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Apple imac 20 inch early 2008 User Manual

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    							iMac (20-inch Early 2008)  — Symptom Charts  271
    Keyboard is not discoverable
    To pair your aluminum Apple Wireless Keyboard with your Macintosh computer, the keyboard 
    needs to be in a ‘discoverable mode.’
    Note: If you need to put the older Apple Wireless Keyboard in a discoverable mode for pairing, 
    see the previous topic.
    Follow these steps to put the aluminum Apple Wireless Keyboard in a discoverable mode:
    Open the Bluetooth Setup Assistant on your Mac:1. 
    For Mac OS X 10.4.10 or late•	r
    For Mac OS X 10.5 or late•	r
    Turn on the keyboard by pressing the Power button on the right side of the keyboard.  2.  
    The Power On light (top right corner) will begin to blink and the Setup Assistant can then 
    scan for the keyboard in order to pair it to your computer.
    Follow the onscreen instructions to complete pairing your keyboard.3. 
    Wireless Keyboard Connection Lost
    The following image appears on the desktop:1. 
    Reset the Apple Wireless Keyboard. Turn the power switch off for several seconds, and turn it 2.  
    back on. Wait a few moments after turning on the keyboard so that it can pair itself to your 
    computer.  If the keyboard is still not discoverable, go on to the next step.
    Follow the steps listed in the previous symptom, “3. Keyboard is not discoverable.” 
    						
    							iMac (20-inch Early 2008)  — Symptom Charts  272
    Some keys are working on the Wireless keyboard
    If some keys are working, but others behave as if the Caps Lock is “ON”, and the customer was  
    using an extended keyboard (with a number pad),  but switched to an Apple Wireless keyboard, 
    check the following setting and try the wireless keyboard again.
    Turn “Off” Mouse Keys under System Preferences-->Universal Access-->Mouse. •	
    Additional Wireless Topics
    Can’t wake the computer with the wireless keyboard or wireless mouse
    Refer to Knowledge Base document 86496 - Apple Wireless Keyboard and Mouse: 
    Troubleshooting connection Issues.
    Can’t maintain a wireless connection between the computer and keyboard or 
    mouse
    Refer to Knowledge Base document 86496- Apple Wireless Keyboard and Mouse: 
    Troubleshooting connection Issues.
    Using the an Apple Wireless Keyboard and Mouse
    Refer to Knowledge Base document 306461 - Using an Apple Wireless Keyboard and Mouse. 
    						
    							iMac (20-inch Early 2008)  — Symptom Charts  273
    Bluetooth: How to Set Up Your Apple Wireless Mouse
    Refer to Knowledge Base document 86468 - Follow the instructions in this document to set up 
    your Apple Wireless Mouse.
    Bluetooth: How to Se Up your wireless Mighty Mouse
    Refer to Knowledge Base document 303921 - Follow the instructions in this document to set up 
    your Apple Wireless Mighty Mouse. 
    						
    							iMac (20-inch Early 2008)  — Symptom Charts  274
    Error Beep(s)
    Power On Self Test (POST) Tones
    Intel-based Mac computers such as the iMac (20-inch Mid 2007) rely on a combination of tones 
    and blinking LEDs to display Power On Self Test (POST ) error codes.
    If the computer detects out-of-specification or no SDRAM or the RAM installed does not • 
    meet the appropriate specifications, the screen will remain black but the computer will beep  
    This error condition may be due to physically damaged RAM, installing the incorrect type of 
    RAM, or not having RAM installed.
    Some RAM may appear to pass the Power-On-Self-Test (POST ) but still cannot be used by • 
    the operating system. In this case, the computer will display a gray screen, sound three tones 
    and repeat the tones until the computer is turned off. 
    The solution to both of these situations is to first re-seat the memory and test the computer • 
    again. If the memory fails the POST test again, try memory that has been verified to work 
    correctly on another system (i.e., “known-good”) or order new memory.
    iMac display is black and the system beeps nine times (3 short, 3 long, 3 short), 
    then repeats
    In order to recover from this error condition perform the following steps:
    Disconnect the power cord from the iMac1. 
    Remove the memory access door.2.  
    Remove the glass panel.3. 
    Remove the front bezel.4. 
    Remove the small coin battery located on the logic board near the right speaker. Wait 30 5. 
    seconds.
    Reinstall the battery.6. 
    Connect the power cord to the iMac.7. 
    Verify that the system powers up correctly.8.   
    						
    							iMac (20-inch Early 2008) 
     — Symptom Charts   275
    USB
    USB port is not recognizing known devices
    Please unplug all of your USB devices from your iMac except your Apple Keyboard and Apple 1. 
    mouse.
    Now plug your device directly into the back of your iMac. Does it work as expected now? 2.  
     
    Yes: Your device works when plugged directly into the computer. This indicates a conflict 
    with one of the other USB devices. You can test by gradually adding your devices back and 
    seeing where the issue occurs, then contacting the manufacturer of the device for assistance. 
     
    No: Unplug your device from the iMac and plug the keyboard into the port your device just 
    occupied. Is your keyboard still working? 
     Yes: Your Apple Keyboard works when plugged into the USB port your device was 
    plugged into. This points to an issue with your device. Please review the documentation that 
    came with your device. Install any necessary drivers and contact the manufacturer of your 
    device for assistance. 
     No: Replace the logic board
    I see a message saying not enough power to function
    It appears that this device needs to be plugged into the computer’s USB port, rather than the 
    keyboard USB port. Any USB device connected to the keyboard needs to be either a self-powered 
    device (a USB device with its own AC power supply), or a low-power device (a device that does 
    not need a large amount of voltage to operate). Your device may draw more power than the 
    keyboard can provide. 
    						
    							© 2008 Apple Inc. All rights reserved.
     Service Source 
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    iMac (20-inch Early 2008) 
    						
    							iMac (20-inch Early 2008)  Take Apart 278
    iMac (20-inch Early 2008)—Upper Exploded View
    LVDS Cable
    922-8197
    LCD Assembly, 20”
    661-4671Front Bezel
    922-8582
    Glass Panel, Cover
    922-8514
    LCD Temp Sensor 922-8235
    Cable, LCD Temp Sensor 922-8234
    Clip, Temp Sensor
    922-8183
    Power Supply
    661-4670, 180W
    Hard Drive
    661-4632, 250 GB, 7200, SATA
    661-4633, 320 GB, 7200, SATA
    661-4634, 500 GB, 7200, SATA
    661-4635, 750 GB, 7200, SATA
    Optical Drive, 8x 
    661-4637
    Optical Sensor Cable
    922-8194
    Cable, Optical Flex, DATA
    922-8502
    Clip, Optical Bd
    922-8214
    Cable, HD Sensor922-8196
    Clip, Hard Drive922-8517
    Clip, Temp Sensor  Pkg of 5
    922-8183
    Cable, HD SATA 922-8195
    Pins, Hard Drive922-7001
    Speaker, right
    922-8506
    Speaker, Left922-8505
    Cable, AmbientTemp Sensor 922-8191 
    						
    							iMac (20-inch Early 2008)  Take Apart 279
    iMac (20-inch Early 2008)—Lower Exploded View
    Video Card
    661-4672, ATI Radeon HD 2600XT
    661-4673, ATI Radeon HD 2400XT
    SDRAM Access Door
    922-8186
    Logic Board
    661-4674, 2.4 GHz
    661-4675, 2.66 GHz
    Cable, 
    Ambient Temp Sensor 922-8191
    Stand
    922-8518 Microphone Cable
    922-8190
    Mechanism, 20”
    922-8221 Camera Cable
    922-8189
    Rear Cover
    922-8515 Cable, AC / DC / 
    SATA Power / Inverter
    922-8188
    IR Board
    922-8169
    Cable, IR
    922-8504
    SDRAM 
    661-4661 1 GB, DDR2-800, SO-DIMM
    661-4662 2 GB, DDR2-800, SO-DIMM
    Mechanism Cover
    922-8220
    Inverter Cover922-8215
    Inverter Board 922-8507
    Cable Cover, w/gasket 922-8516
    Camera Board922-8511
    Audio Board922-8466
    Cable, Audio Board 922-8463
    Bluetooth Board
    922-8467
    Cable, Bluetooth Board
    922-8503AirPort Card
    661-4594
    Temp Sensor Cable
    922-8191
    CPU Fan
    922-8509
    Optical Fan
    922-8508Hard Drive Fan 922-8510
    Ambient Temp Sensor 922-7792 
    						
    							iMac (20-inch Early 2008)  Take Apart — Screw Chart 280
    Screw Chart
    Screw Chart: Page 1 of 3 
    Note: Screws are not to scale.
    922-6800
    T10
    - Logic board to rear cover (4)
    -Power supply to rear cover 
    (2)
    - AC power inlet to rear cover 
    (3)
    - Cable guide to rear cover
    922-6850
    T10
    Chassis to rear cover (6)
    922-8250 
    T10
    Chassis to rear housing, at 
    top of chassis (3)
    922-7010 
    T6
    - Bluetooth card to Logic 
    - AirPort card to Logic
    - LVDS cable to Logic 
    - Audio board
    922-8256
    T6
    IR board to heatsink (2)
    922-8171
    T8
    Camera assembly to rear 
    housing 
    						
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