Apple imac usb 2 0 User Manual

							
 
12 -  
 iMac (USB 2.0)  Take Apart 3. Gently open the bottom housing in the direction of the arrow. Disconnect the cables. 
						

							
 
 iMac (USB 2.0)  Take Apart -   
13
 
  4. Disconnect the following:
 
A 
 Grounding screw  
B 
 Bluetooth connector (if Bluetooth board is present, this will be conne\
cted)  
C  
 AirPort connector  
D  
 AC line filter connector  
E  
 TMDS video connector  
F  
 Inverter, speaker, fan connector  
G  
 Optical cable and connector  
H  
 Hard drive cable and connector   
I  
 Power Supply connector 
						

							
14 - iMac (USB 2.0)  Take Apart 5. Set the bottom housing aside. 
Note: Before returning the bottom housing to Apple, 
remove the logic board, modem, RJ-11 board, memory, Bluetooth board (if present), 
antenna, AirPort Extreme card (if present), and the I/O port covers.
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. 
						

							
 iMac (USB 2.0)  Take Apart - 15
 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 
						

							
16 - iMac (USB 2.0)  Take Apart
 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 ball of thermal paste onto the mating surfaces of the thermal pipe.  
						

							
 iMac (USB 2.0)  Take Apart - 17
 Thermal Paste Application 3. Replace the bottom housing.
 Warning:  The bottom housing has four torx screws that must be tightened to at lea\
st 
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, y\
ou must make 
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY. 
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 inform\
ation. 
						

							
18 - iMac (USB 2.0)  Take Apart
 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. 
						

							
 iMac (USB 2.0)  Take Apart - 19
 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 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. 
						

							
20 - iMac (USB 2.0)  Take Apart
 Modem
Modem
Tools
This procedure requires the following tools:
• Torx-8 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. 
						

							
 iMac (USB 2.0)  Take Apart - 21
 Modem
Procedure
1. Remove two screws and disconnect the cable.
2. Lift the modem board from the connector on 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.