Apple IMAC Service Source - Page 20

Replacement Note

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Procedure 1. When opening the bottom housing, rotate the base so the optical drive door is on the right. (This position is less stressful on the internal cables when the bottom is open). 2. Remove the four torx screws. Note: The bottom housing on the 20-inch iMac (USB 2.0) display has a different part number (922-6288) from the bottom housing (9225804) used on the 15-inch and the 17-inch iMac (USB 2.0) computers. Exchange them like-for-like. 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. iMac (USB 2.0) Take Apart - 11

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iMac (USB 2.0)
Take Apart -
11
Procedure
1.
When opening the bottom housing, rotate the base so the optical drive door is on the
right. (This position is less stressful on the internal cables when the bottom is open).
2.
Remove the four torx screws.
Note:
The bottom housing on the 20-inch iMac (USB
2.0) display has a different part number (922-6288) from the bottom housing (922-
5804) used on the 15-inch and the 17-inch iMac (USB 2.0) computers. Exchange
them like-for-like.
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.