Apple imac usb 2 0 User Manual

							
22 - iMac (USB 2.0)  Take Apart
 Memory (factory-installed)
Memory (factory-installed)
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. 
						

							
 iMac (USB 2.0)  Take Apart - 23
 Memory (factory-installed)
Procedure
1. Push down on the ejector tabs to release the memory module.
2. Pull the memory up and out of the slot.  Important: Make sure that the memory 
installed on the logic board is compatible with the system. The computer accepts 
double-data rate (DDR) SDRAM DIMMs. DIMMs used in this slot must fit the following 
specification: PC2700 SDRAM DDR333 DIMMs for 167 MHz systems. 
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. 
						

							
24 - iMac (USB 2.0)  Take Apart
 Battery
Battery
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. 
						

							
 iMac (USB 2.0)  Take Apart - 25
 Battery
Procedure
1. Using a flatblade screwdriver, gently pry the battery from the battery holder.
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. 
						

							
26 - iMac (USB 2.0)  Take Apart
 Logic Board
Logic Board
Tools
This procedure requires the following tools:
• Phillips #2 screwdriver (for the plastic screw)
• Torx-15 screwdriver 
Part Location
Note: The battery, RJ-11 board, AirPort Extreme card, modem, I/O port covers, memory 
(on the top and the bottom of the logic board), Bluetooth board and th\
e Bluetooth 
extension cable need to be removed from the logic board before returning the board to 
Apple for service.
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. 
						

							
 iMac (USB 2.0)  Take Apart - 27
 Logic Board
Procedure
1. Remove the three torx screws (metal) and one plastic screw. 
						

							
28 - iMac (USB 2.0)  Take Apart
 Logic Board
2. Grab the logic board by the battery retainer and the hard drive connector. Lift the 
board slightly and pull back to release the board from the bottom housing and I/O 
ports.  Note:  The I/O port covers may come out with the logic board when it’s 
removed. 
3. Remove the I/O port covers from the logic board.
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.
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 - 29
 Bluetooth Board and Cable  
Bluetooth Board and Cable
Tools
This procedure requires the following tools:
• Phillips #2 jeweler’s 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. 
						

							
30 - iMac (USB 2.0)  Take Apart
 Bluetooth Board and Cable
Procedure
1. Ground yourself. Remove the AirPort Extreme card and SO-DIMM memory (if 
present).
2. Remove the logic board protective cover to access the Bluetooth board 
						

							
 iMac (USB 2.0)  Take Apart - 31
 Bluetooth Board and Cable 3. Remove the two screws (circled below) on the Bluetooth board. 
4. Peel the Kapton tape off the Bluetooth extension cable. Disconnect the extension 
cable from the Bluetooth board.  Note:  The Bluetooth wireless extension cable is a 
separate service part from the Bluetooth board. 
5. Lift the Bluetooth board from the connector on the logic board.
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.
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.