[rescue] Any 3/110 owners out there

[Kurt Nowak]

Hey Scott,
Thanks for checking this for me and confirming. It's unlikely that a cap
will short unless it's a safely cap - especially an electrolytic - More
likely will go open. But I'll check the others. Probably a bad chip
somewhere that's being pulled low. Maybe a tantalum is more likely to
short? Then there are the three video chips which may have a fault. I would
need to buy a tool to pull them without damaging them. I'll also have a
look at my 3/160 board and see if I can find some visual similarities. At
least there is a schematic available for it which may give me some clues.
The 3/60 also has a schematic available but its too dissimilar to the 3/110.

-Kurt
-Kurt

On Sun, Jan 26, 2025, 13:01 Scott Quinn via rescue <rescue at sunhelp.org>
wrote:

>
> Kurt wrote:
> About a year ago I lost video output on my 3/110 and I'm back to trying to
> find the fault. Not so easy on a VME bus machine. Yesterday I noticed a
> short across the large 470 ufd electrolytic capacitor near the battery of
> the CPU board (270-1134-03). I desoldered the cap and it tested fine and
> noticed that the short is across the vias of the cap. Since a schematic of
> this machine is pretty much unobtainable I was wondering if another 3/110
> owner out there would be kind enough to test the continuity across this
> cap. Thanks.
>
> -Kurt
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> I pulled the board out of my /110 and also grabbed the spare that has one
> of the video channels go out after a bit, on both of them the ohmmeter
> reads open circuit across that cap lead :(. On the plus side it might not
> be the board itself, as that capacitor is probably across the power planes,
> but there are a lot of other capacitors and stuff that you will need to
> rule out.
>
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