Apple powermac g3 blue.white Service Manual
Troubleshooting
General/Processor and Jumper Block - 13
Processor and Jumper Block
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.
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.
Yellow jumper: 450 MHz
White jumper: 400 MHz
Blue jumper: 350 MHz
Black jumper: 300 MHz
White jumper: 400 MHz
Blue jumper: 350 MHz
Black jumper: 300 MHz
Note that when you replace the logic board on a Power Macintosh
G3 (Blue and White), you must also change the processor jumper
block and warranty sticker to be compatible with the processor