Apple powermac server g3 minitow Servicehandbuch

 

 Troubleshooting

New Components Theory of Operation/Jumper Location J28 - 5

 

Jumper location J28 controls which power supply the logic board 

can accommodate. When you receive a Power Macintosh G3/Mac-

intosh Server G3 logic board from Service, you need to place the 

jumper in the proper location. The power supply used in the 

Power Macintosh G3 Desktop computer is different from the 

power supply used in the Power Macintosh G3 Minitower and 

Macintosh Server G3 computers.

If the logic board is installed in the Minitower/Server chassis, 

the power supply jumper must cover the pins marked “PS”. If 

the logic board is installed in the Desktop chassis, this jumper 

must cover the pins marked “Mac”. (Replacement logic boards 

should come preset for the Desktop model.) When replacing the 

logic board, be sure to check the power supply jumper setting. If 

this jumper is missing or set incorrectly for the computer model, 

the computer will not boot up