Apple imac 20 inch early 2008 User Manual

iMac (20-inch Early 2008)  Take Apart 21 

iMac (20-inch Early 2008)  Take Apart — Access Door 22
Access Door
Tools
Phillips #2 screwdriver• 
ESD-safe workstation and mat• 
Soft , clean towel or cloth• 
Preliminary Steps
Before you begin, place the computer face down on a clean, soft, lint-free cloth so that the 
bottom is facing you.
Part Location 

iMac (20-inch Early 2008)  Take Apart — Access Door 23
Removing the Access Door
Disconnect all cables and the power cord from your iMac.1. 
Place a soft, clean towel or cloth on your work surface. Hold the side of the iMac and lay it 2.  
down so that the screen is against the surface and the bottom is facing you.
Raise the stand and use a Phillips #2 screwdriver to loosen the captive screw on the memory 
3. 
access door by turning it counterclockwise.  
Important: When removing and installing the RAM...

iMac (20-inch Early 2008)  Take Apart — Memory 24
Memory
Tools
ESD mat • 
Soft , clean towel or cloth• 
Preliminary Steps
Before you begin, remove the access door.
Warning: Always shut down the computer and remove the power cord before installing memory. 
Do not attempt to install memory in the computer while it is plugged in.
Part Location 

iMac (20-inch Early 2008)  Take Apart — Memory 25
Removing the Memory
Shut down the computer, and disconnect all cables including the power cord.1. 
Holding the sides of the computer, lay it face down on a soft, clean cloth so the stand is 2.  
facing you.
After removing the access door, touch the metal stand or bezel to discharge any static 
3. 
electricity from your body.  
Important: Always discharge static before you touch any parts such as the memory board. 
To avoid generating static electricity,...

iMac (20-inch Early 2008)  Take Apart — Memory 26
Untuck the tab in the memory compartment. Pull it to eject the installed memory module.
4.
 
Set the memory modules in an anti-static bag and set them aside.5.  

iMac (20-inch Early 2008)  Take Apart — Memory 27
Replacing the Memory
With the computer face down, orient the notch on the DIMM with the notch in the memory 1. 
slot. In this case, the notch is on the left.
 
With your fingers, press the DIMM fully into the slot until you hear a click. Repeat for the 2.  
other DIMM slot.
Fold the black tab over each DIMM. 
3. 
Replace the 4. memory access door.
Use a Phillips #1 screwdriver to tighten the captive screw on the memory access door.
5. 
Make sure the...

iMac (20-inch Early 2008)  Take Apart — Glass Panel 28
Glass Panel
Tools
This procedure requires the following tools, which are offered individually or as part of the 
cleaning kit, 076-1277.
Suction cups (922-8252)
• 
Sticky silicone roller (6-inch) to clean the glass panel (922-8261)• 
Sticky sheets to clean the silicone roller (922-8262)• 
Polishing cloths, clean, anti-static, optical grade micro fiber “terry” style cloth (922-8263)• 
iKlear Apple Polish or Brillianize anti-static spray cleaning...

iMac (20-inch Early 2008)  Take Apart — Glass Panel 29
This iMac model has a glass panel that attaches to the outside of the front bezel. The glass panel 
is not tempered and will break into sharp pieces if mishandled. A scratched or broken glass panel 
is not covered under warranty. Removing the glass panel requires special tools such as lint-free 
gloves, rubber suction cups, microfoam storage bags, and the iKlear cleaning solution. 
The glass 
panel must be removed prior to replacing any module other...

iMac (20-inch Early 2008)  Take Apart — Glass Panel 30
Isopropyl Alcohol (IPA)
Cleaning the Glass
In the unfortunate event that gloves are not worn, and fingerprints and oil smudges are visible 
on the inside of the glass, cleaning should be done using a lint free cloth and IPA. Spray a small 
amount of IPA onto a CLEAN lint free cloth to avoid introducing any other contaminants.  Gently 
wipe the area and allow the glass to dry.  Note: The silicone rollers are only effective in removing 
dust and other...