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Apple power mac g4 quicksilver User Manual

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     TroubleshootingGeneral/Logic Board Troubleshooting  -   1 3 
    Note: 
     This entire procedure resets the computerÕs PRAM. Be sure 
    to reset the computerÕs time, date, and other system parameter 
    settings before returning the computer to the customer. 
    Logic Board LEDs: Power Mac G4 (all models except PCI 
    Graphics) 
    There is one red LED on the Power Mac G4 (AGP Graphics/Gigabit 
    Ethernet/Digital Audio/QuickSilver/QuickSilver 2002) logic 
    boards. It indicates that there is power to the board and does not 
    imply a fault condition. Hardware such as DIMMs and PCI cards 
    should not be installed or removed when the LED is on. 
    						
    							 
     TroubleshootingGeneral/Logic Board Troubleshooting  -   1 4 
    Power Macintosh G4 (PCI Graphics) 
    Processor Module 
    The logic board comes with a removable processor module. The 
    processor should rarely fail and should be replaced only as a last 
    resort. Processor modules can be ordered from Service.
    Note that when you replace the logic board on a Power Macintosh 
    G4 (PCI Graphics), you must also change the processor jumper 
    block and warranty sticker to be compatible with the processor 
    module. Failure to install the jumper block properly will result 
    in a unit that does not boot up. No jumper block is required for 
    Power Mac G4 (AGP Graphics/Gigabit Ethernet/Digital Audio) 
    processors.
    Refer to ÒProcessor ModuleÓ in the Take Apart chapter for more 
    information. 
    						
    							 
     TroubleshootingGeneral/Logic Board Troubleshooting  -   1 5 
    Resetting the Cuda Chip: Power Macintosh G4 (PCI 
    Graphics) 
    The Cuda is a microcontroller chip on the Power Macintosh G4 
    (PCI Graphics) logic board. Its function is to 
    ¥ Turn system power on and off.
    ¥ Manage system resets from various commands.
    ¥ Maintain parameter RAM (PRAM).
    ¥ Manage the real-time clock.
    Many system problems can be resolved by resetting the Cuda chip 
    (see the Symptom Charts for examples). Press the Cuda reset 
    button on the logic board to reset the Cuda chip. The Cuda reset 
    button is located on the logic board to the right of the battery. 
    Refer to the Logic Board Diagram earlier in this chapter for 
    location information. If you continue to experience system 
    problems, refer to ÒResetting the PCI Logic BoardÓ in this 
    chapter. 
    						
    							 
     TroubleshootingGeneral/Logic Board Troubleshooting  -   1 6 
    Resetting the PCI Logic Board 
    Resetting the logic board can resolve many system problems (see 
    the Symptom/Cure tables for examples). Whenever you have a 
    Power Macintosh G4 (PCI Graphics) computer that fails to power 
    up, you should follow this procedure before replacing any 
    modules. 
    1. Unplug the computer.
    2. Press the Power On button on the front of the unit.
    3 . Open the side access panel.
    4. Remove the battery from the logic board.
    5. Wait at least 10 minutes before replacing the battery. 
    6. Make sure the battery is installed in the correct +/- 
    direction.
    7 . Reassemble the computer and test the unit. 
    						
    							 
     TroubleshootingGeneral/Logic Board Troubleshooting  -   1 7 
    Note: 
     This procedure resets the computerÕs PRAM. Be sure to 
    check the computerÕs time/date and other system parameter 
    settings afterwards. 
    Logic Board LEDs: Power Macintosh G4 (PCI Graphics) 
    There are seven diagnostic LEDs on the Power Mac G4 (PCI 
    Graphics) logic board. A graphic follows showing their location.  
    DS1 = ATA drive activity 
    If a CD and/or Zip are attached to the ATA bus, this LED will 
    illuminate at power/on restart time for a few seconds. After that, 
    it is unlikely it will illuminate again in a trouble-free system. If 
    this light stays on for a prolonged period, this is a sign of trouble 
    on the ATA bus. If devices are connected to the ATA bus and this LED 
    is dark at boot time, that is also likely a sign of trouble. If a hard 
    disk drive is attached to this bus, the LED flickers regularly 
    indicating drive activity (reads/writes).  
    						
    							 
     TroubleshootingGeneral/Logic Board Troubleshooting  -   1 8 
    DS4 and DS5 = USB power for downstream devices 
    DS5 = USB port 1- lower
    DS4 = USB port 2- upper
    (There is no DS2 or DS3 on the board.)
    When illuminated, these LEDs indicate that the computer is 
    providing power (+5 V) to downstream USB ports. USB devices do 
    not need to be connected in order for these LEDs to illuminate. 
    However, if one or both of the LEDs is not illuminated and a USB 
    device is/was attached (and the system has completed its boot 
    process), then the logic board has removed downstream power 
    because of a trouble condition.
    Since the downstream power is controlled individually for each 
    port, it is possible to have these LEDs in a different state: one off 
    and one on. This way if one port has troubled USB devices, the  
    						
    							 
     TroubleshootingGeneral/Logic Board Troubleshooting  -   1 9 
    other port can still be functional. These LEDs are not immediately 
    illuminated at the beginning of a restart or cold power-on. During 
    a successful/normal boot, the sequence will look like:
    1. Unit is powered on and other LEDs will illuminate while DS4 
    and DS5 are off.
    2 . Then DS4 and DS5 on for a second or two
    3. Then off very briefly (1 second)
    4. Then back on (confirms secondary PCI bus is initialized and 
    power now available)
    These two LEDs are often useful when troubleshooting an 
    unpredictable system. If they stay on (step 4) then the secondary 
    PCI bus has been initialized which happens relatively late in the 
    boot/hardware initializing process. 
    						
    							 
     TroubleshootingGeneral/Logic Board Troubleshooting  -   2 0 
    DS6 = Ultra ATA bus activity 
    DS6 indicates Ultra ATA bus activity. 
    DS7 & DS8 = Power Indication 
    In a working unit, these LEDs should be in sync with each other: 
    both on or both off. If one LED is on and the other is off, there is a 
    problem.  
    DS9 = CPU Bus Request 
    When illuminated, this LED indicates that the CPU is requesting 
    the bus. This LED will rarely glow as brightly as the others (like 
    the Ultra ATA LED) given that the CPU is not always requesting the 
    bus, and when it does, the period of time is short. As a result, you 
    may need to watch this LED much more carefully than the others to 
    tell if there is activity. If this LED is ever on continuously and 
    bright, then the system is troubled and likely hung. 
    						
    							 
     TroubleshootingGeneral/Logic Board Troubleshooting  -   2 1 
    Power Macintosh G4 (PCI Graphics) LEDs Locator
    DS5
    DS9
    DS8
    DS7
    DS6
    DS1DS4 
    						
    							 
     TroubleshootingGeneral/Power Supply Verification  -   2 2 
    Power Supply VeriÞcation 
    To start up, the Power Mac G4 logic board requires a ÒtrickleÓ 
    power of +5V for AGP and PCI models, +28V for Gigabit Ethernet/
    Digital Audio models, or +25V for QuickSilver models. If the 
    system fails to start up, follow the procedure outlined below to 
    determine whether the problem is related to the power supply. 
    Note: 
     To verify the power supply, you need a volt meter. 
    VeriÞcation Procedure 
    Follow the procedures in the Take Apart chapter to access the 
    power supply. 
    Important: 
      For this verification procedure when connecting the 
    volt meter leads to specific pins, ensure the power supply cable 
    remains securely plugged into the power supply connector on the 
    logic board. 
    						
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