From: a...@p850ug1.demon.co.uk
Was the failed IC marked '723' or some house number?
-tony Hi Tony As I recall, it was marked LAS723-2.5Luckily, before I simply
replaced it, I checked the feedbackresistor values. They didn't make sense
for 7V.My guess is that it made using the 723 for
From: space...@gmail.com
On Sat, Aug 1, 2015 at 5:52 PM, dwight dkel...@hotmail.com wrote:
There we two different reference voltages on 723s. I don't recall which
was which but one had to change the feedback resistors if you used the
wrong one.
There's a reference with a built-in
Well, I had to look it up. The LAS723 comes with a 2.5V reference
and not a 7V.
Dwight
I've never found a 723 datasheet that gives a different values for
either reference.
Nor have I
The one I had to replace on my Nicolet oscilloscope was made by
Lambda. I don't recall the reference voltage but I did have to change
the feedback resistors to get it to work.
I seem to
Sounds just like the supply on my Altos. What a pain.
Eric Smith space...@gmail.com wrote:
I previously wrote about the monitor of my Intel Series II MDS going
out, which was because the +15V DC supply tripped the crowbar. The
voltage adjust was all the way to the minimum, and the voltage was
On Sun, Aug 2, 2015 at 10:56 PM, dwight dkel...@hotmail.com wrote:
Well, I had to look it up. The LAS723 comes with a 2.5V reference
and not a 7V.
Cool! Thanks for the warning about it. Fortunately the Power-One
supply I'm dealing with only uses normal 723s, but I'll have to bear
that in mind
On Sat, Aug 1, 2015 at 2:36 PM, Brent Hilpert hilp...@cs.ubc.ca wrote:
Just a suggestion: you're sure there no ground reference problem on pin 7
(V-) of the 723? (hence raising the Vref).
I've seen small 723-based supplies with sense leads where the 723 V- is on
the neg. sense lead rather
There we two different reference voltages on 723s. I don't recall which
was which but one had to change the feedback resistors if you used the
wrong one.
If seems there is only one ref voltage available today.
I think Jameco carries them. What package do you need. They
cam in cans and dips.
The root cause of the failure appears to be that the internal voltage
reference of the uA723, which is specified as 7.15V ±0.35V, is now
9.4V. The uA723 needs to be replaced. The uA723 is still readily
That's an unsual failure. I've had 723s go internally short-circuit and
then the output
On Sat, Aug 1, 2015 at 5:52 PM, dwight dkel...@hotmail.com wrote:
There we two different reference voltages on 723s. I don't recall which
was which but one had to change the feedback resistors if you used the
wrong one.
There's a reference with a built-in current source and amplifier,
which
On Sat, Aug 1, 2015 at 2:14 PM, tony duell a...@p850ug1.demon.co.uk wrote:
The root cause of the failure appears to be that the internal voltage
reference of the uA723, which is specified as 7.15V ±0.35V, is now
9.4V. The uA723 needs to be replaced. The uA723 is still readily
That's an unsual
A few weeks ago, while I was testing a spare IPB-80 CPU card in an
Intel Series II MDS, the monitor stopped working, with the raster
collapsing to a very bright dot in the center of the screen. I hit the
power switch and pulled the line plug immediately, but the dot
persisted for several minutes,
Al wrote:
does it have a horizontal oscillator?
some ball monitors require horizonal drive before the hv works
It doesn't appear to have a horizontal oscillator.
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