20 Sep
2008
20 Sep
'08
10:47 p.m.
dwight elvey wrote:
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