The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
awemawson:
So at last the rear of the Controller is revealed, but so is a lot more corrosion, and absolutely no sign of the back up battery :scratch:
I'm sure the horrors MUST have been caused by a leaking battery, but I cannot at the moment see it, OR it's holder - very strange.
But that's enough for today - I'm wacked
vtsteam:
Nothing by halves, Andrew! The brown juice, not so nice. :( I'm sure you'll have this thing spinning, though. :dremel:
awemawson:
Progress report:
This mornings objective - get the controller out of the machine and find where the battery is / was.
I went round arbitrarily labelling cables and their associated sockets so that I stand some chance of getting it back as it was , then it was a case of unscrewing socket retainers pulling cables off and withdrawing the controller. Some of the badly corroded fixings on cable shell sheared off not surprisingly.
(many of these pictures are for record purposes so perhaps a bit boring - sorry :scratch:)
awemawson:
So with the controller on the bench I attempted to remove all the cards from the card cage - again in places the corrosion defeated screwdrivers and some screws had to be drilled out.
But finally all cards were removed from the card cage - quite a bit of electronics here :bugeye:
awemawson:
Now Card-B would appear to be the root cause of all this corrosion.
It holds a plug in sub-module with the culprit battery backing up four 32k x 8 bit static rams. The battery has swollen, presumably burst, and dribbled it's contents down this card. Also on this card is the interface to the Probe, the MPG module and the I/O module
It is possible that this card and sub-module are recoverable, but it would be highly desirable to replace them . Apart from the 48 pin big i/c which I assume to be a custom LSI, all the other i/c's are standard LSTTL from the 7400 range
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