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 access door it is important that you use 
the correct size Phillips screwdriver. Using one that is too small or too big may damage the 
screw head, and/or screwdriver. Before trying to remove the RAM access door screw, make 
sure that the screwdriver tip is in good shape without rounded edges and that it firmly seats 
into the screw head. If the screwdriver doesn’t seat well then do not use it.
If the RAM access door screw head has been severely damaged and cannot be removed with 
a Phillips #2 screwdriver you may be able to use a small jewelers flat blade screwdriver to 
engage the screw head and carefully remove it. In some cases it may be necessary to use a 
screw extractor tool. When using a screw extractor make sure that no metal shavings from 
the damaged screw drop inside the system. For more information on screw extractors and 
how to use them type ‘screw extractor’ into your favorite internet search engine.
Remove the access door.
4. 
Replacing the Access Door
Position the computer face down on a clean, soft, lint-free cloth so that the bottom is facing 1. 
you. 
Position the access door on the rear housing over the memory compartment. 
2.  
Use a Phillips #2 screwdriver to tighten the captive screw.3. 
Important4. : To ensure proper cooling the iMac should not be operated without the memory 
access door installed. 
						

							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, do not walk around the room until you have finished 
replacing the memory. 
						

							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 computer recognizes the new memory by opening System Profiler, clicking 6.  
More Info, and clicking Memory. 
						

							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 solution for the outside of the glass • 
Isopropyl alcohol (IPA) or•  LENSPEN to clean the inside of the glass 
Gloves, lint-free, anti-static (922-8253)
• 
Microfoam bag to store the glass panel (922-8259) • 
ESD bag for LCD display storage (922-8258)• 
Note: Tools without part numbers can be sourced directly from the vendor. Refer to “ Cleaning 
Tool Resource s” at the end of this chapter.
Part Location 
						

							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 than the SO-DIMM’s.  To prevent 
contamination, the glass panel must only be handled by the edges while wearing lint-free gloves. 
Cleaning and Handling of the Glass Panel
Follow the cleaning procedures in this manual to ensure the glass panel is free of dust and other 
particles before returning the computer to the customer. Refer to the movie in the sidebar for a 
cleaning and handling demonstration.  
Note: To view the movie, make sure the manual is opened in Acrobat. 
						

							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 particles. If fingerprints or oil smudges are not removed prior to using the roller, 
the silicone roller will transfer the fingerprints and oil smudges onto the glass. 
Cleaning the Silicone Roller
Clean the silicone roller by wiping it down with IPA (Isopropyl Alcohol) or washing it with warm 
soapy water.
DO
Handle glass panel using lint free gloves.• 
Use only a sticky silicone roller to clean the inside surface of the glass and the LCD panel.• 
Use iKlear • ONLY on the outside surface of the glass panel or use the LENSPEN.
Use Isopropyl alcohol or the LENSPEN to clean 
• ONLY the inside surface of the glass.
Place the glass panel into a clean protective microfoam bag when it is not installed on an 
• 
iMac.
Store the glass panel in a safe area where it will not be broken or damaged.
• 
Store the LCD panel in an anti-static bag to prevent the buildup of static charges which may • 
attract dust particles to the display’s surface.
Store the silicone roller and sticky paper within a temperature range of 39-104 degrees F 
• 
(5-40C).
Wash the silicone roller in warm soapy water or clean it by wiping it down with isopropyl 
• 
alcohol if the roller is no longer tacky. Replace the silicone roller if the tackiness does not 
return.
DO NOT
Touch the inside of the glass with bare hands or dirty gloves. Fingerprints will be very • 
difficult to remove.
Clean the inside surface of the glass or the LCD with iKlear or other cleaning solutions.
• 
Place the glass panel onto a work surface where it may collect dust and other contaminants • 
unless it has first been placed into its protective microfoam bag.
Use single wipe iKlear packets or other cleaning solutions to clean the glass.
•