5 May
2010
5 May
'10
11:25 p.m.
for a DEC GIGI (VK100) I recently acquired. Many of the keycaps on the GIGI
pull off very easily so little surprise it is missing a couple.
http://picasaweb.google.com.au/lh/photo/Bdb1fRKIjtP6Q0CebliU-g?feat=directl…
(Aside: on powerup it promptly had conniptions and also needs parts for the
PSU - fortunately easy to find at our local electronics store).
6 May
6 May
11:09 a.m.
for a DEC GIGI (VK100) I recently acquired. Many of the keycaps on the GIGI
pull off very easily so little surprise it is missing a couple.
With this design of keyboard (used by many manufacturers), sometimes th
hollow square plastic key plungers split (often at a corser). This
remults in the keycaps falling off easily, it also means the keys tend to
stick.
One trick I've used in the past is to move the defective plungers onto
litle-used keys (in my case the numeric keypad).
THe HP85 service manual gives some information on taking these keyboards
apart. You cna reuse the plungers, though. I don't suppose anyoen has the
tool for insering new contacts, do they?
http://picasaweb.google.com.au/lh/photo/Bdb1fRKIjtP6Q0CebliU-g?feat=directl…
(Aside: on powerup it promptly had conniptions and also needs parts for the
PSU - fortunately easy to find at our local electronics store).
What fialed? Isn't this a swticher? If the chopper transistor has failed
(and it did in a couple of VT100s here),, you need to check surrounding
components (particularly low-value resisotrs) too.
-tony
6:29 p.m.
On Fri, May 7, 2010 at 4:09 AM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
yes a switcher, more pictures here including the exploded/over-stressed
metallised polyester capacitor, which was across the mains:
http://picasaweb.google.com.au/109027456703228169358/20100504DECGIGI#
someone on IRC mentioned that this Aztec PSU is very similar to the one in
the Apple ///
(Aside: on
powerup it promptly had conniptions and also needs parts for
the
PSU - fortunately easy to find at our local
electronics store).
What fialed? Isn't this a swticher? If the chopper transistor has failed
(and it did in a couple of VT100s here),, you need to check surrounding
components (particularly low-value resisotrs) too.
6:56 p.m.
Hi
I've seen that type of keyboard before. I'd been looking for
Canon Cat key switches for a friend. It wasn't the Cat though.
I think these are the same as the H89 Heathkit uses. I could
be wrong but it is worth a look. You may not get a matching
text but at least it may give one a key to hit.
Dwight
Date: Fri, 7 May 2010 11:29:21 +1000
Subject: Re: seeking DEC VT100-style keyboard keycaps SETUP and NOSCROLL
From: nigel.d.williams at gmail.com
To: cctalk at classiccmp.org
On Fri, May 7, 2010 at 4:09 AM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
yes a switcher, more pictures here including the exploded/over-stressed
metallised polyester capacitor, which was across the mains:
http://picasaweb.google.com.au/109027456703228169358/20100504DECGIGI#
someone on IRC mentioned that this Aztec PSU is very similar to the one in
the Apple ///
_________________________________________________________________
The New Busy is not the old busy. Search, chat and e-mail from your inbox.
http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:…
(Aside:
on powerup it promptly had conniptions and also needs parts for
the
PSU - fortunately easy to find at our local
electronics store).
What fialed? Isn't this a swticher? If the chopper transistor has failed
(and it did in a couple of VT100s here),, you need to check surrounding
components (particularly low-value resisotrs) too.
7 May
7 May
12:40 p.m.
Hi
I've seen that type of keyboard before. I'd been looking for
Canon Cat key switches for a friend. It wasn't the Cat though.
I think these are the same as the H89 Heathkit uses. I could
Yes. That keyboard design turns up in (at least) :
TRS-80 Model 1 (early version)
DEC VT50-seires, Vt100-series terminals
HP262x terminals
HP9816 (compact keyboard)
HP80-series (including the 9915)
TI99/4a
be wrong but it is worth a look. You may not get a matching
text but at least it may give one a key to hit.
My HP9816 came without the left shift key. Raiding my junk box (!) I
found a 'spare' VT52 keyboard PCB. The left shift key from that was the
wrong style and wrong colour, but it was the right size. So I fitted it.
If I ever manage to find the correct key I can swap it back, and until
then, I have somethign I can press.
-tony
Dwight
=20
n
Date: Fri=2C 7 May 2010 11:29:21 +1000
Subject: Re: seeking DEC VT100-style keyboard keycaps SETUP and NOSCROLL
From: nigel.d.williams at gmail.com
To: cctalk at classiccmp.org
=20
On Fri=2C May 7=2C 2010 at 4:09 AM=2C Tony Duell <ard at p850ug1.demon.co.uk=
wrote:
=20
> > (Aside: on powerup it promptly had conniptions and also needs parts f=
or
> the
> > PSU - fortunately easy to find at our local electronics store).
>
> What fialed? Isn't this a swticher? If the chopper transistor has faile=
d
> (and it did in a couple of VT100s
here)=2C=2C you need to check surroun=
ding
components (particularly low-value resisotrs) too.
=20
yes a switcher=2C more pictures here including the exploded/over-stressed
metallised polyester capacitor=2C which was across the mains:
=20
http://picasaweb.google.com.au/109027456703228169358/20100504DECGIGI#
=20
someone on IRC mentioned that this Aztec PSU is very similar to the one i= the Apple ///
=20
_________________________________________________________________
The New Busy is not the old busy. Search=2C chat and e-mail from your inbox=
.
http://www.windowslive.com/campaign/thenewbusy?ocid=3DPID28326::T:WLMTAGL:O=
N:WL:en-US:WM_HMP:042010_3=
12:37 p.m.
On Fri, May 7, 2010 at 4:09 AM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
yes a switcher, more pictures here including the exploded/over-stressed
metallised polyester capacitor, which was across the mains:
Ah, an antisocial mains filter capacitor. It happens...
IIRC there are several classes of such capacitors. One type is designed
to go across the mains, the otehr type (which cannot fail shorted) is
designed to go from one side of the mains to ground. I think they're 'X'
and 'Y2' respectively. But you need ot check.
Remember it's the AC voltage rating that matters. A capacitor rated at
250V DC sill not stand European mains.
(Aside:
on powerup it promptly had conniptions and also needs parts for
the
PSU - fortunately easy to find at our local
electronics store).
What fialed? Isn't this a swticher? If the chopper transistor has failed
(and it did in a couple of VT100s here),, you need to check surrounding
components (particularly low-value resisotrs) too.
http://picasaweb.google.com.au/109027456703228169358/20100504DECGIGI#
someone on IRC mentioned that this Aztec PSU is very similar to the one in
the Apple ///
SMPSUs tend to be bought-in, and similar designs turn up in various
manufactueres products. Even when the supply was a custom design, often
the circuitry is similar in various models (for example the Boschert PSU
used in some HP mass storage units is electronically very similar ot the
Boschert PSU used in the HP120)
-tony
5125
days inactive
5126
days old
5 comments
3 participants
participants (3)
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ard＠p850ug1.demon.co.uk -
dkelvey＠hotmail.com -
nigel.d.williams＠gmail.com