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Apple power mac g4 quicksilver User Manual

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     TroubleshootingGeneral/Block Diagrams -  3 
    Power Mac G4 (AGP Graphics) Block Diagram
    100 MHz
    memory bus100 MHz
    Max bus
    Microphone jack
    Headphone jack Ethernet port Firewire port
    Firewire port 32-bit
    66 MHz
    PCI busAGP
    2x slot AGP 2x bus
    PCI slots
    64-bit
    33 MHz
    PCI bus
    Backside
    L2 cachePowerPC G4
    microprocessor
    UniNorth
    memory
    controller
    and PCI
    bus bridge
    PMU99
    power
    controller
    Boot
    ROM
    Ethernet
    PHY
    Firewire
    PHY
    Ethernet
    controller
    Firewire
    controller
    Screamer
    sound IC
    Modem slot
    USB port A
    USB port B
    SDRAM DIMM
    slots
    Internal DVD-ROM
    connector
    KeyLargo
    I/O device
    and disk
    controller
    Internal Zip drive
    connector
    Internal hard drive
    connectors
    Main Logic Board Processor Module
    PCI-PCI
    bus bridge
    ATA 
    bus
    Ultra ATA bus
    Internal
    speaker
    connectorWireless
    LAN slot 
    						
    							 
     TroubleshootingGeneral/Block Diagrams -  4 
    Power Macintosh G4 (PCI Graphics) Block Diagram 
    						
    							 
     TroubleshootingGeneral/Power-On Self Test  -   5 
    Power-On Self Test 
    There is a power-on self test that resides in the ROM of the Power 
    Mac G4. This test automatically runs whenever the computer is 
    powered on after being fully shut down (the power-on self test 
    does not run if the machine is only restarted). If a problem is 
    detected during the test, you will not hear a normal startup chime. 
    Instead, the system will beep as explained below.
    Power Mac G4 (all models except PCI Graphics):
    ¥ 
    1 Beep: 
     No RAM is installed or detected.
    ¥ 
    2 Beeps:  
    Incompatible RAM types are installed (for example, 
    both SDRAM and EDO installed).
    ¥ 
    3 Beeps:  
    No RAM banks passed memory testing. 
    ¥ 
    4 Beeps:  
    No good boot images are detected in the boot ROM 
    (and/or there is a bad sys config block).
    ¥ 
    5 Beeps:  
    The processor is not usable. 
    						
    							 
     TroubleshootingGeneral/Power-On Self Test  -   6 
    Power Macintosh G4 (PCI Graphics):
    ¥ 
    1 Beep: 
     No RAM is installed or detected.
    ¥ 
    2 Beeps:  
    Incompatible RAM types are installed (for example, 
    both SDRAM and EDO installed).
    ¥ 
    3 Beeps:  
    No RAM banks passed memory testing. 
    ¥ 
    4 or 5 Beeps:  
    Bad checksum for the remainder of the boot ROM 
    block. The ROM is bad and probably cannot be fixed. 
    						
    							 
     TroubleshootingGeneral/ Logic Board Diagrams  -   7 
    Logic Board Diagrams 
    Power Mac G4 (QuickSilvers/Digital Audio) 
    Logic Board Diagram
    Battery PCI 
    Slots
    Power
    FireWire 
    Ports (2) USB 
    Ports
    A &  B
    Ethernet 
    Connector SDRAM
    DIMM 
    Slots
     SpeakerPMU Button Ultra ATA
    Connector
    Modem
    Connector
    Front Panel
    Board
    AirPort
    ConnectorMonitor 
    Card 
    Slot
    IDE
    Connector
    Single or Dual
    Processor Digital Audio  Jack
    Headphone Jack 
    						
    							 
     TroubleshootingGeneral/ Logic Board Diagrams  -   8 
    Power Mac G4 (AGP Graphics/Gigabit Ethernet) 
    Logic Board Diagram
    BatteryPCI Slots
    Power
    FireWire 
    Ports (2)
    Internal
    FireWire 
    Por t
    (not included
    on Gigabit
    models) USB 
    Ports
    A & BEthernet 
    Connector
    SDRAM
    DIMM Slots  Speaker PMU Button
    Ultra ATA
    Connector
    Modem 
    Connector
    
    Front Panel
    Board
    AirPort
    ConnectorMonitor 
    Card Slot
    IDE
    Connector
    Processor
    Plug-In
    Slot
    Sound In
    Sound Out 
    						
    							 
     TroubleshootingGeneral/ Logic Board Diagrams  -   9 
    Power Macintosh G4 (PCI Graphics) Logic Board Diagram
    J1 ATA-3
    (CD/DVD-ROM 
    and Zip Drive
    J15 Ultra DMA/33
    (ATA Drives)
    J23 Power
    Battery S5 Power Button
    S4 Cuda Button
    J8 CD Audio
    J31
    Front Panel
    BoardProcessor
    Plug-In
    SlotJ34
     SpeakerJ25
    Jumper Block 
    (w/sticker)J2 Firewire
    Power SDRAM
    DIMM Slots Modem 
    Connector
    
    USB 
    Ports
    A & B Sound In & 
    Sound Out
    Por ts Monitor Card Slot
    PCI Slots
    Ethernet Connector
    Firewire Ports (2)
    Firewire Card 
    						
    							 
     TroubleshootingGeneral/Logic Board Troubleshooting  -   1 0 
    Logic Board Troubleshooting 
    Power Mac G4 (all models except 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.
    Refer to ÒProcessor ModuleÓ in the Take Apart chapter for more 
    information. 
    Resetting the PMU on the Logic Board 
    The PMU (Power Management Unit) is a microcontroller chip that 
    controls all power functions for the computer. The PMU is a 
    computer within a computer. It has memory, software, firmware,  
    						
    							 
     TroubleshootingGeneral/Logic Board Troubleshooting  -   1 1 
    I/O, two crystals, and a CPU. Its function is to: 
    ¥ Tell the computer to turn on, turn off, sleep, wake, idle, etc.
    ¥ Manage system resets from various commands.
    ¥ Maintain parameter RAM (PRAM).
    ¥ Manage the real-time clock. 
    Important: 
      Be  
    very 
     careful when handling the main logic board. 
    Remove the battery when handling the logic board so the PMU is 
    not affected. The PMU is  
    very 
     sensitive and touching the circuitry 
    on the logic board can cause the PMU to crash. If the PMU crashes, 
    the battery life goes from about five years to about two days if the 
    PMU is not reset. The PMU chip is located on the underside of the 
    logic board at U20; refer to the Power Mac G4 (AGP Graphics/
    Gigabit Ethernet/Digital Audio) Logic Board Diagrams for the 
    location of the PMU button.
    Many system problems can be resolved by resetting the PMU chip. 
    Whenever you have a unit that fails to power up, follow this  
    						
    							 
     TroubleshootingGeneral/Logic Board Troubleshooting  -   1 2 
    procedure before replacing any modules: 
    1. Disconnect the power cord and check the battery in the battery 
    holder (BT1). The battery should read 3.3 to 3.7 volts. If the 
    battery is bad, replace the battery, wait ten seconds, and then 
    reset the PMU (refer to the next step). If the battery is good, 
    go to the next step.
    2. Press the PMU reset switch (S1) once on the logic board and 
    then proceed to step 3. Do  
    NOT 
     press the PMU reset switch a 
    second time because it could crash the PMU chip.
    3 . WAIT ten seconds before connecting the power cord and 
    powering the computer on. If the computer powers on, go to 
    the next step. If the computer does not power on, there is 
    something else wrong with the computer; refer to the 
    symptom/cure chart, ÒStartupÓ in this chapter.
    4. Run Apple Hardware Test and return the computer to the 
    customer. 
    						
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