Apple power mac g4 agp graphics 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.