Apple IMAC Service Source - Page 146

General Information, Overview:, Important Things to Remember:, iMac USB 2.0 Troubleshooting - transfer

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General Information Overview: How do you identify the different models? 1. Identify the different models by their serial number. Search for the serial number in GSX (Global Service Exchange) under the "Parts Lookup" or search in the Service Parts Database. 2. Identify the processor speed. If the system is up and running, select "About this Mac" under the Apple icon in the Finder. Or, select the "More Info" button on the "About this Mac" window. Apple System Profiler opens and displays the machine speed under "Hardware Overview." The 15-inch iMac has a 1GHz PowerPC G4 processor and the 17-inch and 20-inch iMac have a 1.25GHz PowerPC G4 processor. 3. Identify the various neck assemblies by referring to the topic "Neck Extension Identification" in Take Apart, or by referring to the Knowledge Base article 86525, "iMac: Flat Panel Neck Assembly Differences". 4. These computer models uses double-data rate (DDR) memory; PC2700 DDR333. Memory from previous iMac models is not compatible with this computer. Do not use older SDRAM DIMMs or SODIMMs even if they fit into the slot. Make sure to use PC2700 DDR333 low profile SO-DIMMs in the userinstallable slot. The iMac memory pinouts are 184-pin internal, and 200-pin on the user-installable slot. Important Things to Remember: Service items that still apply to all flat-panel iMac computers: 1. Diagnostic test points are on to the logic board. They are accessed through the user access door. Use the test points to check the following: • Battery • 5V • 12VSLP • 12V For more information, refer to the "Logic Board Battery" and "No Power" topics later in this chapter. 2. Important: The CPU uses a thermal pipe to transfer heat away. This pipe makes a thermal connection to the top metal chassis (Faraday cage) at two locations. These connecting points must be cleaned and have new thermal paste applied each time the bottom housing is removed. If the mating surfaces are not cleaned and thermal paste is not used, the CPU may overheat and become damaged. There is no exception to this. Note: Most service procedures require that the bottom housing is removed. Refer to "Thermal Paste Application" mentioned later in this chapter or in the Take Apart chapter. General Information iMac (USB 2.0) Troubleshooting - 1

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iMac (USB 2.0) Troubleshooting -
1
General Information
General Information
Overview:
How do you identify the different models?
1.
Identify the different models by their serial number. Search for the serial number in GSX (Global Service
Exchange) under the “Parts Lookup” or search in the Service Parts Database.
2.
Identify the processor speed. If the system is up and running, select “About this Mac” under the Apple
icon in the Finder. Or, select the “More Info” button on the “About this Mac” window. Apple System
Profiler opens and displays the machine speed under “Hardware Overview.” The 15-inch iMac has a
1GHz PowerPC G4 processor and the 17-inch and 20-inch iMac have a 1.25GHz PowerPC G4
processor.
3.
Identify the various neck assemblies by referring to the topic “Neck Extension Identification” in Take
Apart, or by referring to the Knowledge Base article 86525, “iMac: Flat Panel Neck Assembly
Differences”.
4.
These computer models uses double-data rate (DDR) memory; PC2700 DDR333. Memory from
previous iMac models is not compatible with this computer. Do not use older SDRAM DIMMs or SO-
DIMMs even if they fit into the slot. Make sure to use PC2700 DDR333 low profile SO-DIMMs in the user-
installable slot. The iMac memory pinouts are 184-pin internal, and 200-pin on the user-installable slot.
Important Things to Remember:
Service items that still apply to all flat-panel iMac computers:
1.
Diagnostic test points are on to the logic board. They are accessed through the user access door. Use
the test points to check the following:
• Battery
• 5V
• 12VSLP
• 12V
For more information, refer to the “Logic Board Battery” and “No Power” topics later in this
chapter.
2.
Important:
The CPU uses a thermal pipe to transfer heat away. This pipe makes a thermal connection to
the top metal chassis (Faraday cage) at
two
locations. These connecting points must be cleaned and
have new thermal paste applied each time the bottom housing is removed. If the mating surfaces are not
cleaned and thermal paste is not used, the CPU may overheat and become damaged. There is no
exception to this.
Note:
Most service procedures require that the bottom housing is removed.
Refer to “Thermal Paste Application” mentioned later in this chapter or in the Take Apart
chapter.