Apple IMAC Service Source - Page 55

You must tighten the four torx screws on the bottom housing to a minimum of 17

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8. Note: The drive carrier on the 20-inch iMac (USB 2.0), 922-6216, is different from the drive carrier used on the 15-inch and the 17-inch iMac (USB 2.0) computers. The 20inch iMac (USB 2.0) drive carrier is shown below. 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. 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. 46 - iMac (USB 2.0) Take Apart

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46 -
iMac (USB 2.0)
Take Apart
8.
Note:
The drive carrier on the 20-inch iMac (USB 2.0), 922-6216, is different from the
drive carrier used on the 15-inch and the 17-inch iMac (USB 2.0) computers. The 20-
inch iMac (USB 2.0) drive carrier is shown below.
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.
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.