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Motorola Mth500 Basic 6802963c65 Manual

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    MTH500 Portable Radio Basic Service Manual - MAINTENANCE
    Figure 2  Battery Door Removal and Installation
    Figure 3  Battery Removal and Installation 
    						
    							MAINTENANCE:  Removing and Installing the Back Housing
    32
    Removing and Installing the Back Housing
    Recommended tools: T-8 Torx bit, Torx driver, mini flat-tip screwdriver
    To remove the back housing from the unit:
     (See Figure 4)
    1.Remove the antenna, refer to “Removing and Installing the Antenna” on page 29.
    2.Remove the battery door and the battery, refer to “Removing and Installing Battery 
    Door and Battery” on page 30.
    3.Place the unit facing down on the work area.
    4.Using the screwdriver remove the oval label at the top of the unit and the tamper evi-
    dent label in the center to enable access to all six screws fastening the back housing. 
    Clean the adhesive remains of the tamper evident label using alcohol.
    5.Using the Torx driver with the T-8 Torx bit, unscrew the six screws fastening the 
    back housing.
    6.Carefully remove the back housing from the unit.
    To install the back housing:
    1.Position the back housing over the unit.
    2.Verify that the cover is positioned correctly, screw holes are aligned to the threads of 
    the front housing, external antenna connector is inserted into its dedicated hole, and 
    the styling groove of the back housing meets the styling groove of the front housing.
    3.Set the Torx driver to 3.5 in-lb.
    4.Screw the back housing screws in the following order: Upper left and right screws, 
    center left and right screws and lower left and right screws.
    5.Glue a new oval label over the holes of the two upper screws and a new tamper evi-
    dent label on the holes of the two center screws.
    6.Install the battery and the battery door, refer to “Removing and Installing Battery 
    Door and Battery” on page 30. 
    						
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    MTH500 Portable Radio Basic Service Manual - MAINTENANCE
    Figure 4  Back Housing Removal and Installation
    Removing and Installing the Main Board
    Recommended tools: no tools are required
    To remove the main board from the unit:
     (See Figure 5)
    1.Remove the back housing, refer to “Removing and Installing the Back Housing” on 
    page 32.
    2.Gently lift the main board,  I/O connector side at the bottom of the board first, and 
    remove it from the unit.
    Oval Label
    External Antenna Connector
    Back Housing
    Fastening Screws
    (X6) 
    						
    							MAINTENANCE:  Removing and Installing the Main Board
    34
    To install the main board:
    1.Position the main board in location. Verify that the two guide pins are inserted into 
    the holes in the main board.
    2.Gently push the main board down and verify that the Board-to-Board connector is 
    properly connected to the keypad board.
    3.Verify that the I/O rubber seal is properly located in the unit.
    4.Install the back housing, refer to “Removing and Installing the Back Housing” on 
    page 32.
    Figure 5  Main Board Removal and Installation
    Main Board
    PHF Cover
    I/O Connector
    Rubber Seal 
    						
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    MTH500 Portable Radio Basic Service Manual - MAINTENANCE
    Removing and Installing the Keypad and LCD Boards
    Recommended tools: mini flat-tip screwdriver
    To remove the keypad and LCD boards from the unit:
     (See Figure 6)
    1.Remove the back housing, refer to “Removing and Installing the Back Housing” on 
    page 32.
    2.Place the unit facing down on the work area.
    3.Open the Personal Hands-Free Kit (PHF) jack cover (See Figure 5).
    4.Using the screwdriver, remove the chassis assembly including the main board, key-
    pad board and LCD board, out from the unit.
    5.Place the chassis assembly, with the keypad and LCD boards facing down, on the 
    work area.
    6.Remove the main board from the chassis assembly.
    7.Insert the screwdriver into one of the slots in the upper side of the chassis assembly, 
    above the LCD board, and gently push the boards out from the chassis assembly.
    8.According to the board to be replaced, open the required Zero Insertion Force (ZIF) 
    connector, release the flat cable and the board.
    To install the keypad and LCD boards:
    1.Place the keypad and LCD boards on the work area so that the ZIF connectors are fac-
    ing up.
    CAUTION:Care must be taken when installing the keypad and LCD boards on the 
    chassis. Failure to comply may result in tear of the flat cable between 
    the two boards.
    2.Insert the flat cable into the ZIF connectors and close the connectors doors until a 
    click is heard.
    3.Insert the LCD board between the two snags at the sides of the chassis assembly.
    4.Push the LCD board down until it snaps into location.
    5.Verify that the chassis center guide pin is properly located inside the hole in the LCD 
    board and that the snag at the top of the chassis is inserted into the slot of the board. 
    						
    							MAINTENANCE:  Removing and Installing the Keypad and LCD Boards
    36
    6.Install the keypad board on the chassis assembly.
    7.Verify that the keypad board is sited parallel to the chassis assembly.
    8.Verify that the main board is fully installed with the rubber seal.
    9.Turn the chassis assembly up side down. 
    10.Install the main board on the chassis assembly. Verify that the two guide pins are 
    inserted to the holes in the main board.
    11.Verify that the guide pins are properly located and that the Board-to-Board connector 
    is properly connected to the main board.
    12.Install the chassis assembly with the boards into the unit. Verify that the I/O connec-
    tor rubber seal is properly located in the unit.
    13.Install the back housing, refer to “Removing and Installing the Back Housing” on 
    page 32.
    Figure 6  Keypad and LCD Boards Removal and Installation
    Chassis AssemblyLCD Board
    Release SlotLCD Board
    Keypad Board ZIF ConnectorsBoard-to-Board
    Connector Flat Cable 
    						
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    MTH500 Portable Radio Basic Service Manual - MAINTENANCE
    Removing and Installing the LCD Module Assembly
    Recommended tools: no tools are required
    To remove the LCD module assembly:
     (See Figure 7)
    1.Remove the LCD board, refer to “Removing and Installing the Keypad and LCD 
    Boards” on page 35.
    Note:Do not touch the LCD module assembly in the active viewing area; fingerprints on 
    this surface cannot be easily removed.
    2.Using your hand, gently disengage the right two snaps and rotate the LCD module 
    assembly to the left until it disengaged from the LCD board.
    To install the LCD module assembly:
    Note:Do not touch the LCD module assembly in the active viewing area; fingerprints on 
    this surface cannot be easily removed.
    1.Locate the LCD module above the LCD board so that the two guide pins are aligned 
    with the holes in the LCD board.
    2.Gently push the module down, right snaps first and then left snaps.
    3.Verify that the snaps are located correctly inside the board slots.
    4.Remove the protective film from the LCD glass. Verify that no damage exists on the 
    LCD glass.
    5.Install the LCD board, refer to “Removing and Installing the Keypad and LCD 
    Boards” on page 35. 
    						
    							MAINTENANCE:  Removing and Installing the Keypad
    38
    Figure 7  LCD Module Removal and Installation
    Removing and Installing the Keypad
    Recommended tools: no tools are required
    To remove the keypad:
     (See Figure 8)
    1.Remove the chassis assembly, refer to “To remove the keypad and LCD boards from 
    the unit:” on page 35, steps 1 through 3.
    2.Remove the keypad from the unit.
    To install the keypad:
    1.Install the keypad inside the front housing.
    2.Verify that all the keys are properly inserted into their dedicated holes.
    LCD Board
    LCD Module
    LCD Module
    Snaps
    (X4) 
    						
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    MTH500 Portable Radio Basic Service Manual - MAINTENANCE
    3.Install the chassis assembly, refer to “To install the keypad and LCD boards:” on 
    page 35, steps 1 and 2.
    Figure 8  Keypad Removal and Installation
    Removing and Installing the Microphone
    Recommended tools: no tools are required
    To remove the microphone from the unit:
    (See Figure 9)
    1.Remove the chassis assembly, refer to “To remove the keypad and LCD boards from 
    the unit:” on page 35, steps 1 through 3.
    2.Remove the microphone.
    Front Housing
    Chassis Assembly
    Including Main Board
    And
    LCD and Keypad
    Boards
    Keypad 
    						
    							MAINTENANCE:  Removing and Installing the Earphone
    40
    To install the microphone:
    1.Insert a microphone into location.
    2.Install the chassis assembly, refer to “To install the keypad and LCD boards:” on 
    page 35, steps 1 and 2.
    Removing and Installing the Earphone
    Recommended tools: mini flat-tip screwdriver
    To remove the earphone from the unit:
    (See Figure 9)
    1.Remove the chassis assembly, refer to “To remove the keypad and LCD boards from 
    the unit:” on page 35, steps 1 through 3.
    2.Using the screwdriver, remove the earphone from the unit. If the earphone was 
    detached from its bottom plate, remove the plate as well.
    To install the earphone:
    1.Using the screwdriver, remove the protective film from the adhesive layer at the ear-
    phone bottom plate. Remove the Acoustic Safety Rubber.
    2.Insert the earphone into location. Verify that the two snags at the earphone sides are 
    properly located in their dedicated slots.
    3.Gently push the earphone until it is firmly glued inside the front housing. Place the 
    Acoustic Safety Rubber.
    4.Install the chassis assembly, refer to “To install the keypad and LCD boards:” on 
    page 35, steps 1 and 2. 
    						
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