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                  K Service Source




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
             K Service Source




                 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/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 (yellow jumper for 450 MHz, white jumper
             for 400 MHz, blue jumper for 350 MHz, and black jumper
             for 300 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. Apple-authorized 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) computers described in this manual. The SDRAM
             DIMM modules for these computers must be PC-100
             compliant,168-pin, 3.3-volt, unbuffered, and rated at 125
             MHz (8 ns) or faster.
Hot Issues                                             SDRAM DIMMS - 5

             Characteristics of the memory to be used in Power Macintosh
             G3/Macintosh Server G3 (Blue and White) are:
             

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