User's Manual

Take Apart Logic Board - 86
Desktop model, this jumper must cover the pins marked
“Mac”. Failure to install this jumper correctly will result
in a computer that will not boot up.
Note: Replacement logic boards come with the J28 jumper
pre-installed in the PM G3 Desktop configuration; that is,
the jumper comes installed on the “Mac” pins. If you are
installing the logic board in a Power Mac G3 Minitower or
Server G3 unit, you must move the J28 jumper to cover the
“PS” pins. When replacing the logic board, be sure to check
the power supply jumper setting.
IMPORTANT: If you are replacing the logic board, you must
transfer the processor module and processor jumper (at
J16) from the original logic board to the replacement board.
See the take-apart instructions for the “Processor Module”
for more information. You must also cover the processor
jumper with a new warranty sticker, which comes with the