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Power Macintosh G3/Macintosh Server G3 (Blue and White)
Power Macintosh G3 (Blue and White), Macintosh Server G3 (Blue and White), Macintosh Server G3 with Mac OS X Server
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Hot Issues
Power Macintosh G3/Macintosh Server G3 (Blue and White)
Hot Issues
Introduction - 1
Introduction
This chapter is designed to highlight unique or high-priority product issues that you should be aware of before servicing the Power Macintosh G3 (Blue and White) /Macintosh Server G3 (Blue and White) computer. Note: To avoid confusion with other products called "G3", Service Source and Price Pages documentation added the words "Blue and White" after the product name. This chapter alerts you to important issues and provides pointers to other areas in the manual where more complete information can be found. To familiarize yourself with a new product family, always read the Basics chapter in its entirety. You should also refer to the Troubleshooting chapter for basic theory of operations information.
Hot Issues
Processor Module Vs. Card - 2
Processor Module Vs. Card
Whereas previous Power Macintosh computers featured a user-installable processor card, this logic board uses a processor module that must not be removed by the customer (see "Processor Module" in the Take-Apart chapter).
Processor Module Jumper
The Power Macintosh G3/Macintosh Server G3 logic board has a processor module jumper installed at J25. The processor jumper is color coded for the speed of processor module used (white jumper for 400 MHz, black jumper for 300 MHz, and blue jumper for 350 MHz). Failure to install the correct jumper may result in a computer that won't boot up. (See "Jumper Location) in the Troubleshooting chapter.
Hot Issues
Warranty Sticker - 3
Warranty Sticker
There is a warranty sticker that covers the processor module jumper. The customer's warranty is void if this sticker is tampered with. Service Providers must replace this sticker if they have removed it during servicing to protect the customer's warranty. (See "Processor Module" in the Take-Apart chapter.)
Power Supply Voltage Setting
There is a switch on the back of the power supply that controls the voltage setting. The voltage switch must be set correctly to avoid damaging the computer. (See "Voltage Switch" in the Basics chapter for more information, including an international voltage chart.)
Hot Issues
I/O Card - 4
I/O Card
Some I/O functions on the Power Macintosh G3/Macintosh Server G3 logic board are handled through a removable I/O card that must be installed for the computer to operate properly.
SDRAM DIMMS
The DIMM modules used in any previous Power Macintosh or Power Macintosh G3 computer model are not compatible with the Power Macintosh G3/Macintosh Server G3 (Blue and White) described in this manual. The SDRAM DIMM modules must be PC-100 compliant,168-pin, 3.3-volt, unbuffered, and rated at 125 MHz (8ns) or faster.
Hot Issues
SDRAM DIMMS - 5
Characteristics of the memory to be used in Power Macintosh G3/Server G3 (Blue and White) are:
· · · · · · · · · PC-100 SDRAM 3.3 Volt unbuffered ONLY 168 pin module Data width = 64 bits wide Contains a correctly programmed Serial Presence Detect ROM (256 bytes) Sizes of 32 MB, 64 MB, 128 MB in 64 Mbit technology are qualified. Sizes of 128 MB and 256 MB in 128 Mbit technology are qualified. Maximum DIMM height £ 2.0" PC-100 SDRAM includes a sticker that clearly shows "PC100"
Hot Issues
SDRAM DIMMS - 6 Do NOT use: · Parity SDRAM DIMMs. · ECC (error correcting) SDRAM DIMMs. · Registered or buffered SDRAM · DIMMs with fewer than 4 or more than 16 devices (irrespective of any PC-100 sticker or claims) (For more information see "SDRAM DIMMs" in the Basics chapter or refer to the Memory Guide.) "PC-100" is an Intel-driven standard for DIMMs compatible with Intel 100 MHz systems. Intel requires prominent marking of the DIMM as PC-100, and requires the speed code to be listed as well. Power Macintosh G3/Server G3 (blue and white) is compatible with 3-2-3 (slowest), 3-2-2, and 2-2-2 (fastest) speed codes. Power Macintosh G3/ Server G3 (blue and white) will read the presence detect ROM for information about all the DIMMs installed in the
Hot Issues
SDRAM DIMMS - 7 machine, and set memory timing equal to the slowest DIMM. Therefore, for maximum performance use only 2-2-2 speed codes. However, the difference in application performance between the speed codes is small. Power Macintosh G3/ Server G3 (blue and white) typically ships with a single 3-2-2 DIMM. This may change over time. Power Macintosh G3/Server G3 (blue and white) is NOT compatible with ALL defined PC-100 DIMM sizes and organizations. In particular, do not use DIMMs using 256 Mbit SDRAMs; also, do not use DIMMs employing 32-bit wide SDRAM's. Power Macintosh G3/Server G3 (blue and white) cannot use the older EDO or Fast Page Mode DRAMs. In general, you will not be able to re-use DRAM from past Macintoshes (8500, 8600, PM G3, iMac) in your Power Macintosh G3/Server G3 (blue and white). However, there have been some recent
Hot Issues
SDRAM DIMMS - 8 efforts to qualify PC100 SDRAM for later versions of G3. Zero MB of memory is soldered to the Power Macintosh G3/ Server G3 (blue and white) main logic board. If the all four of the DIMM slots are empty, the machine will not operate. A single-frequency tone will be generated indicating that no memory is installed. The DRAM DIMMs can be installed one or more at a time. There are no performance gains when two DIMMs of the same size are installed. Any supported size DIMM can be installed in any DIMM slot, and the combined memory of all of the DIMMs installed will be configured as a contiguous array of memory. Using all four of Power Macintosh G3/Server G3 (blue and white)'s DRAM DIMM slots, the maximum memory configuration will be 1024 Mbytes (1.0 Gigabyte). When using 256 Mbyte DIMMs in a Power Macintosh G3/Server G3
Hot Issues
SGRAM Video Memory - 9 (blue and white), be sure that the device technology that comprises the DIMM is 128 Mbit and not 64Mbit or 256 Mbit.
SGRAM Video Memory
The Power Macintosh G3 computer does not include built-in video RAM nor a slot for video RAM expansion on the main logic board. The accelerated graphics card installed in the computer includes 16 MB of SDRAM video memory and does not support video RAM expansion.
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Basics
Power Macintosh G3 (Blue and White) / Macintosh Server G3
Basics
Overview - 1
Overview
The Power Macintosh G3 computer is Apple's leading performance and multiple configuration system for creative content customers. This Power Macintosh G3 provides a fast system architecture supported by improved and faster microprocessors, memory access, PCI bus and I/O. Click the movie icon at theleft to view a QuickTime VR movie of the Power Macintosh G3.
Basics
Features - 2
Features
There are standard features available with every Power Macintosh G3 computer as well as build-to-order features that are optional. The standard and optional features are listed below: · Microprocessor : PowerPC G3 microprocessor running at a clock frequency of 300 MHz, 350 MHz, or 400 MHz depending on model and configuration. · Cache: 512 KB of back-side second-level (L2) cache on processor module. The cache runs at half the clock frequency of the microprocessor. · Processor system bus: 64-bit wide data and 32-bit wide address, 100 MHz clock, supporting split address and data tenures.
Basics
Features - 3 · RAM: four DIMM slots for 168-pin industry standard SDRAM (synchronous dynamic access memory) DIMMs (dual inline memory modules). Maximum memory with all four slots occupied is 1024 MB. · ROM: New World ROM-in-RAM implementation with 1 MB of BootROM. · Graphics acceleration: 2D and 3D hardware graphics acceleration using the ATI RAGE 128 GL graphics controller on the 66 MHz 2D/3D accelerated graphics card. Software support through Macintosh QuickDraw 3D and QuickDraw 3D RAVE (rendering acceleration virtual engine) APIs. · Sound: supports 16 bits/channel stereo input and output on built-in 3.5mm line-level stereo input and output jacks, one built-in speaker.
Basics
Features - 4 · Hard disks: Standard Macintosh configurations include one internal Ultra ATA hard disk, or one, two, or three internal Ultra2 LVD SCSI drives. · Expansion bays: three expansion bays, one of which is occupied by an Ultra DMA/33 hard disk or one Ultra2 LVD SCSI drive. Two bays are available for adding other devices connected to a PCI controller card. · CD-ROM drive: internal 24X-speed ATAPI CD-ROM drive. · DVD-ROM drive: optional ATAPI DVD-ROM drive providing support for 32X-speed CD-ROM and 5X-speed DVD-ROM media, as well as DVD-Video playback with DVD MPEG2 decode module. The DVD MPEG2 decode module is connected to the PCI graphics card in DVD configurations.
Basics
Features - 5 · Zip drive: optional 100 MB ATAPI Zip drive. If the Zip drive option is not installed at the time of purchase, data and power connectors are provided to add an ATAPI Zip drive to the system. A bezel for the Zip configuration will need to be installed. The Zip device should be deviceselect jumpered as Device 1. · USB ports: The computer comes with two USB ports; a USB mouse and a USB keyboard that has two additional USB ports. · ADB port: one ADB port for ADB devices or ColorSync control of Apple monitors. · Ethernet: built in Ethernet port for a 10Base-T and 100Base-TX operation with an RJ-45 connector. · FireWireports: two IEEE-1394 high-speed serial FireWire ports, which support transfer rates of 100, 200, and 400 Mbps. · Modem: optional Apple 56Kbps modem. The modem supports K56flex and V.90 modem standards.
Basics
Features - 6 · Keyboard: Apple USB keyboard with function keys and inverted-T cursor motion keys. It is also a bus-powered USB hub with two USB ports. · Mouse: Apple USB mouse operating as a low-speed (1.5 Mbps) USB device. · PCI card expansion slots: three slots for 33 MHz, 32-bit or 64-bit, up to a 12-inch PCI card; one slot for a 66 MHz 32-bit PCI card, normally occupied by the accelerated graphics card. · Power switch: soft power controlled from the Apple USB keyboard and front power button. · Voltage switch: can be set to either 115 for voltages of 100130 V or 230 for voltages of 200250 V, depending on the voltage where the computer is installed. The voltage selection must be set manually.
Basics
Features - 7 · Fan speed control: The speed of the fan is thermally controlled and is automatically set to the lowest possible speed to minimize noise. The fan speed varies according to the temperature inside the enclosure. This is a function provided by the fan, and is not under software control. · Energy saving: sleep, startup, and shutdown scheduling can be controlled with an Energy Saver control panel.
Basics
Build-to-Order - 8
Build-to-Order
The build-to-order options that follow are available from the Apple Store. For more information view the build-to-order options online at the following address: http:// store.apple.com. · Internal 56K modem · Ultra SCSI PCI card that comes with a 50 pin to 25 pin SCSI adapter · Ultra2 LVD SCSI PCI card, single channel · DVD-RAM (ATAPI) drive · Gigabit Ethernet PCI card · 36 GB Ultra2 LVD SCSI hard drive
Basics
Front and Rear View - 9
Front and Rear View
Basics
Right Side View - 10
Right Side View
Basics
Left Side View - 11
Left Side View
Basics
Internal Locator - 12
Internal Locator
Power Supply CD-ROM/DVD-ROM Drive Bay Zip Drive (optional) Fan Drive Bay 1 Drive Bay 2 Drive Bay 3 Monitor Card Logic Board
Basics
I/O Panel/Rear View - 13
I/O Panel/Rear View
FireWire Ports (2) (ADB) Port Ethernet Port (10/100 Twisted-pair) USB Ports (2) Sound Input Port Sound Output Port
Lockable Cover Latch
Internal Modem Card (optional)
Monitor Port (PCI Slot 1 or 2) Expansion Slots (PCI slots 2-4) Lock Down Location
Basics
Logic Board Diagram - 14
Logic Board Diagram
Monitor Card Slot PCI Slots J1 IDE J15 Ultra2 ATA J23 Power S5 Power Button S4 Cuda Button Battery J8 CD Audio J31 Processor J34 J25 Front Panel Plug-In Speaker Jumper Block Board Slot (w/sticker) J2 Firewire Power SDRAM DIMM Slots
VOID Warrenty Seal if Broken
Sound In & Sound Out Ports
USB Ports A&B
Ethernet Connector ADB Firewire Ports (2)
Modem Connector
Basics
RAM Expansion - 15
RAM Expansion
The Power Macintosh G3 logic board provides four PC-100 DIMM slots, supporting a maximum of 256 MB per DIMM, for a total of 1 GB. Compatible DRAM DIMMs must meet all the following specifications: · PC-100 Synchronous DRAM (SDRAM) · 3.3 volt · 64-bit wide, 168-pin module · Maximum of 16 memory devices on the DIMM · Unbuffered; do not use registered or buffered Synchronous DRAM (SDRAM) · Maximum height of 2.0 inches. DIMMs from older Macintosh computers may physically fit in the slots, but they are not compatible and should not be used.
Basics
RAM Expansion - 16 Note: Zero MB of memory is soldered to the Power Macintosh G3 logic board. If all four of the DIMM slots are empty, the machine will not operate. A single-frequency tone will be generated indicating that no memory is installed.
No Video RAM Expansion
The Power Macintosh G3 computer does not include built-in video RAM nor a slot for video RAM expansion on the main logic board. The accelerated graphics card that will be installed in the computer includes 16 MB of SDRAM video memory and does not support video RAM expansion.
Basics
RAM Expansion - 17
No L2 Cache Expansion
The back-side L2 cache is integrated into the design of the microprocessor module. No cache expansion is possible without replacing the entire module.
Basics
DVD-ROM and DVD MPEG2 Decode Card Module - 18
DVD-ROM and DVD MPEG2 Decode Card Module
The DVD-ROM drive configuration includes an DVD MPEG2 decode card module. The DVD MPEG2 decode card module supports viewing DVD video movies on a monitor connected to the 15-pin video output port on the PCI 2D/3D accelerated graphics card. DVD digital audio from the DVD media is sent to a DAC (digital-to-analog converter) and then to the Burgundy IC for analog stereo sound output to the currently selected sound output port.
Basics
Peripheral Component Interconnect (PCI) - 19
Peripheral Component Interconnect (PCI)
The Power Macintosh G3 computer includes four PCI expansion slots. Three of the slots are 5V, 64-bit, 33 MHz slots that support both 32-bit and 64-bit PCI cards that are compliant with the PCI V2.1 specification. The other slot, is a 3.3V, 32-bit, 66 MHz slot dedicated to a 2D/3D accelerated graphics card. The 66 MHz PCI slot conforms to the PCI V2.1 specification with the exception that its clock speed is fixed at 66 MHz so it does not accept 33 MHz cards. The 66 MHz PCI slot is keyed for 3.3V only operation. Older 5V cards cannot be installed in the 66 MHz PCI slot. The 3.3V 66 MHz PCI graphics card that comes installed in the 66 MHz PCI slot cannot be used in one of the 33 MHz PCI slots.
Basics
Peripheral Component Interconnect (PCI) - 20
Expansion Card Power Requirements
The combined power consumption of expansion cards must not exceed the limits specified for the Macintosh model. To avoid damaging the computer and expansion card, do not install any expansion card without first checking the documentation for that card. You can use the three 33 MHz expansion slots to install · three 15 W cards · one 15 W or 25 W card · two 15 W or 25 W cards · one 15 W card and one 25 W card
Basics
Drives Installed - 21
Drives Installed
There are five internal drive bays. Three are in the lower part of the computer and two are in front on top. In many configurations, a single hard disk occupies the rear position on the lower drive carrier, and a CD-ROM, DVD-ROM, or DVD-RAM drive and Zip drive fill the upper bays. The computer supports additional SCSI drives, which fit on the lower drive carrier. Depending on the configuration purchased, one or two additional SCSI drives can go in the unoccupied positions on the carrier. (Some drives also require a PCI card to function.)
Basics
Drives Installed - 22 The computer provides support for the following types of internal hard disk drives: · ATA devices (includes ATA, ATA-2, and ATA-3 devices, which are also called IDE or EIDE devices) · Ultra ATA devices (sometimes called ATA-4 devices) · Fast SCSI (with the PCI card) · Ultra SCSI (with the PCI card) · Standard SCSI (with the PCI card) · Wide Ultra SCSI devices (with the PCI card included in some configurations) · Ultra2 LVD SCSI devices (with the PCI card included in some configurations) · ATAPI drives, including CD-ROM, DVD-ROM, DVD-RAM, and Zip drives Standard Macintosh configurations include one internal Ultra ATA hard disk, or one, two, or three internal Ultra2 LVD SCSI drives.
Basics
Drives Installed - 23
Ultra ATA Drives
The Power Macintosh G3 accommodates one internal ATA device in the lower drive carrier. If the Power Macintosh G3 model has an Ultra ATA drive in it, the drive sits in the rear of the carrier in position number 3.
Ultra2 LVD SCSI Drives
Standard Macintosh configurations include one internal Ultra ATA hard disk, or one, two, or three internal Ultra2 LVD SCSI drives. If the model has at least one internal Ultra2 LVD SCSI drive, a PCI card and cable inside the computer, it is possible to connect additional internal and external Ultra2 LVD SCSI devices. You can connect up to three internal SCSI drives or connect additional SCSI devices to the port the card provides on the rear of the computer.
Basics
Drives Installed - 24 If the computer came with one Ultra2 LVD SCSI drive, it is installed in the lower drive in position 1, near the front of the computer. If it came with two drives, the second one is installed in position 2. If a third drive is installed, it's in position 3. The factory sets the drive in position 1 to start up. The startup drive can be changed in the Control Panel. Additional internal Ultra2 LVD SCSI devices connect to the data cable supporting the drive that came with the computer. This cable has a built-in terminator so you don't need to add one. You must assign a SCSI ID number to every additional device and the number must not conflict with the ID number already assigned to a drive on the SCSI chain. If the computer came with one Ultra2 LVD SCSI drive, it has ID 0. If the Macintosh came with two drives, they have ID 0 and 1. A third factoryinstalled drive has ID 2. The SCSI PCI card has ID 7.
Basics
Drives Installed - 25
Other Types of SCSI Drives
The SCSI card inside the Power Macintosh G3 supports other types of Wide Ultra SCSI drives, as well as Ultra2 LVD SCSI devices. However, if you mix the different kinds, the system will operate at the speed of the slowest device. If you want optimal performance using the card, use only Ultra2 LVD SCSI devices. To maintain optimal performance using another kind of SCSI device, add a PCI card that supports the device.
Basics
Drives Installed - 26
ATAPI CD-ROM Drive
The Power Macintosh G3 computer has a 24X-speed internal ATAPI CD-ROM drive. The CD-ROM drive supports the worldwide standards and specifications for CD-ROM and CDdigital audio discs described in the Sony/Philips Yellow Book and Red Book. The drive can read CD-ROM, CD-ROM XA, CD-I, and PhotoCD discs as well as play standard audio discs. The CD-ROM drive has a sliding tray to hold the disc. The drive features a mechanism that supports 4X, 8X, 12X, and 24X data transfer rates and a data buffer that further enhances performance. The CD is configured as device 0 (master) in a ATA Device 0/1 (master/slave) configuration. 0=master 1=slave
Basics
Drives Installed - 27
Optional ATAPI Zip Drive
The Zip drive is an ATAPI drive and is connected as device 1 (slave) in an ATA Device 0/1 (master/slave) configuration on the ATA-3 channel of the main logic board.
Optional DVD-ROM Drive
The optional DVD-ROM drive is fully compatible with existing CD-ROM media. The drive supports CD-ROM at 32x speed maximum and DVD at 5x constant linear velocity (CLV). The DVD-ROM drive supports the following disc formats: · DVD-ROM (One- or two-layer, one- or two-sided) · CD-ROM (Modes 1 and 2), CD-ROM XA (Mode 2, Forms 1 and 2), · CD-Audio, Photo CD, CD-RW, CD-R, CD-Extra · CD-I (Mode 2, Forms 1 and 2), CD-I Ready, CD-I Bridge · Video CD
Basics
I/O Ports - 28
I/O Ports
ADB Port
The Power Macintosh G3 computer has an Apple Desktop Bus (ADB) port for ADB devices and ColorSync control of Apple monitors. The (ADB) port is functionally the same as on other Macintosh computers.
USB Ports
The Power Macintosh G3 computer has two Universal Serial Bus (USB) ports that are used to connect the keyboard and mouse as well as additional I/O devices such as printers, scanners, and low-speed storage devices. The USB ports take the place of the serial I/O ports found on earlier Macintosh computers. The Power Macintosh G3 uses a USB keyboard and
Basics
I/O Ports - 29 mouse similar to the USB keyboard and mouse introduced with the iMac computer.
Keyboard
The computer comes with an Apple USB keyboard. An extension cable is provided for installations where the computer is located on the floor or away from the immediate desktop area.
Mouse
The Apple USB mouse is designed to work with the computer by way of the USB ports. The mouse case is round and has the same two-tone color design as the case of the computer.
Basics
I/O Ports - 30
FireWire Ports
The computer includes two external FireWire IEEE 1394 ports on the rear panel of the enclosure. The features of the FireWire ports are: · High-speed serial I/O supports 100, 200, and 400 Mbps (megabits per second) · Provide 15 watts of power when the computer system is on · Accepts external power input on FireWire bus when system is off
No SCSI Ports
The Power Macintosh G3 computer does not include built-in internal or external SCSI device connectors. Adding an internal or external SCSI device requires the use of a SCSI PCI card.
Basics
I/O Ports - 31
Ethernet Port
The Power Macintosh G3 computer has a built-in 10/100 Mbps Ethernet port. The user can connect it to either a 10Base-T or a 100Base-TX hub; the port will automatically sense which type of hub is connected. The connector for the Ethernet port is a an RJ-45 connector on the back of the computer. The Ethernet interface in the Power Macintosh G3 computer conforms to the ISO/IEC 802.3 specification, where applicable.
Basics
Internal Modem - 32
Internal Modem
The Power Macintosh G3 computer includes an option for an internal modem. The modem interface to the main logic board is a 70-pin connector. The external I/O connector for the modem is an RJ-11 connector located on the rear of the computer. The modem has the following features: · modem bit rates up to 56 Kbps (supports K56flex and V.90 modem standards) · fax modem bit rates up to 14.4 Kbps The modem appears to the system as a serial port that responds to the typical AT commands. The modem provides a sound output for monitoring the progress of the modem connection.
Basics
Sound - 33
Sound
The Power Macintosh G3 is not configured as a typical AV style Power Macintosh in that it does not have RCA jacks for sound in and out, nor additional video in and out ports. Instead is relies on external FireWire devices for providing advanced audio/video capabilities.
Sound System
The sound system for the Power Macintosh G3 computer supports 44.1 kHz 16-bit stereo sound output and input, available simultaneously. Like other AV class Macintosh computers, the sound circuitry and system software can create sounds digitally and either play the sounds through speaker inside the enclosure or send the sound signals out through the sound
Basics
Sound - 34 output jack. The Power Macintosh G3 computer also records sound from several sources: an analog sound source connected to the line-level sound input jack, analog sound from the modem card connected to the internal modem connector, or a compact disc in the CD-ROM player. With each sound input source, sound playthrough can be enabled or disabled.
Sound Output
The Power Macintosh G3 computer provides one 3.5-mm mini jack for sound output on the back of the enclosure. The output jack is connected to the sound amplifier; the mini jack is intended for connecting a pair of headphones or amplified external speakers. Inserting a plug into the sound output mini jack disconnects the internal speaker. The enclosure has one built-in speaker.
Basics
Sound - 35 The Burgundy IC provides the stereo sound output to both the internal speakers and the sound output jack. The sound output jack has the following electrical characteristics: · output sound signal to noise ratio (SNR) <90 dB unweighted (typical) when sound playback is from system hard disk drive or main memory · output sound SNR <80 dB unweighted (nominal) when playback is from CD · overall output sound SNR <90 dB unweighted (typical)
Sound Input
The Power Macintosh G3 computer provides a stereo sound input jack on the back of the enclosure for connecting an external PlainTalk microphone or other sound source. The sound input jack accepts a standard 3.5-mm stereophonic phone plug (two signals plus ground).
Basics
Sound - 36 Note: The Apple PlainTalk microphone requires power from the main computer, which it obtains by way of an extra-long, 4-conductor plug that makes contact with a 5-volt pin inside the sound input jack. The sound input jack has the following electrical characteristics: · input impedance: 20 kW · maximum input level without distortion: 2.5 V peak to peak (Vpp) maximum · line-level microphone voltage range of 0.28 V to 2.1 V peak to peak · input SNR <90 dB unweighted (typical) for recording to system hard disk drive or system main memory
Basics
Sound - 37
Digitizing Sound
The sound circuitry digitizes and records sound as 44.1 kHz 16-bit samples. If a sound sampled at a lower rate on another computer is played as output, the Sound Manager transparently upsamples the sound to 44.1 kHz prior to outputting the audio to the Burgundy sound IC. The preferred sound sampling rate for output is specified in the Monitors and Sound control panel when the sound input is not in use. The preferred output sampling rate is overridden by the setting of the input sampling rate, because the input and output sampling rates are physically locked together. The sound output sampling rate is always 44.1 kHz. When recording sound from a microphone, applications that are concerned about feedback should disable sound playthrough by calling the Sound Manager APIs.
Basics
- 38 The Burgundy IC provides separate sound buffers for input and for stereo output so that the computer can record and send digitized sound to the sound outputs simultaneously.
Basics
The Cuda Chip - 39
The Cuda Chip
The Cuda is a microcontroller chip. Its function is to · Turn system power on and off · Manage system resets from various commands · Maintain parameter RAM (PRAM) · Manage the Apple Desktop Bus (ADB) · Manage the real-time clock Many system problems can be resolved by resetting the Cuda chip (see Symptom Charts for examples). Press the Cuda reset button on the logic board to reset the Cuda chip. (The Cuda reset button (S4) is near the battery. See "Logic Board Diagram" earlier in this chapter.) If you continue to experience system problems, refer to "Resetting the Logic Board" in the Troubleshooting chapter.
Basics
Resetting the Logic Board - 40
Resetting the Logic Board
Resetting the logic board can resolve many system problems (refer to "Symptom Charts" for examples). Whenever you have a unit that fails to power up, you should follow this procedure before replacing any modules. 1 2 3 Unplug the computer. Remove the battery from the logic board.
4 5
Disconnect the power supply cable from the logic board and then press the Power On button. (See "Logic Board Diagram" later in this chapter to locate the Power On button.) Wait at least 10 minutes before replacing the battery. Make sure the battery is installed in the correct +/direction.
Basics 6
Resetting the Logic Board - 41 Reassemble the computer and test the unit.
Note: This procedure resets the computer's PRAM. Be sure to check the computer's time/date and other system parameter settings afterwards.
Basics
Voltage Switch - 42
Voltage Switch
The power supply is not self-configuring for different input voltages. The voltage switch is delivered preconfigured for the input voltage of the region in which the unit is originally purchased. If the computer is moved to another location where the input voltage is different, a voltage switch must be adjusted to accommodate the voltage change. The switch has two positions that support voltage ranges of 100 to 130 V or 220 to 270 V.
Basics
Repair Strategy - 43
Repair Strategy
Service the Power Macintosh G3/Macintosh Server G3 computers through module exchange and parts replacement. Customers can request on-site service from an Apple Authorized Service Provider Plus (AASP+) Apple Assurance (US only), or Apple Canada Technical Answerline (Cananda only). They can also choose carry-in service from an AASP.
Ordering
Apple Service Providers planning to support the computer systems covered in this manual may purchase Service modules and parts to develop servicing capability. To order parts, use the AppleOrder (US only) or ARIS (Canada only) system and refer to the Power Macintosh G3 (Blue and
Basics
Repair Strategy - 44 White) and Macintosh Server G3 (Blue and White) "Service Price Pages." Large businesses, universities, and K-12 accounts must provide a purchase order on all transactions, including orders placed through the AppleOrder (US only) or ARIS (Canada only) system.
USA Ordering
US Service providers not enrolled in AppleOrder may fax their orders to Service Provider Support (512-9088125) or mail them to Apple Computer, Inc. Service Provider Support MS 212-SPS Austin, TX 78714-9125
Basics
Repair Strategy - 45 For US inquiries, please call Service Provider Support at 800-919-2775 and select option #1.
Canadian Ordering
Canadian Service providers not enrolled in ARIS may fax their orders to Service Provider Support in Canada (1800-903-5284). For Canadian inquiries, please call Service Provider Support at 905-513-5782 and select option #3.
Basics
Warranty/AppleCare/ARIS - 46
Warranty/AppleCare/ARIS
US Only
The Power Macintosh G3 / Macintosh Server G3 computers are covered under the Apple One-Year Limited Warranty. The AppleCare Service Plan is also available for these products. Service Providers are reimbursed for warranty and AppleCare repairs made to these computers. For pricing information, refer to "Service Price Pages."
Canada Only
The Power Macintosh G3 / Macintosh Server G3 computers are covered under AppleCare. The Extended AppleCare Service Plan is also available for these products. Service Providers are reimbursed for warranty and AppleCare repairs made to these computers. For pricing information, refer to "Service Price Pages."
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Specifications
Power Macintosh G3 (Blue and White) / Macintosh Server G3
Specifications
Introduction - 1
Introduction
Specifications information for this product can be found in the Spec Database, which you can access in one of three ways: -- Launch it directly by double-clicking the Apple Spec Database runtime alias at the top level of the Main Service Source CD. -- Select "Apple Spec Database" from the Service Source drop-down main menu. -- Click the Acrobat toolbar icon for the database, which is near the right end of the toolbar with the letters "SP."
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Take Apart
Power Macintosh G3 (Blue and White) / Macintosh Server G3
Take Apart
- 1
Tools
· Flatblade screwdriver · Phillips screwdriver · Allen wrench (2.5 mm), to remove the power supply, side panels, top and rear handles, and front and rear supports · Jeweler's screwdriver, to remove the I/O panel cover · Needlenose pliers, to remove the right and left side panels · ESD Mat
Take Apart
Opening the Computer - 2
Opening the Computer
No preliminary steps are required before you begin this procedure.
Take Apart 1
Opening the Computer - 3 Lift the latch to unlock the right side panel. Note: Make sure security bar is in the unlock position.
2
Gently lower the side panel onto a clean, ESD mat, to avoid scratching the case. Lower the side panel until it lies flat.
Take Apart
Logic Board - 4
Logic Board
Before you begin, open the side access panel and remove the following: · PCI cards (if present) · Video card · FireWire board (if present) · Modem (if present)
Take Apart 1 2
Logic Board - 5 Disconnect all the cables from the logic board.
Using a Phillips screwdriver, remove the logic board mounting screws and standoff which attaches to the FireWire board (if present).
Take Apart 3
Logic Board - 6 Tilt the logic board so that the ports clear the openings in the I/O panel.
4
Lift the board out of the computer.
Important: If you are replacing the logic board, you must transfer the processor module, processor jumper, and DRAM from the original logic board to the replacement board. See the take-apart instructions for the "Processor Module" for more information. You must
Take Apart
Logic Board - 7 also cover the processor jumper with a new warranty sticker, which comes with the replacement logic board. This sticker must be in place to protect the customer's product warranty. Note: Before returning the logic board to Apple, remove the processor module, processor jumper block and warranty sticker, DRAM, the Video I/O card, and any PCI cards (if present).
Take Apart
Hard Drive, IDE /ATA - 8
Hard Drive, IDE / ATA
Before you begin, open the side access panel. Note: This computer can accommodate one internal ATA device in the lower drive carrier. If this model was purchased with an Ultra ATA drive in it, the drive sits in the rear of the carrier in drive bay 3.
Take Apart
Hard Drive, IDE /ATA - 9
Hard Drive Carriers: Version 1 and 2
Power Macintosh G3/Macintosh Server G3 computers use two different hard drive carriers for installing drives in the lower part of the unit. Version 1 carrier extends the width of the computer and holds up to three drives. Version 2 carrier is the width of a single drive; up to three carriers can be installed in the computer. Each version of carrier requires a unique procedure for removing/installing drives. Before beginning a drive Take Apart procedure, check to see if the computer uses a Version 1 or Version 2 drive carrier. Then proceed to the corresponding Version 1 or Version 2 steps included on the following pages.
Take Apart
Hard Drive, IDE /ATA - 10
Version 1
1 Disconnect the main power cable and the Ultra ATA hard drive data cable from the logic board.
l
2
3
Disconnect the hard drive power cable (P3) from the back of the hard drive in bay 3. Remove the screw securing the retainer to the hard drive carrier. Remove the hard drive retainer.
4
Take Apart 5
Hard Drive, IDE /ATA - 11 Slide the carrier toward the rear of the computer to unhook the carrier tabs from the chassis slots. Lift the carrier and drive out of the chassis.
Take Apart 6
Hard Drive, IDE /ATA - 12 Remove the four screws from the underside of the hard drive carrier. Lift the hard drive off the carrier.
7
Note: Return drives without cables or carriers. Exchange Apple hard drive modules in Apple packaging. Failure to comply with this requirement may result in a packaging noncompliance charge. Refer to the parts database for more information.
Take Apart
Hard Drive, IDE /ATA - 13
Version 2
1 Disconnect the Ultra ATA hard drive data cable and the hard drive power cable (P3) from the hard drive.
Take Apart 2
Hard Drive, IDE /ATA - 14 Remove the hard drive carrier mounting screw.
Take Apart 3
Hard Drive, IDE /ATA - 15 Pull the drive carrier back and lift up at an angle to release the carrier tabs from the slots in the chassis.
4
Remove the carrier and drive from the computer.
Take Apart 5
Hard Drive, IDE /ATA - 16 If you're returning the drive to Apple, remove the four screws from the hard drive carrier. Lift the hard drive from the carrier.
6
Note: Return drives without cables or carriers. Exchange Apple hard drive modules in Apple packaging. Failure to comply with this requirement may result in a packaging noncompliance charge. Refer to the service parts database for more information.
Take Apart
Hard Drive, Ultra2 LVD SCSI - 17
Hard Drive, Ultra2 LVD SCSI
Before you begin, open the right side access panel. Note: Standard Macintosh configurations include one internal Ultra ATA hard drive or up to three internal Ultra2 LVD SCSI drives. If the model has at least one internal Ultra2 LVD SCSI drive, an Ultra2 LVD SCSI PCI card, and a data cable inside the computer, you can connect additional internal
Take Apart
Hard Drive, Ultra2 LVD SCSI - 18 and external Ultra2 LVD SCSI devices. The data cable that came with the computer supports up to three internal SCSI drives; this cable has a built-in terminator so you don't need to add one. You can connect external Ultra2 LVD SCSI devices to the port on the rear of the computer. If the computer came with one Ultra2 LVD SCSI drive, it is installed in the lower part of the computer in drive bay 1, near the front of the computer. If it came with two drives, the second one is installed in bay 2. If a third drive is installed, it's in bay 3. Usually the computer uses the drive in bay 1 to start up. You must assign a SCSI ID number to every additional device and the number must not conflict with the ID number already assigned to a drive on the SCSI chain. One factoryinstalled drive has ID 0; a second factory-installed drive has ID 1; a third drive has ID 2. The SCSI PCI card has ID 7.
Take Apart
Hard Drive, Ultra2 LVD SCSI - 19
Hard Drive Carriers: Version 1 and 2
Power Macintosh G3/Macintosh Server G3 computers use two different hard drive carriers for installing drives in the lower part of the unit. Version 1 carrier extends the width of the computer and holds up to three drives. Version 2 carrier is the width of a single drive; up to three carriers can be installed in the computer. Each version of carrier requires a unique procedure for removing/installing drives. Before beginning a drive Take Apart procedure, check to see if the computer uses a Version 1 or Version 2 drive carrier. Then proceed to the corresponding Version 1 or Version 2 steps included on the following pages.
Take Apart
Hard Drive, Ultra2 LVD SCSI - 20
Version 1
1 Disconnect the Ultra2 SCSI data cable from the Ultra2 SCSI card.
Take Apart
Hard Drive, Ultra2 LVD SCSI - 21 2 Disconnect the main power cable and the SCSI hard drive power cable (P5). Replacement Note: The power cables attach to drives as follows: P5 attaches to bay 1 P2 attaches to bay 2 P3 attaches to bay 3
3 4
Remove the screw on the hard drive retainer. Remove the hard drive retainer.
Take Apart
Hard Drive, Ultra2 LVD SCSI - 22 5 Pull the hard drive carrier toward the rear of the computer to unhook the carrier from the chassis.
Take Apart
Hard Drive, Ultra2 LVD SCSI - 23 6 7 Lift the carrier and drive out of the chassis.
8
Remove the SCSI data cable and terminator (black plastic housing) from the top of the SCSI drive in bay 1. The SCSI cable and terminator are attached to the top of the drive with double-stick foam tape. Disconnect the SCSI cable from the back of the SCSI drive (s).
Take Apart
Hard Drive, Ultra2 LVD SCSI - 24 9 If you're returning the drive to Apple, remove the four screws from the hard drive carrier.
10 Lift the hard drive from the carrier.
Note: Return drives without cables or carriers. Exchange Apple hard drive modules in Apple packaging. Failure to comply with this requirement may result in a packaging noncompliance charge. Refer to the service parts database for more information.
Take Apart
Hard Drive, Ultra2 LVD SCSI - 25
1
Version 1 Carrier Replacement
2 3
Make sure any cables underneath the hard drive carrier are lying flat in place.
Install the drive carrier into the computer.
Align the carrier tabs on the front of the carrier with the chassis slots. Push down and forward on the carrier as you slide it into the slots until the pin locks into position.
Take Apart
Hard Drive, Ultra2 LVD SCSI - 26 4 Install the hard drive retainer and screw into place.
5
Connect all cables to the hard drive(s). P5 attaches to bay 1 P2 attaches to bay 2 P3 attaches to bay 3
Take Apart
Hard Drive, Ultra2 LVD SCSI - 27
Version 2
1 Disconnect the Ultra2 LVD SCSI data cable from the Ultra2 LVD SCSI card.
Take Apart
Hard Drive, Ultra2 LVD SCSI - 28 2 Disconnect the SCSI hard drive power cable (P5). Caution: Pull the SCSI power cable straight out of the connector on the drive. Any up or down motion to the connector could damage the drive. Replacement Note: The power cables attach to drives as follows: P5 attaches to bay 1 P2 attaches to bay 2 P3 attaches to bay 3
3
Disconnect the Ultra2 LVD SCSI data cable from the hard drive.
Take Apart
Hard Drive, Ultra2 LVD SCSI - 29 4 Remove the hard drive carrier mounting screw.
Take Apart
Hard Drive, Ultra2 LVD SCSI - 30 5 Pull the drive carrier back and lift up at an angle to release the carrier tabs from the slots in the chassis.
6
Remove the carrier and drive from the computer.
Take Apart
Hard Drive, Ultra2 LVD SCSI - 31 7 If you're returning the drive to Apple, remove the SCSI data cable and terminator (black plastic housing) from the top of the drive. The cable and terminator are attached to the drive with double-stick foam tape.
Take Apart
Hard Drive, Ultra2 LVD SCSI - 32 8 If you're returning the drive to Apple, remove the four screws from the hard drive carrier. Lift the hard drive from the carrier.
9
Note: Return drives without cables or carriers. Exchange Apple hard drive modules in Apple packaging. Failure to comply with this requirement may reslut in a packaging noncompliance charge. Refer to the service parts database for more information.
Take Apart
Hard Drive, Ultra2 LVD SCSI - 33 10 If you're replacing the thermal pad on the drive, remove the old pad and apply the new pad to the same area on the drive.
Important: Before installing a new 36 GB Ultra2 LVD SCSI IBM drive, you must apply a thermal pad in the area illustrated.
Take Apart
Carrier Support Plate - 34
Carrier Support Plate
Note: Perform this procedure only on units with a version 2 chassis and only if you must replace the support plate or the cables below the plate. Before you begin, do the following: · Open the side access panel · Remove the hard drive in drive bay 1
Take Apart 1
Carrier Support Plate - 35 Remove the two support plate mounting screws from the bottom of the unit.
Take Apart 2
Carrier Support Plate - 36 Lift the plate at an angle and remove it from the computer.
Take Apart
Video Card - 37
Video Card
Before you begin, do the following: · Open the side access panel · Remove the external video cable Note: The video card is always installed in the short PCI slot, slot 1. The slot numbers are stamped on the rear access I/O panel.
Take Apart 1 2
Video Card - 38 Remove the video card mounting screw.
Gently lift up on the video card to remove it from the PCI slot.
Take Apart
Ultra2 LVD SCSI Card - 39
Ultra2 LVD SCSI Card
Before you begin, open the side access panel.
Take Apart 1
Ultra2 LVD SCSI Card - 40 Remove the Ultra2 LVD SCSI card mounting screw.
2
Disconnect the Ultra2 LVD SCSI cable from the PCI card. Note: Make sure no other cable is attached (externally, or on the second internal connector if using the dual channel SCSI PCI card).
3
Gently lift up on the Ultra2 LVD SCSI card to remove it from the PCI slot.
Take Apart
FireWire Board - 41
FireWire Board
Before you begin, open the side access panel.
Take Apart 1
FireWire Board - 42 Remove the screw securing the FireWire board to the I/O panel.
2
3
Remove the screw that secures the FireWire board to the metal standoff.
4
Disconnect the FireWire cable, the short 3-pin cable from the back of the FireWire board or logic board. Gently lift up the FireWire board to remove it from the logic board connector.
Take Apart
Modem - 43
Modem
Before you begin, open the side access panel. Note: The modem is a buildto-order option or upgrade kit. If you're installing a modem upgrade kit, refer to the "Modem Installation" section in the Upgrades chapter. If you are removing or replacing a faulty modem, continue with these procedures.
Take Apart 1
Modem - 44 Remove the screw (located next to the modem port) that secures the modem to the I/O panel. Remove the screw that secures the modem leg standoff to the logic board.
2
Take Apart 3
Modem - 45 Carefully disconnect the flexible modem cable from the logic board. Important: The modem cable is very fragile. Gently lift up the modem, to remove it from the logic board.
4
Note: If the modem is being replaced, continue with the take apart procedures to remove the modem from the bottom modem shield.
Take Apart 5
Modem - 46 With a jeweler's screwdriver, pry the metal tabs up on the top shield.
6
Carefully disconnect the flexible modem cable from the modem board.
Take Apart 7
Modem - 47 Remove the screw securing the modem to the bottom shield.
Take Apart 8
Modem - 48 Note: There are two tiny metal tabs on the inside of the bottom shield. The modem rests on these tabs so the modem does not make contact with the bottom shield. With a needlenose pliers, pinch the tiny metal tabs flat so the modem board can be removed from the bottom shield.
Take Apart 9
Modem - 49 Carefully spread the sides of the bottom shield out just enough so the modem clears the tabs, and starts to fall out of the bottom shield.
10 Carefully remove the modem from the bottom shield.
Take Apart
Processor Module - 50
Processor Module
Before you begin, open the side access panel.
Take Apart 1
Processor Module - 51 Remove the screw that attaches the ground wire to the logic board. (Note: the processor and ground wire on your unit may be in a different location than shown in this graphic.)
Take Apart
Processor Module - 52
±Warning:
2
The heatsink may be hot to the touch.
3
While pressing down on the top of the heatsink clip, use a small flatblade screwdriver to lift up and out on the front tab of the clip to release the heatsink clip. Remove heatsink clip.
Take Apart 4
Processor Module - 53 Lift the heatsink off of the processor module.
Take Apart 5
Processor Module - 54 Lift the lever to release the processor module.
Take Apart 6
Processor Module - 55 Handle the processor by the edges and gently lift it straight up to remove. Be careful not to bend the pins underneath the module.
Important: If you are only replacing the processor module, stop here. If, however, you are removing the processor module in order to replace the logic board, continue on to the next page.
Take Apart 7
Processor Module - 56 Remove the warranty sticker and jumper block if replacing the logic board only.
Important: When replacing the processor module, you must change the processor jumper block and warranty sticker to be compatible with the processor module you are installing. Failure to install the jumper block properly will result in a unit that does not power on.
White jumper: 400 MHz Blue jumper: 350 MHz Black jumper: 300 MHz
Take Apart
Processor Module - 57 Replacement Note: Position the processor module evenly over the processor module slot and make sure the card is seated evenly. Press down gently on the processor module to install it. Never force the module into place or you may damage the gold connector pins on the underside. Rotate the lever down, flat against the logic board to lock the processor in place. Replace the heatsink on top of the processor module.
Take Apart
Processor Module - 58 Secure the heatsink by inserting the clip into the slot at the rear of the processor and then swinging the clip down over the heatsink. Press the clip into the front latch to fasten in place. Attach the ground wire to the logic board.
Take Apart
SDRAM DIMM - 59
SDRAM DIMM
Before you begin, open the side access panel.
Take Apart 1
SDRAM DIMM - 60 Push down on the connector clips to unlock the DIMM. Lift the memory module out of the slot.
2
Take Apart
CD-ROM/DVD-ROM/DVD-RAM/Zip Drive Bezel - 61
CD-ROM/DVDROM/DVD-RAM/ Zip Drive Bezel
Before you begin, open the side access panel.
Take Apart
CD-ROM/DVD-ROM/DVD-RAM/Zip Drive Bezel - 62 1 From inside of the chassis, behind the front panel, push the two bezel tabs forward to release the drive bezel from the front panel. Disconnect the bezel from the hinge on the front left side to remove the bezel from the computer.
2
Take Apart
CD-ROM, DVD-ROM, or DVD-RAM Drive - 63
CD-ROM, DVDROM, or DVDRAM Drive
Before you begin, do the following: · Open the side access panel · Remove the CD-ROM/ DVD-ROM/DVD-RAM/Zip drive bezel
Take Apart
CD-ROM, DVD-ROM, or DVD-RAM Drive - 64 1 Remove the two screws on the drive carrier. The drive carrier is removed from the computer as a unit. The drives are attached to the carrier.
Take Apart
CD-ROM, DVD-ROM, or DVD-RAM Drive - 65 2 From inside the chassis, push the drive carrier forward about one inch.
3
4
Disconnect the following cables from the back of the CD-ROM, DVD-ROM, or DVD-RAM drive: · Power cable (P7) · IDE data cable · Audio cable
Disconnect the following cables from the back of the Zip drive (if present): · Power cable (P6) · IDE data cable
Take Apart
CD-ROM, DVD-ROM, or DVD-RAM Drive - 66 5 Continue sliding the drive carrier out of the computer. Important: The drive carrier may be difficult to push forward due to the EMI gasket and tape located on the underside of the carrier (directly below the Zip drive). When the carrier is out of the computer, remove the EMI shield from the back of the CD-ROM, DVD-ROM, or DVD-RAM drive.
6
Take Apart
CD-ROM, DVD-ROM, or DVD-RAM Drive - 67 Note: Perform the following procedure if you are replacing the CD-ROM, DVD-ROM, DVD-RAM, or Zip drive. 7
8
Using a Phillips screwdriver, remove the four drive carrier mounting screws. Slide the drive(s) out of the carrier.
Replacement Note: The DVD-RAM drive is not as tall as the CD-ROM and DVD-ROM drives. Before screwing the DVD-RAM
Take Apart
CD-ROM, DVD-ROM, or DVD-RAM Drive - 68 drive back into the carrier, lift the back of the drive slightly so that the drive is flush against the carrier. Replacement Note: When inserting the drive carrier into the computer, make sure the carrier tab slides into the hole on the stationary drive shelf.
Take Apart
Zip Drive - 69
Zip Drive
If removing the Zip drive, follow the procedures for removing the CD-ROM or DVD-ROM Drive. Important: The Zip/CD-ROM drive carrier may be difficult to push forward after removing the screws on the bezel. The EMI gasket/tape located on the underside of the drive carrier, (directly below the ZIP drive), holds the carrier securely in place. Continue pushing forward until the carrier is released.
Take Apart
Fan - 70
Fan
Before you begin, open the side access panel.
Take Apart 1 2
Fan - 71 Remove the two screws on the fan bracket.
3
Pull the fan bracket down to access the power-to-fan connector. Disconnect the powerto-fan connector.
Take Apart 4
Fan - 72 Lift fan bracket out of the computer.
Replacement Note: The fan bracket has two holes (on the top) that join with two tabs on the chassis. If the tabs aren't inserted in the holes, the screws that secure the fan bracket to the chassis won't align properly.
Take Apart
Fan - 73 Perform the following procedure only if you are replacing the fan. 5
6
Using a Phillips screwdriver, remove the four screws securing the fan to the fan bracket. Lift the fan from the fan bracket.
Take Apart
Power Supply - 74
Power Supply
Before you begin, do the following: · Open the side access panel · Remove the CD/DVDROM/Zip bezel · Move the CD/DVD-ROM/ Zip drive carrier forward 1 inch
Take Apart 1
Power Supply - 75 Disconnect the following power cables: · Cables P6 and P7, going to the CD-ROM/ Zip drive · Cable P4 going to the front panel board · Main power cable going to the logic board · Cable(s) to other hard drives (if present)
Take Apart 2
Power Supply - 76 Using a 2.5 mm allen wrench, remove the three screws on the rear vented panel.
Take Apart 3
Power Supply - 77 On the inside of the chassis, remove the screw that attaches the power supply to the power supply shelf.
4
Slide the power supply forward, towards the front of the computer. Manuever the power supply (clearing the security bar on the inside and upper chassis) and its cables out of the chassis.
Take Apart
Power Supply - 78 Replacement Note: You must set the power supply voltage switch to the correct setting (115V in the U.S.) to avoid damaging the computer.
Take Apart
Handle, Top Front - 79
Handle, Top Front
No preliminary steps are required before you begin this procedure.
Take Apart 1
Handle, Top Front - 80 Using a 2.5 mm allen wrench, remove the two allen screws. Lift the handle from the computer.
2
Take Apart
Handle, Top Front - 81 Replacement Note: When installing the handles (top front and top rear) orient them so that the three tiny bumps on the handle are in the orientation shown in the photo. The handle won't fit if it's turned upsidedown. The top front and top rear handles are interchangebable.
Take Apart
Handle, Top Rear - 82
Handle, Top Rear
No preliminary steps are required before you begin this procedure.
Take Apart 1
Handle, Top Rear - 83 Using a 2.5 mm allen wrench, remove the two allen screws. Lift the handle from the computer. Replacement Note: See prededing replacement note for orientation of the handles under "Handle, Top Front."
2
Take Apart
Panel, Top - 84
Panel, Top
Before you begin, remove the following: · Top front handle · Top rear handle
Take Apart 1
Panel, Top - 85 Slide the top panel back, towards the power supply, to unhook the tabs. Lift the top panel from the chassis.
2
Take Apart
Panel, Front - 86
Panel, Front
Before you begin, remove the following: · Top front handle · Lower front support · Lower front panel · CD-ROM/DVD-ROM/Zip drive bezel
±Warning:
When the lower support is removed, the computer can be unstable.
Take Apart 1
Panel, Front - 87 Open the side access panel. Locate the front panel tabs.
Take Apart 2
Panel, Front - 88 Using a screwdriver, carefully push the tabs inward to release them from the chassis. Pull the front panel off the chassis.
3
Take Apart
Panel, Rear, Vented - 89
Panel, Rear, Vented
Before you begin, remove the following: · Top rear handle · Lower rear support
±Warning:
When the lower support is removed, the computer can be unstable.
Take Apart 1 2 3
Panel, Rear, Vented - 90 Open the side access panel.
Remove the three 2.5 mm allen screws.
Push in on the six tabs to release the panel from the chassis.
Take Apart 4
Panel, Rear, Vented - 91 Once the tabs are released, carefully pull the rear panel forward to remove.
Take Apart
Panel, Side, Right - 92
Panel, Side, Right
Before you begin, remove the following: · PCI cards (if present) · Video card · FireWire board (if present) · Modem (if present) · Main logic board · I/O panel · Latch panel
Take Apart 1
Panel, Side, Right - 93 Remove the four 2.5 mm allen screws on the side panel.
Take Apart 2 3
Panel, Side, Right - 94 Open the side access panel.
Remove the two Phillips screws attaching the side chassis frame to the panel latch.
Take Apart 4
Panel, Side, Right - 95 Using a flatblade screwdriver or needlenose pliers, push or squeeze the plastic tabs (protruding through the side chassis panel), to release the right panel from the metal chassis. Remove the right side panel off the chassis.
5
Take Apart
Panel, Side, Left - 96
Panel, Side, Left
No preliminary steps are required before you begin this procedure.
Take Apart 1
Panel, Side, Left - 97 Remove the four 2.5 mm allen screws on the side panel.
Take Apart 2 3
Panel, Side, Left - 98 Open the side access panel.
Remove the fan screws and drop the fan bracket down to access the plastic panel tabs (protruding through the side chassis) on the left side panel.
Take Apart 4
Panel, Side, Left - 99 Using a needlenose pliers, squeeze the tabs (located behind the fan bracket) to release the left side panel from the metal chassis. Lift the left side panel off the chassis.
5
Take Apart
Panel, Latch - 100
Panel, Latch
Before you begin, open the side access panel and remove the following: · PCI cards (if present) · Video card · FireWire board (if present) · Modem (if present) · Logic board · I/O panel
Take Apart 1
Panel, Latch - 101 Remove the four Phillips screws holding the panel to the chassis. Note: Yellow arrows indicate tab locations.
2
3
Slide the panel toward the hard drives, freeing the latch panel from the tabs on the chassis. Remove the latch panel.
Take Apart
Panels, Lower Front and Lower Rear - 102
Panels, Lower Front and Lower Rear
Before you begin, do the following: · Place the computer on its side · Remove the front and/or rear support
±Warning:
When the lower support is removed, the computer can be unstable.
Take Apart
Panels, Lower Front and Lower Rear - 103 Note: The computer is shown upsidedown. 1
Lift the lower front panel or the lower rear panel from the chassis. There are no screws holding these panels to the chassis. The front and rear supports (legs) hold them in place.
Important: These panels are keyed. The notch goes on the access panel side.
Take Apart
Supports, Front and Rear - 104
Supports, Front and Rear
Before you begin, place the computer on an ESD mat and turn the unit upsidedown.
±Warning:
When the lower supports are removed, the computer can be unstable.
Take Apart
Supports, Front and Rear - 105 1 Using a 2.5 mm allen wrench, remove the four allen screws, two screws for each support.
Take Apart
Supports, Front and Rear - 106 2 Lift the support off the computer.
Take Apart
Panel, I/O Cover - 107
Panel, I/O Cover
Before you begin, do the following: · Open the side access panel · Remove the main logic board
Take Apart 1 2
Panel, I/O Cover - 108 Remove the two screws on the I/O panel.
Push the I/O panel inward to remove it from the chassis frame.
Take Apart
Panel, I/O Cover - 109 Note: The I/O cover is difficult to remove, take your time prying the plastic tabs. 3
Using a jeweler's screwdriver, working from right to left, carefully pry the plastic tabs away from the metal frame. As each tab is released, pull the I/O cover away from the frame.
Take Apart
Speaker - 110
Speaker
Before you begin, do the following: · Open the side access panel · Remove the hard drive carrier · Disconnect the main power cable from the logic board
Take Apart 1 2
Speaker - 111 Open the cable clamps.
3
Disconnect the speaker cable from the main logic board at J34. Free the cable from the cable clamps and the fan bracket.
Take Apart 4
Speaker - 112 Push the speaker tab in and pull the speaker housing back to release. . Remove the speaker housing from the computer.
5
6
Remove the speaker from the speaker housing. Note: The speaker and speaker housing are separate parts.
Take Apart
Front Panel Board - 113
Front Panel Board
Before you begin, do the following: · Open the side access panel · Remove the hard drive carrier to access the front panel cable · Disconnect the main power cable from the logic board
Take Apart 1
Front Panel Board - 114 Disconnect the front panel cable, J2 cable (FireWire), and open the cable clamps.
Take Apart 2
Front Panel Board - 115 Using a screwdriver, press tabs in on the front panel shield. Pull the front panel shield away from the chassis.
3
4
Disconnect the three cables attaching to the front panel board. Replacement Note: Power cable P4 connects to the front panel board.
Take Apart 5
Front Panel Board - 116 IPush in and pry up on the three tiny metal tabs to release the front panel board from the front panel shield.
Take Apart
I/O Panel - 117
I/O Panel
Before you begin, do the following: · Open the side access panel · Remove the main logic board
Take Apart 1
I/O Panel - 118 Remove the two screws on the I/O panel.
Take Apart 2
I/O Panel - 119 Tilt the I/O panel forward and remove.
K Service Source
Troubleshooting
Power Macintosh G3 (Blue and White) /Macintosh Server G3
Troubleshooting
General - 1
General
The Symptom Charts included in this chapter will help you diagnose specific symptoms related to the Power Macintosh G3 (Blue and White) and Macintosh Server G3 product. Because cures are listed on the charts in the order of most likely solution, try the cures in the order presented. Verify whether or not the product continues to exhibit the symptom. If the symptom persists, try the next cure. (Note: If you have replaced a module, reinstall the original module before you proceed to the next cure.) For additional assistance, contact Apple Technical Support.
Troubleshooting
Architecture of the Main Logic Board - 2
Architecture of the Main Logic Board
The architecture of the main logic board is based on the PowerPC G3 microprocessor and three buses: the processor bus and two PCI buses, a primary 32-bit 66 MHz bus and a secondary 64-bit 33 MHz bus. The processor bus connects the microprocessor, cache, and main memory; the primary PCI bus is for an Apple graphics card solution; the secondary PCI bus connects the I/O devices. The I/O devices on the secondary PCI bus are: · Ultra DMA/33 (ATA-4) disk interface · USB interface · FireWire interface
· Paddington I/O controller IC
· PCI 33.33 MHz 64-bit slots #2, #3, and #4 · DEC/Intel 21154 PCI-PCI bridge IC
Troubleshooting
Block Diagram - 3
Block Diagram
The following illustration provides an overview of the Power Macintosh G3 / Macintosh Server G3 internal components and shows how they are connected.
Troubleshooting
Logic Board Diagram - 4
Logic Board Diagram
Monitor Card Slot PCI Slots J1 IDE J15 Ultra2 ATA J23 Power S5 Power Button S4 Cuda Button Battery J8 CD Audio J31 Processor J34 J25 Front Panel Plug-In Speaker Jumper Block Board Slot (w/sticker) J2 Firewire Power SDRAM DIMM Slots
VOID Warrenty Seal if Broken
Sound In & Sound Out Ports
USB Ports A&B
Ethernet Connector ADB Firewire Ports (2)
Modem Connector
Troubleshooting
Processor Module - 5
Processor Module
The logic board comes with a removable processor module. You can replace this module when the logic board or processor module fails. The processor module sits in a ZIF socket for easy removal. Processor modules can be ordered from Service, and each is shipped with the appropriate jumper configuration block to place in location J25. The processor should rarely fail. Replace it only as a last resort. When replacing the processor module, you must change the processor jumper block and warranty sticker to be compatible with the processor module you are installing. Failure to install the jumper block properly will result in a unit that does not boot up. Refer to "Jumper 25 Orientation" on the following pages for installation instructions.
Troubleshooting
Jumper Location J25 - 6
Jumper Location J25
The jumper block you place at location J25 configures the board to work with different processor modules. Use the appropriate jumper block, identified by color, for each processor module. Refer to "Processor Module" in Take-Apart for instructions. Processor Speed 300 350 400 Jumper Color Black Blue
White
The jumper block is protected by a void-warranty sticker. End users are not allowed to remove this jumper block. If the sticker has been tampered with on a unit you receive for repair, do not honor the service warranty on the system.
Troubleshooting
Jumper Location J25 7
Jumper J25 Orientation
Jumper orientation is important. If the processor jumper is not in the correct position, the computer will not startup properly. Make sure the bump (shown above) on the jumper is towards the top of the logic board and across from pin #1.
Troubleshooting
PCI Expansion Slots - 8
PCI Expansion Slots
The logic board uses the industry-standard peripheral component interconnect (PCI) bus for an I/O expansion bus. The Power Macintosh G3 has a primary 66 MHz bus and a secondary 33 MHz PCI bus. The 66 MHz bus is a 32-bit multiplexed address and data bus. The 33 MHz bus is a 64-bit multiplexed address and data bus. The primary PCI bus, includes slot #1, (see graphic below) which accommodates only 32-bit 66 MHz +3.3V PCI cards. However, the Power Macintosh G3 computer is always configured with an Apple 2D/3D accelerated graphics card installed in slot #1, therefore it is not available for PCI card expansion unless the card is removed. The secondary PCI bus includes slots #2, #3, and #4, (see graphic below) which accommodate both 32-bit and 64-bit 33 MHz +5V or 3.3V PCI cards. The logic board accepts standard 6.88-inch and 12.283-inch PCI cards as defined by the PCI Local Bus Specification, Revision 2.1. PCI cards are required to use the standard ISA fence described in the specification. The PCI slots support all the required PCI signals and certain optional PCI signals. The three 33 MHz PCI slots on the logic board support the optional 64-bit bus extension signals and cache support si