23 Sep
2008
23 Sep
'08
12:56 a.m.
----- Original Message -----
From: "Josh Dersch" <derschjo at msu.edu>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Sunday, September 21, 2008 1:47 AM
Subject: Re: Otrona Attache power supply woes...
dwight elvey wrote:
Josh - how about I send you a power supply, and if it works, we'll discuss
price - I'd rather you try it first...
I have (2) dead Attache's, stripped apart. Can't get 'em to do anything. 2
different rev motherboards, as well.
Power supplies both light up, and they do have voltages present at the pins,
as I went through that with the
tech manual/schematics early in the year, but gave up. Too many machines,
not enough time, not enough focus :)
Let me know if it piques your interest. If i can't get either of mine going,
I'd rather it assist in someone else getting
theirs going... PSU SHOULD fit into a USPS priority mail flat-rate box, but
I'd have to get it off the shelf to actually look.
Tony
Hi Josh
Can you take some more voltage readings.
It would be good to see Pin 4 and Pin 9 of U4. In fact, it would
be good to see a repeat of all the pins of U4 again.
Can you also take readings of the pins on U5 as well.
This will help quite a bit on trying to understand what
is causing the failure.
Dwight
Sure.
U4:
1 - 0V
2 - 2.40V
3 - 0V
4 - 0V
5 - oscillating
8 - 7.91V
9 - 4.43V
10 - 2.5V
11 - 6.70V
12 - 7.92V
13 - 5.03V
14 - 5.0V
15 - 5.0V
U5:
1 - 6.31V
2 - 0V
3 - 2.15V
4 - 7.92V
5 - 5.05V
6 - 0V
7 - 6.61V
8 - 0V
9 - 0V
10 - 0V
12 - 0V
13 - 0V
14 - 0V
Actually, these values look better than they did before, I guess I was
mistaken in my earlier response. I'm still getting nothing at the power
supply outputs, however. Any ideas?
Thanks,
Josh