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Apple imac 17 inch flat panel User Manual

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     iMac (17-inch Flat Panel)  Take Apart -   
    9  
     Memory, SO-DIMM (user-installable)6. Remove the memory from the slot.  
    						
    							 
    10 - 
     iMac (17-inch Flat Panel) Take Apart
     Bottom Housing 
    Bottom Housing
     
    Tools
     
    This procedure requires the following tools:
    • Torx-15 screwdriver 
    Part Location
    Preliminary Steps
     
    Before you begin, do the following:
    • Position the computer in the service stand.
    • Remove the user access plate. 
    						
    							 
     iMac (17-inch Flat Panel)  Take Apart -   
    11  
      
    Procedure
     
    1. Rotate the base so the optical drive door is on the right. Remove the four torx screws. 
    Replacement Note: 
      
      
    These torx screws must be tightened to at least 17 in.-lbs. If you do 
    not have a torque driver, you will have to make sure these screws are tightened by hand 
    FIRMLY, BUT NOT FORCIBLY. Or, purchase the service tool (076-0899) in order to ensure 
    the thermal pipe is firmly mated with the top base. If the bottom housing is not securely 
    attached to the base in this fashion, the CPU may overheat and become damaged. For 
    more information, refer to “Thermal Paste Application’” in this chapter. Rotate the base so 
    that the optical drive door is on the right.  
    						
    							 
    12 - 
     iMac (17-inch Flat Panel) Take Apart2. Gently open the bottom housing in the direction of the arrow.  
    Note:  
     Cables are still 
    attached to the logic board. 
    						
    							 
     iMac (17-inch Flat Panel)  Take Apart -   
    13  
     3. Disconnect the following: 
    A 
     Power supply connector  
    B 
     Hard drive/optical drive data cable 
    C 
     AC line filter connector 
    D 
     AirPort antenna connector 
    E 
     Plastic cable retainer and video cable 
    F 
     Grounding screw  
    4. Set the bottom housing aside. 
    Warning: 
     Whenever the bottom housing is opened for service, you must do two things:
    1.You must clean the original thermal film from all thermal interface mating surfaces, 
    and reapply thermal paste to the mating surfaces on the thermal pipe.
    2. You must tighten the four torx screws on the bottom housing to a minimum of 17 
    in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is 
    firmly mated with the top base. If you do not have a torque driver, you must make 
    sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.  
    Warning: 
      
    Failure to follow these steps could cause the computer to overheat 
    and damage internal components. 
    Refer to the topic “Thermal Paste Application” for detailed information. 
    						
    							 
    14 - 
     iMac (17-inch Flat Panel) Take Apart
     Thermal Paste Application 
    Thermal Paste Application
     
    Tools
     
    This procedure requires the following tools:
    • Plastic stylus or plastic spatula to remove the old thermal paste
    • Plastic stylus or plastic spatula to spread the thermal paste
    • Thermal paste (922-4757) 
    Part Location 
    						
    							 
     iMac (17-inch Flat Panel)  Take Apart -  
    15  
     Thermal Paste Application 
    Procedure
     
    1. Thoroughly clean the original thermal film from the mating surfaces (circled below) of 
    the bottom housing and thermal pipe. Use a plastic stylus to scrape the surfaces 
    clean.  
    Note: 
      Do not use an abrasive material or liquid cleaner.
    2. Squeeze a thin film of thermal paste onto the mating surfaces of the thermal pipe.  
    						
    							 
    16 - 
     iMac (17-inch Flat Panel) Take Apart
     Thermal Paste Application 3. Replace the bottom housing.
      
    Warning:  
    The bottom housing has four torx screws that must be tightened to at least 
    17 in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe 
    is firmly mated with the top base. If you do not have a torque driver, you must make 
    sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.  
    Warning: 
      
    Failure to apply the thermal paste as described in this procedure, and 
    failure to tighten the torx screws as directed, could cause the computer to 
    overheat and damage internal components. 
    Refer to the topic “Thermal Paste Application” for detailed information. 
    						
    							 
     iMac (17-inch Flat Panel)  Take Apart -  
    17  
     RJ-11 Modem Filter Board 
    RJ-11 Modem Filter Board
     
    Tools
     
    This procedure requires the following tools:
    • Torx-6 screwdriver 
    Part Location
    Preliminary Steps
     
    Before you begin, do the following:
    • Position the computer in the service stand.
    • Remove the user access plate.
    • Remove the bottom housing. 
    						
    							 
    18 - 
     iMac (17-inch Flat Panel) Take Apart
     RJ-11 Modem Filter Board 
    Procedure
     
    1. Remove two screws and disconnect the cable from the modem.
    2. Remove the RJ-11 board from the I/O port. 
    Warning: 
     Whenever the bottom housing is opened for service, you must do two things:
    1.You must clean the original thermal film from all thermal interface mating surfaces, 
    and reapply thermal paste to the mating surfaces on the thermal pipe.
    2. You must tighten the four torx screws on the bottom housing to a minimum of 17 
    in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is 
    firmly mated with the top base. If you do not have a torque driver, you must make 
    sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.  
    Warning: 
      
    Failure to follow these steps could cause the computer to overheat 
    and damage internal components. 
    Refer to the topic “Thermal Paste Application” for detailed information. 
    						
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