23 Jan
2018
23 Jan
'18
7:58 a.m.
Hi All,
I got a lovely Televideo 970 terminal from another list-member over the
weekend. Aside from some PSU capacitor issues, it needs a little TLC:
1) The EMI filter had gone open-circuit - it's one of those metal can types
which is integrated with the IEC power input connector. Are these still
obtainable anywhere? It seems like equipment these days just has the
filtering directly on the PSU board, rather than as a separate module. I've
just bypassed it for testing, but I don't want to leave it like that.
2) I have a faulty back-tab, left shift and return key (return's simply
unresponsive, while the other two stick down). Do the keycaps on these
terminals simply pull off, or is there some trick to removal? I did some
experimental prying, but didn't want to try too hard and risk snapping the
switch stem.
I don't know if switches are still available, but worst-case I can swap the
faulty ones with ones for some of the 'special' keys that I'm extremely
unlikely to ever use.
cheers
Jules
23 Jan
23 Jan
10:54 a.m.
1) The EMI filter had gone open-circuit - it's one
of those metal can types
which is integrated with the IEC power input connector. Are these still
obtainable anywhere? It seems like equipment these days just has the
filtering directly on the PSU board, rather than as a separate module. I've
just bypassed it for testing, but I don't want to leave it like that.
You can still get these. The hard part is finding one which will fit
properly unless you are willing to bodge it together a bit. Just search
for "C14 EMI" on eBay and you'll find hundreds of them. Maybe you've
seen them already and were just surprised by how small they have become :)
You can also just remove it, and (safely) wire in a fixed power cord.
Aaron.
1:40 p.m.
On 01/23/2018 09:54 AM, Aaron Jackson wrote:
Ha, no... I'd actually not looked into it, I just assumed they were
long-gone because I'd not seen one used in anything for *years*.
The one in the Televideo is surprisingly compact, given the age - around 1"
wide, 3/4" high and 2" deep (including the solder points). It looks like I
should be able to find a replacement easily enough, though (I'm assuming
that the internal component values aren't particularly critical, and it's
just a case of finding something with enough max current rating)
1) The EMI filter had gone open-circuit -
it's one of those metal can types
which is integrated with the IEC power input connector. Are these still
obtainable anywhere? It seems like equipment these days just has the
filtering directly on the PSU board, rather than as a separate module. I've
just bypassed it for testing, but I don't want to leave it like that.
You can still get these. The hard part is finding one which will fit
properly unless you are willing to bodge it together a bit. Just search
for "C14 EMI" on eBay and you'll find hundreds of them. Maybe you've
seen them already and were just surprised by how small they have become :) You can also just remove it, and (safely) wire in a
fixed power cord.
Yes, right now I just grabbed a panel-mount IEC connector from a junk PC
PSU and wired that up while I'm testing, I think long-term though I'd
prefer to do it right; it won't make any difference to the terminal, but it
might make other gadgets plugged into the same AC feed a little happier. :-)
cheers
Jules
4:38 p.m.
That reminds me, I still have one or two in the garage (yes, stored in
uncontrolled conditions). Maybe a manual as well. If anyone is
interested, contact me off-list.
I'm in Austin, Texas, USA.
mcl
24 Jan
24 Jan
4:31 a.m.
That reminds me, I still have one or two in the garage
(yes, stored in
uncontrolled conditions). Maybe a manual as well. If anyone is
interested, contact me off-list.
Why do these things always have a Large Body Of Water between me and them :)
Cheers
A
On 23 January 2018 at 21:38, Mark Linimon via cctalk <cctalk at classiccmp.org>
wrote:
That reminds me, I still have one or two in the garage
(yes, stored in
uncontrolled conditions). Maybe a manual as well. If anyone is
interested, contact me off-list.
>
> I'm in Austin, Texas, USA.
>
> mcl
>
--
adrian/witchy
Owner of Binary Dinosaurs, the UK's biggest home computer collection?
www.binarydinosaurs.co.uk
2371
days inactive
2372
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4 comments
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participants (4)
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aaron＠aaronsplace.co.uk -
binarydinosaurs＠gmail.com -
jules.richardson99＠gmail.com -
linimon＠lonesome.com