Mac IIfx update - test-drb@ccmp.vtda.org

26 Apr 2004

...
 No jerk, but I've already swapped the PSU with one
from another Mac II and
got similar results, though I guess it's entirely possible that one's toast
as well. Nothing obviously physically wrong with the PSU though, no bulging
caps etc. Was there a common cause of death for them? 
It would seem odd that two supplies would be dead.

Another thought. Is the ROM simm installed? The IIfx requires it. IIRC, 
when I had someone pull the ROM simm from a IIsi, the machine failed to 
power on without the simm installed. So maybe the ROM simm is missing. 

Also, if the simm is in place, there may be a jumper to tell the Mac to 
look for the simm. Look for a jumper marked W1. If it is on, the Mac will 
NOT look for a simm, if it is off, the mac WILL look for a simm. The IIfx 
requires a ROM simm, so the jumper should be off and the simm installed. 
(the jumper info is as per the macfaq.org web site, I've no personal 
experience with the jumper issue, and I don't know if the person that 
tested the IIsi for me knew about the jumper or not).

...
 That's helpful of them :) 
Its a 2.7 MB PDF, I'd be happy to send it over to you so you can see for 
yourself just how UN-helpful the thing is (some of the tech manuals are 
great, others leave much to be desired) :-)

-chris
<http://www.mythtech.net>