Apple imac usb 2 0 User Manual
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![Page 42
iMac (USB 2.0) Take Apart - 33
I/O Port Covers
Procedure
1. Gently pull the I/O port covers off the logic board.
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 ma\
ting 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 mini\
mum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure...](http://img.usermanuals.tech/thumb/462/38804/w64_imac-usb-2-0-41.png "Page 42
iMac (USB 2.0) Take Apart - 33
I/O Port Covers
Procedure
1. Gently pull the I/O port covers off the logic board.
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 ma\
ting 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 mini\
mum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure...")
![Page 44
iMac (USB 2.0) Take Apart - 35
AirPort Antenna Extension Cable
Procedure
1. Release the extension cable from the plastic cable clips to remove the c\
able from the
bottom housing.
Replacement Note: Be careful not to pinch the antenna extension cable when
replacing it.
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 ma\
ting surfaces,
and reapply thermal paste to the mating surfaces on the...](http://img.usermanuals.tech/thumb/462/38804/w64_imac-usb-2-0-43.png "Page 44
iMac (USB 2.0) Take Apart - 35
AirPort Antenna Extension Cable
Procedure
1. Release the extension cable from the plastic cable clips to remove the c\
able from the
bottom housing.
Replacement Note: Be careful not to pinch the antenna extension cable when
replacing it.
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 ma\
ting surfaces,
and reapply thermal paste to the mating surfaces on the...")
32 - iMac (USB 2.0) Take Apart I/O Port Covers I/O Port Covers Tools This procedure requires the following tools: • No tools are required 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. • Remove the RJ-11 board • Remove the logic board.
iMac (USB 2.0) Take Apart - 33 I/O Port Covers Procedure 1. Gently pull the I/O port covers off the logic board. 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 ma\ ting 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 mini\ mum of 17 in.-lbs. Use a torque driver (service tool 076-0899) to ensure that th\ e 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. Failure to follow these steps could cause the computer to overheat and damage internal components. Refer to the topic “Thermal Paste Application” for detailed inform\ ation. Warning: Whenever the logic board is separated from the bottom housing, you must install new thermal pads to three surfaces on the bottom housing. Failure to apply these pads whenever the logic board is separated from the bottom housing could cause these parts to overheat and could damage internal components. Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board from the housing, it is OK to retain the same, new pads as long as they are not handled excessively. Refer to “Thermal Pad Installation” in this chapter for detailed information.
34 - iMac (USB 2.0) Take Apart AirPort Antenna Extension Cable AirPort Antenna Extension Cable Tools This procedure requires the following tools: • No tools are required 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. • Remove the RJ-11 board • Remove the logic board.
iMac (USB 2.0) Take Apart - 35 AirPort Antenna Extension Cable Procedure 1. Release the extension cable from the plastic cable clips to remove the c\ able from the bottom housing. Replacement Note: Be careful not to pinch the antenna extension cable when replacing it. 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 ma\ ting 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 mini\ mum of 17 in.-lbs. Use a torque driver (service tool 076-0899) to ensure that th\ e 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. Failure to follow these steps could cause the computer to overheat and damage internal components. Refer to the topic “Thermal Paste Application” for detailed inform\ ation. Warning: Whenever the logic board is separated from the bottom housing, you must install new thermal pads to three surfaces on the bottom housing. Failure to apply these pads whenever the logic board is separated from the bottom housing could cause these parts to overheat and could damage internal components. Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board from the housing, it is OK to retain the same, new pads as long as they are not handled excessively. Refer to “Thermal Pad Installation” in this chapter for detailed information.
36 - iMac (USB 2.0) Take Apart Thermal Pad Installation Thermal Pad Installation Tools • No tools are required. • Thermal pad kit (076-0925) Part Location Warning: Whenever the logic board is separated from the bottom housing, you must install new thermal pads to two surfaces on the bottom housing. Failure to apply these pads whenever the logic board is separated from the bottom housing could cause these parts to overheat and could damage internal components. Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board from the housing, it is OK to retain the same, new pads as long as they are not handled excessively.
iMac (USB 2.0) Take Apart - 37 Thermal Pad Installation Procedure 1. Remove the old thermal pads from the bottom housing. Note: If you don’t see the two thermal pads on the bottom housing, check the under side of the logic board. The thermal pads may stick to the logic board. Always remove the old thermal pads, and install new pads if you are taking the unit apart to this level. 2. Using the thermal pad kit, remove the clear protective backing from the new thermal pads. 3. Place the new thermal pads on the bottom housing. Press down on the blue protective backing to make sure the thermal pad has even contact with the bottom housing. There should be no air pockets. 4. Remove the blue protective backing from the new thermal pad. Note: Avoid unnecessary contact with either side of the thermal pad as dirt and body oils reduce the thermal pad's conductivity. 5. Slide the logic board back into the bottom housing (make sure the I/O port covers are on the logic board).
38 - iMac (USB 2.0) Take Apart AC Line Filter AC Line Filter Tools This procedure requires the following tools: • Torx-10 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. • Remove the RJ-11 board. • Remove the logic board.
iMac (USB 2.0) Take Apart - 39 AC Line Filter Procedure 1. Peel the black insulator on the bottom housing back to access the AC line filter screws. 2. Remove two screws and lift the AC line filter from the bottom housing. Note: The port plug may fall out of the AC filter port when you remove the AC line filter. Replace the plug into the opening on the bottom housing before reinstalling the AC line filter.
40 - iMac (USB 2.0) Take Apart AC Line Filter 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 ma\ ting 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 mini\ mum of 17 in.-lbs. Use a torque driver (service tool 076-0899) to ensure that th\ e 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. Failure to follow these steps could cause the computer to overheat and damage internal components. Refer to the topic “Thermal Paste Application” for detailed inform\ ation. Warning: Whenever the logic board is separated from the bottom housing, you must install new thermal pads to three surfaces on the bottom housing. Failure to apply these pads whenever the logic board is separated from the bottom housing could cause these parts to overheat and could damage internal components. Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board from the housing, it is OK to retain the same, new pads as long as they are not handled excessively. Refer to “Thermal Pad Installation” in this chapter for detailed information.
iMac (USB 2.0) Take Apart - 41 Drive Carrier Assembly (Optical and Hard Drive) Drive Carrier Assembly (Optical and Hard Drive) Tools This procedure requires the following tools: • Torx-10 screwdriver Part Location Preliminary Steps Before you begin, do the following: • Position the computer in the service stand with the door facing up. • Remove the user access plate. • Remove the bottom housing.