Hi Radu,
I think the PSU in all 545xx series was made by Boschert Inc. and
someone already reverse engineered it. I attached the file.
I hope it helps.
Regards,
Razvan
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On 02/03/2025 23:33, Radu Bogdan Dicher via groups.io wrote:
Going back to my -12V rail issue, the SM advises loading the 5.20V rail
with a 2ohm/25W resistor. The only way I can put something similar
together with what I have at hand is using these dummy loads I am using
when repairing audio amplifiers, which are a pair of 8ohm/100W non-
inductive resistors. By paralleling?them I can load the 5.20V rail with
a 4ohm resistor.
What are some thoughts regarding whether this would be a suitable load
for the PS? I think the PS just needs a low ohmic load of sufficient
dissipation capacity and it should crank itself up to nominal, but maybe
there's an aspect I'm overlooking.
Thank you,
Radu.
On Sun, Mar 2, 2025 at 1:52?PM Radu Bogdan Dicher via groups.io <
groups.io> <vondicher@... <mailto:[email protected]>>
wrote:
One of the two scopes is completely disassembled - head exploding
emoji - and I have the old battery desoldered after confirming?it's
fully depleted.
I enclose pics with what I'm using for replacement. I probably would
have been fine going with a 2032 type, but the 2430 I ended?up
fitting just right (maybe a bit snug), and the pins of the holder
actually match the PCB eyelets. So all is good.
I couldn't figure out what exactly was the original battery model,
as it's not legible even after removing the top tab, but its
diameter is a bit over 23mm.
I think this should work OK.
Back to the?actual troubleshooting now!
Radu.
On Fri, Feb 28, 2025 at 6:21?PM Roy J. Tellason, Sr. via groups.io
<> <roy@...
<mailto:[email protected]>> wrote:
On Thursday 27 February 2025 04:09:31 pm Radu Bogdan Dicher via
groups.io <> wrote:
> One other unfortunate effect of the spot-welding of the top
tab is that the
> battery code is not visible. I can probably destroy the
battery once out,
> and read the CRxyzt battery code, but would anyone have good
info offhand
> on it?
You might find bits of this useful:
<
en.wikipedia.org/wiki/List_of_battery_sizes>
Scroll down to where they discuss coin and button cells:
"IEC designation numbers indicate the physical dimensions of the
cylindrical cell. Cells less than one centimeter in height are
assigned four-digit numbers, where the first two digits are the
diameter in millimeters, while the last two digits are the
height in tenths of millimeters. Taller cells are assigned five-
digit numbers, where the first two digits are the diameter in
millimeters, followed by the last three digits indicating the
height in tenths of millimeters."
So the size of the battery will give you the info that you need.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet
Masters"
-
Information is more dangerous than cannon to a society ruled by
lies. --James
M Dakin
