Hi, I may be able to help (no promises!)... I don't know the TC-D5M, but I know a bit about servo control loops and can understand (most of) the...
Right, I now have my F707 open on the bench. I'm powering it from a bench power supply which displays the load current, and I have discovered a...
Key point in valentin's post above: Electrolytic caps always have a polarity identification stripe on the negative terminal; Tantalum caps...
This was my restoration project over the Christmas break. I was hesitant to even attempt this one, considering the state of the capstans and...
I'd already reassembled the DDC before my last post, sorry. Considering that you have at least some activity on the output rails I'd suggest it's...
Having said that... I thought I'd try dissecting the transformer to find out how it's failed. There is an outer sleeve (made of ferrite I think),...
@Fulltimehuman, DDC_CTL drives the base of Q801 through a current-limiting resistor R801, switching the Battery+ supply to part of the DDC...
@Fulltimehuman, thanks, yes your thread was one of the ones I'd seen when searching for info about this problem. I hoped you'd found the solution...
Thanks. No, I hadn't seen that, but nothing in there that would explain the complete lack of response from all three of these units. They don't...
I've recently picked up one of each of the above models. They are in generally good cosmetic condition, but all three are non-starters. No power,...
Hello all, I've been on the forum before in the distant past (username "picotera"), before the "old" forum platform closed in 2016. I'm a...
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