Digest for sci.electronics.repair@googlegroups.com - 18 updates in 5 topics

Mad Roger <rogermadd@yahoo.com>: Jul 27 12:05AM

On Tue, 25 Jul 2017 15:01:45 -0000 (UTC),
Mad Roger wrote:
 
> setup, where the current set of connections includes a few things that we
> can discount, such as an autoupdate of some sort, and speedials and some
> search engine updates.
 
Just for the record, here are the startup calls Opera makes to the search
engines, even with everything possible in the settings turned off.
 
These are in order, with, I think, all but the last two not being
important, I don't think, for our purpose, and hence can be filtered out.
 
# Result Protocol Host URL Body Caching Content-Type Process Comments Custom
2 200 HTTP www.google.com /favicon.ico 1,494 public, max-age=691200; Expires: Tue, 01 Aug 2017 08:13:18 GMT image/x-icon opera:2616
 
# Result Protocol Host URL Body Caching Content-Type Process Comments Custom
3 200 HTTP Tunnel to duckduckgo.com:443 0 opera:2616
 
# Result Protocol Host URL Body Caching Content-Type Process Comments Custom
4 200 HTTP www.bing.com /s/a/bing_p.ico 300 public, max-age=15552000 image/x-icon opera:2616
 
# Result Protocol Host URL Body Caching Content-Type Process Comments Custom
5 200 HTTP Tunnel to www.amazon.com:443 0 opera:2616
 
# Result Protocol Host URL Body Caching Content-Type Process Comments Custom
6 200 HTTP Tunnel to www.wikipedia.org:443 0 opera:2616
 
# Result Protocol Host URL Body Caching Content-Type Process Comments Custom
7 200 HTTP Tunnel to search.yahoo.com:443 0 opera:2616
 
# Result Protocol Host URL Body Caching Content-Type Process Comments Custom
8 200 HTTP www.ecb.europa.eu /stats/eurofxref/eurofxref-daily.xml 1,624 text/xml opera:2616
 
# Result Protocol Host URL Body Caching Content-Type Process Comments Custom
9 200 HTTP Tunnel to autoupdate.geo.opera.com:443 0 opera:2616
 
I think of the nine connections that happen at startup, only #8 and #9 seem
significant for our purpose.
"pfjw@aol.com" <pfjw@aol.com>: Jul 27 04:03AM -0700

Please don't feed the troll.
"Gareth Magennis" <soundserviceleeds@outlook.com>: Jul 26 07:44PM +0100

My test bench has for many years had a couple of ground isolated Neve 1:1
transformers between XLR input test sockets and stereo monitors.
 
Which has never been a problem, but has ALWAYS been a problem connecting any
CryBaby Wah Wah pedal.
 
If you do, the CryBaby resonates at full volume, behaving much like turning
a VCF resonance control to full, so it self oscillates.
Why is that?
 
I guess that means you could never directly connect a CryBaby to any
transformer balanced mixer input.
 
 
 
 
Circuit here:
 
 
http://www.electrosmash.com/crybaby-gcb-95
 
 
 
Gareth.
"pfjw@aol.com" <pfjw@aol.com>: Jul 26 12:32PM -0700

Just for giggles, have you tried reversing the plug polarity?
 
Peter Wieck
Melrose Park, PA
"Gareth Magennis" <soundserviceleeds@outlook.com>: Jul 26 08:50PM +0100

wrote in message
news:e3c0123d-c6f9-4d53-ae57-140a34499745@googlegroups.com...
 
Just for giggles, have you tried reversing the plug polarity?
 
Peter Wieck
Melrose Park, PA
 
******************************************************************
 
 
No,I thought as it is transformer and ground isolated it shouldn't matter.
 
 
Gareth.
"Gareth Magennis" <soundserviceleeds@outlook.com>: Jul 26 08:53PM +0100

"Gareth Magennis" wrote in message news:Co6eB.357659$_F5.107046@fx40.am4...
 
 
 
wrote in message
news:e3c0123d-c6f9-4d53-ae57-140a34499745@googlegroups.com...
 
Just for giggles, have you tried reversing the plug polarity?
 
Peter Wieck
Melrose Park, PA
 
******************************************************************
 
 
No,I thought as it is transformer and ground isolated it shouldn't matter.
 
 
Gareth.
 
 
 
 
**************************************************************
 
 
The output goes into an inductor, the CryBaby doesn't seem to like it.
 
 
 
Gareth.
"pfjw@aol.com" <pfjw@aol.com>: Jul 26 01:16PM -0700

On Wednesday, July 26, 2017 at 3:51:02 PM UTC-4, Gareth Magennis wrote:
 
 
> No,I thought as it is transformer and ground isolated it shouldn't matter.
 
> Gareth.
 
If you have the typical "Hot-Neutral" configuration, it does - well - better stated, it can. It does not matter only with hot-hot configurations such as US 240V single-phase connections. Try reversing, and please let us know.
 
Peter Wieck
Melrose Park, PA
"Gareth Magennis" <soundserviceleeds@outlook.com>: Jul 26 10:33PM +0100

wrote in message
news:96f2aad0-4bc3-4cee-b9d8-081d277f49bb@googlegroups.com...
 
On Wednesday, July 26, 2017 at 3:51:02 PM UTC-4, Gareth Magennis wrote:
 
 
> No,I thought as it is transformer and ground isolated it shouldn't matter.
 
> Gareth.
 
If you have the typical "Hot-Neutral" configuration, it does - well - better
stated, it can. It does not matter only with hot-hot configurations such as
US 240V single-phase connections. Try reversing, and please let us know.
 
Peter Wieck
Melrose Park, PA
 
 
 
************************************************************
 
 
Hi Peter, I think you have the wrong end of the stick.
 
 
This is a guitar effects pedal, a "Wah Wah".
It is a resonant circuit that emphasises mid frequencies to produce vowel
like sounds when played with a guitar.
 
 
The "problem" I have always had is that you cannot connect this to a
transformer based pre-amp, as it would seem the inductive load affects the
circuitry in a way that seems to make the resonant circuit resonate like
crazy.
This unit is intended to plug into a guitar amplifier, not a transformer
based test bed, where it misbehaves.
 
 
 
Gareth.
Phil Allison <pallison49@gmail.com>: Jul 26 04:39PM -0700

Gareth Magennis wrote:
 
-------------------------
 
> My test bench has for many years had a couple of ground isolated Neve 1:1
> transformers between XLR input test sockets and stereo monitors.
 
** Are they toroidal, red coloured with black potting in the centre ?
 
> Why is that?
 
> I guess that means you could never directly connect a CryBaby to any
> transformer balanced mixer input.
 
** You need an active DI for that job, preferably with JFET input.
 
Maybe you could add 48V phantom for it to one of the XLRs with two 6.8kohms.
 
 
 
...... Phil
..... Phil
"pfjw@aol.com" <pfjw@aol.com>: Jul 27 04:03AM -0700

Gareth:
 
I know what it is - I have repaired a number similar devices for my neighbor. I suggest what I suggest due to (limited) direct experience with such devices.
 
If you try this suggestion and it works, good. If not, no loss.
 
Next thing to look for would be cold-solders or poor connections - most of what I fixed for my neighbor.
 
Peter Wieck
Melrose Park, PA
Mark Zacharias <mark_zacharias@sbcglobal.net>: Jul 26 12:41PM -0700

> Hi, may I ask for some advice? I have an Onkyo 5009 AV Reciever with the very common problem of overheating HDMI board. You can see it just under the grill for cooling in the case. I have an infrared heat sensitive camera and discovered there are several small ic's that get very hot very quickly- i.e. 70-80c. The ICs are very small, 10mmx10mm up to 10mmx16mm and thereabouts but there is space of about an inch above so room for a heat sink maybe? What would you chose to do? Fit heat sinks to those chips(if there are any small enough) or fit fans directly above the board? I'd really welcome your advice.
 
> Steve
 
It's the larger BGA chips that suffer from the heat. Recent vintage Onkyo's are notorious for this.
Arfa Daily <arfa.daily@ntlworld.com>: Jul 27 01:39AM +0100

On 26/07/2017 20:41, Mark Zacharias wrote:
>> Hi, may I ask for some advice? I have an Onkyo 5009 AV Reciever with the very common problem of overheating HDMI board. You can see it just under the grill for cooling in the case. I have an infrared heat sensitive camera and discovered there are several small ic's that get very hot very quickly- i.e. 70-80c. The ICs are very small, 10mmx10mm up to 10mmx16mm and thereabouts but there is space of about an inch above so room for a heat sink maybe? What would you chose to do? Fit heat sinks to those chips(if there are any small enough) or fit fans directly above the board? I'd really welcome your advice.
 
>> Steve
 
> It's the larger BGA chips that suffer from the heat. Recent vintage Onkyo's are notorious for this.
 
As Mark says ...
 
Over here in the UK, Onkyo have a free repair service when this board
fails due to chips unsoldering themselves. You enter the unit's serial
number into a website, and it immediately tells you if it qualifies for
free repair. If it does, you fill in address details, and they arrange
to collect it and return it fixed, usually within a week.
 
 
Arfa
lmmcams@gmail.com: Jul 27 12:58AM -0700

I have sent it for repair once free of charge, but don't want to have to do it again, and if by keeping it cooler I can prevent it, I'd like to go that route. The dts chips that causes the no sound fault in these machines gets Nearly 80c but not as hot as the big chip to its left, I think this is referred to as the Bits Chip.
I have plotted all the hot chips sizes and ordered a pile of small heat sinks and a couple of 6" PC fans to fit on the top case to blow air over the board silently. Hopefully, I won't have to get it fixed another time with these mods. I will post a you tube video shortly of the thermal imaging of this board.
 
Steve
lmmcams@gmail.com: Jul 27 01:48AM -0700

Here's a video of before any mods and after only being on for five mins with no the receiver not doing anything other than being on- https://youtu.be/C6QfmmJzWks
Arfa Daily <arfa.daily@ntlworld.com>: Jul 27 01:26AM +0100

On 22/07/2017 15:54, John Robertson wrote:
 
> https://www.wonkeedonkeetools.co.uk/circlip-pliers/what-is-a-circlip/
 
> John :-#)#
 
Interesting. The design in question is the one they call grip rings,and
is the fourth picture up from the bottom. They say that these do not
normally fit in a groove, but the ones on my colleague's fan motors do.
I spoke to him again today. He has actually ordered a bunch of new clips
of the right size, so is now not too bothered about the originals
breaking or flying, but has ordered some new pliers that he thinks will
do them anyway. Just in case anyone thinks that pulling a small fan
apart is not worth the aggro, it turns out that these are fans used on
the bed of a printing machine, and are carefully speed controlled by
external circuitry driven from a tacho generator in the fan. The purpose
is apparently to 'float' the paper as it passes through the machine.
They are a custom designed fan from one of the major fan manufacturers,
and are over £100 each. There are four to a unit, and many units per
machine. So far, all of the ones that he has pulled apart and repaired
have had bad joints on the Hall IC in the tacho generator, and have
worked perfectly after resoldering, cleaning out, and reassembling. The
fans have high quality roller bearings, none of which have shown any
signs of wear so far.
 
Arfa
Arfa Daily <arfa.daily@ntlworld.com>: Jul 27 01:30AM +0100

On 22/07/2017 16:15, Ralph Mowery wrote:
 
> They look similar and seem to do about the same function, but there are
> no holes near the ends.
 
> http://www.ebay.com/bhp/e-clip-tool
 
No. Definitely not E-rings. These are a type of 'conventional' circlip,
but with a slot in each arm to locate the removal tool pins, rather than
holes. Thanks for your input anyway. As ever, all comments / suggestions
appreciated.
 
Arfa
N_Cook <diverse@tcp.co.uk>: Jul 27 09:08AM +0100

On 27/07/2017 01:26, Arfa Daily wrote:
> fans have high quality roller bearings, none of which have shown any
> signs of wear so far.
 
> Arfa
 
Exactly those "grip rings" for jewellers screwdrivers.
Find one that just fails to seat in the gap and twist, so it sits neatly
between the small Cs, and lift off/replace with ring still on the blade.
May need a bit of shim, to lever over the point of a C.
To avoid flying rings, a piece of cotton tied to one of the Cs and
anchored somewhere at the other end
tabbypurr@gmail.com: Jul 26 03:40PM -0700

On Wednesday, 26 July 2017 17:11:48 UTC+1, Jeff Liebermann wrote:
> additives found in modern gasoline is considered most hazardous, but I
> suggest you find something a little less dangerous. Please remember
> that you have only one life to give for this repair project.
 
If I knew where I had some in the shed I'd use it, but certainly not in the house.
 
> Have you tried penetrating oil (Kroil) to break things loose? My
> guess(tm) is you're dealing with well hidden rust.
 
Kroil doesn't seem to be sold here. Other penetrating oils are of course, though I've often used kero for this. WD40 aka white spirit is popular here.
I've no clue where my plusgas cans are, not seen them in a long time. So yes I probably need to buy some. I normally try what I've got first.
 
Right now I'm in downtime, and it may take a while to heal up, so the Berninas will probably have to wait.
 
 
NT
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