Hi all,
Question to the group...not a vintage computer problem. A problem with a
much newer system. An Acer Aspire desktop about 10 years old. I'm trying
to sell it and reset windows (vista) to factory original. It locked up'd
during that process and I reset it. Seems the BIOS is now
On Wed, 22 Jul 2015, Chuck Guzis wrote:
On 07/22/2015 10:09 PM, Tothwolf wrote:
One example I can give are some Pentium P55C architecture (Socket 7)
systems which I've been running with minimal downtime for ~15 years.
The original power supplies with their original (and relatively low
quality
I wrote:
>> I proposed it, and was willing to build microcontroller-based boards
>> and write firmware, but IIRC it was decided that there was too little
>> benefit.
On Thu, Jul 23, 2015 at 12:00 PM, William Donzelli wrote:
> That seems odd, considering the lengths you guys took on the caps, and
>
> * I once talked to a power supply guy about over-voltage sensors and
> the like, and he said that over-voltage conditions (like a power
> supply freaking out and giving TTL 8 Volts or something) due to
> component failures are exceedingly rare. When it does happen, it is
> almost always due to
> I proposed it, and was willing to build microcontroller-based boards
> and write firmware, but IIRC it was decided that there was too little
> benefit.
That seems odd, considering the lengths you guys took on the caps, and
the whole museum mentality of keeping things "safe" for the artifacts.
Mi
On Thu, Jul 23, 2015 at 12:06 AM, William Donzelli wrote:
> Did the team ever consider some sort of active monitoring of the
> power, beyond whatever DEC implemented?
I proposed it, and was willing to build microcontroller-based boards
and write firmware, but IIRC it was decided that there was to
> From: Lyle Bickley
> we tested each capacitor for capacitance and ESR
> ...
> Each power supply had to meet it's specifications .. (every test was
> logged and documented).
> ...
> Every year we do a complete DEC specified preventative maintenance on
> the PDP-1
On 2015-07-23 07:09, Tothwolf wrote:
On Tue, 21 Jul 2015, Lyle Bickley wrote:
On Mon, 20 Jul 2015 23:14:36 -0600 Eric Smith wrote:
On Mon, Jul 20, 2015 at 4:46 PM, Rich Alderson
wrote:
industry white papers with tables of decay rates for the aluminum
electrolytics that indicate that, *no ma
On Wed, 22 Jul 2015 09:01:35 -0400 (EDT)
j...@mercury.lcs.mit.edu (Noel Chiappa) wrote:
> > From: Tothwolf
>
> > How do you know those aluminum electrolytic capacitors are functioning
> > just as good as they did when they were new? Unless you've tested them
> > out of circuit ...
On 7/23/2015 12:06 AM, William Donzelli wrote:
As Eric, I'm a member of the PDP-1 Restoration Team. The PDP-1 restoration was
completed in 2005 - and annually we check the power supplies for voltage,
ripple, etc. Not one of the re-formed capacitors have failed in the ten years
since the comple
> As Eric, I'm a member of the PDP-1 Restoration Team. The PDP-1 restoration
> was completed in 2005 - and annually we check the power supplies for voltage,
> ripple, etc. Not one of the re-formed capacitors have failed in the ten years
> since the completion of the restoration.
Did the team ev
On 07/22/2015 10:09 PM, Tothwolf wrote:
One example I can give are some Pentium P55C architecture (Socket 7)
systems which I've been running with minimal downtime for ~15 years. The
original power supplies with their original (and relatively low quality)
capacitors lasted about 15 to 17 years (I
On Tue, 21 Jul 2015, Lyle Bickley wrote:
On Mon, 20 Jul 2015 23:14:36 -0600 Eric Smith wrote:
On Mon, Jul 20, 2015 at 4:46 PM, Rich Alderson
wrote:
industry white papers with tables of decay rates for the aluminum
electrolytics that indicate that, *no matter what*, they lose
capacitance ov
On Wed, Jul 22, 2015 at 9:33 AM, Tothwolf wrote:
> The only
> thing we could know today is if the capacitor passes industry standard tests
> and if the power supply those capacitors are a part of functions correctly
> when fully loaded.
We built a dummy load for testing the DEC Type 728 power sup
Tail and signaling lights put much more stress on the filament. The
headlights are burned steady in practice and will burn out when they
burn out.
I never replace both, and seldom see any correlation. I just put the
spare in the trunk with the kit to get at the lights when they do fail.
I
On 07/22/2015 04:39 AM, tony duell wrote:
Do you seriously replace both headlight bulbs when one fails? I know of
nobody who does that. Generally you carry a spare bulb kit and a screwdriver
and if a bulb fails, pull over and change it.
Why not change all other bulbs on the car at the same time
On Wed, 22 Jul 2015, tony duell wrote:
On Wed, 22 Jul 2015, Noel Chiappa wrote:
I am way out of my knowledge range in this discussion, but here's
something I wanted to ask about: how do you reconcile this observation
(assertion?) with the observations from several people (e.g. the PDP-1
peopl
> From: tony duell
> it's quite possible they started off at the top end of that range, have
> deteriorated over the years, and are still within spec. Of course
> nobody can prove that (unless there are records of the values meaured
> 50 years ago)
Well, I don't know about 50
On Wed, 22 Jul 2015, tony duell wrote:
I think he did answer it. If the unit is operating correctly then the
capacitors must be sufficiently good at that time for that unit.
Now, whether they will go on working is something that is very hard to
tell. But that applies to every other component
>
> Date: Mon, 20 Jul 2015 14:11:46 +
> From: tony duell
> Subject: RE: PDP 11 gear finally moved
> >
> > Replace - yes, *especially* if you don't have a big budget. Aluminum
> > electrolytic capacitors are CHEAP and easy to obtain. Replacement
> > s
On Wed, 22 Jul 2015, tony duell wrote:
Given that a typical aluminum electrolytic capacitor costs anywhere
from $0.12-$0.15 (4mm or 5mm diameter radials) to about $1.00 (12mm or
16mm diameter radial), it also doesn't make much sense to desolder a 20
year old part, spend at a minimum 5 or more
On 7/22/15 7:43 AM, Tothwolf wrote:
I can't say I've previously heard of that being done with automotive bulbs
Then why are tail light bulbs sold in pairs?
I just had one go, and replaced both sides.
On Wed, 22 Jul 2015, tony duell wrote:
On Wed, 22 Jul 2015, ANDY HOLT wrote:
Do you seriously replace both headlight bulbs when one fails? I know of
nobody who does that. Generally you carry a spare bulb kit and a screwdriver
and if a bulb fails, pull over and change it.
and - like the capaci
> > Do you seriously replace both headlight bulbs when one fails? I know of
> > nobody who does that. Generally you carry a spare bulb kit and a screwdriver
> > and if a bulb fails, pull over and change it.
> and - like the capacitor replacement question this is an "it depends".
> For some cars -
>
>> From: Tothwolf
>
>> How do you know those aluminum electrolytic capacitors are functioning
>> just as good as they did when they were new? Unless you've tested them
>> out of circuit ...
> > ... aluminum electrolytic capacitors by their very electrochemical
> > nature
really good caps are "better than specs" and thus deteriorate "into
specs" over time, but all fade eventually. Some may have connectors
that die before the cap inside. Rarely does a cap actually measure
the same exactly as what is printed on the label. The ESR value vs.
the capacity is the fact
> From: Tothwolf
> How do you know those aluminum electrolytic capacitors are functioning
> just as good as they did when they were new? Unless you've tested them
> out of circuit ...
> ... aluminum electrolytic capacitors by their very electrochemical
> nature degrade as t
This thread has gone on for a while and I think we all get the points
here, but one other consideration - how will removing and replacing a
component damage the board? Damage the board and it's game over. One
should always take the overall board's ability to handle replacement.
With the board in
>>>>
From: "tony duell"
To: "General Discussion: On-Topic and Off-Topic Posts"
Sent: Wednesday, 22 July, 2015 12:39:42 PM
Subject: RE: PDP 11 gear finally moved
>
> I might think twice about doing a board that was fragile with age, but
> otherw
> > They reliably do what they're supposed to do.
>
> You didn't answer the question. How do you know those aluminum
> electrolytic capacitors are functioning just as good as they did when they
> were new? Unless you've tested them out of circuit, you simply cannot make
That, actually, is the wr
>
> I might think twice about doing a board that was fragile with age, but
> otherwise, change 'em all. Like replacing both headlight bulbs if one
> goes out--it's just a matter of time before the other one goes.
Do you seriously replace both headlight bulbs when one fails? I know of
nobody who
> > that are running perfectly "just in case"...
>
> How do you -know- they are "running perfectly"? Just because a widget
> itself is functioning, you have no way of knowing if that capacitor is
> working 100% properly /unless/ you actually remove it from circuit and run
> a full battery of test
On Tue, 21 Jul 2015, Mike Stein wrote:
On Tue, 21 Jul 2015, Tothwolf wrote:
On Tue, 21 Jul 2015, Mike Stein wrote:
FWIW I'm certainly not about to spend 100s of dollars, not to mention
time spent in sourcing and replacing, to replace the caps in systems
100s? Where are you sourcing your comp
- Original Message -
From: "Tothwolf"
To: "General Discussion: On-Topic and Off-Topic
Posts"
Sent: Tuesday, July 21, 2015 9:46 PM
Subject: Re: PDP 11 gear finally moved
On Tue, 21 Jul 2015, Mike Stein wrote:
...
FWIW I'm certainly not about to spend
On Tue, 21 Jul 2015, tony duell wrote:
On Mon, 20 Jul 2015, Tothwolf wrote:
Yes, the grid cap would /usually/ be a non-polarized wax paper type,
which tend to be very unreliable. I've yet to find a wax paper type
which will pass a leak test and those are also on my replace on sight
list.
Of
On 07/21/2015 06:56 PM, Tothwolf wrote:
I've often wondered why they even bother to put that polarity stripe on
modern film parts when it doesn't actually indicate the outside foil
terminal. Maybe this is something that has become lost knowledge to
manufacturers over the years to the point where
On 07/21/2015 06:46 PM, Tothwolf wrote:
I dunno about that. When I've done commercial boards such as industrial
process controllers and CPUs for customers with nearly unlimited funds,
I charged the customer based on an hourly rate. Since I use a vacuum
desoldering tool, changing out 10-15 alumin
On Mon, 20 Jul 2015, Mark J. Blair wrote:
On Jul 20, 2015, at 18:02 , Tothwolf wrote:
I replace wax paper types with polyester (mylar), polystyrene or
ceramic discs, depending on how they are used in the circuit (note
however that for wound foil types, modern replacement parts do not mark
th
On Tue, 21 Jul 2015, ben wrote:
On 7/21/2015 9:04 AM, Lyle Bickley wrote:
IMHO, these "white papers" indicating that ALL aluminum electrolytic
capacitors decay is obvious nonsense - based on real life experience
- not someones theory...
The whole problem with the caps is the water between foi
On Tue, 21 Jul 2015, Mike Stein wrote:
I suspect that the real criterion for whether to shotgun-replace caps is
who is paying/getting paid for the materials and labour ;-).
I dunno about that. When I've done commercial boards such as industrial
process controllers and CPUs for customers with
Rich Alderson wrote:
>
>From: Peter Coghlan
>Sent: Saturday, July 18, 2015 1:27 AM
>
>> Rich Alderson wrote:
>
It is generally a good idea to re-form electrolytic capacitors in power
supplies, and to bench check the power supplies (under some kind of
load) before actually applying
On 7/21/2015 9:04 AM, Lyle Bickley wrote:
IMHO, these "white papers" indicating that ALL aluminum electrolytic
capacitors decay is obvious nonsense - based on real life experience
- not someones theory...
The whole problem with the caps is the water between foil. As modern caps
use more and mo
On 21/07/2015 06:14, Eric Smith wrote:
On Mon, Jul 20, 2015 at 4:46 PM, Rich Alderson
wrote:
industry white papers with tables of decay rates for
the aluminum electrolytics that indicate that, *no matter what*, they lose
capacitance over time, until c. 14 years from manufacturer date they are a
- Original Message -
From: "Tothwolf"
Sent: Monday, July 20, 2015 10:03 PM
... I too am getting tired of repeating the same
thing over and over; compiling this sort of
information in a single location might be
helpful.
As it happens I am getting tired of _reading_ the
same thing
On Mon, 20 Jul 2015 23:14:36 -0600
Eric Smith wrote:
> On Mon, Jul 20, 2015 at 4:46 PM, Rich Alderson
> wrote:
> > industry white papers with tables of decay rates for
> > the aluminum electrolytics that indicate that, *no matter what*, they lose
> > capacitance over time, until c. 14 years from
> From: a...@p850ug1.demon.co.uk
> To: cctalk@classiccmp.org
> Subject: RE: PDP 11 gear finally moved
> Date: Sun, 19 Jul 2015 14:35:52 +
>
> >
>
> Be careful, static daamge does not always show up at the time. You can
> damage an IC, have it work for some
>
> > But yes, selenium rectifiers rarely work now (although there are exceptions)
> > and when they fail they can take out the mains transformer. And they smell
> > horrible (think of school dinner cabbage!)
>
> Huh? All devices with selenium rectifiers that I/we own are OK. And a
> selenium rec
On Tue, 21 Jul 2015, tony duell wrote:
But yes, selenium rectifiers rarely work now (although there are exceptions)
and when they fail they can take out the mains transformer. And they smell
horrible (think of school dinner cabbage!)
Huh? All devices with selenium rectifiers that I/we own are O
On Mon, 20 Jul 2015, Rich Alderson wrote:
the aluminum electrolytics that indicate that, *no matter what*, they
lose capacitance over time, until c. 14 years from manufacturer date
they are at 10% of rating.
Please excuse me, but this is utter nonsense.
Most electrolytics in our machines are
On Sun, 19 Jul 2015, dwight wrote:
I have rarely seen static damage to electronic parts. I can imagine that
if I were in Nevada during winter time, I might see more. There were
times when, even with a key to be the discharge point that my arm still
jumped.
On parts, the ones I've seen that I c
On Mon, Jul 20, 2015 at 4:46 PM, Rich Alderson
wrote:
> industry white papers with tables of decay rates for
> the aluminum electrolytics that indicate that, *no matter what*, they lose
> capacitance over time, until c. 14 years from manufacturer date they are at
> 10%
> of rating.
That's very i
> I've not replaced any in a PDP11 power supply, however I have replaced
> them in other equipment with equally large PSUs. In the odd case where a
> computer grade screw terminal capacitor is extremely expensive or
> completely unobtainable (those which I've purchased were under $20-30) I
> might
On Mon, 20 Jul 2015, Rich Alderson wrote:
On Sat, 18 Jul 2015, Peter Coghlan wrote:
Rich Alderson wrote:
It is generally a good idea to re-form electrolytic capacitors in
power supplies, and to bench check the power supplies (under some
kind of load) before actually applying power to the wh
On Mon, 20 Jul 2015, tony duell wrote:
Replace - yes, *especially* if you don't have a big budget. Aluminum
electrolytic capacitors are CHEAP and easy to obtain. Replacement
semiconductors by comparison are expensive and can be quite difficult
to find.
Err, have you priced the screw-terminal
> On Jul 20, 2015, at 18:02 , Tothwolf wrote:
> I replace wax paper types with polyester (mylar), polystyrene or ceramic
> discs, depending on how they are used in the circuit (note however that for
> wound foil types, modern replacement parts do not mark the outside foil,
> which needs to be
On Mon, 20 Jul 2015, Mark J. Blair wrote:
Now on the topic of capacitors: The only component type that I replace
on sight at this point are the Rifa paper-dielectric EMI suppression
caps. Had one go incendiary on me so far, and I do a replace-on-sight
routine on them because my hypothesis of t
From: Peter Coghlan
Sent: Saturday, July 18, 2015 1:27 AM
> Rich Alderson wrote:
>>> It is generally a good idea to re-form electrolytic capacitors in power
>>> supplies, and to bench check the power supplies (under some kind of
>>> load) before actually applying power to the whole unit.
>> It
If I may go back to the original post topic for a moment, what model is that
line printer that is pictured? I'm on the lookout for a DEC LP32 to go with my
11/730.
Now on the topic of capacitors: The only component type that I replace on sight
at this point are the Rifa paper-dielectric EMI sup
>
> Replace - yes, *especially* if you don't have a big budget. Aluminum
> electrolytic capacitors are CHEAP and easy to obtain. Replacement
> semiconductors by comparison are expensive and can be quite difficult to
> find.
Err, have you priced the screw-terminal 'computer grade' electolytic capa
On 07/19/2015 02:03 AM, tony duell wrote:
So, tony, if I'm correct, you just called "bullshit", right?
I assume this relates to my comments on static damage of PDP11 PSUs,
I am not sure I would quite put it that way (not on a public list :-)) but (a)
I have never seen a DEC
PSU (in a PDP11 o
Well, all I can say is that my experience differs. I have had newer capacitors
fail, and old ones, too, of course, but nothing points to wholesale replacement
as a cost or time effective strategy, especially on something like an Altair.
FWIW, I don't run my vintage machines all that often. Of
On Fri, 17 Jul 2015, tony duell wrote:
Perhaps. But not all of it, certainly. I'm currently four for four
fixing dead flatscreens by re-capping their power supplies; I imagine
others have similar experiences. It's not a huge stretch to imagine
This could be taken to show that modern capaci
On Fri, 17 Jul 2015, Todd Killingsworth wrote:
I suspect part of the "swap'em ALL out" mentality comes from the 90's
when some botched industrial espionage had some of the bottom-tier cap
manufacturers using a dodgy electrolytic formula for their caps. These
caps would have a frequent failure
On Fri, 17 Jul 2015, Jay Jaeger wrote:
On 7/17/2015 1:33 PM, Rich Alderson wrote:
It is generally a good idea to re-form electrolytic capacitors in
power supplies, and to bench check the power supplies (under some kind
of load) before actually applying power to the whole unit.
It is always a
>
> I have rarely seen static damage to electronic parts. I can imagine
> that if I were in Nevada during winter time, I might see more. There
> were times when, even with a key to be the discharge point that
> my arm still jumped.
Be careful, static daamge does not always show up at the time. Yo
I have rarely seen static damage to electronic parts. I can imagine
that if I were in Nevada during winter time, I might see more. There
were times when, even with a key to be the discharge point that
my arm still jumped.
On parts, the ones I've seen that I could definitely attribute to static
were
>
> So, tony, if I'm correct, you just called "bullshit", right?
I assume this relates to my comments on static damage of PDP11 PSUs,
I am not sure I would quite put it that way (not on a public list :-)) but (a)
I have never seen a DEC
PSU (in a PDP11 or elsewhere) damaged by static, certainl
So, tony, if I'm correct, you just called "bullshit", right?
--
--- Dave Woyciesjes
--- ICQ# 905818
--- CompTIA A+ Certified IT Tech -http://certification.comptia.org/--- HDI
Certified Support Center Analyst -http://www.ThinkHDI.com/Registered Linux user
number 464583
"Computers have lots of m
Thank you all for the information. Ive been speaking with Paul Anderson on
the phone, he went into great detail a general overview on how to get the
machine apart and general beginner details. He referred me to the
appropriate Documents on bitsavers, plan is to pick up some packs of paper
and get t
More myths and ledgends.
As I remember it this all started with the arrival of FET's having a
very high input impedance due to narrow gate areas.
If you were daft enough not to have a path to earth
and let a charge build up on the gate then you could exceed the
breakdown voltage across the ju
>
> Oh, sorry, didn't realize they used switchers for the PDP-11s.
There have been _many_ DEC PSU designed used for the PDP11. I think all of them
used some
kind of switching regulator for the +5V line. A quick glance at the printsets
will settle it..
> However I was talking with a friend of
On 07/17/2015 11:17 PM, tony duell wrote:
On the other hand if the +5V line did get too high it could have wiped out
just about every IC in the unit. Ouch!. I've only ever had this happen once, and
it was in a much lesser machine than a PDP11 (fortunately).
Many years ago, I managed to feed +12
Oh, sorry, didn't realize they used switchers for the PDP-11s.
However I was talking with a friend of mine last night about my error,
and he told me that the switching supplies for the PDP-11s were very
unreliable back in the day. He often had to troubleshoot the machines
back then. A common f
Rich Alderson wrote:
>
> > It is generally a good idea to re-form electrolytic capacitors in power
> > supplies, and to bench check the power supplies (under some kind of
> > load) before actually applying power to the whole unit.
>
> It is always a good idea to replace electrolytic capacitors in
What I am wondering about, though, is the extra current they draw while
they are forming up while the power supply is running. The capacitor
might survive it (not get so hot that it fails), but the things supply
the higher than ordinary current to it might not. Killed a bridge
rectifier on a PDP-
> U - his PDP-11/34 most certainly does use switching power
> regulators. ;)
True, but I still haven't had major capacitor problems in one.
-tony
>
> I had to do some cap replacement on some older Motorola tube radios,I have
> some basic soldering skills. I was under the impression that the capacitors
> in computer equipment this big from this year would have been of better
> quality and it would not be an issue.
In general I will agree wit
> Thank you for the detailed information. I need to figure out how im going
> to get it out of the rack and moved to a place where i can test it over the
> next couple days where it will not be in the way. Ill find some way to do
> a dummy load and do an extended test to be sure the supply is wor
U - his PDP-11/34 most certainly does use switching power
regulators. ;)
On 7/17/2015 4:06 PM, John Robertson wrote:
> On 07/17/2015 11:53 AM, Mouse wrote:
>>> I do find this witch-hunt against capacitors to be curious, given how
>>> few I've found to have failed. I suspect a lot of it comes
I tend to agree with your hunch.
On 7/17/2015 1:55 PM, Todd Killingsworth wrote:
> I suspect part of the "swap'em ALL out" mentality comes from the 90's when
> some botched industrial espionage had some of the bottom-tier cap
> manufacturers using a dodgy electrolytic formula for their caps. Thes
That might be a little different -- much more recent - presumably in the
ear of flat screens and PCs where there have been times when
manufacturers got fed bad capacitors for their boards - which then
failed later. IBM replaced a whole series of motherboards in one
organization that I worked at be
Replace - no, I don't agree - especially not for those of us who don't
have the kind of budget that your organization has. In my experience,
for equipment of this quality and vintage, 95% or more of the time an
hour to a few hours of re-forming is all that is necessary - and as Tony
has pointed ou
On 07/17/2015 11:53 AM, Mouse wrote:
I do find this witch-hunt against capacitors to be curious, given how
few I've found to have failed. I suspect a lot of it comes from
audiophools who think this is the way to fix anything...
Perhaps. But not all of it, certainly. I'm currently four for fou
I had to do some cap replacement on some older Motorola tube radios,I have
some basic soldering skills. I was under the impression that the capacitors
in computer equipment this big from this year would have been of better
quality and it would not be an issue.
I have someone scheduled to come out
I was operating the panel when i first got it, now the numbers do not light
up, panel is unresponsive, and run light stays lit.(just describing the
behavior, i will not start it back up till I work on the power supply)
On Fri, Jul 17, 2015 at 3:50 PM, devin davison wrote:
> I had to do some cap
Thank you for the detailed information. I need to figure out how im going
to get it out of the rack and moved to a place where i can test it over the
next couple days where it will not be in the way. Ill find some way to do
a dummy load and do an extended test to be sure the supply is working
prop
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of tony
duell
> Sent: 17 July 2015 20:23
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: RE: PDP 11 gear finally moved
>
>
> > When I repaired my VT10
On 2015-Jul-17, at 11:42 AM, tony duell wrote:
>>> It is generally a good idea to re-form electrolytic capacitors in power
>>> supplies, and to bench check the power supplies (under some kind of
>>> load) before actually applying power to the whole unit.
>>
>> It is always a good idea to replace e
> When I repaired my VT100s I had to replace all the electrolytic caps on the
> monitor control board to cure the screen wobble. Before doing so I had
> reformed them all and I had tested them all for ESR and they had all tested
> fine so I was unable to determine which of them was the bad one. Pe
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of tony
duell
> Sent: 17 July 2015 19:56
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: RE: PDP 11 gear finally moved
>
> >
> > Perhaps. But not all of
>
> Perhaps. But not all of it, certainly. I'm currently four for four
> fixing dead flatscreens by re-capping their power supplies; I imagine
> others have similar experiences. It's not a huge stretch to imagine
This could be taken to show that modern capacitors are not reliable, and given
th
some are good some are bad.
http://www.badcaps.net/
here is all the info you ever need on today's bad caps
not so much on yesteryears bad caps
On 7/17/2015 11:53 AM, Mouse wrote:
>> I do find this witch-hunt against capacitors to be curious, given how
>> few I've found to have failed. I
I suspect part of the "swap'em ALL out" mentality comes from the 90's when
some botched industrial espionage had some of the bottom-tier cap
manufacturers using a dodgy electrolytic formula for their caps. These
caps would have a frequent failure rate..
While not an issue for pre-90's electronics
> I do find this witch-hunt against capacitors to be curious, given how
> few I've found to have failed. I suspect a lot of it comes from
> audiophools who think this is the way to fix anything...
Perhaps. But not all of it, certainly. I'm currently four for four
fixing dead flatscreens by re-c
>
> > It is generally a good idea to re-form electrolytic capacitors in power
> > supplies, and to bench check the power supplies (under some kind of
> > load) before actually applying power to the whole unit.
>
> It is always a good idea to replace electrolytic capacitors in power supplies.
Cou
>
> I was trying to enter a short program at the front panel and there was a
> clicking sound followed by a burning smell. I cut the power, the front
> panel is unresponsive now, so I'm going to need to look over the power
Did you see anything on the panel when it died (was the numeric display st
It is generally a good idea to re-form electrolytic capacitors in power
supplies, and to bench check the power supplies (under some kind of
load) before actually applying power to the whole unit.
JRJ
On 7/17/2015 11:49 AM, devin davison wrote:
> Devin here, I had asked for advice on how to move a
> It is generally a good idea to re-form electrolytic capacitors in power
> supplies, and to bench check the power supplies (under some kind of
> load) before actually applying power to the whole unit.
I am not sure either would have done much good here. The OP said it
ran OK for an hour or so, w
> It is generally a good idea to re-form electrolytic capacitors in power
> supplies, and to bench check the power supplies (under some kind of
> load) before actually applying power to the whole unit.
It is always a good idea to replace electrolytic capacitors in power supplies.
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