Apple IMAC Service Source - Page 72

the chassis with double-sided tape.

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Procedure 1. Carefully pull the insulators from the chassis (Faraday cage). These are attached to the chassis with double-sided tape. 2. Note: The insulators on the 20-inch iMac (USB 2.0), 922-6217 and 922-6214, are different from the insulators used on the 15-inch and the 17-inch iMac (USB 2.0) computers. 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. Power Supply Insulators iMac (USB 2.0) Take Apart - 63

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iMac (USB 2.0)
Take Apart -
63
Power Supply Insulators
Procedure
1.
Carefully pull the insulators from the chassis (Faraday cage). These are attached to
the chassis with double-sided tape.
2.
Note:
The insulators on the 20-inch iMac (USB 2.0), 922-6217 and 922-6214, are
different from the insulators used on the 15-inch and the 17-inch iMac (USB 2.0)
computers.
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.