Apple imac 20 inch early 2008 User Manual
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iMac (20-inch Early 2008) Take Apart — General Information 11 Product Configurations To confirm the configuration from the Apple menu, choose About This Mac. The Processor listing will show the speed of the processor followed by the processor type. The following table shows the iMac (20-inch Early 2008) model configurations at introduction: FeatureGood ModelBetter Model Intel Core 2 Duo processor 2.4 GHz 2.66 GHz Memory 1 GB (1 x 1 GB) 800 MHz DDR2 (4 GB max) 2 GB (2 x 1 GB) 800 MHz DDR2 (4 GB max) Hard Drive, Serial ATA 7200 rpm 250/320/500 GB 320/500/750 GB Optical Drive 8x PATA SuperDrive 8x PATA SuperDrive Display 20-inch, 1650x1080, Tn, 98ppi, 300nits Graphics M74 + 128 MB M76XT + 256 MB Audio I/O Combo digital in, Mic, Stereo speakers Wireless PCIe 802.11a/b/g/n, Bluetooth 2.1 Power Supply 180W Universal Opening the Computer Important: • The glass panel on the iMac should only be removed by Apple authorized technicians. Removing the glass panel requires special tools and they must be used to replace any module other than the SO-DIMMs. Read and follow all of the handling and cleaning recommendations to prevent damaging • the glass and LCD panel. Follow ESD precautions when the front bezel and the LCD display are removed. • Note About Images in This Manual Small differences in appearance between the images pictured and the actual computer you are servicing may exist, however the steps and sequence are the same unless otherwise noted.
iMac (20-inch Early 2008) Take Apart — General Information 12 Serial Number Location On the bottom of your iMac stand, you’ll find a label with the serial number printed on it. General Tools The following tools are required to service the computer: ESD-safe workstation and mat • Soft, clean towel or cloth (to protect the display and removed parts from scratches)• Black stick (or other nonconductive nylon or plastic flat-blade tool)• Phillips #2 screwdriver• Torx T6 screwdriver (magnetized)• Torx T8 screwdriver (magnetized)• Torx T10 screwdriver (magnetized)• Flat-blade screwdriver• Isopropyl alcohol• ESD bags• Required Special Tools Special tools are required to remove, handle, and clean the glass panel such as the following. View the tools in the Glass Panel take apart chapter. 922-8252 Suction cups, Pkg. of 2 1. 922-8261 Sticky silicone roller (6-inch) to clean the glass panel 2. 922-8262 Sticky sheet pads to clean the silicone roller 3. 922-8263 Polishing cloths, clean, anti-static, optical grade micro fiber “terry” style cloth4.
iMac (20-inch Early 2008) Take Apart — General Information 13 922-8253 Gloves, lint-free, anti-static, Pkg. of 2 5. 922-8259 Microfoam bag to store the glass panel, Pkg. of 56. 922-8258 ESD bags, 24x20, Pkg. of 5, to store the LCD panel. 7. Note: To prevent the buildup of static charges which may attract dust particles to the surface of the display, store the LCD panel in an anti-static bag whenever it has been removed from the system. iKlear Apple Polish or Brillianize anti-static spray cleaning solution. A list of where iKlear/ 8. Brillianize can be obtained is listed in the Glass Panel chapter of the service manuals. Note: IPA (isopropyl alcohol) can be used to clean the glass if you are unable to source iKlear or Brillianize. Cleaning Tools Starter Kit The following tools are offered in the starter kit (076-1277). Suction cups, one pair • Sticky silicone roller (6-inch) to clean the glass panel • Sticky sheets to clean the silicone roller, 2 pads• Polishing cloths, clean, anti-static, microfiber “terry” style cloth (5 cloths)• Gloves, lint-free, anti-static, two pairs • Microfoam bag to store the glass panel (5 bags) • ESD bag for LCD display storage, (5 bags)• Removing the Glass Panel Rubber suction cups (922-8252) and anti-static gloves (922-8253) are required to remove the glass panel. Lift the glass straight up and off the bezel. Review the movie in the Glass Panel chapter.
iMac (20-inch Early 2008) Take Apart — General Information 14 View Under the LCD Panel Note: To prevent the buildup of static charges which may attract dust particles to the surface of the LCD display, store the display in an anti-static bag whenever it has been removed from the system. View of the Main Modules
iMac (20-inch Early 2008) Take Apart — General Information 15 View of Inside the Rear Housing Inside the rear housing you can see the chassis, AC inlet filter, the mechanism, the hard drive fan, the DC/power supply/SATA/inverter cable, the microphone cable, the camera cable, and the antennas. Back View The input/output ports are located on the bottom left side on the back of the computer. The power on button is located on the bottom right side on the back of the computer.
iMac (20-inch Early 2008) Take Apart — General Information 16 I/O Ports The input/output ports from left to right are: Headphone out/optical digital audio out port • Audio in/optical digital audio in port • USB 2.1 ports (3) • FireWire 400 port • Firewire 800 port • Ethernet (10/100/1000 Base-T ) port • Mini-DVI port •
iMac (20-inch Early 2008) Take Apart — General Information 17 Cleaning and Handling 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. Note: To view the movie, make sure the manual is opened in Acrobat. The iMac (20-inch Early 2008) 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, handle the glass panel only by the edges while wearing lint-free • gloves. The complete list of tools and resources can be found in the Glass Panel take apart chapter.
iMac (20-inch Early 2008) Take Apart — General Information 18 Do’s and Don’ts 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. 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 wipe 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 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 iKlear to clean the glass. • Handling a Broken Glass Panel The glass panel is not tempered and will break into sharp pieces if mishandled. If the glass is broken it must be carefully removed from the iMac to prevent irreparable damage to the front surface of the LCD. If the front surface of the LCD is scratched by the broken glass the LCD may need to be replaced. Do not handle broken glass unless you are wearing protective cut-resistant gloves. The lint-free gloves used to prevent contamination of the glass panel are not suitable for handling broken glass. Use a broom and dust pan to sweep up as much of the broken glass as possible. Glass fragments may have travelled several feet from the location of the glass panel so be sure to thoroughly clean the entire area. Use a vacuum to remove the smaller fragments not picked up by the broom.
iMac (20-inch Early 2008) Take Apart — General Information 19 Safety WARNING: HIGH VOLTAGE: The highlighted module below is an AC/DC power supply that poses a shock hazard. When the computer is under power, be aware that the power supply contains high voltages that pose a potential hazard to your personal safety. Never work on or near the power supply with the unit powered on; and as a further precaution, always make sure the unit is unplugged when working on it with the front bezel removed. A white, shock- hazard warning symbol is silk-screened in the middle of the power supply module. WARNING: Text or photographs marked by this symbol indicate that a potential hazard to your personal safety exists from a high voltage source. The AC/DC power supply board is a high-voltage source with the unit under power, and remains powered up whenever the system is plugged in, whether or not the system is turned on. Use extreme caution when troubleshooting the system with the front bezel removed. Disconnect power to the system before performing maintenance. • Disconnect ESD wrist straps when working on a plugged in system. • Don’t work alone. In the event• of an electrical shock, it is important to have another individual present who can provide assistance. Keep one hand in your pocket when working on any • computer that is plugged in. This will help ensure that your body does not provide a path to ground in the event that you accidentally make contact with the line voltage. Don’t wear jewelry, watches, necklaces, or other metallic articles that could present a risk • if they accidentally make contact with the power supply circuitry .
iMac (20-inch Early 2008) Take Apart — General Information 20 EMI Shielding The rear cover of the computer is wrapped in EMI shielding that is easily torn and damaged. To maintain a properly shielded unit, you must repair all accidental tears and cracks to the shielding by covering them with EMI tape that can be ordered from Apple service.