I'm just curious how many people have powered up their TRS-80 computers,
and ended up with a bang and a room filled with smoke?
So far, I've gotten the fireworks in two out of two TRS-80s (model 3 and
4) when they were powered up. In both cases, the problem was with the
main line filter
I have had this problem in various PSUs, particularly in MicroVAXen. In my case
replacing them has been fairly straightforward. Not had this with my TRS-80
(Model 1) though. I think it is a fairly common problem.
Regards
Rob
> -Original Message-
> From: cctalk On Behalf Of Marvin
On 28/08/2019 09:15, Marvin Johnston via cctalk wrote:
> I'm just curious how many people have powered up their TRS-80
> computers, and ended up with a bang and a room filled with smoke?
>
> So far, I've gotten the fireworks in two out of two TRS-80s (model 3
> and 4) when they were powered up. In
At 01:15 AM 28/08/2019 -0700, you wrote:
>I'm just curious how many people have powered up their TRS-80 computers,
>and ended up with a bang and a room filled with smoke?
>
>So far, I've gotten the fireworks in two out of two TRS-80s (model 3 and
>4) when they were powered up. In both cases, the
Matt wrote:
> On 28/08/2019 09:15, Marvin Johnston via cctalk wrote:
> > I'm just curious how many people have powered up their TRS-80
> > computers, and ended up with a bang and a room filled with smoke?
> >
> > So far, I've gotten the fireworks in two out of two TRS-80s (model 3
> > and 4) when
On Wed, Aug 28, 2019, 8:35 AM Ethan Dicks via cctalk
wrote:
> On Wed, Aug 28, 2019 at 4:16 AM Marvin Johnston via cctalk
> wrote:
> > I'm just curious how many people have powered up their TRS-80 computers,
> > and ended up with a bang and a room filled with smoke?
>
Trs 80 III / 4 absolutely
It was at the Maker Faire, 1 year ago, we had these caps blow on 2 Apple II's.
One ran for less than an hour before going and the other ran for a day and the
next day it also blew ( it was my Apple II ). It now lives without the
capacitor.
Dwight
From: cctalk
> On Aug 28, 2019, at 4:15 AM, Marvin Johnston via cctalk
> wrote:
>
> I'm just curious how many people have powered up their TRS-80 computers, and
> ended up with a bang and a room filled with smoke?
>
> So far, I've gotten the fireworks in two out of two TRS-80s (model 3 and 4)
> when
On 8/27/19 10:38 PM, Chuck Guzis via cctalk wrote:
I'd probably just use 91% isopropanol. No water to speak of, doesn't
bother plastics--and cheap.
I do normally use it on boards for general cleaning - I was just assuming
that this nasty sticky foam would be too much for it. I'll give it a
On Wed, Aug 28, 2019 at 07:07:21PM +1000, Guy Dunphy via cctalk wrote:
[...]
> RIFA caps may be the most hated components in electronics. Even worse than
> dipped
> tantalums, popped electrolytics, and decaying urethane foam.
Amiga collectors would say "batteries", since Commodore selected a
On Wed, 28 Aug 2019 at 10:16, Marvin Johnston via cctalk
wrote:
>
> I'm just curious how many people have powered up their TRS-80 computers,
> and ended up with a bang and a room filled with smoke?
"They all do that, sir."
Computers older than 20y or so, that is. :-(
--
Liam Proven -
On Wed, Aug 28, 2019 at 4:16 AM Marvin Johnston via cctalk
wrote:
> I'm just curious how many people have powered up their TRS-80 computers,
> and ended up with a bang and a room filled with smoke?
I've had identical experiences with Rifa caps as others here. One
thing about them, you don't
> -Original Message-
> From: cctalk On Behalf Of Guy Dunphy via
> cctalk
> Sent: 28 August 2019 10:07
> To: Marvin Johnston ; General Discussion: On-Topic and
> Off-Topic Posts
> Subject: Re: TRS-80 Fireworks
>
> At 01:15 AM 28/08/2019 -0700, you wrote:
> >I'm just curious how many
Thanks everyone for the feedback... I had no idea. I'll be putting in an
order today with Digi-key (P/N 399-7483-ND) for probably around 25+ caps
or so since I have at least that many TRS-80 2s, 3s, 4s.
I guess my only question is are there other similar caps that also need
to be replaced?
Almost all of my Model 100s (around 8 or so) need to have all of the
electrolytics replaced. For some reason, they started leaking and
causing a problem with desoldering the bad parts. Upon close
examination, the leaking caps can be detected relatively easily. Some
information I saw somewhere
On Wed, Aug 28, 2019 at 5:06 PM Ethan O'Toole via cctalk
wrote:
>
>
> We were at this HOPE conference in NYC. We were helping with it in those
> days, so we had some equipment at the ops area. A whole bunch of commotion
> went down in the OPS area, including someone grabbing a fire extingisher
>
We were at this HOPE conference in NYC. We were helping with it in those
days, so we had some equipment at the ops area. A whole bunch of commotion
went down in the OPS area, including someone grabbing a fire extingisher
and jumping.
Watching this from a-far, we chuckled and I said, "Good
The article I found online was:
http://www.akhara.com/trs-80/psrepair/index.html
But the reference you posted gave me some excellent perspective on the
what is what and why :)!
Marvin
On 8/28/2019 6:50 AM, W2HX wrote:
Be sure to read this article. The caps used in this capacity (pun
> On Aug 28, 2019, at 10:10 AM, Marvin Johnston via cctalk
> wrote:
>
> Almost all of my Model 100s (around 8 or so) need to have all of the
> electrolytics replaced. For some reason, they started leaking and causing a
> problem with desoldering the bad parts. Upon close examination, the
indicated that the Chinese caps are the worst offenders... they stole the
formula but apparently "modified" it slightly ending up with future problems.
That was a while ago, and post-TRS-80 era.
Some of this information falls into the "I don't know what I don't know"
catagory. Nice having the
> On Aug 28, 2019, at 9:34 AM, Marvin Johnston via cctalk
> wrote:
>
> Thanks everyone for the feedback... I had no idea. I'll be putting in an
> order today with Digi-key (P/N 399-7483-ND) for probably around 25+ caps or
> so since I have at least that many TRS-80 2s, 3s, 4s.
>
> I guess
Be sure to read this article. The caps used in this capacity (pun intended) are
specialized...
https://www.allaboutcircuits.com/technical-articles/safety-capacitor-class-x-and-class-y-capacitors/
From: cctalk on behalf of Marvin Johnston via
cctalk
I'm with Chuck on this one, I've use 91% on the foam gunk and it has worked. A
similar product in the US is called GooGone. It can remove stenciled part
labels and attacks some plastic.
Dwight
From: cctalk on behalf of Jules Richardson via
cctalk
Sent:
On Wed, Aug 28, 2019 at 6:07 PM Marvin Johnston via cctalk
wrote:
>
> While getting ready to order some Kemet caps from Digi-key (same P/N
> posted earlier), I noticed they all had "RIFA" on them. Is this a big
> OOPS to order them, or would they be okay?
>
> I tend to prefer fixing something
I had the cover off one of the newer style Model 12/16B/6000 floppy
expansion units (nicknamed "The Toaster"). As my wife walked by one
of the Rifa caps blew and a fragment hit her shin. She was not
happy. Mostly from the flash and loud pop. It also scared the cat
that was sitting on a chair
Does anyone have the schematic or manual for the version of the Phi-Deck
that had the servoed Universal Motion Control capstan or the remote control box?
A picture is up under
http://bitsavers.org/pdf/phitech/pictures/phi-deck_motion_ctl.JPG
While getting ready to order some Kemet caps from Digi-key (same P/N
posted earlier), I noticed they all had "RIFA" on them. Is this a big
OOPS to order them, or would they be okay?
I tend to prefer fixing something once :).
Marvin
> On Aug 28, 2019, at 1:12 PM, Tony Duell via cctalk
> wrote:
>>
> Some people avoid RIFA capacitors, I don't...
>
> A Model 4 is going to be over 30 years old now. And (I assume) the
> original capacitors
> have been fine up until now. So if the replacements last as long I'll
> be fixing it
Quite normal - the capacitors dry out after about 30 or 40 years - there's
lots of info around on replacing them with a polymer capacitor. I have over 20
TRS-80's with a large contingent of Model 3, 4, 4Ps, 12 and 16s - all had the
same issue so if I acquire one now I do a pre-emptive strike
Hello all,
S100 based computers have the same problem. I have had the caps in
the PS and on the individual boards go boom. Common failure mode for
electrolytics and tantalums.
GOD Bless,
rich!
On 8/28/2019 3:10 AM, Peter Corlett via cctalk wrote:
On Wed, Aug 28, 2019 at 07:07:21PM +1000,
On 8/28/2019 4:50 PM, Kevin Parker via cctalk wrote:
Quite normal - the capacitors dry out after about 30 or 40 years - there's
lots of info around on replacing them with a polymer capacitor. I have over 20
TRS-80's with a large contingent of Model 3, 4, 4Ps, 12 and 16s - all had the
same
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