开云体育

Evening all.

An update... and happy to say, with progress!

Before heading out this morning, I had a quick probe around on the A2 vertical board and found two tantalums which measured short to ground on both sides but didn't have the time to look further. I suppose because the original problem occurred after I shorted two pins on the A6 interface board, I had almost only looked on that board and the A10 which connects directly to it. That said, it had becaome clear that I needed to expand my search.

Following Rogers suggestion to disconnect the jumpers and take measurements, there was progress made and the 5v rail stopped being a dead short.
It is still only up at 15Ω, however that is great news to me! There is no longer a dead short on any of the low voltage rails :)

It does seem that the reference voltage is in need of resolving before reconnecting the rails, but I 'm not sure how much I'll get done today as it has been a long one, with only an hour or so free to work on the scope.

Tomorrow is another day, and as Harvey suggested, I should have a read through the reference voltage section before continuing.

@ David

I am sure it would be worth checking with a scope however this is the only one I have, hence the determination to get it fixed. But thank you.

@ Mark

Replacing the filter caps is not really an option, as I am in Brazil.
The unit had been working fine. It was only my 'fixing what wasn't broken' which spannered things.
As for the recommendations regarding upgrading certain components I shall look into that and follow up when the unit is out of intensive care.
The MC1458's are both fine.


I am truly grateful to everyone here who has given their time and thought into saving this wonderful old Tek scope.

Tomorrow the reference voltage needs attention but if anyone has any more suggestions as to the next steps then I am all ears.

Good night gents.

It is late here.


James