sci.electronics.repair - 18 new messages in 9 topics - digest

sci.electronics.repair
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Today's topics:

==============================================================================
TOPIC: Roksan Kandy LIII amp , 2 years old
http://groups.google.com/group/sci.electronics.repair/t/8516ded236e42d84?hl=en
==============================================================================

== 1 of 2 ==
Date: Thurs, Feb 10 2011 1:13 am
From: "N_Cook"

Finder Relays search on www.findernet.com just gives me a useless run around

== 2 of 2 ==
Date: Thurs, Feb 10 2011 3:37 am
From: "N_Cook"

Got the combined phones socket and motorised vol pot board removed now.
Phones uses switched ground contact for cutting speaker output , via relays,
so not a
suspect now. Can see why there are "pot" problems with these amps but not
this one - YET. The PbF soldering on this board looks terrible compared to
main board , no chance of the "green ring" of concave sided volcano mirror
PbF finish here under a 30x . Matt grey crystalline and cracking solder so
the "ring crack" of PbF likely in a few years with normal localised user
induced vibration from using phones or turning the vol knob.

A technical issue - if anyone is up on the matter as twice in one month ,
different makers. I've found PbF solder being used on boards apparently made
from substrate not specified for PbF , or rather the extra temperatures/heat
reached in the soldering process.
From the UL.com E number and type number these amp boards are tin-tinned for
PbF use but the board material is rated 260 deg C/ 8second dwell (270 /10
for PbF , 260/10 for SnPb and 288/8 for polyimide high temp material ) so
lower spec than the already lower spec (8 second dwell time) of traditional
solder formulation boards.

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TOPIC: Strategic Management An Integrated Approach, 9th Edition Hill Test bank
is available for purchase at affordable prices. Contact me at estudyguides[at]
gmail.com to buy it today.
http://groups.google.com/group/sci.electronics.repair/t/b7971de898553c3e?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Feb 10 2011 3:36 am
From: Digital Solutions

Strategic Management An Integrated Approach, 9th Edition Hill Test
bank is available for purchase at affordable prices. Contact me at
estudyguides[at]gmail.com to buy it today.

==============================================================================
TOPIC: Laptop not charging.
http://groups.google.com/group/sci.electronics.repair/t/3f52116e8141f1a4?hl=en
==============================================================================

== 1 of 3 ==
Date: Thurs, Feb 10 2011 4:01 am
From: T i m

On Wed, 09 Feb 2011 09:12:15 -0600, Jim Yanik <jyanik@abuse.gov>
wrote:

>> I was thinking that I only need an old (compatible/ Dell) laptop base
>> / mobo and I've already got a dead battery and I should be able to put
>> something together (in the best Frankenstein stylee). ;-)
>>
>> Assuming these batteries only report 'I'm a Dell battery' rather than
>> "I'm a Dell battery for a Studio 1535 with a pink lid ..."? ;-(
>>
>
>I used to build my own custom extenders (and dummy loads for
>switchers)while at Tektronix. they helped a lot.

Yeah, I used to do similar when a data comms tech. We would bring out
a new range of comms gear but my boss was reluctant to go out and buy
new test kit for it so would get me to design and build all manner of
converters. I enjoyed doing so and it was good to see the other
support guys using it in the field thereafter. ;-)

>Designers just don't make things accessible like they used to.
>or provide useful test points.)

I guess because no human is ever going to test it?
>
>I guess it's part of the "throwaway" culture. :-(

Yup, so it seems and unlikely to change while we seem to be
squandering the worlds recourses as we are today.

Cheers, T i m

p.s. I fid it difficult to throw things away (although I'm not sure
there is such a place as 'away') because even a broken thing contains
parts and materials that may be of use to me at some point. There have
been numerous instances where I have used parts scavenged from
something to repair something else ... some salvaged particularly long
machine screws or switches / whatever.

The 'price' of that flexibility is a house full of 'stuff'.

== 2 of 3 ==
Date: Thurs, Feb 10 2011 8:10 am
From: Jim Yanik

T i m <news@spaced.me.uk> wrote in
news:j9k7l65i00ov3bdptb8cuscvi95athc6ic@4ax.com:

> p.s. I fid it difficult to throw things away (although I'm not sure
> there is such a place as 'away') because even a broken thing contains
> parts and materials that may be of use to me at some point. There have
> been numerous instances where I have used parts scavenged from
> something to repair something else ... some salvaged particularly long
> machine screws or switches / whatever.
>
> The 'price' of that flexibility is a house full of 'stuff'.
>
>

yeah,I'm a packrat too.
every time I "houseclean",a short time later I realize I threw away
something I could have used.

--
Jim Yanik
jyanik
at
localnet
dot com

== 3 of 3 ==
Date: Thurs, Feb 10 2011 11:38 am
From: T i m

On Thu, 10 Feb 2011 10:10:32 -0600, Jim Yanik <jyanik@abuse.gov>
wrote:

>> The 'price' of that flexibility is a house full of 'stuff'.
>>
>>
>
>yeah,I'm a packrat too.
>every time I "houseclean",a short time later I realize I threw away
>something I could have used.

Oh don't.

I was given a micro PC case and stand and did nothing with it for
/years/. Eventually in a fit of tidiness I took the case and it's
stand down the dump. I threw the plastic stand in the plastic
recycling but couldn't bring myself to throw the case.

Two weeks later Mum wanted a PC and I put one together using the
little case. Ideally it would have stood on it's edge on a raised
stand ... ;-(

It's like when beggars come up to you and ask if you have any 'spare
change'. I'm my mind I'm thinking 'I don't know, I haven't finished my
life yet ...' ?

I really thing these TV shows are trying to de-program millions of
years of evolution that has shown that 'stuff' is valuable but maybe
only to those with the skills to use it [1] (and hence today's
trends).

However, this is mainly a 1st world problem as in the 3rd world more
things are used and reused to their fullest. I mean, we even ship our
rubbish there.

Cheers, T i m

[1] And to be fair, the ability to fix stuff even with the tool, LSI
and cars covered in electronics etc.

==============================================================================
TOPIC: Deoxit on "pots"?
http://groups.google.com/group/sci.electronics.repair/t/a3f743a7dd8ff4bf?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Feb 10 2011 4:02 am
From: Smitty Two

In article <bv2b28-2cm.ln1@radagast.org>,
dplatt@radagast.org (Dave Platt) wrote:

> A bit of Googling on the subject of "WD-40 sticky" suggests that the
> problem with stickiness developing, seems to involve use of too-large
> amounts of WD-40 in situations where the lubricated device is exposed
> to significant amounts of dust and dirt in use (e.g. pocket knives,
> hand tools, etc). The residual oil (the nonvolatile part of WD-40) is
> apparently rather viscous, and can be prone to pick up dust/dirt and
> form a sticky sludge under these conditions.

I think it's just the opposite; stickiness developing from using *too
little* WD to flush out the dirt that was there to begin with. For
instance, a common use of the stuff if for locks, and there's a whole
militia of detractors who oppose that quite strongly. Yet in 40 years of
using it on all manner of locks, I've never had one go sticky on me
later. I spray copious amounts in, flushing everything out, then operate
the lock a dozen times, then spray in gobs more. Rinse and repeat.
Cleans and lubricates. More is better. No matter how much you use, only
one layer will remain after the volatiles are gone, so make sure that
layer is squeaky clean to start with.

==============================================================================
TOPIC: Bakelite Asbestos
http://groups.google.com/group/sci.electronics.repair/t/b0be07665d15373b?hl=en
==============================================================================

== 1 of 4 ==
Date: Thurs, Feb 10 2011 4:57 am
From: PeterD

On Thu, 10 Feb 2011 18:15:33 +1100, "Phil Allison" <phil_a@tpg.com.au>
wrote:

>
><vjp2.at@at.BioStrategist.dot.dot.com>
>>
>> By some accounts the original bakelite was up to half asbestos (which
>> kind?
>> WHite or blue?). I saw online some electrical outlets made of bakelite,
>> and I
>> was wondering if it really is bakelite, and if so if there is a new
>> bakelite
>> without asbestos?
>
>
>** Ever heard of Google and Wiki ?
>
>> ANy clues?
>
>
>** Not likely from you.
>
>
>
>.... Phil
>
>
>
>

Damn, took the words out of my mouth...

== 2 of 4 ==
Date: Thurs, Feb 10 2011 9:26 am
From: John Robertson

Unless you are grinding the Bakelite product into a powder and snorting
it I'd not worry about it...

John :-#)#

--
(Please post followups or tech enquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

== 3 of 4 ==
Date: Thurs, Feb 10 2011 6:20 pm
From: Smitty Two

In article <uvKdnefd0I0wgsnQnZ2dnUVZ_hCdnZ2d@giganews.com>,
John Robertson <spam@flippers.com> wrote:

> vjp2.at@at.BioStrategist.dot.dot.com wrote:
> > By some accounts the original bakelite was up to half asbestos (which kind?
> > WHite or blue?). I saw online some electrical outlets made of bakelite, and
> > I
> > was wondering if it really is bakelite, and if so if there is a new
> > bakelite
> > without asbestos? ANy clues?
> >
> >
>
> Unless you are grinding the Bakelite product into a powder and snorting
> it I'd not worry about it...
>
> John :-#)#

The wikipedia article should answer the OPs questions, but I can tell
you that machining phenolics is an easy way to produce snortable powder.
Covers the every square inch of the entire shop with a very fine dust.

== 4 of 4 ==
Date: Thurs, Feb 10 2011 7:17 pm
From: LSMFT

vjp2.at@at.BioStrategist.dot.dot.com wrote:
> By some accounts the original bakelite was up to half asbestos (which kind?
> WHite or blue?). I saw online some electrical outlets made of bakelite, and I
> was wondering if it really is bakelite, and if so if there is a new bakelite
> without asbestos? ANy clues?
>
>
> - = -
> Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
> http://www.panix.com/~vjp2/vasos.htm
> ---{Nothing herein constitutes advice. Everything fully disclaimed.}---
> [Homeland Security means private firearms not lazy obstructive guards]
> [Urb sprawl confounds terror] [Phooey on GUI: Windows for subprime Bimbos]
>
>
>
>
Only worry if it's fluffy bakelite.

==============================================================================
TOPIC: What semiconductor hides behind code H72P?
http://groups.google.com/group/sci.electronics.repair/t/14f42ec4034ae083?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Feb 10 2011 10:01 am
From: "petrus bitbyter"

So I have an SMD semiconductor - most likely a transistor - in a SOT-223
package marked H72P. Found several lists of SMD semicondector codes on the
net but no H72P. Anyone knows what kind of beast I'm dealing with?

petrsu bitbyter

==============================================================================
TOPIC: Nuisance fastners - winge
http://groups.google.com/group/sci.electronics.repair/t/9108d595e22824ac?hl=en
==============================================================================

== 1 of 3 ==
Date: Thurs, Feb 10 2011 1:03 pm
From: "ian field"

"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message
news:kImdnUysPJTguc7QnZ2dnUVZ_tGdnZ2d@earthlink.com...
>
> atec77 wrote:
>>
>> On 10/02/2011 2:05 AM, fritz wrote:
>> >
>> >
>> > Which was ?
>> > Is there a point to this thread apart from the type of screw you
>> > couldn't screw ?
>> >
>> The point is stupid is as stupid does (syliva)
>> the screws are the manufactures way of saying no user serviceable
>> parts do not open
>
>
> It is their lawyer's way of attempting to avoid lawsuits.

Did it work?

== 2 of 3 ==
Date: Thurs, Feb 10 2011 1:11 pm
From: "ian field"

"Sylvia Else" <sylvia@not.here.invalid> wrote in message
news:8rgq9dFodeU1@mid.individual.net...
> On 10/02/2011 11:23 AM, Metro wrote:
>> "Sylvia Else"<sylvia@not.here.invalid> wrote in message
>> news:8rfc4qFt5gU1@mid.individual.net...
>>> I had occasion to dismantle a cheap pedestal fan the other day (Coles
>>> Home
>>> Collection). It hadn't failed, but I wanted to see how it was wired up
>>> (that's another story).
>>>
>>> The cover to the button panel was held in place by four screws which
>>> were
>>> identical except that two were philips head type, and the other two had
>>> a
>>> triangular socket in the head.
>>>
>>> I have bits to cope with most things I've encountered, but not those.
>>> What's the point? Are they worried about competition for repairing these
>>> $10 fans?
>>>
>>> Do consumers regularly electrocute themselves by taking fans apart
>>> without
>>> knowing what they're doing?
>>>
>>> Sylvia.
>>>
>> They are only a tamperproof head of which there are various and easily
>> available.. Wait until you come across a coffin head screw.I believe the
>> reason for using them is that some countries prevent the dismantle of an
>> appliance without the use of a tool or special tool so this way all
>> fields
>> are covered in one assembly. Did you find out how it worked. They are
>> made
>> to break. Best way to keep them longer is to keep the Blades clean and
>> lubricate the bearings NOT with WD40 or the like.
>
> As I said, it hadn't broken. I was actually trying to figure out which
> wire was which leading to the induction motor. I had in mind making it run
> backwards. Aerofoils don't perform as well backwards, but they do perform.
> However, on further consideration I realised that the fan blades would be
> aerodynamically stalled if the fan ran backwards, with the result that it
> would probably not work much at all.

If the fan is symetrical - snap off pairs of opposing blades.

Doesn't matter if there's only 6 to start with - some helicopters have
"scissor" tail rotors.

== 3 of 3 ==
Date: Thurs, Feb 10 2011 2:37 pm
From: "Michael A. Terrell"

ian field wrote:
>
> "Michael A. Terrell" ?mike.terrell@earthlink.net? wrote in message
> news:kImdnUysPJTguc7QnZ2dnUVZ_tGdnZ2d@earthlink.com...
> ?
> ? atec77 wrote:
> ??
> ?? On 10/02/2011 2:05 AM, fritz wrote:
> ?? ?
> ?? ?
> ?? ? Which was ?
> ?? ? Is there a point to this thread apart from the type of screw you
> ?? ? couldn't screw ?
> ?? ?
> ?? The point is stupid is as stupid does (syliva)
> ?? the screws are the manufactures way of saying no user serviceable
> ?? parts do not open
> ?
> ?
> ? It is their lawyer's way of attempting to avoid lawsuits.
>
> Did it work?

Did you sue them?

--
You can't fix stupid. You can't even put a band-aid on it, because it's
Teflon coated.

==============================================================================
TOPIC: Intel "asked" to sell faulty chips
http://groups.google.com/group/sci.electronics.repair/t/cf4be05bbe67d3b2?hl=en
==============================================================================

== 1 of 2 ==
Date: Thurs, Feb 10 2011 1:12 pm
From: whit3rd

On Feb 8, 10:26 pm, Fred <nob...@home.com> wrote:
> bob urz <so...@inetnebr.com> wrote innews:iis2nv$2kn$1@speranza.aioe.org:
>
> >http://www.mbtmag.com/Content.aspx?id=1986
>
> "Computers can be designed in a way that avoids the problem."
>
> Yeah, only buy ones that have AMD processors...hee hee.

Read the full article, it says the problem is in a support chip that
has 7 SATA ports, in that five of 'em age and degrade. If your
chip goes in a laptop with two or fewer SATA devices, it's
just an issue of wiring to the ports that don't have any known
faults. The folk who were expecting their chipsets for
a production schedule care more about promptness than
about the unused features that are at fault.

There's nothing unsound about using the batches without
the fix, in something like a MacBook Air (only ONE SATA device).

== 2 of 2 ==
Date: Thurs, Feb 10 2011 1:34 pm
From: whit3rd

On Feb 9, 10:37 am, Fred <nob...@home.com> wrote:
> Sylvia Else <syl...@not.here.invalid> wrote in news:8rf3f0F340U1
> @mid.individual.net:

> From the FTC manual.....
>
> "The implied warranty of merchantability is a merchant's basic promise
> that the goods sold will do what they are supposed to do
>
> .. about replacing the obviously defective crazing Makrolon
> sunroof (same plastic as DVD). The sun's UV eats it
>... the company lawyers decided it was more economical
> to replace my defective product,... The dealer,
> grudgingly, replaced the roof and charged Penske for it. He wondered
> aloud how I "got away with it", his words.

Oh, go easy on the dealer; he isn't a Penske employee, just a local
guy who has a contract to do the warranty repairs and get Penske
reimbursement. He can't be held liable (it's the manufacturer's
warranty,
he's not the manufacturer), and he can't usefully argue with Penske
either (or he'd jeopardize his contract). You did the right thing
going to the manufacturer.

==============================================================================
TOPIC: Samsung HP-T5064 Service Notes
http://groups.google.com/group/sci.electronics.repair/t/9c4ddba4bee063e9?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Feb 10 2011 1:21 pm
From: "ian field"

"n8ball" <natere2ster@gmail.com> wrote in message
news:922e7573-e1b0-49a8-913c-92abc86b458c@d2g2000yqn.googlegroups.com...
> ok i will ask him about his insurance...i was hoping that he could at
> least turn it on and get an LED error code
> thanks for the advice.
> cheers,
> nate
>
>

Even if you find and fix a straightworward lightning damage fault there may
be latent damage that rears its ugly head after your friend has passed up
the chance of a new one on his insurance.

If he isn't isured he has nothing to lose by letting you have a go.

==============================================================================

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