Mystery TE time, just pulled this board after noticing an expired tant , my web search has drawn a blank on the BBC Metrawatt V-Modul block and the Datel AM 490-2C IC.
Some electrolytic capacitors on another board are past it too.
Edit: why does search work better after I post? The Datel is apparently a chopper stabilized op-amp.
David
Whether it helps or not idk, but in this case BBC will not be British Broadcasting Corporation, and instead will be Brown, Boveri & Cie, now ASEA Brown Boveri (ABB)...
After working on train electrics/electronics for many years, I'm very familiar with both BBC & ABB, some of the units were made in the years after the merger are a mix of both brands.
But in this case the web is suggesting the
BBC/ABB Metrawatt brand ended up with Gossen.
David
Somewhere should be a collection of merger treeviews.
Think I've got it fixed, multiple shorted tantalums across power rails again.
The board seems to be for a 0 to 3000.00mV function, of the mystery device, I'm wondering if it's used in something else, as there are parts that were removed for use in this device.
I didn't have a 1.5uF tant beads in stock, a 0.47 & 1uF went in, the yellow STC 1uF promptly went tits up.
It got cut out of circuit, +/- 15V rails were now working, but not for long, another blue tant expired quickly (without smoke), I'm thinking 35V tants across the unregulated 25V rails are maybe too low.
At this point I got fed up with the tants and fitted some 4.7uF 50V electrolytics in place of the lot, much better.
While I was in there I checked the rest of the capacitors and replaced a few tired ones on the other board, this board is part of the remote control for the 300V output.
David