sci.electronics.repair - 25 new messages in 8 topics - digest

sci.electronics.repair
http://groups.google.com/group/sci.electronics.repair?hl=en

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Today's topics:

==============================================================================
TOPIC: .02 mm pitch flex print PCB repair
http://groups.google.com/group/sci.electronics.repair/t/c0c9b49a40f732fa?hl=en
==============================================================================

== 1 of 3 ==
Date: Sat, Mar 12 2011 12:23 am
From: "N_Cook"

Michael Kennedy <mikek400@crap.comcast.net> wrote in message
news:VcydncYKZ9ShC-fQnZ2dnUVZ_q6dnZ2d@giganews.com...
> I have a Plasma tv that somehow I managed to partially tear one of the
flexi
> prints. I am not too sure how it happened since I was working on the PSU.
>
> That aside, I think the PSU is fixed, but now the .02 mm pitch flexi print
> is torn..
>
> After doing lots of thinking and researching I think the way to go is
using
> a .02mm pitch zebra strip and connect wires from it to the connector.
>
> Now the question is does such a zebra strip exsist?
>
> Does anyone know where I can find such a zebra strip? Any know products I
> could salvage one from??
>
> I hope to connect wires to the zebra strip and then connect those wires to
> the more reasonable sized .5mm pitch connector.
>
>
>

What are the end points of the ribbon ? eg 2 connectors or connector and
glass ? and does it flex in use? is it microstrip/stripline in structure
with a grounded backplane?

== 2 of 3 ==
Date: Sat, Mar 12 2011 3:24 am
From: "Michael Kennedy"

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:ilfaie$3pr$1@news.eternal-september.org...
> Michael Kennedy <mikek400@crap.comcast.net> wrote in message
> news:VcydncYKZ9ShC-fQnZ2dnUVZ_q6dnZ2d@giganews.com...
>> I have a Plasma tv that somehow I managed to partially tear one of the
> flexi
>> prints. I am not too sure how it happened since I was working on the PSU.
>>
>> That aside, I think the PSU is fixed, but now the .02 mm pitch flexi
>> print
>> is torn..
>>
>> After doing lots of thinking and researching I think the way to go is
> using
>> a .02mm pitch zebra strip and connect wires from it to the connector.
>>
>> Now the question is does such a zebra strip exsist?
>>
>> Does anyone know where I can find such a zebra strip? Any know products I
>> could salvage one from??
>>
>> I hope to connect wires to the zebra strip and then connect those wires
>> to
>> the more reasonable sized .5mm pitch connector.
>>
>>
>>
>
> What are the end points of the ribbon ? eg 2 connectors or connector and
> glass ? and does it flex in use? is it microstrip/stripline in structure
> with a grounded backplane?

Fortunately there is no backplane, so I think we can get away with modified
circuit. I will try to get a picture up on the internet soon.

The cable is directly connected to the glass on one end and has a standard
.5 mm pitch *I think nothing to measure with at the moment* connector.

In the middle just after the tear there is a blob IC attached to the cable.
The cable is then attached to an alunimum plate for security. I was thinking
of taking advantage of this alunimum plate by using it as a surface to mount
a zebra connector..

The cable is curled in a c like shape so I think briding the original
connection is the more dfficult route. I think with a zebra connector and a
pcb soldering the wires from the end connector to the pcb and the applying
pressure to the zebra strip is a very viable solution. There is the perfect
place to mount it on top of that aluminum plate.

Anyhow without pictures this is kind of hard to imagine. I will upload a few
pics..

Thanks for the reply!

Mike

== 3 of 3 ==
Date: Sat, Mar 12 2011 4:26 am
From: "Michael Kennedy"

"Michael Kennedy" <mikek400@crap.comcast.net> wrote in message
news:waadnQx_0evQxebQnZ2dnUVZ_gqdnZ2d@giganews.com...
>
> "N_Cook" <diverse@tcp.co.uk> wrote in message
> news:ilfaie$3pr$1@news.eternal-september.org...
>> Michael Kennedy <mikek400@crap.comcast.net> wrote in message
>> news:VcydncYKZ9ShC-fQnZ2dnUVZ_q6dnZ2d@giganews.com...
>>> I have a Plasma tv that somehow I managed to partially tear one of the
>> flexi
>>> prints. I am not too sure how it happened since I was working on the
>>> PSU.
>>>
>>> That aside, I think the PSU is fixed, but now the .02 mm pitch flexi
>>> print
>>> is torn..
>>>
>>> After doing lots of thinking and researching I think the way to go is
>> using
>>> a .02mm pitch zebra strip and connect wires from it to the connector.
>>>
>>> Now the question is does such a zebra strip exsist?
>>>
>>> Does anyone know where I can find such a zebra strip? Any know products
>>> I
>>> could salvage one from??
>>>
>>> I hope to connect wires to the zebra strip and then connect those wires
>>> to
>>> the more reasonable sized .5mm pitch connector.
>>>
>>>
>>>
>>
>> What are the end points of the ribbon ? eg 2 connectors or connector and
>> glass ? and does it flex in use? is it microstrip/stripline in structure
>> with a grounded backplane?
>
>
> Fortunately there is no backplane, so I think we can get away with
> modified circuit. I will try to get a picture up on the internet soon.
>
> The cable is directly connected to the glass on one end and has a standard
> .5 mm pitch *I think nothing to measure with at the moment* connector.
>
>
> In the middle just after the tear there is a blob IC attached to the
> cable. The cable is then attached to an alunimum plate for security. I was
> thinking of taking advantage of this alunimum plate by using it as a
> surface to mount a zebra connector..
>
> The cable is curled in a c like shape so I think briding the original
> connection is the more dfficult route. I think with a zebra connector and
> a pcb soldering the wires from the end connector to the pcb and the
> applying pressure to the zebra strip is a very viable solution. There is
> the perfect place to mount it on top of that aluminum plate.
>
> Anyhow without pictures this is kind of hard to imagine. I will upload a
> few pics..
>
> Thanks for the reply!
>
> Mike
>

I wonder if there are any LCD displays using such small pitch connections
which I could salavage a pcb and zebra strip from..

==============================================================================
TOPIC: Marshall JCM 2000, 1998
http://groups.google.com/group/sci.electronics.repair/t/3338dc78a01d3b6d?hl=en
==============================================================================

== 1 of 4 ==
Date: Sat, Mar 12 2011 2:25 am
From: "Gareth Magennis"

"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:_Bsep.85966$2t5.76413@newsfe24.ams2...
>
>
> "Gareth Magennis" <sound.service@btconnect.com> wrote in message
> news:Zmqep.46314$%e2.36889@newsfe13.ams2...
>>
>>
>> "Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
>> news:vvmep.61518$BQ7.34172@newsfe22.ams2...
>>>
>>>
>>> "N_Cook" <diverse@tcp.co.uk> wrote in message
>>> news:ilcnm8$t7n$1@news.eternal-september.org...
>>>> seconf attempt
>>>>
>>>> Gareth Magennis <sound.service@btconnect.com> wrote in message
>>>> news:2edep.106250$ts7.49007@newsfe14.ams2...
>>>>>
>>>>>
>>>>> "N_Cook" <diverse@tcp.co.uk> wrote in message
>>>>> news:ilas70$gc9$1@news.eternal-september.org...
>>>>> > Arfa Daily <arfa.daily@ntlworld.com> wrote in message
>>>>> > news:rZ5ep.75494$To7.65089@newsfe12.ams2...
>>>>> >>
>>>>> >>
>>>>> >> "N_Cook" <diverse@tcp.co.uk> wrote in message
>>>>> >> news:ilan3u$j8g$1@news.eternal-september.org...
>>>>> >> > Blown primary of the mains Tx, isolated removed from chassis,
>>>>> >> > draws
>>>> 1.2
>>>>> >> > amp
>>>>> >> > at 20V variac "mains" and temp climbs 20 deg C in 4 minutes or
>>>>> >> > so.
>>>>> >> > Secondaries measure l27V, 16.3V and 2V so that side presumably
>>>>> >> > ok.
>>>>> >> > DC of primaries measure 1.2R and 2.2R, would they use 2 bifilar
>>>> primary
>>>>> >> > windings where stressed midpoint would show half way short and
>>>>> >> > half
>>>>> >> > measured
>>>>> >> > ohms?. I will poke around in the winding/ try delaminating out of
>>>>> >> > curiosity
>>>>> >> > but
>>>>> >> > stock fault/ batch fault ? Other than "marinating" in paint
>>>>> >> > stripper
>>>> ,
>>>>> > any
>>>>> >> > tips on delaminating ?
>>>>> >> > Are replacements available from Marshall ? or a grey market
>>>>> >> > source UK
>>>> ?
>>>>> > or
>>>>> >> > anyone use 2 or 3 separate Tx ? Googling Tx model
>>>>> >> > Dagnall, TXMA 00061, D2105
>>>>> >> > only shows up suspiciously low priced dollar quotes
>>>>> >> >
>>>>> >> >
>>>>> >>
>>>>> >> We get parts direct from Marshall. Used to be a Marshall dealer,
>>>>> >> but we
>>>>> > are
>>>>> >> not any more, and they still supply us with parts ok, so it must
>>>>> >> not be
>>>> a
>>>>> >> requirement. It may be that you have to be a 'legitimate' business
>>>>> >> though,
>>>>> >> and not just 'Joe Punter'.
>>>>> >>
>>>>> >> Arfa
>>>>> >>
>>>>> >
>>>>> >
>>>>> > Any ball-park idea of cost for a Marshall replacement ?
>>>>> >
>>>>> >
>>>>>
>>>>>
>>>>>
>>>>> Ball park between ï¿½20 and ï¿½30 inc P&P and VAT.
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> Did you leave out some zeros? 200 to 300 GBP
>>>> eg
>>>> http://www.sowter.co.uk/acatalog/SOWTER_TRANSFORMERS_CLASSIC_AMPS_15.html
>>>>
>>>>
>>>
>>> I wouldn't have thought so. I would have said that Gareth's estimate was
>>> probably not far short of the mark, based on transformers that we've
>>> ordered from them in the past. I've always found them pretty reasonable.
>>> Just give them a call and ask. They're a friendly enough 'family'
>>> company. Jim Marshall's daughter did run spares. As far as I know, she
>>> still does.
>>>
>>> Arfa
>>
>>
>> Is that George, Arfa?
>>
>>
>>
>> Gareth.
>
> Indeed it is ! :-)
>
> They're quite close to where I live.
>
> Arfa

Had no idea she was part of the family!

Marshall are top of my list for spares supply and pricing, and George is
great to deal with and knows her stuff.

Gareth.

== 2 of 4 ==
Date: Sat, Mar 12 2011 3:15 am
From: "Arfa Daily"

>>>
>>>
>>> Is that George, Arfa?
>>>
>>>
>>>
>>> Gareth.
>>
>> Indeed it is ! :-)
>>
>> They're quite close to where I live.
>>
>> Arfa
>
>
>
> Had no idea she was part of the family!
>
> Marshall are top of my list for spares supply and pricing, and George is
> great to deal with and knows her stuff.
>
>
> Gareth.

I've always found them very good - except when they are on stock-take !
Then, you can wait a couple of weeks for your parts ... But yes, in general,
anything you need, and very reasonably priced.

The one problem that I have got with them, is that dreadful system of
providing access to their service information. I actually find it difficult
to use, and to search, and on several occasions, have 'caught them out' with
sections of schematic that simply aren't on there. I'm sure they thought it
was a good idea to have their service info archive 'front ended' by that
Image Bank user interface, and then to give access only to registered
(=pre-approved by their service department) users, but every time I go there
to download a manual, I just find it an awkward and frustrating process.

A long time ago, I found another Marshall specialist site, and they have an
archive of pretty much everything that Marshall have ever produced, right
back to the start, arranged by 'class' and date. I always go there first to
look for service info, and treat Marshall's Image Bank as a port of last
resort. I wish, if they are basically happy to let people have service info,
they would just list everything, and let you get it on a one-click download,
as other manufacturers do. I can sort of understand that they would prefer
to have some control over who they are giving data out to in order to try to
preserve a degree of professionalism in repairs to their equipment, but
given the fact that they must know that info on every one of their products
is already out there for download by the determined searcher, it just seems
a bit 'prissy' of them to force this poorly designed service info search and
download software on their registered users. They could still restrict
registered users to a password protected area on the website, that gave
access to a simple list of all the manuals available.

Arfa

== 3 of 4 ==
Date: Sat, Mar 12 2011 7:33 am
From: "N_Cook"

Normal single filament winding. Normal failure mode , for slapdash wound Tx
these days. Slipped turn at one end of a layer dropping into a lower layer,
then presumably chaffing of lacquer to marginally spot weld. Not at all
obvious "weld" point , about 80 turns from lead out of outer primary. 195
turns in all of .75mm wire for one 120V primary. Not a problem here as 240 V
use, but would be for this Tx used in USA . There is tape covering the inner
primary but not extended at the leadout point of the inner primary so first
turn of the outer primary directly crosses that point so a full short is
very likely there with a bit of normal in service vibration/ chaffing. For
240V use those 2 points are at near enough same mid-mains potential (2 tails
to options bridging point on pcb)
At least I now know how to delaminate the E/I iron laminations.

== 4 of 4 ==
Date: Sat, Mar 12 2011 3:02 pm
From: "Phil Allison"

"Nutcase Kook"
>
> Normal single filament winding. Normal failure mode , for slapdash wound
> Tx
> these days. Slipped turn at one end of a layer dropping into a lower
> layer,
> then presumably chaffing of lacquer to marginally spot weld.
>
> Not at all
> obvious "weld" point , about 80 turns from lead out of outer primary. 195
> turns in all of .75mm wire for one 120V primary. Not a problem here as 240
> V
> use, but would be for this Tx used in USA . There is tape covering the
> inner
> primary but not extended at the leadout point of the inner primary so
> first
> turn of the outer primary directly crosses that point so a full short is
> very likely there with a bit of normal in service vibration/ chaffing.

** The turns wound on that transformer do no move or chaff - you wanker.

Those Dagnall power transformers ( TMXA00061 etc) are made with low temp
grade enamel coating the copper and the tranny is under sized for the job it
has to do - not to mention working in a very high ambient temp from the heat
of the output valves.

As a result the windings run DAMN hot, the enamel gets soft and when two
soft spots meet under pressure you can get a short.

I have THREE dead ( internally shorted) examples of the exact same tranny
sitting here right now.

.... Phil

==============================================================================
TOPIC: JTAG/Boundary Scan
http://groups.google.com/group/sci.electronics.repair/t/0bd7b46a47b4c9bc?hl=en
==============================================================================

== 1 of 3 ==
Date: Sat, Mar 12 2011 6:10 am
From: "Michael A. Terrell"

Dave Platt wrote:
>
> In article <Xqednch4f4U7OufQnZ2dnUVZ_jCdnZ2d@earthlink.com>,
> Michael A. Terrell <mike.terrell@earthlink.net> wrote:
>
> > How do you propose using the programming interface to troubleshoot
> >something? Are you going to write custom software and reprogram the
> >processor? What software and interface do you have, and is it
> >appropriate for the CPU involved? I programmed various embedded
> >controller boards for four years with JTAG, but there was no way to
> >troubleshoot the board from that port. Boundary scan is for testing the
> >CPU, not the rest of the board.
>
> Hunh?
>
> JTAG was originally designed to be a board-checkout feature! It
> allows you to chain together any number of digital devices and probe
> them, read their input pins, write values to their output pins, etc.
>
> As the Great Source of Dubious Knowledge (Wikipedia) states, "It was
> initially devised for testing printed circuit boards using boundary
> scan and is still widely used for this application."
>
> Its use as a method of programming the on-board (or external) flash
> memory for a microcontroller is only one of its functions... a very
> common one but not necessarily its most important.
>
> With many processors, it's possible to access the on-chip debug-and-
> trace engine - stop the processor, single-step it, read out the
> registers or modify them, etc.
>
> It's very much up to a board designer (and to the designers of the
> chips being used) to decide how much functionality is going to be
> exposed via JTAG. On some boards, accessing/programming the flash may
> be all that's possible. On others, you may be able to individually
> interrogate and exercise every single I/O pin on every outward-facing
> chip on the whole board.

How is it going to help troubleshoot the analog portions of a board?
Or a faulty on board voltage regulator? Have you personally ever used
it to fix a bad circuit board?

--
You can't fix stupid. You can't even put a Band-Aid� on it, because it's
Teflon coated.

== 2 of 3 ==
Date: Sat, Mar 12 2011 2:05 pm
From: "Charles"

"Charles" wrote in message news:ile792$ksh$1@news.eternal-september.org...

Has anyone ever used this method for field troubleshooting?

Hey Dave Platt and D Yuniskis ... thanks!

Seems that the promise of JTAG for field service has fallen by the wayside,
for troubleshooting and repair at least. It is used for firmware upgrades.
Economics rule!

== 3 of 3 ==
Date: Sat, Mar 12 2011 4:14 pm
From: "Michael A. Terrell"

Charles wrote:
>
> "Charles" wrote in message news:ile792$ksh$1@news.eternal-september.org...
>
> Has anyone ever used this method for field troubleshooting?
>
> Hey Dave Platt and D Yuniskis ... thanks!
>
> Seems that the promise of JTAG for field service has fallen by the wayside,
> for troubleshooting and repair at least. It is used for firmware upgrades.
> Economics rule!

I see that no one bit on your duplicate post on
news:sci.electronics.design

Most designs don't have enough spare flash for any diagnostics. It
isn't worth the trouble for anything outside a factory where an
automated test fixture can test the entire board without being
reprogrammed. Not what you want to hear, but it's the truth. The
'boundary' stops at the I/O pins where it was intended to. It was a way
to test a complex processor with limited tools, not an entire board.

--
You can't fix stupid. You can't even put a Band-Aid� on it, because it's
Teflon coated.

==============================================================================
TOPIC: Lady Veteran has actually sent me a video of herself
http://groups.google.com/group/sci.electronics.repair/t/e5c475e0c3dc202a?hl=en
==============================================================================

== 1 of 4 ==
Date: Sat, Mar 12 2011 7:02 am
From: Bob Villa

On Mar 11, 9:55 am, Michael Gross <pigwigg...@yahoo.com> wrote:
> Lady Veteran wrote:
> > On Thu, 10 Mar 2011 13:21:49 -0800, HumBug! <KnewsKg...@gmail.com>
> > wrote:
>
> >> On Thu, 10 Mar 2011 10:25:18 +0000, Michael Gross <pigwigg...@yahoo.com>
> >> wrote:
>
> >>> She's talking shit to me so I thought I would forward it
>
> >>>http://www.youtube.com/watch?v=rNjbXg2mBsQ
> >> WRONG one, you sent yourself.
>
> > You know how these idiots are-they don't know the difference between
> > up or down.
>
> > LV
>
> You want to know what else Lady Veteran told me? She told me that when
> she goes to a gym, she gets her workout watching the women in the locker
> room.

Sounds like you're as sick as her!

== 2 of 4 ==
Date: Sat, Mar 12 2011 10:35 am
From: Lady Veteran

On Sat, 12 Mar 2011 07:02:22 -0800 (PST), Bob Villa
<pheeh.zero@gmail.com> wrote:

>On Mar 11, 9:55�am, Michael Gross <pigwigg...@yahoo.com> wrote:
>> Lady Veteran wrote:
>> > On Thu, 10 Mar 2011 13:21:49 -0800, HumBug! <KnewsKg...@gmail.com>
>> > wrote:
>>
>> >> On Thu, 10 Mar 2011 10:25:18 +0000, Michael Gross <pigwigg...@yahoo.com>
>> >> wrote:
>>
>> >>> She's talking shit to me so I thought I would forward it
>>
>> >>>http://www.youtube.com/watch?v=rNjbXg2mBsQ
>> >> WRONG one, you sent yourself.
>>
>> > You know how these idiots are-they don't know the difference between
>> > up or down.
>>
>> > LV
>>
>> You want to know what else Lady Veteran told me? She told me that when
>> she goes to a gym, she gets her workout watching the women in the locker
>> room.
>
>Sounds like you're as sick as her!

Sounds like you both are idiots. Any limp dick can call (or spread
innuendo about) a strong woman being a lesbian, but it only show how
intimidated they are and how obsessed they are about their erectile
dysfunction.

The truth has never passed your lips and I think you should choke and
die if it did, so accustomed you are to LYING>

"I rode a tank and held a general's rank
When the blitzkrieg raged and the bodies stank."

---Sympathy for the Devil-The Rolling Stones
--------------------------------------------

"Only a male compensating for his impotence
would accuse a strong woman of being a lesbian."

---Unknown
----------------------------------------------

"It's a sign of your own worth sometimes if you are
hated by the right people."

---Miles Franklin
----------------------------------------------

See the latest idiot featured on my blog!

My Blog http://ladyveteranslog.blogspot.com
---------------------------------------------
Are you being harassed on Usenet and want to fight
back instead of leaving the net? Are you willing to
stand up to Internet bullies and stalkers?

Join my group http://groups.yahoo.com/group/antiCHU
----------------------------------------------

== 3 of 4 ==
Date: Sat, Mar 12 2011 10:43 am
From: heckmate

Warning! Always wear ANSI approved safety goggles when reading posts by
Checkmate. Oh, yeah... I should also mention that Lady Veteran said the
following:
>
> On Sat, 12 Mar 2011 07:02:22 -0800 (PST), Bob Villa
> <pheeh.zero@gmail.com> wrote:
>
> >On Mar 11, 9:55�am, Michael Gross <pigwigg...@yahoo.com> wrote:
> >> Lady Veteran wrote:
> >> > On Thu, 10 Mar 2011 13:21:49 -0800, HumBug! <KnewsKg...@gmail.com>
> >> > wrote:
> >>
> >> >> On Thu, 10 Mar 2011 10:25:18 +0000, Michael Gross <pigwigg...@yahoo.com>
> >> >> wrote:
> >>
> >> >>> She's talking shit to me so I thought I would forward it
> >>
> >> >>>http://www.youtube.com/watch?v=rNjbXg2mBsQ
> >> >> WRONG one, you sent yourself.
> >>
> >> > You know how these idiots are-they don't know the difference between
> >> > up or down.
> >>
> >> > LV
> >>
> >> You want to know what else Lady Veteran told me? She told me that when
> >> she goes to a gym, she gets her workout watching the women in the locker
> >> room.
> >
> >Sounds like you're as sick as her!
>
> Sounds like you both are idiots. Any limp dick can call (or spread
> innuendo about) a strong woman being a lesbian, but it only show how
> intimidated they are and how obsessed they are about their erectile
> dysfunction.
>
> The truth has never passed your lips and I think you should choke and
> die if it did, so accustomed you are to LYING>
>
> LV

Why didn't you just tell him to suck your dick, Blobbi?

--
Checkmate
Copyright � 2011
all rights reserved

Read what others are saying about Checkmate!
____________________________________________________________________

"You have got to be the biggest butt fucking moron in this place.
You use socks and then admit to it? What the fuck is the point?"

-Wildhare
____________________________________________________________________

"You can sit there all you want and spit out all the denial you can
muster, it still doesn't change the fact that you are the current
king shit of the puppeteers in this group."

-Ragnar
____________________________________________________________________

"It's pretty obvious that if I'm such a dumbass then you are a
double dumbass"

-Ragnar
____________________________________________________________________

"The only thing you want to hold against me is your dong."

-Ragnar shares his latest homoerotic fantasy about me
____________________________________________________________________

== 4 of 4 ==
Date: Sat, Mar 12 2011 2:09 pm
From: "Harvey Daye, Jr"

Lady Veteran wrote:

>
> Sounds like you both are idiots. Any limp dick can call (or spread
> innuendo about) a strong woman being a lesbian, but it only show how
> intimidated they are and how obsessed they are about their erectile
> dysfunction.
>

But the truth is you are a lesbian, and you even said so yourself.

So whenever somebody tells the truth they are obsessed with their
erectile dysfunction?

So what if I say that Mohammad was pedophile does that also mean that
I'm obsessed with "my erectile dysfunction?"

> The truth has never passed your lips and I think you should choke and
> die if it did, so accustomed you are to LYING>
>
> LV
>

==============================================================================
TOPIC: 1.250" dia speaker
http://groups.google.com/group/sci.electronics.repair/t/5dfae7373796a9e5?hl=en
==============================================================================

== 1 of 4 ==
Date: Sat, Mar 12 2011 12:55 pm
From: David Nebenzahl

On 3/10/2011 2:16 PM JR North spake thus:

> So, my Uniden cordless handsets are 5 years old, been dropped TMT. The
> ringer speakers are kaput. They are regular cone type, 1.250" dia. Any
> Suggestions for source? Rat Shack-no go. Google is worthless.

Radio Shack? You must be joking! Try a real electronics vendor.

Digi-Key, f'rinstance, shows a bunch of little bitty speakers in their
catalog. Like a "miniature monitor speaker", 32mm square, p/n
102-1302-ND. (Dunno if this'll work, being square instead of round, but
they may have others of that size. You can search their online catalog
at http://www.digikey.com.)

--
The phrase "jump the shark" itself jumped the shark about a decade ago.

- Usenet

== 2 of 4 ==
Date: Sat, Mar 12 2011 1:15 pm
From: Evan Platt

On Thu, 10 Mar 2011 15:40:56 -0800, "William Sommerwerck"
<grizzledgeezer@comcast.net> wrote:

>Uniden is legally obliged to provide service parts.

Since when? Certainly if they are, there's a time limit - ie 1 year
after model is discontinued.

>If they refuse, there's nothing much you can do about it, but I'd at least bend their ear. Hard.

So wait - they're legally obliged but there's nothing you can do if
they don't? Doesn't make sense.
--
To reply via e-mail, remove The Obvious and .invalid from my e-mail address.

== 3 of 4 ==
Date: Sat, Mar 12 2011 1:15 pm
From: Evan Platt

On Thu, 10 Mar 2011 14:16:10 -0800, JR North
<junkjasonrnorth@bigfoot.com> wrote:

>So, my Uniden cordless handsets are 5 years old, been dropped TMT. The
>ringer speakers are kaput. They are regular cone type, 1.250" dia. Any
>Suggestions for source? Rat Shack-no go. Google is worthless.
>JR

Try mouser.com .
--
To reply via e-mail, remove The Obvious and .invalid from my e-mail address.

== 4 of 4 ==
Date: Sat, Mar 12 2011 1:35 pm
From: "William Sommerwerck"

>> Uniden is legally obliged to provide service parts.

> Since when? Certainly if they are, there's a time limit --
> eg, 1 year after a model is discontinued.

Since a long time ago. It used to be 3 years for cosmetic/trim parts, 5
years for mechanical parts, 10 years for electrical/electronic components.
The laws appear to have been weakened, and no one seems interested in
enforcing them.

>> If they refuse, there's nothing much you can do about it,
>> but I'd at least bend their ear. Hard.

> So wait - they're legally obliged but there's nothing you can
> do if they don't? Doesn't make sense.

It makes perfect sense, if it costs too much money to drag them into court.

Laws are effective only to the extent that people or businesses are willing
to obey them, and governments to enforce them.

Call Uniden. Tell them that if they don't supply a replacement at a
reasonable cost, you'll toss the phones in the trash, and will never buy
Uniden products again.

==============================================================================
TOPIC: What is the difference between scanning for stations and going directly
to one?
http://groups.google.com/group/sci.electronics.repair/t/5606a0580a8be0ca?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Mar 12 2011 1:31 pm
From: mm

On Fri, 11 Mar 2011 10:03:30 -0800, "William Sommerwerck"
<grizzledgeezer@comcast.net> wrote:

>> I thought that letting a VCR or DVD recorder or TV scan for channels/
>> stations was only to compile a list in advance of channels a device
>> could receive, by checking out every station and noting which had
>> signals.
>
>It is.
>
>> And that pushing 1 3 on the remote would go to channel 13 whether one
>> had scanned for stations or not, whether digital station frequencies
>> had changed since the last time one scanned or not. As effectively as
>> if one scanned the whole spectrum, and then channeled up or down to
>> get to 13.
>
>Correct. If you select a channel that hasn't been stored in the set's
>scanning memory, you'll get that channel, whether or not a signal is
>present.
>
>The "go to" is instantaneous. The set does not scan from 2 through 12 before
>hitting 13. The basic principle (I assume) is the same as for any digitally
>tuned receiver -- the LO is directly set to the frequency needed to receive
>channel 13.
>

Aren't you and Arfa disagreeing? Is it different from the UK to the
US?

==============================================================================
TOPIC: HIGH EXPOSE
http://groups.google.com/group/sci.electronics.repair/t/9ef10377e427ee82?hl=en
==============================================================================

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==============================================================================
TOPIC: Dead Sony KV-T25SZ8 TV
http://groups.google.com/group/sci.electronics.repair/t/a211bd1fd48660f2?hl=en
==============================================================================

== 1 of 5 ==
Date: Sat, Mar 12 2011 9:11 pm
From: "Phil Allison"

"Sylvia Else"

>
> The horizontal deflection output transistor measures 5.7 omhs from emitter
> to base in either direction.

** Probably normal.

There is an inbuilt resistor from B to E in nearly all HOTs of 20 ohms or
less.

> It would certainly show as a short on the SMPS output.

** Bollocks.

.... Phil

== 2 of 5 ==
Date: Sat, Mar 12 2011 9:28 pm
From: Clifford Heath

On 03/12/11 22:18, Sylvia Else wrote:
> This TV died abruptly, and completely without warning, while it was
> turned on. It appears completely dead, other than than that the
> degaussing still works.
>
> There was some burning smell evident immediately after it failed, but
> nothing has obviously suffered heat trauma.
>
> Presumably there's a problem with the power supply, which looks like a
> switch-mode. One thing I've noticed is that when power is connected, it
> emits a clicking noise - about three times a second. When the power is
> disconnected, the clicking doesn't stop immediately but continues for
> several seconds, slowing down.
>
> The clicking noise isn't coming from the speakers. I assume it's coming
> from a transformer or choke.

A friend and I (he very experienced) tries to fix a similar fault in a
similar Sony TV a year back. The clicking was coming from a relay in the
PSU, which appears to be driven via some circuitry from an opto-isolator
from the main board. It would appear that it would try to power up, detect
a fault, and shut off again, repeatedly. We never did get to the bottom of
it. Really, with so many rather good glass TVs on the nature strip, are you
sure it's worth the trouble?

Clifford Heath.

== 3 of 5 ==
Date: Sat, Mar 12 2011 9:29 pm
From: Sylvia Else

On 13/03/2011 4:11 PM, Phil Allison wrote:
> "Sylvia Else"
>
>>
>> The horizontal deflection output transistor measures 5.7 omhs from emitter
>> to base in either direction.
>
> ** Probably normal.

Er, yes, I meant emitter to collector.

>
> There is an inbuilt resistor from B to E in nearly all HOTs of 20 ohms or
> less.
>
>> It would certainly show as a short on the SMPS output.
>
> ** Bollocks.

Probably true, for the emitter to base.

I found what appears to be the correct schematic. The transistor's
collector emitter junction is in series with an EHT transformer primary
winding, and together they sit across the HT output from the SMPS, with
just a small inductor in the way. I must admit it doesn't look to me as
if it's performing a horizontal deflection output role - that's just how
the transistor is described in the data sheet.

Sylvia.

== 4 of 5 ==
Date: Sat, Mar 12 2011 9:44 pm
From: Sylvia Else

On 13/03/2011 4:28 PM, Clifford Heath wrote:
> Really, with so many rather good glass TVs on the nature strip, are you
> sure it's worth the trouble?

Probably not, particulary as I've identified a dud transistor that is
moderately expensive to source, and whose failure may only be a symptom.
If the problem had been a failed electrolytic capacitor that I could get
from my local electronics shop, then it would have been worth having a
go at fixing it. As things stand, it's destined for the tip (or
something - see below).

But we don't get good glass TVs on the nature strip, at least not in my
suburb. The council banned getting rid of them that way (i.e. leaving
them out on an official council cleanup day), with the result that one
cannot simply go out on such a day, and pick up a TV whose only sin is
that it isn't wide-screen.

Sylvia.

== 5 of 5 ==
Date: Sat, Mar 12 2011 10:09 pm
From: Clifford Heath

On 03/13/11 16:44, Sylvia Else wrote:
> Probably not, particulary as I've identified a dud transistor that is
> moderately expensive to source,

I replaced the HOT in this TV also. $9 including shipping from WES.
However, HOTs are very strange devices. If you just do the basic
two-diode test, you'll probably consider that a good one has failed.
That's what I did :)... something to keep in mind.

> But we don't get good glass TVs on the nature strip, at least not in my
> suburb.

So drive to the next suburb. Aforementioned friend has picked up
half a dozen perfectly functional TVs that way, usually wide-screen
versions (he prefers those), and provided them to friends. Must get
a few duds, but you can drop those back.

Clifford Heath.

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