Acer ASPIRE M3910(G) Service Manual Download Page 34

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Chapter 3

This chapter contains step-by-step procedures on how to disassemble the desktop computer for maintenance
and troubleshooting.

Disassembly Requirements

To disassemble the computer, you need the following tools:

•

Wrist grounding strap and conductive mat for preventing electrostatic discharge

•

Flat-blade screwdriver

•

Philips screwdriver

•

Hex screwdriver

•

Plastic flat-blade screwdriver

•

Plastic tweezers

NOTE:

The screws for the different components vary in size. During the disassembly process, group the

screws with the corresponding components to avoid mismatch when putting back the components.

Chapter 3

System Disassembly

Summary of Contents for ASPIRE M3910(G)

Page 1: ...Acer Aspire M3910 G Service Guide PRINTED IN TAIWAN ...

Page 2: ...ii Revision History Please refer to the table below for the updates made on this service guide Date Chapter Updates ...

Page 3: ...ublication may be reproduced transmitted transcribed stored in a retrieval system or translated into any language or computer language in any form or by any means electronic mechanical magnetic optical chemical manual or otherwise without the prior written permission of Acer Incorporated ...

Page 4: ... programs prove defective following their purchase the buyer and not Acer Incorporated its distributor or its dealer assumes the entire cost of all necessary servicing repair and any incidental or consequential damages resulting from any defect in the software Acer is a registered trademark of Acer Corporation Intel is a registered trademark of Intel Corporation Pentium Dual Core Celeron Dual Core...

Page 5: ...ditional information related to the current topic WARNING Alerts you to any physical risk or system damage that might result from doing or not doing specific actions CAUTION Gives precautionary measures to avoid possible hardware or software problems IMPORTANT Reminds you to do specific actions relevant to the accomplishment of procedures ...

Page 6: ...h cases please contact your regional offices or the responsible personnel channel to provide you with further technical details FRU Information Please note WHEN ORDERING FRU PARTS that you should check the most up to date information available on your regional web or channel If for whatever reason a part number change is made it will not be noted in the printed Service Guide For ACER AUTHORIZED SE...

Page 7: ...cessor 30 Removing the VGA Card 31 Removing the TV Card 32 Removing the Mode Card 32 Removing the Hard Disk Drive 33 Removing the Front Bezel 35 Removing the Optical Drive 36 Removing the Rear USB Board 37 Removing the Cables 38 Removing the System FAN 39 Removing the Power Supply 40 Removing the Memory Modules 41 Removing the removable HDD bay 42 Removing the Mainboard 43 System Troubleshooting 4...

Page 8: ...viii FRU Field Replaceable Unit List 60 Aspire M3910 G Exploded Diagram AM350 ASSY 61 Aspire M3910 G Exploded Diagram AM351 ASSY 62 Aspire M3910 G FRU List 63 ...

Page 9: ...pus X window mode FreeDos Processor Socket Type Intel Socket T LGA 1156 pin Socket Quantity 1 Processor Type Intel Lynnfield Clarkdale FMB 95W 65W FMB Chipset PCH Intel H57 Design Criteria Must meet Intel Lynnfield and Clarkdale platform design guides Super I O ITE8720 Should support Intel ASFC Should support Intel PECI PCB uATX 244 244mm 4 Layers Memory subsystem Socket Type DDR III connector Soc...

Page 10: ...in the single PSIe X16 slot On Board Graphic solution Intel HD Graphics Clarkdale series CPU DVMT 5 0 technology support Enhanced 3D and Clear Video technology support 1 D sub VGA port on rear 1 HDMI port on rear Dual View function support Serial ATA controller Slot Type SATA connector Six SATA ports 4 for HDD 2 for ODD Storage Type support 1 HDD Support RAID 0 1 5 10 2 CD ROM CD RW DVD ROM DVD RW...

Page 11: ...D Sub VGA port 1 HDMI port 1 RJ45 LAN port 6 USB ports 3 ports Audio jack One HD headphone output in front bezel One MIC IN in front bezel 4 USB H5X2 Header support 8 ports 1 Front Audio Pannel H5X2 header 1 Front Panel IO H7X2 Header for Acer pin define 1 H1X4 CPU with SAMRT FAN controller 1 H1X3 System with SAMRT FAN controller 1 H1X4 SPDIFOUT Header for Acer pin define 1 H3X1 Clear CMOS Header ...

Page 12: ...4 Chapter 1 Block Diagram ...

Page 13: ... interior and exterior components Front Panel No Component 1 USB 2 0 ports 2 Acer logo 3 Optical drive button 4 Optical drive button Removable HDD bay for AM351 bezel 5 16 in 1 Card Reader 6 Power button 7 Headphone Speaker out line out jack 8 Microphone in jack 4 7 1 3 5 8 6 2 ...

Page 14: ... keyboard port 3 HDMI port 4 VGA port 5 USB 2 0 ports 6 Mic in 7 Line out 8 Expansion slot graphics card and TV tuner card and Mode card 9 Line in 10 USB 2 0 ports 11 LAN connector 12 System FAN 13 PS2 mouse port 14 Fan aperture 4 7 1 11 12 3 14 13 5 10 8 6 9 2 ...

Page 15: ...rnel with Acer skin BIOS version P01 A0 BIOS ROM type SPI ROM BIOS ROM size 2Mb Support protocol SMBIOS DMI 2 4 DMI2 0 Device Boot Support Support BBS spec 1st priority HDD 2nd priority CD ROM 3th priority Removable Device 4th priority LAN Support to LS 120 drive YES Support to BIOS boot block feature YES Hotkey Function Description Del Enter BIOS Setup Utility Press while the system is booting to...

Page 16: ...bination as long as they match the above specifications Item Specification Audio controller PCH Intel H57 Audio controller type Realtek ALC662VC 0 Audio channel codec 5 1 Audio function control No Mono or stereo Stereo Compatibility The ALC662VC series support host audio controller from the Intel ICH series chipset and also from any other HDA compatible audio controller With EAX Direct Sound 3D I3...

Page 17: ... legacy keyboard for legacy mode USB Connectors Quantity 6 back real ports 4 top bezel ports 2 H5X2 Hedaer Item Specification Temperature Operating 5 C 35 C Non operating 20 60 C Storage package Humidity Operating 15 to 80 RH Non operating 10 to 90 RH Vibration Operating unpacked 5 500 Hz 2 20g RMS random 10 minutes per axis in all 3 axes 5 500 Hz 1 09g RMS random 1 hour per axis in all 3 axes Dev...

Page 18: ...external switch Button modem ring in keyboard an mouse for APM mode Resume recovery time 7 10sec Suspend Mode Independent power management timer 2 120minutes time step 10minute or pushing extern switch button CPU goes into SMM CPU asserts STPCLK and goes into the Stop Grant State LED on panel turns amber colour Hard disk drive goes into SLEEP mode for ATA standard interface Disable H sync and V sy...

Page 19: ...rompted Run Setup message to make changes to the CMOS setup NOTE If you repeatedly receive Run Setup messages the battery may be bad In this case the system cannot retain configuration values in CMOS Ask a qualified technician for assistance CMOS setup loads the configuration values in a battery backed nonvolatile memory called CMOS RAM This memory area is not part of the system RAM which allows c...

Page 20: ...page of a multiple page menu Home Move the cursor to the first page of a multiple page menu End Move the cursor to the last page of a multiple page menu and keys Select a value for the currently selected field only if it is user configurable Press these keys repeatedly to display each possible entry or the Enter key to choose from a pop up menu NOTE Grayed out fields are not user configurable Ente...

Page 21: ...p page includes all advanced chipset features Integrated Peripherals This setup page includes all onboard peripherals Power Management Setup This setup page includes all the items of Green function features PC Health Status This setup page is the System auto detect Temperature voltage and fan speed Frequency Voltage Control This setup page is the System Frequency setup BIOS Security Features Chang...

Page 22: ...pe of CPU installed on the system Processor Speed Speed of the CPU installed on the system System Memory Total size of system memory installed on the system Product Name Product name of the system System Serial Number Serial number of the system System BIOS Version Version number of the BIOS setup utility BIOS Release Date Date when the BIOS setup utility was released Asset Tag Number Asset tag nu...

Page 23: ...ption System Date Set the date following the weekday month day year format System Time Set the system time following the hour minute second format Halt On Determines whether the system will stop for an error during the POST All But Keyboard No Errors All Errors ...

Page 24: ...e LAN Hard Disk Drive Priority Press Enter to access the Hard Disk Drive Priority submenu and specify the boot device priority sequence from available hard drives Optical Disk Drives Priority Press Enter to access the Optical Disk Drive Priority submenu and specify the boot device priority sequence from available CD DVD drives Removable Device Priority Press Enter to access the Removable Device Pr...

Page 25: ...ocessor forces the Execute Disable XD Bit feature flag to always return to 0 Enabled Disabled Intel VT Enables or disables the Virtualization Technology VT availability If enabled a virtual machine manager VMM can utilize the additional hardware virtualization capabilities provided by this technology Note A full reset is required to change the setting Enabled Disabled Memory Hole Remapping Enables...

Page 26: ...oller Enabled Disabled Legacy USB Support Enables or disables support for legacy USB devices Enabled Disabled USB Storage Emulation Enables or disables support for legacy USB devices Enabled Disabled Onboard Audio Controller Enables or disables the onboard audio controller Enabled Disabled Onboard LAN Controller Enables or disables the onboard LAN controller Enabled Disabled Onboard LAN Option ROM...

Page 27: ...ugh an event on PCI Express device Enabled Disabled Power On by PCI Devices Enables or disables to wake up the system from a power saving mode through an event on PCI device Enabled Disabled Wake Up by PS 2 KB Mouse Enables or disables to wake up the system from a power saving mode using a PS2 keyboard or mouse Enabled Disabled Wake Up by USB KB Mouse If enabled press any key or click the mouse wi...

Page 28: ...20 Chapter 2 PC Health Status Parameter Description Option Smart FAN Enables or disables the smart system fan control function Enabled Disabled ...

Page 29: ... the clock to all DIMM PCI Enabled Disabled Spread Spectrum Enables or disables the reduction of the mainboard s EMI Note Remember to disable the Spread Spectrum feature if you are overclocking A slight jitter can introduce a temporary boost in clock speed causing the overclocked processor to lock up Enabled Disabled ...

Page 30: ... Type the original password then press Enter 3 Type a new password then press Enter 4 Retype the password to verify the first entry then press Enter again 5 Press F10 6 Select Yes to save the new password and close the Setup Utility Removing a supervisor password 1 Use the up down arrow keys to select Change Supervisor Password menu then press Enter 2 Enter the current password then press Enter 3 ...

Page 31: ...ad the default settings for all BIOS setup parameters Setup defaults are quite demanding in terms of resources consumption If you are using low speed memory chips or other kinds of low performance components and you choose to load these settings the system might not function properly ...

Page 32: ...24 Chapter 2 Save Exit Setup The Save Exit Setup menu allows you to save changes made and close the Setup Utility ...

Page 33: ...Chapter 2 25 Exit Without Saving The Exit Without Saving menu allows you to discard changes made and close the Setup Utility ...

Page 34: ...g tools Wrist grounding strap and conductive mat for preventing electrostatic discharge Flat blade screwdriver Philips screwdriver Hex screwdriver Plastic flat blade screwdriver Plastic tweezers NOTE The screws for the different components vary in size During the disassembly process group the screws with the corresponding components to avoid mismatch when putting back the components Chapter 3 Syst...

Page 35: ...cedure perform the steps listed below 1 Turn off the system and all the peripherals connected to it 2 Unplug the power cord from the power outlets 3 Unplug the power cord from the system 4 Unplug all peripheral cables from the system 5 Place the system unit on a flat stable surface ...

Page 36: ...screws located on the rear edge of the side panel 2 Slide the side panel toward the back of the chassis until the tabs on the cover disengage with the slots on the chassis 3 Lift the side panel away from the server and put it aside for reinstallation later ...

Page 37: ... when the system is on NEVER touch the heat sink with any metal or with your hands 1 disconnect the fan cable from the mainboard 2 Use a long nosed screwdriver to loosen the four screws on the heat sink in the order as shown below 3 Lift the heat sink fan assembly away from the mainboard ...

Page 38: ...ecomes very hot when the system is on Allow it to cool off first before handling 1 Release the load lever 2 Lift the load lever and load plate to the fully open upright position 1 and 2 3 Pull out the processor from the socket IMPORTANT If you are going to install a new processor note the arrow on the corner to make sure the processor is properly oriented over the socket ...

Page 39: ... the VGA Card 1 Release the Slot cover lock 2 Remove the screw from chassis 3 Disconnect the power cables from the VGA card 4 One finger Press the clip and the same time Gently pull the card to remove it from the mainboard ...

Page 40: ...Chapter 3 32 Removing the TV Card 1 Gently pull the TV card to remove it from the mainboard Removing the Mode Card 1 Gently pull the Mode card to remove it from the mainboard ...

Page 41: ...Disk Drive 1 Disconnect the data and power cables from the rear of the optical drive and the mainboard 2 Remove the HDD bracket a Remove the screw that secures the HDD bracket to the ODD bracket b Lift the bracket up and turn it over ...

Page 42: ...Chapter 3 34 3 Remove the HDD module a Remove the eight screws secure the HDD module to the HDD bracket b Slide the HDD out of the bracket ...

Page 43: ... Removing the Front Bezel 1 Remove the side panel Refer to the previous section for instructions 2 Disconnect the LED cable 3 Release the front bezel from the chassis interior 4 Pull the bezel away from the chassis ...

Page 44: ...3 36 Removing the Optical Drive 1 Disconnect the data and power cables from the rear of the optical drive 2 Remove Four screw from the optical drive 3 Pull the drive out of the drive D ata cabl e Pow er cabl e ...

Page 45: ...37 Chapter 3 Removing Real USB Board 1 Remove USB cable 2 Release the screw of real usb 3 Remove the real usb board ...

Page 46: ...es 1 Remove power switch and LED cables from slot of M B 2 Remove HDD Data and ODD Data cables from slot of M B 3 Remove USB1 2 3 cable from M B 4 Remove FIO cable and Audio cable from M B O DD Cabl e Pow e Led Cabl e HDD Cabl e ...

Page 47: ...39 Chapter 3 Remove System FAN 1 Remove System FAN cable from M B 2 Release four screws according to the following picture 3 Take off the system fan from chassis ...

Page 48: ...emoving the Power Supply 1 Disconnect the 24 pin and 4 pin power supply cables from the mainboard 2 Remove the four screw that secures the power supply to the chassis 3 Lift the power supply module out of the chassis ...

Page 49: ...NT Before removing any DIMM from the memory board make sure to create a backup file of all important data 1 Press the holding clips on both sides of the DIMM slot outward to release the DIMM 2 Gently pull the DIMM upward to pull it away from the M B ...

Page 50: ...Chapter 3 42 Removing the removable HDD bay 1 Remove the HDD rail 2 Remove the screws that secure the HDD bay 3 Remove the HDD bay ...

Page 51: ...ht screws that secure the mainboard to the chassis 2 Lift the board from the chassis Note Circuit boards 10 cm has been highlighted with the yellow rectangle as above image shows Please detach the Circuit boards and follow local regulations for disposal ...

Page 52: ...ching in IO Shield then you can remove it 4 Remove the RTC battery Note RTC battery has been highlighted with the yellow circle as above image shows Please detach the RTC battery and follow local regulations for disposal ...

Page 53: ...oducts Non Acerproducts prototype cards or modified options can give false errors and invalid systemresponses 1 Obtain the failing symptoms in as much detail as possible 2 Verify the symptoms by attempting to recreate the failure by running the diagnostic tests or repeating thesame operation 3 Refer to Power System check and Beep Codes to determine which corrective action to perform System Trouble...

Page 54: ...th System Internal Inspection System Internal Inspection 1 Turn off the system and all the peripherals connected to it 2 Unplug the power cord from the power outlets 3 Unplug the power cord from the system 4 Unplug all peripheral cables from the system 5 Place the system unit on a flat stable surface 6 Remove the system covers For instructions on removing system covers refer to System Disassembly ...

Page 55: ...rd has been activated Not all computers using AMIBIOS enable this feature In most cases a checkpoint card is the best tool for viewing AMIBIOS checkpoints Beep Symptom Cause and Description One short beep System is ready System is OK Continuous one long beep Memory not installed or memory error One long beep and two short beeps then repeat VGA not installed or VGA error Graphics card error not ins...

Page 56: ... critical initialization Early chipset initialization is done D1 Early super I O initialization is done including RTC and keyboard controller Serial port is enabled at this point if needed for debugging NMI is disabled Perform keyboard controller BAT test Save power on CPUID value in scratch CMOS Go to flat mode with 4GB limit and GA20 enabled D2 Verify the boot block checksum System will hang her...

Page 57: ...Checkpoints section of document for more information DC System is waking from ACPI S3 state E1 E8 EC EE OEM memory detection configuration error This range is reserved for chipset vendors system manufacturers The error associated with this value may be different from one platform to the next Checkpoint Description ...

Page 58: ...floppy EA Enable ATAPI hardware Attempt to read from ARMD and ATAPI CDROM EB Disable ATAPI hardware Jump back to checkpoint E9 EF Read error occurred on media Jump back to checkpoint EB F0 Search for pre defined recovery file name in root directory F1 Recovery file not found F2 Start reading FAT table and analyze FAT to find the clusters occupied by the recovery file F3 Start reading the recovery ...

Page 59: ...directory of recovery media 4 2 Rename the BIOS ROM file to be AMIBOOT ROM 4 3 Insert the recovery device to system and then power on the system 4 4 Don t do anything during the recovery function to be progress but just only observe the recovery media has been loading or not 4 5 If the recovery function run normally the recovery function will execute 1 3 minutes The system will auto reboot after t...

Page 60: ...Chapter 5 52 M B Placement Jumper and Connector Information Chapter 5 ...

Page 61: ...ard 24 pin ATX power connector 6 SPI_DEBUG SPI debug header factory use only 7 SATA1 6 Serial ATA connectors 8 F_PANEL Front panel switch LED header 9 F_USB3 4 Front panel USB headers 10 CLR_CMOS Clear CMOS jumper 11 ME_DISABLE ME disable jumper 12 F_USB2 Front panel USB header 13 F_USB1 Front panel USB header Card Reader 14 SPDIF_OUT1 SPDIF out header 15 F_AUDIO1 Front panel audio header 16 PCI1 ...

Page 62: ...numbered When setting the jumpers ensure that the jumper caps are Placed on the correct pins Checking Jumper Settings The following illustration shows the location of the motherboard jumpers Pin 1 is labeled Jumper Type Description Setting default CLR_CMOSCLR_CMOS 3 pin CLEAR CMOS 1 2 NORMAL 2 3 CLEAR Before clearing the CMOS make sure to turn the system off CLR_CMOS ME_DISABLE MEDISABLE 1 2 NORMA...

Page 63: ... s simpler disk drive cabling and easier PC assembly It eliminates limitations of the current Parallel ATA interface But maintains register compatibility and software compatibility with Parallel ATA F_USB1 4 Front Panel USB headers The motherboard has four USB ports installed on the rear edge I O port array Additionally some computer cases have USB ports at the front of the case If you Pin Signal ...

Page 64: ...DIF_OUT Sony Philips Digital Interface output to digital multimedia device through optical fiber or coaxial connector Pin Signal Name Function 1 USBPWR me Front Panel USB Power 2 USBPWR Front Panel USB Power 3 USB_FP_P0 USB Port 0 Negative Signal 4 USB_FP_P1 USB Port 1 Negative Signal 5 USB_FP_P0 USB Port 0 Positive Signal 6 USB_FP_P1 USB Port 1 Positive Signal 7 GND Ground 8 GND Ground 9 Key No p...

Page 65: ...d in BIOS INT_SPK1 Internal speaker OBR Button recovery jumper PRINTER Oboard parallel port header Pin Signal Name Pin Signal Name 1 5V 2 KEY 3 SPDIF 4 GND Pin Signal Name 1 Caseopen 2 GND Pin Signal Name Pin Signal Name 1 Output_L 2 GND 3 Output_R 4 Ground 5 GND 6 GND 7 N A 8 VCC Pin Signal Name 1 OBR 2 GND Pin Signal Name Pin Signal Name 1 STROBE 2 PD0 3 PD1 4 PD2 5 PD3 6 PD4 7 PD4 8 PD6 ...

Page 66: ... SLCTIN 18 Ground 19 Ground 20 Ground 21 Ground 22 Ground 23 Ground 24 Ground 25 Ground 26 NC Pin Signal Name Pin Signal Name 1 CK_P_33M_T PM 2 GND 3 FWH4 4 NC 5 PCIRST_L1 6 SMBDATA 7 PCIRST_L1 8 FWH2 9 VCC3 10 FWH1 11 FWH0 12 GND 13 NC 14 NC 15 3VSBY 16 SIRQ 17 GND 18 GND 19 LPCPD_L 20 SMBCLK Pin Signal Name Pin Signal Name 1 CS 2 WP Signal Name 3 DI 4 HOLD Pin Signal Name Pin Signal Name ...

Page 67: ...59 Chapter 5 GPIO0 1 Button recovery jumper 5 VCC 6 CLK 7 GND 8 DO Pin Signal Name 1 GP36 GP16 2 GND Pin Signal Name Pin Signal Name ...

Page 68: ... on the printed Service Guide For Acer authorized service providers your Acer office may have a different part number code from those given in the FRU list of this printed Service Guide You MUST use the local FRU list provided by your regional Acer office to order FRU parts for service To scrap or to return the defective parts follow the local government ordinance or regulations on how to dispose ...

Page 69: ...910 G Exploded Diagram AM350 ASSY NOTE This section will be updated when more information becomes available ITEM NAME Q TY ITEM NAME Q TY 1 CHASSIS ASM 1 4 HDD BRACKET 1 2 TOP COVER 1 5 SIDE COVER 1 3 FRONT BEZEL 1 6 POWER 1 ...

Page 70: ...ed Diagram AM351 ASSY NOTE This section will be updated when more information becomes available ITEM NAME Q TY ITEM NAME Q TY 1 CHASSIS ASM 1 5 HDD BRACKET 1 2 TOP COVER 1 6 SIDE COVER 1 3 REMOVABLE HDD BRACKET 1 7 POWER 1 4 FRONT BEZEL ...

Page 71: ...0 USB 4 port bezel for HM090G chassis PZ 11900 174 Hon Hai Aspire Bezel AM351 w i 3 5 x1 carrier USB 4 port bezel for HM090J chassis PZ 11900 181 Card Reader IOI 16 in 1 CR M1 M3 w 3 5 USB2 0 UsBSET UT330 LK w micro SD M2 CR 10400 071 NS 16 in 1 CR M1 M3 w 3 5 USB2 0 Realtek RT5181 w micro SD M2 CR 10400 100 CPU Cooler Cooler Intel LGA 1156 FXC PKP775G01U12 w i duct HI 10800 049 CM iCooler LGA1156...

Page 72: ...PU Intel Core i3 530 LGA 2 93G 4M 1333 1156 73W C 2 Dual Core KC 53001 CI3 Pentium Dual Core G6950 2 8G 2M 1066FSB KC 69501 DEG Memory M378B2873FHS CH9 LF 128 8 46nm KN 1GB0B 036 M378B5673FH0 CH9 LF 128 8 46nm KN 2GB0B 024 GU502203EP0201 LF 128 8 0 065um KN 1GB0H 015 GU512303EP0202 LF 128 8 0 065um KN 2GB0H 009 75 073C1 G02 LF 128 8 0 065um KN 1GB01 031 75 A73C1 G02 LF 128 8 0 065um KN 2GB01 025 M...

Page 73: ...NV GT320 1GB sDDR3 DVI HDMI VGA ATX SAMSUNG VG PCPT3 201 NV GT320 1GB sDDR3 DVI HDMI VGA ATX HYNIX VG PCPT3 202 NV 315 512MB sDDR3 DVI HDMI VGA ATX SAMSUNG VG PCPT3 151 NV 315 512MB sDDR3 DVI HDMI VGA ATX HYNIX VG PCPT3 152 GEFORCE 310 512MB DDR2 SAMSUNG 64BITS VGA DVI HDMI ATX BRACKET ROHS VG PCPT3 101 GEFORCE 310 512MB DDR2 HYNIX 64BITS VGA DVI HDMI ATX BRACKET ROHS VG PCPT3 102 HD5850 1GB 256BI...

Page 74: ...200 068 Chicony wireless mouse RF2 4 MG 0766 new silver color AC MT 113 MS 11200 069 External Speaker Neosonica Speaker Acer logo LF 0810 9M 20A200 000 SP 10600 011 Neosonica speaker USB new silver color AC MT 113 SP 10600 035 KB Keyboard LITE ON SK 9625S USB 104KS Silver US new silver color AC MT 113 KB USB0B 203 Keyboard LITE ON SK 9625S USB 104KS Silver US new silver color AC MT 113 KB USB0B 24...

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