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Apple imac 20 inch mid 2009 User Manual

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    							iMac (20-inch, Early/Mid 2009) Basics — Overview 11 2010-11-24
    Overview
    Product Features
    The iMac (20-inch, Early 2009) and iMac (20-inch, Mid 2009) computers have the same overall 
    look as the previous generation aluminum iMac.  Distinguishing exterior features are Mini 
    DisplayPort (instead of mini DVI port) and 4 USB ports (instead of 3) on the rear, and a tapered 
    front edge on the stand.
    New features:
    • Increased processor speed: 2.66GHz
    •  Mini DisplayPort
    •  4 USB 2.0 ports
    •  Increased RAM capacity: 2GB min, 8GB max
    •  Increased hard drive capacity in Early 2009 model: 320/640/1TB
    Differences Between Models
    The iMac (20-inch, Early 2009) and iMac (20-inch, Mid 2009) computers are very similar.  The 
    differences are that the Mid 2009 model does not have IR (Infrared) or Bluetooth, and has a 
    smaller capacity hard drive (160GB).  
    						
    							iMac (20-inch, Early/Mid 2009) Basics — Overview 12 2010-11-24
    Product Configuration
    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 configuration at introduction:
    FeatureSpecification
    Processor 2.66 GHz Intel Core 2 Duo 
    6MB shared L2 cache, 1066MHz frontside bus
    Memory 2GB (2 x 1GB) 1066MHz DDR3 (optional 4GB, 8GB CTO)
    Hard Drive Early 2009: 320GB Serial ATA 7200-rpm (optional 640GB, 1TB)
    Mid 2009: 160GB Serial ATA 7200-rpm 
    Optical Drive 8x SATA SuperDrive
    Display 20-inch, 1680x1050 resolution, 800:1 contrast ratio, 290 cd/m brightness, 
    160-degree viewing angle, glossy
    Graphics NVIDIA GeForce 9400M with 256MB shared memory
    Wireless AirPort Extreme 802.11a/b/g/n, Bluetooth 2.1 + EDR (only in Early 2009)
    Input Devices wired keyboard, wired mouse, no remote, no modem
    I/O Gigabit Ethernet, (4) USB 2.0, (1) FireWire 800
    Audio I/O iPhone headset connector, microphone, stereo speakers, combo digital in
    Video I/O Mini-DisplayPort (HDCP, dual-link, dual display; simultaneously supports 
    full native resolution on built-in display and up to 2560x1600 on an 
    external 30-inch display), iSight camera
    Power Supply 180W universal
    Serial Number Location
    The iMac (20-inch, Early/Mid 2009)’s serial number is located on the base of the stand.  When 
    replacing a stand, transfer the serial number to the new stand.   
    						
    							© 2009-2010 Apple Inc. All rights reserved.
     Apple Technician Guide 
    Troubleshooting
    iMac (20-inch, Early/Mid 2009)   
    						
    							iMac (20-inch, Early/Mid 2009) Troubleshooting — General Troubleshooting 14 2010-11-24
    General Troubleshooting
    Update System Software & Firmware
    Important: Ensure the correct version Mac OS X and latest software and firmware updates have 
    been applied before you begin troubleshooting. Computers sometimes exhibit symptoms that 
    indicate the wrong Mac OS X system software is installed. 
    Firmware is the name given to software that is written into memory circuits such as flash 
    memory, that will hold the software code indefinitely, even when power is removed from 
    the hardware. Firmware on Intel Mac computers is designed to be updated if necessary by 
    running the Mac OS X Software Update check (available in the Apple menu) while computer is 
    connected to the Internet. For more information about firmware updates, refer to: 
    kBase #HT1557: About firmware updates for Intel-based Macs 
    kBase #HT1237: EFI and SMC firmware updates for Intel-based Macs
    Troubleshooting Theory
    For general information on troubleshooting theory, go to GSX and find the Service Training 
    course menu link. From there you can access the Troubleshooting Theory self-paced course.
    Hardware vs. Software
    For information on how to isolate a hardware issue from a software issue, refer to:  
    kBase #TS1388: Isolating issues in Mac OS X
    For information on how to troubleshoot a software issue, refer to:  
    kBase #HT1199: Mac OS X: How to troubleshoot a software issue 
    kBase #TS1394: Mac OS X: Troubleshooting installation and software updates 
    kBase #HT2956: Troubleshooting Mac OS X installation from CD or DVD
    Apple Hardware Test
    There are two versions of Apple Hardware Test (AHT ) for the iMac (20-inch, Early 2009).  To 
    identify which version of AHT to use, check the third, fourth, and fifth digits in the system serial 
    number.  See examples below.
    •  Apple Hardware Test 3A156 to be used on systems with the third, fourth, and fifth serial 
    number digits below 913.  Example: Serial number W 8 9 1 0 S M R D W K
    •  Apple Hardware Test 3A168 to be used on systems with the third, fourth, and fifth serial 
    number digits equal to or higher than 913.  Example: Serial number W 8 9 1 3 8 M T 0 T F
    The iMac (20-inch, Mid 2009) uses Apple Hardware Test 3A168.  
    						
    							iMac (20-inch, Early/Mid 2009) Troubleshooting — General Troubleshooting 15 2010-11-24
    Apple Service Diagnostic
    The correct version for all iMac (20-inch, Early/Mid 2009) is Apple Service Diagnostic 3S131.
    Common Reset Procedures
    Power On Self Test (POST )
    Intel-based Mac computers such as the iMac 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.
    For more information, refer to:  
    kBase #HT2538: iMac (Mid 2007) and later models: About new startup tones
    Starting Up in Safe Mode
    A Safe Boot is a special way to start Mac OS X when troubleshooting. Starting up into Safe 
    Mode does several things that can help resolve software or directory issues that may exist on 
    the startup volume. To start up in Safe Mode:
    1.   Make sure computer is shut down.
    2.  Press power button.
    3.   Immediately after you hear the startup tone, press and hold Shift key.  
    Note: The Shift key should be held as soon as possible after startup tone but not before.
    4.  Release Shift key when you see the screen with the gray Apple and progress indicator 
    (looks like a spinning gear). Note that booting into Safe Mode will take longer than a normal 
    startup. During startup, the words ”Safe Boot” appear on the Mac OS X startup screen and a 
    gray progress bar is displayed on bottom of window (since Mac OS X 10.6). 
    5.   To leave Safe Mode, restart computer normally, without holding down any keys during 
    startup.
    For more information, refer to:  
    kBase #HT1564: Mac OS X: What is Safe Boot, Safe Mode? 
    kBase #TS1884: Safe Boot takes longer than normal startup  
    						
    							iMac (20-inch, Early/Mid 2009) Troubleshooting — General Troubleshooting 16 2010-11-24
    Resetting Parameter RAM (PRAM)
    PRAM stores certain system and device settings in a location that Mac OS X can access quickly. 
    Exactly which settings are stored in the computer’s PRAM varies depending on the type of 
    computer as well as the types of devices and drives connected. To reset PRAM:
    1.  Shut down the computer.
    2.  Locate the following keys on keyboard: Command, Option, P, and R. You will need to hold 
    these keys down simultaneously in Step 4.  
    Note: If the keyboard does not have an Option key, use the Alt key instead.
    3.   Press power button.
    4.  Immediately press and hold Command-Option-P-R keys.  
    Important: You must press this key combination before the gray screen appears.
    5.   Hold down keys until the computer restarts, and you hear the startup chime a second time.
    6.  Release keys.
    For more information, refer to:  
    kBase #HT1242: Mac OS X: What’s stored in PRAM
    kBase #HT1379: Resetting your Mac’s PRAM and NVRAM
    Resetting the System Management Controller (SMC)
    The System Management Controller (SMC) is a chip on logic board that controls all power 
    functions. If computer is experiencing any power issue, such as not starting up, not displaying 
    video, sleep issues, or fan noise issues, resetting SMC may resolve it. To reset SMC on an iMac:
    7.   From Apple menu, choose Shut Down (or if the computer is not responding, hold power 
    button for approximately ten seconds until it powers off ).
    8.  Unplug all cables from computer, including power cord.
    9.   Press and hold the power button for 5 seconds.
    10.  Release the power button.
    11.  Attach the computer’s power cable, making sure power button is not being pressed.  
    Note: If you press the power button while inserting the power cord, the iMac will enter a 
    mode in which the fans run at full speed.  For more information, refer to:  
    kBase #TS1433: iMac: Fans run at full speed after computer turns on
    12.  Press the power button to turn on the computer.
    For more information, refer to:  
    kBase #HT1543: Intel-based iMacs: Resetting the System Management Controller (SMC)  
    						
    							iMac (20-inch, Early/Mid 2009) Troubleshooting — General Troubleshooting 17 2010-11-24
    Diagnostic LEDs
    The iMac has built-in diagnostic LEDs on the main logic board that can help you to 
    troubleshoot the computer. The LEDs are located to the right of the battery (see photo below). 
    LED #1 Indicates the trickle voltage from the power supply has been detected by the logic board. 
    This LED will remain ON whenever the iMac is connected to a working AC power source. 
    The LED will remain on even when the computer has been shut down or put to sleep. The 
    LED will turn off only if the AC power source is disconnected or the power supply is faulty.
    LED #2 Indicates the main logic board has detected proper power from the power supply when 
    the computer is turned on. This LED will be ON when the computer is turned on and the 
    power supply is working correctly.
    LED #3 Note:  This LED is not used on systems that have integrated graphics, which includes all 
    configurations of the iMac (20-inch, Early/Mid 2009).
    LED #4 Indicates the computer and the LCD display panel are communicating. This LED will be ON 
    when the computer is turned on and video signal is being generated. If the LED is ON and 
    there is no image on the LCD display panel, the LCD display panel or inverter might be 
    installed incorrectly or need replacement.  
    						
    							iMac (20-inch, Early/Mid 2009) Troubleshooting — General Troubleshooting 18 2010-11-24
    Sensor and Fan Connector Locations
    Ambient temp sensor and fan connector locations are shown below.  Ensure cables are 
    correctly routed and the sensors and fans are properly connected.  If a sensor or fan is faulty or 
    not connected, Apple Hardware Test will generate an error code.  
    						
    							iMac (20-inch, Early/Mid 2009) Troubleshooting — General Troubleshooting 19 2010-11-24
    Block Diagram
    Refer to this diagram to see how modules are interrelated.   
    Note: The iMac (20-inch, Mid 2009) does not have IR or Bluetooth.
    MLB
    Ambient 
    Temperature Sensor
    802.11n
    Antenna
    Bluetooth
    Antenna
    Display
    Temperature Sensor
    AC/DCTemperature Sensor
    Hard Drive
    Temperature Sensor
    Optical Drive
     HD Fan
    ODD Fan
    CPU FanSO-DIMMSO-DIMM
    Speaker
    Speaker
    IR Sensor
    Audio Board
    Power Button
    AC Inlet
    CameraMicrophone
    Inverter
    Temperature 
    Sensor
    PCIe x1
    DDR3-1066 DDR3-1066 USB 2.0
    USB 2.0
    USB 2.0
    SATA IISATA II
    12V in 20” 
    Antenna  
    						
    							iMac (20-inch, Early/Mid 2009) Symptom Charts — Startup and Power 20 2010-11-24
    Symptom Charts
    Follow the steps in the order indicated below. If an action resolves the issue, retest the system 
    to verify. 
    Note: A compilation of Quick Check tables is available at:
    http://service.info.apple.com/QRS/en/quickreference.pdf
    Startup and Power
    No Power, Dead Unit
    Unlikely cause:  speakers
    Quick Check
    SymptomsQuick Check
    No Power, Dead Unit
    •  No power
    •  No fan spin
    •  No startup chime
    •  No image on external display
    •  No hard drive or optical drive 
    activity 
    •  Caps Lock LED on wired 
    keyboard doesn’t light when 
    pressed. 1.
      Verify power source.
    2.  Verify power cable.
    3.   Listen closely for signs of activity from system 
    including: rotating fans, hard drive or optical drive 
    activity, startup chime, etc.
    Deep Dive
    Check ResultAction Code
    1.   Power ON system. Verify if 
    there is any indication that the 
    system has powered up (fan 
    rotation, hard drive or optical 
    drive noise, backlight turns on). Yes
    The symptom is powering up. 
    Jump to Won’t Start Up.
    No Go to step 2.  
    						
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