HP (Hewlett-Packard)メーカーA6Y11UAR#ABAの使用説明書/サービス説明書
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HP Pavilion g4 Notebook PC Maintenance and Service Guide.
© Copyright 2012 Hew lett-Packard Development Company, L.P. AMD is a trademark of Advanced Micro Devices, Inc. Bluetooth is a trademark owned by its proprietor and used by Hewlett-Packard Company under license. Intel, Centrino, Core, and Pentium are trademarks of Intel Corporation in the U .
Safety warning notice WARNING! To reduce the possibility of heat-related in juries or of ove rheating th e device, do not place the device dire ctly on your lap or obstr uct th e device air vents.
iv Safety warning no tice.
Table of contents 1 Product description ............ ......... ........... ......... ......... .......... .......... ........... ........ ............ ... ............. ........ ......... .. 1 2 External component id enti fication ...... ......... ...
Optical drive .................... ........ ........... ........... ......... .......... ........... .......... ......... ............ .. ...... 33 Hard d rive ........ ......... ........... .......... ........... .......... ............ ......... ...
BD ROM DV D±R/RW Su per Mult i Double-L ayer Dri ve spec ifications .................... ........................ ... 82 7 Backin g up, re storin g, and rec overing ... ........... ............ ............. ............ ............ ........... ....
viii.
1 Product description Category Description Product Name HP Pavilion g4 Notebook PC Processors 2nd Generation Intel® Core TM processors: Intel Core i5-2450M processor (2.50 GHz, SC turbo up to 3.10 GHz, 1333 MHz/ 3.0 MB L3 cache, dual core, 35 W) Intel Core i3-2350M processor (2.
Category Description Hard drives Supports 6.35 cm (2.5 in) hard drives in 9.5 mm (.37 in) and 7.0 mm (.28 in) thicknesses Customer-accessible Serial ATA (SATA) Supports HP 3D Drive Guard Supports the following single ha rd drive configurations: ● 1 TB, 5400 rpm, 9.
Category Description Support for the following WLAN formats: ● Atheros 9485GN 802.11b/g/n 1×1 WiFi Adapter and 301 2 Bluetooth 4.0 Combo Adapter (select models only) ● Atheros HB125 802.11b/g/n 1×1 WiFi Adapter ( select models only) ● Broadcom 4313GN 802.
Category Description Support for the following b atteries: ● 6 cell, 2.20 Ah (47 Wh) Li-ion battery ● 6 cell, 2.55 Ah (55 Wh) Li-ion battery (select models only) Supports fast charge Security Secu.
2 External component identification Display Item Component Description (1) WLAN antennas (2)* Send and receive wireless sign als to communicate with WLAN devices. (2) Internal microphone Records sound. (3) Webcam Records video and captures still photographs.
Top Buttons and speakers Component Description (1) Power button ● When the computer is off, press the button to turn on the computer. ● When the computer is on, press the button briefly to initiate Sleep. ● When the computer is in the Sleep state, press the button briefly to exit Sleep.
Keys Component Description (1) esc key Displays system information when pressed in combination with the fn key. (2) fn key Displays system information when pressed in combination with the esc key. (3) Operating system logo key Displays the operating system menu.
Lights Component Description (1) Power light ● White: The computer is o n. ● Blinking white: The computer is in the Sleep state, which is an energy-saving mode. The comp uter shuts off power to the display and other unneeded components. ● Off: The computer is off or in Hibernation.
TouchPad Component Description (1) TouchPad on/off button Turns the TouchPad on or off. (2) TouchPad light ● Amber: The TouchPad is off. ● Off: The TouchPad is on. (3) TouchPad zone Moves the on-screen pointer and selects or activates items on the s creen.
Left side Component Description (1) External monitor port Connects an ex ternal VGA monitor or projector . (2) Vents (2) Enable airflow to cool internal components. NOTE: The computer fan starts up automatically to cool internal components and prevent over heating.
Right side Component Description (1) Optical drive Reads and writes to an optical disc. (2) Optical drive light ● Green or amber: The optical drive is being a ccessed. ● Off: The optical drive is idle. (3) Optical drive eject button Releases the disc tray.
Bottom components Component Description (1) Battery bay Holds the battery. (2) Battery release latch Releases the battery from the battery bay. (3) Vents (5) Enable airflow to cool internal components. NOTE: The computer fan starts up automatically to cool internal components and prevent overheating.
3 Illustrated parts catalog Service label When ordering pa rts or requestin g information, provide the comput er serial numbe r and model description pro vided on the service label. Item Description Function (1) Product name This is the model name for the computer.
Computer major components 14 Chapter 3 Illustrated parts catalo g.
Item Component Spare part number (1) 35.6 cm (14.0 in), high d efinition (HD), LED, Bright View display assembly (includes webca m, microphone, wireless antenna transceivers and cable, and display cab.
Item Component Spare part number (10) Processor (includes replaceme nt thermal material): ● Intel Core i5-2450M processor (2.50 GHz, SC turbo up to 3.10 GHz, 1 333 MHz/3.0 MB L3 cache, dual core, 3 5 W) 676359-001 ● Intel Core i3-2350M processor (2.
Item Component Spare part number ● 4 GB 641369-001 ● 2 GB 652972-001 (20) WLAN module: ● Atheros 9485GN 802.11b/g/n 1×1 WiFi Adapter and 3012 Bluetooth 4.0 Combo Adapter (select models only) 655795-001 ● Atheros HB125 802.11b/g/n 1×1 WiFi Adapter (select models only) 675794-001 ● Broadcom 4313GN 802.
Display assembly subcomponents Item Component Spare part number (1) Displ ay bezel 680545-001 (2) Webcam/microphone module 680577-001 (3) Displ ay Hinge Kit (includes left and right displa y hinges and br ackets) 680554-001 (4) 35.
Mass storage devices Item Component Spare part number (1) Opt ical d rive (inclu des bezel and bracket): ● Blu-ray ROM DVD±R /RW Super Multi Double-Layer Drive 680557-001 ● DVD±RW Super Multi Double-Layer Combo Drive 680556-001 (2) Hard dr ive SATA, does not include hard drive bumpers, bracket, or cable: 9.
Miscellaneous parts Componen t Spare part number HP Smart AC adapter ● 90 W HP Smart AC adapter with Power Factor Corr ection (PFC) (for computer models equipped with a graphics subsystem with discr.
Spare part number Description 490371-AA1 Power cord for use in the People's Republic of China (black, 3 in, 1.83 m) 490371-AB1 Power cord for use in Taiwan (black, 3 in, 1.83 m) 490371-AD1 Power cord for use in South Korea (black, 3 in, 1.83 m) 490371-D01 Power cord for use in Argentina (black, 3 in, 1.
Spare part number Description 669299-001 500 GB, 5400 rpm hard drive (9.5 mm (0.37 in) × 6.35 cm (2.50 in) SATA, does not include hard drive bumpers, bracket, or cable) 669300-001 640 GB, 5400 rpm hard drive (9.
Spare part number Description 680557-001 Blu-ray ROM DVD±R/RW Super Multi D ouble-Layer Dr ive (incl udes bezel and bracket) 680558-001 USB board (includes cable) 680559-001 TouchPad button board (includes cable) 680560-001 Power button board (includes cable) 680561-001 Plastics Kit (includes service door) 680562-001 35.
4 Removal and replacement procedures Preliminary replacement requirements Tools required You will need the following tools to comple te the removal and re placement procedures: ● Flat-bla ded screw .
Drive handling CAUTION: Drives are fragile components that must be handle d with care. To prevent damage to the computer, damage to a d rive, or loss of information, observe these precau tions: Before removing or inserting a hard dri ve, shut down the computer.
Typical electrostatic voltage levels Relative hum idity Event 10% 40% 55% Walking across carpet 35,000 V 15,000 V 7,500 V Walking across vinyl floor 12,000 V 5,000 V 3,000 V Motions of bench worker 6,.
Packaging and transporting guidelines Follow these groun ding guidelines whe n packaging and transporti ng equipment: ● To avoid hand contact, transport products in static-safe tubes, bags, or boxes. ● Protect ESD-sensitive parts an d assemblies wi th conductive or approv ed containe rs or packaging.
Equipment guidelines Grounding equi pment must include eith er a wrist strap o r a foot strap at a grou nded workstation. ● When seated, wear a wrist strap connected to a grounded system. Wrist straps are flexible straps with a minimu m of one megohm ±1 0% resi stance in the ground cords.
Service label When ordering pa rts or requestin g information, provide the comput er serial numbe r and model number provided on the service la bel. Item Description Function (1) Product name The name affixed to the front of the compute r. (2) Serial number (s/n) This is an alphanum eric identifier that is unique to each product.
Computer feet Description Spare part number Rubber feet kit 680563-001 The computer feet a re adhesive-backe d rubber pads. There are 4 rubber feet that att ach to the base enclosure in the locations illustrated below.
Battery Description Spare part number 6-cell, 55-Whr, 2.55-Ah Li- ion battery 593554-001 6-cell, 47-Whr, 2.20-Ah Li- ion battery 593553-001 Before disa ssembling the co mputer, follow these steps: 1.
Service door Description Spare part nu mber Plastics Kit (contains the service door) 680561-001 Before removing the service door, remove the battery (see Battery on page 31 ). 1. Using a small Phillips screwdriver , loosen the service door screw (1) .
Optical drive NOTE: The optical drive spare part ki t includes a bezel an d bracket. Description Spare part number Blu-ray ROM DVD±R/RW Super Multi Double-Layer Drive 680557-001 DVD±RW and CD-RW Super Multi Double-Layer Combo Drive 680556-001 Before removing the optical drive, follow these ste ps: 1.
3. Pull the optical drive (3) out from the front until the optical drive is co mp letely removed from the computer. 4. Remove the two Phillip s M2.0 x 3.0 screws (1) that secure the optica l drive bracket t o the optical drive and then remo ve the bracket (2) from th e optical drive.
5. Insert a straightene d paper clip (1) into the release access op ening in the bezel. 6. Press the rel ease tab (2) and remove the bezel from the t ab side (3) . 7. Remove the bezel (4) from the optical drive. Reverse this procedure to rea ssemble an d install the optical drive.
Hard dr ive NOTE: If your replacement hard drive was shipped with out an operat ing system installed, you will need to install it using the system recovery di scs.
2. Lift the hard drive (2) to remove. 3. Disconnec t the hard drive cable (1) . Remove the front bumper (2) and back bumper (3) . 4. Remove the four Philli ps M3.0×3 .5 screws (4) , and then remove the bracket (5) from the hard drive. Replacing a hard drive To install a hard drive, reverse the remo val procedure.
After the setup has been co mpleted, reinstall any ap plications and restore a ny data that you backed up. If you need furthe r assistance, call 1-800-474 -6836 (1 800-HP Invent).
To add or replace a memory module: 1. Spread the retention clips (1) on each side of the memory module slot to rele ase the memory module. (The memory mo dule tilts up.) 2. Remove the memory module (2) by pulling it away from the slot a t an angle. CAUTION: T o prevent damage to the memory module, ho ld the memory module by the edges only.
5. Gently press the memory module (3) down, applyi ng pressure to both the left and right edge s of the module, until the retentio n clips snap into p lace.
WLAN module Description Spare part number Atheros 9485GN 802.11b/g/n 1×1 WiFi Adapter and 3 012 Bluetooth 4.0 Combo Adapter (select models only) 655795-001 Atheros HB125 802.11b/g/n 1×1 WiFi A dapter (select models o nly) 675794-001 Broadcom 4313GN 802.
3. Remove the WLAN modu le by pulling the module awa y from the slot at an a ngle (3) . NOTE: The WLAN module is designe d with a notc h to prevent incorrec t installation into the WLAN module socke t. Reverse this procedure to insta ll the WLAN module.
Keyboard NOTE: The keyboard spare part kit inclu des a keyboard cable. Description Spare part nu mber Black keyboard For use in Brazil 680555-201 For use in Canada 680555-DB1 For use in India 680555-D.
Remove the keyboard: 1. Remove the Phillips M2.5×6.5 screw that secu res the keyboard to the computer. 2. Turn the compute r right-side up wi th the front toward you an d open the display.
6. Lift the rear ed ge (1) of the keyboa rd , and then mov e the keyboard (2) toward the display panel. 7. Tilt the keyboard forward (1) onto the palm rest. Release the zero insertion force (ZIF) connec tor (2) to which the keybo ard cable is attached, and then disconnect th e keyboard cable (3) from the system board.
Top cover NOTE: The top cover spare pa rt kit includes the TouchPa d. Description Spare part number Ruby Red 680574-001 Sparkling Black 680576-001 Winter Blue 680575-001 Before removing the top cover, follow these steps: 1.
Remove th e top cov er: 1. Disconnect these cables from the system board: (1) Power button board Z IF cable (2) Speaker ca ble (3) TouchPad button board ZIF cable 2. Remove the following scre ws under the ke yboard: (1) Three Phillips M2.5 x 3.0 (2) Three Phillips M2.
5. Remove the following scre ws that se cure the top cover to the computer: (1) Two Phillips M2.5 x 7.5 (2) Five Phillips M2.5 x 6.5 6. Turn the computer right-side up, with the front toward you. 7. Open the computer. 8. Lift the front edge of the top cover (1) until the le ft and right sides di sengage from the base en closure.
Speakers Description Spare part number Speaker Kit (includes left and right spe akers and cable) 680567-001 Before removing the speakers, follow th ese steps: 1. Shut down the co mputer. If you are unsure whether th e computer is off or in Hibern ation, turn the computer on, and th en shut it down thr ough the operating system.
Power button board Description Spare part number Power button board (includes cable) 680560-001 Before removing the power button board, follow th ese steps: 1. Shut down the co mputer. If you are unsure whether th e computer is off or in Hibern ation, turn the computer on, and th en shut it down thr ough the operating system.
TouchPad button board Description Spare part number TouchPad button board (includes cable) 680559-001 Before removing the Touch Pad butt on board, follow these ste ps: 1. Shut down the co mputer. If you are unsure whether th e computer is off or in Hibern ation, turn the computer on, and th en shut it down thr ough the operating system.
5. Lift the TouchPad button board (4) slightly to perform the next step. 6. Carefully invert the TouchP ad button board (1) . 7. Release the ZIF conne ctor to which th e TouchP ad LED board cable is connected, and then disconnect the TouchPad L ED board cable (2) from the TouchPad button board.
Before removing the TouchPad LED bo ard, follow these steps: 1. Shut down the co mputer. If you are unsure whether th e computer is off or in Hibern ation, turn the computer on, and th en shut it down thr ough the operating system. 2. Disconnect all ext ernal devices connected to the computer.
Display assembly NOTE: The display assembly spare part kit includes webcam, two microphon es, and wireless antenna transceivers a nd cables. Description Spare part number 35.
2. Release the wireless an tenna cables (2) from th e clips and the opening in the base enclosure. NOTE: It may be nece ssary to release th e USB board ZIF cable to remove the wireless antenna cables. CAUTION: Su pport the displa y assembly when removin g the following screws.
5. If it is necessary to replace the display beze l or any of the display assembly subcomponents: a. Remove the plastic screw covers (1) and the two Phill ips M2.
b. Disconnect the webc am/microphone cable (2) from the webcam/microphone modu le. c. Remove the webcam/microphone module. The webcam/microp hone module is available using spare part number 680577-001. 7. If it is necessary to replace the hinge covers, to remove the display ca ble, or to r emove th e antenna cables: a.
8. If it is necessary to replace the display panel: a. Remove the four bottom Phillips M2.5 × 3.5 screws and the two top Phillips M2.5 × 2.5 screws that secure the display pane l to the display enclos ure. b. Lift the top edge o f the display enclosure, (1) and then swing it up and forward until it is perpendicular to the display panel.
c. Release the adhesive stri p (2) that secures the display panel cable to the display panel, and then disconnect the disp lay panel cable (3) from the display pan el. d. Remove the display pane l. The display pan el cable is av ailable using spare p art number 680547-001.
b. Remove the display hinge s (2) . The display hin ges include the display hinges and brackets and are availa ble using spare p art number 680554 -001. 10. If it is necessary to replace the di splay panel cable: a. Release the tabs (1) built into the display enclosure sh ie lding that secure the displ ay panel cable to the displa y enclosure.
11. If it is necessary to replace the wi reless antenna cable s and transceivers: a. Release the wireless antenna cabl es from the clips (1) built into the display enclosure. b. Release the wireless antenna transceivers (2) from the display enclosure.
Remove the optical dr ive cable: 1. Disconnec t the optical drive ca ble (1) from the system board . 2. Release the optic a l drive cable (2) from the clips built into the base enclosure. 3. Release the optical drive c onnector from the ba se enclosure by pryi ng the clips (3) that secure the optical drive conne ctor to the base enclosure.
USB board Description Spare part number USB boar d (includes cable) 680558-001 Before removing the USB board, follow these ste ps: 1. Shut down the co mputer. If you are unsure whether th e computer is off or in Hibern ation, turn the computer on, and th en shut it down thr ough the operating system.
Power connector cable Description Spare part number Power connector cable 680548-001 Before removing the power connecto r cable, follow th ese steps: 1. Shut down the co mputer. If you are unsure whether th e computer is off or in Hibern ation, turn the computer on, and th en shut it down thr ough the operating system.
System board NOTE: The system board thermal p ad kit, part number 680 571-001, includes replacemen t thermal material. Description Spare part number For use only with computer models equipped with UMA.
Remove the system bo ard: 1. Disconnect the following cables from the system board: (1) Display panel cabl e (2) optical drive cable (3) USB board cable (4) Power connecto r cable 2. Remove the Phillips M2 .5 × 4.5 screw (1) that secure s the system board to th e base enclosure.
RTC battery Description Spare part number RTC battery (includes ca ble and doub le-side d tape) 637193-001 Before r emoving th e RTC bat tery, foll ow these s teps: 1. Shut down the co mputer. If you are unsure whether th e computer is off or in Hibern ation, turn the computer on, and th en shut it down thr ough the operating system.
Fan and heat sink NOTE: The fan and heat sink sp are part kits include re placement thermal material. Description Spare part number Fan 680551-001 Heat sink for use only with computer models equipped .
4. Remove the fan and heat sink (4) . NOTE: The thermal mate rial must be thoroughly clean ed from the surfaces of the heat sink and the system board co mponents each ti me the heat sink is remove d. Replacement thermal material is included with the base enc losure, heat sink, pr ocessor, and system board spare part ki ts.
3. Disengage the two clips that secure the fan to th e heat sink and remove the heat sink (2) from the fan. Reverse this procedure to rea ssemble an d install the fan and heat si nk.
PCH heat sink Description Spare part number PCH heat sink 683843-001 Before removing the PCH heat sink, follow these steps: 1. Shut down the co mputer. If you are unsure whether th e computer is off or in Hibern ation, turn the computer on, and th en shut it down thr ough the operating system.
2. Remove the PCH heat sink by lifting straight up (2) . NOTE: Due to the adhe sive quality of the th ermal material located b etween the heat sink a nd system board components, it may be necessary to move the heat sink fr om side to sid e to detach it.
4. Remove the batt ery (see Battery on page 31 ). 5. Remove the service door (see Service door on page 32 ). 6. Remove the optical drive (see Optical driv e on page 33 ). 7. Remove the ha rd drive (see Hard driv e on page 36 ). 8. Remove the keyboard (see Keyboard on page 43 ).
5 Setup Utility (BIOS) and System Diagnostics Using Setup Utility Setup Utility, or Basic In put/Output System (BIOS), controls co mmunication between all the input and output devices on the system (such as disk drives , display, keyboard, mous e, and printer).
Navigating and selectin g in Setup Utility To navigate and select in Setu p Util ity, follow these steps: 1. Turn on or restart the compu ter, and then press esc while the “Press the ESC key for Startup Menu” message is displayed at the bottom of th e screen.
Restoring factory settings in Setup Utility NOTE: Restoring defaults will not change the hard drive mode. To return all settings in Setup Ut ility to the values that were set at the fact ory, follow these steps: 1.
Determining the BIOS version To determine whether available BIO S updates c ontai n later BIOS versions tha n those currently installed on the computer, you need to know the version of the system BIOS currently installed.
4. Double-click the file that has an .e xe extension (for example, filename.exe ). The BIOS instal lation begins. 5. Complete the installation by foll owi ng the on-screen instructions. NOTE: After a message on the screen rep orts a successful installati on , you can delete the downloaded file f rom your hard drive.
6 Specifications Computer specifications Metric U.S. Dimensions: Width 34.7 cm 13.67 in Depth 23.1 cm 9.10 in Height (front to back) 3.0 cm to 3.6 cm 1.9 in to 1.4 in Weight: 2.20 kg 4.9 lbs Input power Operating voltage and current 18.5 V dc @ 3.5 A or 19.
35.6 cm (14.0 in), di splay specifications Metric U.S. Dimensions Width 31.2 cm 12.28 in Height 17.6 cm 6.93 in Diagonal 35.7 cm 14.05 in Number of colors Up to 16.8 million Contrast ratio 200:1 (typical) Brightness 200 cd/m 2 (nits) (typical) Backlight LED Character display 80 × 25 Total power consumpt ion 6.
DVD±RW SuperMulti Double-Layer Combo Drive specifications Applicable disc Read CD-DA, CD+(E)G, CD-MIDI, CD-TEXT, CD-R OM, CD-ROM XA, MIXED MODE CD, CD-I, CD-I Bridge (P hoto-CD, Video CD), Multisessi.
BD ROM DVD±R/RW Super Multi Double-Layer Drive specifications Applicable disc Read BD-ROM, BD -ROM-DL, BD-R, BD-R -DL, BD-RE, BD-RE-DL, DVD- ROM, DVD+R, DVD+R-DL , DVD+RW , DVD- R, DVD-R- DL, DVD- RW, DVD- RAM (Ver.
7 Backing up, restoring, and recovering Your computer includes t ools provided by the operating system and HP to help you safeguard your information and re trieve it if ever needed. Creating backups 1. Use HP Recovery Manage r to create re covery media immediately after you set up the working computer.
Creating the r ecovery media 1. Select Start and type recovery in the sear ch field. Select Re covery Ma nager from the list. Allow the action to continue, if prom pted. 2. Click Recovery Media Creation . 3. Follow the on-screen instru ctions to continue.
Tips for a successful backup ● Number backup discs befo re inserting them into the optical drive. ● Store person al files in the Documen ts, Music, Pictures, and Videos libraries, and ba ck up these folders periodically. ● Save customized sett ings in a w indow, toolbar, or menu bar by taking a screen shot of yo ur settings.
To restore, see Restoring specific file s using Window s Backup and Restore on page 86 . Restore and recovery Restoring to a previou s system restore point Sometimes installing a softw are program causes your computer or Windows to behave unpredictably.
● If the recovery media do not work, you can obta in recovery discs for your system from the H P website. ● The Minimized Image Reco very option is recommende d for advanced use rs only. All hardware- related drivers an d software are re- installed, bu t other software applications are not.
To change the boot o rder for a recovery flash drive: 1. Insert the flash drive into a USB port. 2. Restart the computer. 3. Press esc while the computer is re starting, and then press f9 fo r boot options. 4. Select the flash drive from th e boot options window.
8 Power cord set requirements The wide-range input fe ature of the computer perm its it to operate from any line voltage from 100 to 120 V ac, or from 2 20 to 240 V ac. The 3-conductor powe r cord set included wi th t he compu ter meets the requirements for u se in the country or region where the e quipment is purchased .
Requirements for specific countries and regions Country/region Accredited agency Applicable note numb er Argentina IRAM 1 Australia SAA 1 Austria OVE 1 Belgium CEBEC 1 Brazil ABNT 1 Canada CSA 2 Chile.
Country/region Accredited agency Applicable note numb er The United States UL 2 1. The flexible cord must be Type HO5VV-F, 3-conductor , 0. 75 mm² conductor size. Power cord set fittings (appliance coupler and wall plug) must bear the ce rtif ication mark of the agency responsible for evaluation in the countr y or region where it will be used.
9 Recycling When a battery has reached the end of its use ful life, do n ot dispose of the ba ttery in general household waste. Follo w the local laws a nd regulatio ns in your area for battery disposal. HP encourages customers to recycle us ed electronic hard ware, HP original print cartridges, and rechargeable batteries.
Index A AC adapter 11 AC adapter, spare part numbers 20, 21 action keys identifying 7 antenna locations 5 remov al 61 spare part number 18, 22, 61 Antenna Kit, spare part number 18, 22, 61 audio, prod.
grounding 25 packaging 27 transporting 27 workstation 27 H hard drive precautions 25 product description 2 remov al 36 spare part numbers 16, 19, 36 specifications 80 hard drive bay, identifying 12 ha.
power requ irements, pr oduct description 3 processor remov al 72 spare part numbers 16, 21, 72 processors, product description 1 product description audio 2 chipset 1 display panel 1 Ethernet 2 exter.
WLAN module remov al 41 spare part numbers 17, 21, 22, 41 workstation guidelines 27 96 Index.
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