Apple power mac g5 early 2005 User Manual
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166 Power Mac G5 Take Apart Part Location Procedure Lay the computer so that the front panel is facing down. Remove the black rubber cap that covers the power button LED. Using a flatblade jeweler’s screwdriver, pry up the metal C-ring that secures the power button board. 1. 2. 3.
Power Mac G5 Take Apart 167 Lift up and remove the power button board. Remove the metal activation ring that lies below the power button board. 4. 5.
168 Power Mac G5 Take Apart Remove the power button from the enclosure.6.
Service Source © 2005 Apple Computer, Inc. All rights reserved. Troubleshooting Power Mac G5
Power Mac G5 Troubleshooting 171 General Information Liquid Cooling System (LCS) The Power Mac G5 (June 2004 Dual 2.5 GHz/Early 2005 Dual 2.7 GHz) configurations use a liquid cooling system (LCS) to manage the temperature in the computer. The liquid cooling system is sealed and is designed to be opened only by an Apple Authorized Service Provider (AASP). To ensure proper safety and handling of the LCS system, please read the following information. General Safety Information The LCS cooling system fluid is predominantly water (80% or greater) with a mixture of corrosion inhibitors, antifreeze, and bacterial growth preventatives. In normal use in a non-leaking LCS there are no special handling considerations. However, if a leak in the system is suspected or discovered and the computer is plugged in, remove power to the computer by pulling power plug. Nitrile or rubber glove should be worn when handling an LCS module that is leaking or suspected to be leaking. Evidence of leaks would include corrosion around fittings in the LCS coolant system, a light green or red liquid present, or a slick or slimy feel when handling the part. For leaks or spills, wipe up the fluid using rags, paper towels, or other suitable materials. Dispose of all cleaning materials according to local laws and regulations (Refer to laws and regulations pertaining to disposal of Antifreeze). Do not combine used coolant with any other chemical. Place the failed LCS module (leaking or not) in the packaging that the replacement module came in. Follow the packaging instructions included with the replacement module. Failure to follow the instructions could damage your equipment and void warranty coverage. Safety Guidelines Below is a summary of first aid measures for exposure to the liquid. For complete instructions refer to the Material Safety Data Sheets (MSDS) for the liquid. The Safety Data Sheets can be found at http://www.apple.com/environment/resources/msds.html. Eyes: Immediately flush with plenty of water. If wearing contact lenses, after initial flushing, remove contact lenses and continue to flush for 15 minutes. Have eyes examined by a medical professional if irritation persists.
172 Power Mac G5 Troubleshooting Skin: Wash skin with running water. Remove contaminated clothing. The recommended flushing is 15 minutes if pain or irritation occurs. Seek medical attention if irritation or redness develops. Ingestion: Ingestion of this product, while unlikely to occur in its containment, may cause irritation of the mouth and throat, gastric upset, stomach ache, cramps, nausea and vomiting. If the product is swallowed, CALL PHYSICIAN OR POISON CONTROL CENTER FOR MOST CURRENT INFORMATION. If professional advice is not available, do not induce vomiting. Contaminated individuals should drink milk, egg whites, or large quantities of water. Never induce vomiting or give diluents (milk or water) to someone who is unconscious, having convulsions, or unable to swallow. DDR Memory In the Power Mac G5, DIMMs must be installed in pairs of equal size and speed. Use PC2700 DDR-SDRAM for 4-DIMM-slot computers and PC3200 DDR-SDRAM for 8-DIMM-slot computers. Memory from older Macintosh computers is not compatible. Do not try to install non-DDR memory as it will not fit in the DIMM slots and could cause damage. Important: Power Mac G5 (June 2004/Early 2005) computers support only 184-pin, 2.5 volt, DDR400-compliant (PC3200) DRAM DIMMs with a maximum of 4 GB or 8 GB depending on the configuration. Results of Mixing PC2100, PC2700, and PC3200 RAM The table below describes what happens if you install PC2100, PC2700, or PC3200 memory in either a 4-DIMM-slot or 8-DIMM-slot Power Mac G5 computer. Four-DIMM-Slot Systems When only PC2100 DIMMs are installedThe computer makes three single tones instead of the startup sound. The LED on the front of the computer flashes three times, and the computer does not startup. When a mix of PC2100, PC2700, or PC 3200 DIMMs is installed The computer starts up normally, but neither the computer nor Apple System Profiler recognizes the PC2100 memory. When only PC3200 DIMMs are installed in the slots The computer starts up normally and behaves as though PC2700 DIMMs are installed. When no memory is installed or memory is not installed correctly The computer does not make a normal startup sound. Instead, there is a single tone, and the computer’s front LED flashes about once every 5 seconds.
Power Mac G5 Troubleshooting 173 Eight-DIMM-Slot Systems When only PC2100 DIMMs are installedThe computer makes three single tones instead of the startup sound. The LED on the front of the computer flashes three times, and the computer does not startup. When a mix of PC2100, PC2700, or PC 3200 DIMMs is installed The computer starts up normally, but neither the computer nor Apple System Profiler recognizes the PC2100 memory. When no memory is installed or memory is not installed correctly The computer does not make a normal startup sound. Instead, there is a single tone, and the computer’s front LED flashes about once every 5 seconds. PCI and AGP Cards The Power Mac G5 computer has four expansion card slots, three of which accommodate Peripheral Component Interconnect (PCI) cards and one that accepts an advanced graphics port (AGP) video card. AGP cards and PCI cards have different connectors, so you cannot insert a PCI card into the AGP slot. Note: Maximum power consumption for all four expansion slots (the three PCI expansion cards and the AGP card) should not exceed 90 watts ( W ). AGP Slot 1PCI Slot 2 PCI Slot 3PCI Slot 4
174 Power Mac G5 Troubleshooting AGP Cards The AGP video card, installed in slot 1, contains the graphics processor unit (GPU) and provides the computer’s display ports. Slot 1 is designed specifically to accept AGP cards. Note: When certain high-end video cards are installed in the AGP slot, they block the adjacent PCI/PCI-X slot (slot 2). As a result, you can install PCI/PCI-X cards in slots 3 and 4 but not in slot 2. For specific card information, see the video card table in the “Video” topic in the Basics chapter. The Power Mac G5 (June 2004/Early 2005) models have the accelerated graphics port (AGP 8x Pro) bus. It’s an enhanced PCI bus with extra functionality to burst texture data and graphics across the port up to 8 times faster than a 66 MHz PCI port. The computer comes with a graphics card installed in the AGP 8x Pro slot and has either an ADC and DVI-I connector or dual DVI-I connectors. (See the “Video” topic in the Basics chapter.) The AGP bus is 1.5 V only and is not backward compatible. Older AGP cards will not work in these models. PCI Cards The remaining three expansion slots, labeled 2, 3, and 4, accommodate PCI cards up to 12 inches long. Depending on the Power Mac G5 model, you can install either PCI or PCI-X cards. Note: To determine if a Power Mac G5 computer can accommodate PCI-X cards, check the number of DIMM slots on the logic board. Computers with four DIMM slots have 33 MHz PCI slots and can’t use PCI-X cards; computers with eight DIMM slots can accommodate 100 and 133 MHz PCI-X cards. See the chart below. Card type PCI slot Card speed PCI* slots 2, 3, and 4 64-bit, 33 MHz PCI-X slots 2 and 364-bit, 100 MHz PCI-Xslot 464-bit, 133 MHz *The PCI slots can accommodate mixed-voltage (5.0 V, 12 V, or 3.3 V ) cards but only at 3.3 V signaling, with 32-bit or 64-bit data widths and a 33 MHz frequency. You can add a 66 MHz card to a 33 MHz PCI slot if the card can operate at the lower 33 MHz rate. Warning: Installing a PCI card that functions only at 66 MHz in a 33 MHz slot could damage the computer. However, cards that run at both 66 MHz and 33 MHz may be installed. Check with the card’s manufacturer to see if a 66 MHz card also works at 33 MHz.
Power Mac G5 Troubleshooting 175 Block Diagram The architecture of the Power Mac G5 computer is based on the PowerPC G5 microprocessor and two custom ICs: the U3 memory controller/bus bridge and the K2 I/O controller. 1.5 GbpsSerial ATA bus 10/100/1000Ethernet port Optical audio out S/PDIF AirPort antenna port 333/400 MHzDDR memorybus 800/900/1000 MHzbuses Optical audio in S/PDIF FireWire 400 port (front) 16-bit3.2 GBpsHyperTransport 8-bit1.6 GBpsHyperTransport 33 MHzPCIbus 8X AGP-Pro slot2.1 GBps PCI-X slots PMU99powercontroller BootROM Modem slot I2S USB 2.0 port (front)480 Mbps USB 2.0 port (rear)480 Mbps USB 2.0 port (rear)480 Mbps DIMM slots Internal hard driveconnectors FireWire 400 port (rear) FireWire 800 port (rear) Main logic board ATA/100 bus 12 Mbps USB 12 MbpsUSB 1.5 GbpsSerial ATA bus Internal opticaldrive connectorInternalspeaker AirPort ExtremeCard slot U3memorycontrollerand PCIbus bridge K2I/O deviceand diskcontroller Headphone jack Analog line-out Analog line-in FireWirePHY Audiocircuitry Bluetooth PCI USBcontroller Processor moduleProcessor module 64-bit PowerPC G5microprocessor 100 MHz 100 MHz 133 MHz PCI-Xbridge 32-bit out32-bit in32-bit in32-bit out Bluetooth antenna port 64-bit PowerPC G5microprocessor
176 Power Mac G5 Troubleshooting Thermal Calibration To ensure proper fan and temperature control in the Power Mac G5, you must run Apple Service Diagnostic whenever you replace a processor or logic board with a new processor or logic board. You must also run the diagnostic if you re-install the same processor but in a different connector from the one in which it was originally installed. Apple Service Diagnostic for Power Mac G5 is available as a download from http://www.info.apple.com/discimages/. Note: The calibration process of Apple Service Diagnostic requires a controlled environment to ensure accurate ambient temperature readings. Computers under test must have the transparent air deflector installed and the door sensor switch must be operable. Units under test should also be located away from heating and air conditioning ventilation systems and the fan exhaust of other machines. Ambient temperature should not go above 77 degrees Fahrenheit or 25 degrees Centigrade. Resetting the PMU on the Logic Board The PMU (Power Management Unit) is a microcontroller chip that controls all power functions for this computer. The PMU is a computer within a computer. 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 logic board. The PMU is very sensitive and touching the circuitry on the logic board can cause the PMU to crash. If the PMU crashes and is not reset, the battery life goes from about five years to about two days. Note: For the location of the PMU reset button, see “Logic Board Diagram” in the Views chapter. Many system problems can be resolved by resetting the PMU chip. When you have a computer that fails to power up, follow this procedure before replacing any modules: Disconnect the power cord and check the battery in the battery holder. The battery should read 3.3 to 3.7 volts. If the battery is bad, replace it, wait ten seconds, and then proceed to step 2. If the battery is good, go directly to step 2. Press the PMU reset button once and then proceed to step 3. Do not press the PMU reset button a second time because it could crash the PMU chip. Wait ten seconds before connecting the power cord and powering on the computer. If the computer does not power on, there is something else wrong with it; refer to the “Startup Failures” section of “Symptom Charts” in this chapter. Note: The above procedure resets the computer’s PRAM. After resetting the PMU, be sure to reset the time, date, and other system parameter settings. • • • • 1. 2. 3.