Thanks a lot, but as described in my last post, I finally found the
location of the missing battery. I repast the text here:
Yes ! I found it !
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http://zeltrax.com/classiccmp_forum/06.jpg
You are right, there was indeed a beginning of corrosion with a leaking
battery. I had taken it away, I could not remember it at all.
I still have to find the voltage of this missing battery, do you know
it? Otherwise I have this UTS20D, there may also be a battery with the
same value ...
So I cleaned the rest of the acid, no damage I think.
http://zeltrax.com/classiccmp_forum/05.jpg
So it would only be the cause of the blank screen? That would be so
great !! :-)
I also disassembled the PSU board, some inflated capacitors, I'm going
to replace all these caps. There is also a broken/burned "molex" connector.
I will repair all this and I will post a topic dedicated to the
restoration of this machine.
Thank you all for the information !
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Unfortunately, in the meantime I replaced a series of capacitors at the
end of life, repaired the broken / burned Molex, built a replica of this
battery and it does not change anything, I always have a blank screen.
I still suspect food, something else that seems strange to me is the
absence of sound of static electricity when I turn on or off the
monitor, the filaments of the CRT collar nevertheless.
Difficult without schematics
On 30/07/2017 22:26, jim stephens via cctalk wrote:
On 7/30/2017 4:43 AM, Dominique Carlier via cctalk wrote:
Can you tell me where the batteries are supposed to be, on which board?
I disassembled the machine, extracted the 4 motherboards, I did not
see any batteries anywhere.
If they are externalized, maybe I removed them a long time ago in the
idea of replacing them, but I have not yet found where they were
connected in that case.
I don't know there are batteries, but the device had a lot of
configurations which were retained by some means. 1999 was a bit
early for eeproms that didn't have battery backup of some sort.
If there are no batteries visible, or large super caps which can back
up memory content, that is a good thing.
There may also be Dallas modules in the thing or similar which
integrate batteries. The components will usually have had a 5 to 10
year lifespan, and probably won't work so well across power cycles.
thanks
Jim
On 28/07/2017 11:25, jim stephens via cctalk wrote:
I do hope you get it going. If you feel qualified, one thing I'd
also look for are packs with batteries to hold information that may
have decayed. That sometimes can cause what you described. since
the system may have been left since 1999, the batteries may have
gone onto corrosion and you may have a bit of fixing to do for that.
