7300 - no boot — #3

Post #3 by Gil

Source Forum	68kMLA
Category	Hardware
Post Date	Wed, 23 Sep 2009 - 22:08
Original URL	https://68kmla.org/bb/threads/7300-no-boot.18645/

Post

Which CPU card do you have plugged in.
And yes, the ROM is soldered down.

Hmmm. If you have a voltmeter, I would measure the 3.3V wires from the power supply (you can plug the probe into the back of the connector housing next to the wires). I think that without 3.3V you'll get a chime but no boot/video because one or two components of the PCI bus (the clock buffer which distributes the 33.333 MHz clock) require 3.3V in order to operate properly. I could be wrong about that. It's been such a long time since I did those experiments.

Jeff Walther

The processor is a Sonnet Crescendo G3, 300 MHz.

There are 2 power connectors that plug into the logic board, and I'm not too good with that kind of stuff, so you'd have to be more specific as to which of the two connectors, and which slot in the connector(s) to test.