----- Original Message ----
> From: Nicolas Bradley <[email protected]>
> To: Vintage Macs <[email protected]>
> Sent: Tue, January 26, 2010 9:31:40 AM
> Subject: Apple IIFX Not Powering Up
>
> I recently attained the guts of a Mac IIfx (no case I'm afraid) from a
> friend and I've been having trouble getting it powered on.Due to my
> lack of a suitable case I've got the components laid on a table, with
> the logic board and power unit connected and both screw sockets
> grounded to the PSU (as from experience with getting power macs going
> they must be grounded for it to power up). When I try both hard switch
> (on the logic board) and soft boot (keyboard) buttons I don't get
> anything at all, not even a peep from the power supply. I'm assuming
> it's an issue with flat PRAM batteries, as I've read that the IIfx
> can't power on without batteries, and the machine hasn't been started
> properly since the end of the last millennium, but I'm just wondering
> if there are any other terrible defects (dead capacitors ect..) that
> may contribute to causing this issue.
Can you check the voltage of the batteries with a multi-meter to determine if
they still have somewhere near 3.6v each or are dead?
I remember starting up my IIfx with some old weak PRAM batteries a few months
ago but it was assembled in a Mac II case, so don't know about a caseless one.
And I did not check the voltage on the batteries at that time but it did boot
OK.
Leaking capacitors are a real concern, look closely for an dark residue near
them. I'm afraid some of my vintage Mac's will soon need cap replacements. I
had an IIsi die from that ailment.
Good luck with your IIfx project --glen
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