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Troubleshooting Symptom Charts/Miscellaneous - 25
Identifying Logic Boards
As a general rule, if the Power Macintosh 7200/90 computer has
a serial number of xx545xxxxxx or higher, then the computer
should have the revised logic board already installed. If the
computer has a serial number of xx544xxxxxx, xx543xxxxxx or
below, verify that the board is revised as follows:
Look at location G1; G1 is located next to the internal 50-pin SCSI
connector and the CURIO ASIC.
• If a 20 MHz oscillator is present at location G1, the logic
board has been revised.
• If a 20 MHz oscillator is not present (four blank solder
pads) then the board has not been revised and should be
replaced under warranty.