The Lcd & Camera Cable

    Figure 19. Disconnect the LCD cable from the back of the LCD panel Step 3. Remove the LCD panel. Refer to Table 13 “Part numbers for LCD FRUs” on page 38 to look up the Lenovo part numbers for replacement LCD panels. Remove the camera assembly or the LCD & camera cable Make sure the following FRUs (or CRUs) have been removed.

  • Page 41: Remove The Hinges

    Figure 20. Unplug camera cable Step 2. Remove the camera. Refer to Table 13 “Part numbers for LCD FRUs” on page 38 to look up the Lenovo part numbers for replacement parts for: Camera assembly LCD & camera cable Remove the hinges Make sure the following FRUs (or CRUs) have been removed.
  • Page 42 Hardware Maintenance Manual...

  • Page 43: Appendix A. Lenovo Part Numbers For Replacement Frus

    Appendix A. Lenovo part numbers for replacement FRUs When servicing a customer’s computer, Lenovo service technicians may use part numbers listed in the following tables to order replacement parts through Lenovo CRM (customer relationship management) system. Table 12. Part numbers for FRUs (CRUs) No.
  • Page 44 Lower Cover Q 80US BLACK 5CB0L85357 Note: Refer to Appendix B “Lenovo part numbers for CRUs and miscellaneous parts” on page 39 to look up the Lenovo part numbers of ac power adapters and power cords. Table 13. Part numbers for LCD FRUs No.

  • Page 45: Appendix B. Lenovo Part Numbers For Crus And Miscellaneous Parts

    Appendix B. Lenovo part numbers for CRUs and miscellaneous parts The power cords and ac adapters are CRUs. Table 14. Part numbers for FRUs (CRUs) CRU category Parts description Lenovo part number Screw pack Screw Pack Q 80US SCREW KIT...
  • Page 46 Table 14. Part numbers for FRUs (CRUs) (continued) 145000559 Longwell LP-22+H03VV-F+LS-18 1米电源线 145000558 Longwell LP-486+KTLH03VV-F+LS-5 1米电源线 145000557 Longwell LP-23A+LFC-3R+LS-18 1米电源线 145000556 Longwell LP-71+VCTF+LS-33 1米电源线 145000555 Longwell LP-54+VCTF+LS-18 1米电源线 145000554 Longwell LP-39+H03VV-F+LS-18 1米电源线 145000553 Longwell LP-34A+H03VV-F+LS-18 1米电源线 145000538 VOLEX GB10S3+RVV 300/500+VAC5S 1米电源线 145000537 Volex US15S3+SPT-2 ＋VAC5S 1米电源线...
  • Page 47 Table 14. Part numbers for FRUs (CRUs) (continued) 145500010 lux 0044+H03VV-F 0.75/3C+0011 1米电源线 145500001 lux 0033+H03VV-F 0.75/3C+0011 1米电源线 Appendix B. Lenovo part numbers for CRUs and miscellaneous parts...
  • Page 48 Hardware Maintenance Manual...

  • Page 49: Appendix C. Label Locations

    15 mm x 10 mm Korea 35 mm x 12 mm Korea KCC label Indonesia WLAN label Indonesia 32 mm x 10 mm Indonesia rating label Indonesia 32 mm x 10 mm Israel label Israel 32 mm x 10 mm © Copyright Lenovo 2016...
  • Page 50 Hardware Maintenance Manual...

  • Page 51: Trademarks

    Trademarks Lenovo and the “lenovo” logo are trademarks of Lenovo in the United States, other countries or both: Other company, product, or service names may be trademarks or service marks of others.

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