http://groups.google.com/group/sci.electronics.repair?hl=en
sci.electronics.repair@googlegroups.com
Today's topics:
* Mixing 4 audio channels to 3? - 6 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/a9c921002b2ed750?hl=en
* JESUS IN THE QURAN !!!!!!!!!!!!!! - 3 messages, 3 authors
http://groups.google.com/group/sci.electronics.repair/t/b742ebcfed4ba1d2?hl=en
* Hacking APC UPS's "Master/Controlled" Feature? - 3 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/97c4786ede874ee6?hl=en
* Any TV experts here? - 5 messages, 4 authors
http://groups.google.com/group/sci.electronics.repair/t/ad793e4d0dda11c6?hl=en
* broke my own circuit - 4017 decade/Johnson counter - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/33e2c80674da2af0?hl=en
* Fuse size in IBM ThinkPad T22 wallwart power supply - 5 messages, 5 authors
http://groups.google.com/group/sci.electronics.repair/t/604b8d65c02e3a74?hl=en
* Good sound; intermittent picture. - 2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/45ba5bddf76a0064?hl=en
==============================================================================
TOPIC: Mixing 4 audio channels to 3?
http://groups.google.com/group/sci.electronics.repair/t/a9c921002b2ed750?hl=en
==============================================================================
== 1 of 6 ==
Date: Mon, Oct 31 2011 12:16 am
From: DaveC
> I used an LT1007 in the simulation.
Can't find them on Mouser.
Suggest another one that's good for audio?
How about LM833? ::
<http://www.national.com/ds/LM/LM833.pdf>
The SR and GBW beat the 1007... ;-)
Thanks.
== 2 of 6 ==
Date: Mon, Oct 31 2011 1:11 am
From: DaveC
Is the type of resistor important (wire wound, etc.)?
Thanks.
== 3 of 6 ==
Date: Mon, Oct 31 2011 5:23 am
From: John Fields
On Sun, 30 Oct 2011 21:44:33 -0700, DaveC <invalid@invalid.net> wrote:
>>> Can you suggest a good op amp for such an audio application?
>
>> I used an LT1007 in the simulation.
>>
>> Did you run it?
>
>No tools.
---
They're free:
http://www.linear.com/designtools/software/
---
>I made the L & R op amps fixed gain and added input level control pots:
>
><http://i43.tinypic.com/2hh3y12.jpg>
>
>Comments?
---
Looks OK.
--
JF
== 4 of 6 ==
Date: Mon, Oct 31 2011 5:43 am
From: John Fields
On Sun, 30 Oct 2011 21:47:34 -0700, DaveC <invalid@invalid.net> wrote:
>> <http://i43.tinypic.com/2hh3y12.jpg>
>
>Should all pots be log taper?
---
The input pots, OK. The feedback pot, probably not.
Plot the change in output voltage as a function of wiper position to
get a better handle on it.
--
JF
== 5 of 6 ==
Date: Mon, Oct 31 2011 5:48 am
From: John Fields
On Mon, 31 Oct 2011 00:16:15 -0700, DaveC <invalid@invalid.net> wrote:
>> I used an LT1007 in the simulation.
>
>Can't find them on Mouser.
---
You can buy them directly from Linear:
http://www.linear.com/purchase/LT1007
---
>Suggest another one that's good for audio?
>
>How about LM833? ::
>
><http://www.national.com/ds/LM/LM833.pdf>
>
>The SR and GBW beat the 1007... ;-)
---
Go for it; they're a lot cheaper!
--
JF
== 6 of 6 ==
Date: Mon, Oct 31 2011 5:50 am
From: John Fields
On Mon, 31 Oct 2011 01:11:57 -0700, DaveC <invalid@invalid.net> wrote:
>Is the type of resistor important (wire wound, etc.)?
---
Don't use wirewound.
5% 1/4 watt carbon film is fine.
--
JF
==============================================================================
TOPIC: JESUS IN THE QURAN !!!!!!!!!!!!!!
http://groups.google.com/group/sci.electronics.repair/t/b742ebcfed4ba1d2?hl=en
==============================================================================
== 1 of 3 ==
Date: Mon, Oct 31 2011 4:45 am
From: BV
JESUS IN THE QURAN
The Islamic view of Jesus lies between two extremes. The Jews , who
rejected Jesus as a Prophet of God, called him an impostor. The
Christians, on the other hand, considered him to be the son of God and
worship him as such. Islam considers Jesus to be one of the great
prophets of God and respects him as much as Ibrahim (Abraham), Moses,
and Mohammed. (Peace Be Upon Them) This is conformity with the Islamic
view of the oneness of God, the oneness of Divine guidance, and the
complementary role of the subsequent mission of God's messengers.
The essence of Islam - willing submission to the will of God - was
revealed to Adam, who was passed it on to his children. All following
revelations to Noah, Ibrahim, Moses, Jesus, and finally Mohammed
(Peace Be Upon Them) were conformity with that message, with some
elaboration to define the revelation between man and God, man and man,
man and instructions. Thus, any contradictions among revealed
religions is viewed by Islam as a man-made element introduced into
these religions. The position of Jesus in the three major religions -
Judaism, Christianity, and Islam - should not be an exception.
Although the Quran does not present a detailed life-story of Jesus, it
highlights the important aspects of his birth, his mission, his
ascension to heaven, and passes judgements on the Christian beliefs
concerning him. The Quranic account of Jesus starts with the
conception of his mother, Mary, whose mother, the wife of Imran, vowed
to dedicate her child to the service of God in the temple. When Mary
became a woman, the Holy Spirit (the Archangel Gabriel) appeared to
her as a man bringing her news of a son. We read the following
dialogue in the Quran between Mary and the Angel:
"When the angel said, "Mary, god gives you a good tidings of a Word
from Him whose name is messiah, Jesus, son of Mary, -high honoured
shall he be in this world and the next, near stationed to God. He
shall speak to men in the cradle, and of age, and righteous he shall
be, "lord" said Mary "How shall I have a son, seeing no mortal has
touched me? "Even so, he said "God creates what He will".
When he decrees a thing He but say to it, "Be", and it is. (Al-Imran
3:45-47)
In a chapter (Surah) entitled "Maryam" (Mary), the Quran tells us how
Mary gave birth to her son, and how the Jesus accused her when she
brought the child home:
"Then she brought the child to her folk, carrying him, and they said,
"Mary, you have surely committed a monstrous thing. Sister of Aaron,
your father was not a wicked man, nor your mother a woman unchaste.
Mary pointed to the child; but they said, 'Hoe shall we speak to one
who still in the cradle, a little child. And he said, 'Lo, I am God's
servant, God has given me the Book and made me a Prophet Blessed He
has made me ,wherever/may be; and hi has enjoined me to prayer, and to
give the alms so long as I live, and likewise to cherish my mother; He
has not made me arrogant and wicked. Peace be upon me, the day I was
born, and the day I die, and the day I am raised up a live. "Maryam
19:29-33)
in the same chapter, following the above quotation, God assures
Mohammed (PBUH) and through him the whole world, that what is told
above is the TRUTH about Jesus (PBUH), although Christians might not
accept it. Jesus is NOT the son of God: He was obviously enough, the
son of Mary. The verses continue: "That is Jesus, son of Mary, in word
of truth, concerning which they are doubting. It is not for God to
take a son unto Him. Glory be to Him, He nut says to it, 'Be, and it
is. (Maryam 19:34-35)
After this strong statement about the nature of Jesus, God directed
Mohammed (PBUH) to call the Christians to worship the one God: "Surely
God is my God, and your God, so surely serve him. This is the straight
path". (Maryam 19:36)
The rejection of the very idea of God having a son is restated later
in the same chapter with even stronger words: "And they say, The All-
merciful has taken unto Himself a son. You have indeed advanced
something hideous. As if the skies are about to burst, the earth to
split asunder and its mountain to fall down in the utter ruin for that
they have attributed to the All-merciful a son; and behaves not the
All-merciful to take a son. None there in the heavens and earth but
comes to the All-merciful as a servant" (Maryam 19:88-93)
The Quran recognizes the fact that Jesus had no human father, but this
does not make him the son of God, or God himself. By this criterion,
Adam would have been more entitled more entitled to be the son of God,
because he had neither a father nor a mother, so the Quran draws
attention to the miraculous creation of both in the following verses;
" truly the likeness of Jesus, in God's sight is as Adam's likeness;
He created him of dust, then He said upon him, 'Be' and hi was. (Al-
Imran 3:59)
The Quran rejects the concept of Trinity God the Father, God the son,
God the Holy Spirit - as strongly as it rejects the concept of Jesus
as the son of God. This is because GOD IS ONE. Three cannot be one.
The Quran addresses Christians in the following verses from the Surrah
entitled "An-Nisaa" (The Women)
People of the Book, do not go beyond the bounds in your religion, and
say nought as to God but the Truth. The messiah, Jesus, son of Mary,
was only the messenger of God, and his word (Fulfilment of his word
(Fulfilment of His command, through the word "Be", for the creation of
Jesus) that he committed to Mary, and a spirit originating from Him
(was given life by God). So believe in God and His Messengers, and say
not 'Three'. Refrain, better is for you. God is only one God. Glory be
to him-that He should have a son! To Him belongs all that is in the
Heavens and in the Earth; God suffices for a guardian.
The Messiah will not disdain to be a servant of God, neither the
Angels who are close to Him. Whosoever disdains to serve Him and walks
proud, He will assuredly muster them to Him, all of them.
As for the believers, who do deeds of righteousness, we will pay them
their rewards in full, and He will give them more, of His bounty; as
for them who disdain and walks proud, then He will punish with a
severe punishment, and they shall not find for them, apart from God, a
friend or helper." (An-Nissa 4:171-173)
The denial of Jesus's divinity (and. For the matter, of Mary's
divinity) is presented in the Quran in the form of a dialogue, at the
Day of Judgement, between the Almighty Jesus. All the Messengers and
their nations will gather before God and He will ask the Messengers
how they were received by their people and what they said to them.
Among those who will be questioned is Jesus:
"And when God said, 'O Jesus, son of Mary, did you say unto men, "Take
me and my mother as gods, apart from God"? He said, 'To you be glory!
It is not mine to say what I have no right to. If I indeed said it,
you would have known it, knowing what is within my heart, though I do
not know your knowledge; you know the things unseen. I only said to
them what you did commands me: "Serve God, my God and your God." (Al-
Maida 5-116)
Given that the Quran denies the Trinity and the son ship of Jesus,
what, according to the Quran, was the real mission of Jesus? The
answer is that Jesus was a link in a long chain of Prophets and
Messengers sent by God to various nations and societies whenever they
needed guidance or deviated from his teachings of Moses and other
Messengers. As he was miraculously supported by numerous miracles to
prove that he was a Messengers from God. However, the majority of the
Jews rejected his ministry.
In another verse of the Quran, Jesus confirmed the validity of the
Torah which was revealed to Moses, and also conveyed he glad tidings
of a final Messenger who follow him: "And when Jesus son of Mary said,
'Children of Israel, I am indeed the Messenger to you, confirming the
Torah that is before me, and giving good tiding of a Messenger who
shall be the praised one."(As-Saff 61:6)
Note that "praised one" is a translation of "Ahmad" - The Prophet
Mohammed's name. Careful study of the New Testament shows that Jesus
refers to the same Prophet in John 14:16-17: "And I will give you
another Counsellor (ThProphet Mohammed). To be with you for ever, even
the Spirit of Truth."
The usual explanation of this Prophecy is that the counsellor referred
to is the Holy Spirit, but this explanation is excluded by a previous
verse in John: "Nevertheless I tell you the truth: it is to your
advantage that I go away, for if I do not go away, the Counsellor will
not come to you."
The characteristics of this counsellor, as can be derived from the
prophecy, are that he will stay forever with the believers, he will
glorify Jesus; and he will speak that he hears form God. All four
characteristics apply to the Prophet Mohammed. He came six centuries
after Jesus. He came six centuries after Jesus. He came with a
universal and everlasting message, fulfilling the prophecy that the
counsellor will stay forever with the faithful. He glorified Jesus as
a great Prophet. The Quran attributes to Jesus miracles not mentioned
in the Bible's Old and New Testaments, as well as specific verses in
the Quran show how the Prophet Mohammad is rejected by Jews and
Christians out of prejudice and misunderstanding, rather that
carefully study the Bible.
It is a sad fact of history that not many are following the "straight
path" to which people were called by Jesus. He was only followed by a
few disciples inspired by God to support him. The non-believers
plotted - as they would against Mohammed, six centuries later - to
kill Jesus. But God had better plan for him and his followers, as the
Quran tells us:
"And when Jesus perceived their unbelief, he said 'Who will be my
helpers in the cause of God? The apostles said, 'we are Gods helpers.
We believe in God; so bear witness of our submission God, we believe
in that you have sent down, and we follow the Messenger. Inscribe us
therefore with those who bear witness. 'And they devised, and God
devised, and God devised, and God is the best of divisors. When God
said, 'Jesus, I will take you to Me and will raise you to Me, and I
will purify you (of the falsehoods) of those who do not believe. I
will make your followers above the unbelievers till the Resurrection
Day."(Al-Imran 3:52-55)
As the above verses indicate, Jesus was taken and raised to heaven. He
was not crucified. It was certainly the plan of the enemies of Jesus
to put him to death on the cross, but God saved him and someone else
was crucified:
"And for their unbelief, and their uttering against Mary a grave false
charge, and for their saying, 'We killed the messiah, Jesus son of
Mary, the Messiah of God"…yet they did not slay him, neither crucified
him, only a likeness of that was shown to them. Those who are at
variance concerning him are surely in doubt the following of
conjecture; and they did not kill him of certainty…no indeed; God
raised him up to Him; God is Almighty, Allwise. There is not one of
the people of the book but will assuredly believe him before his
death, and on the Resurrection Day he will be a witness against
them." (An-Nissa 4:156-159)
The Quran does not explain who was the person crucified instead of
Jesus, nor elaborate on the Second Coming of Jesus. However,
explanators of the Quran have always interpreted the last verse of the
above quotation to mean that Jesus will believe in him before he dies.
This understanding is supported by authentic sayings (Hadith) of the
Prophet Mohammed may the peace and blessings of Allah him and upon all
His Messengers.
If you wish to know more about Islam, we prefer to visit
the following websites:
http://www.islamhouse.com/s/9661
http://www.thetruereligion.org
http://www.quran-m.com/firas/en1
http://www.usc.edu/dept/MSA/quran
http://www.quranexplorer.com/quran
http://www.rasoulallah.net/v2/index.aspx?lang=e
http://www.prophetmuhammed.org
http://www.chatislamonline.org/ar
== 2 of 3 ==
Date: Mon, Oct 31 2011 1:50 pm
From: Peter
On Mon, 31 Oct 2011 04:45:06 -0700 (PDT), BV <bv5bv5bv5@yahoo.com>
wrote:
<crud cut>
Yes indeed Jesus is shown in the quaran as a prophet, but the quran
then goes on to 'show' that Jesus is a lying prophet, as the quaran
does not axccept His essential teaching.
So is the quaran factual when it says (amongst other things) that
Jesus is a prophet ... but denies that His prophesies are true.
Wow .... I mean the quaran is either lyiong, or it is untrustworthy.
peter
== 3 of 3 ==
Date: Mon, Oct 31 2011 4:03 pm
From: "Charles"
http://www.irr.org/yamauchi.html
==============================================================================
TOPIC: Hacking APC UPS's "Master/Controlled" Feature?
http://groups.google.com/group/sci.electronics.repair/t/97c4786ede874ee6?hl=en
==============================================================================
== 1 of 3 ==
Date: Mon, Oct 31 2011 1:34 pm
From: Nelson
On Sun, 30 Oct 2011 18:50:54 -0400, PeteCresswell) wrote
(in article <lnkra7h6ef468vlhiifc4vt3kfuloms0nt@4ax.com>):
> I just bought two APC ES 750s.
>
> The feature set touted on the box cites a "Master" outlet that
> controls several "Controlled By Master" outlets.
>
> My expectation was that the "Controlled" outlets would run on
> battery until the "Master" device shut down.
>
> The idea is that we can keep the router/switches working while
> the NAS is on backup, but that they will not drain the battery
> once the NAS shuts down.
>
> Reading other threads, it seems like the "Controlled" outlets are
> not really controlled by the master in the case of power loss:
> they just shut down immediately.
>
> Direct experience confirms this.
>
>
> The Question:
>
> Has anybody hacked one of these things so they actually function
> as advertised? i.e. when power is lost, the devices connected to
> "Controlled By Master" outlets stay powered up until the device
> connected to the "Master" outlet shuts down.
>
> My inner electronic/electrical illiterate is hoping that it might
> be a simple as disconnecting a couple of wires in there and
> re-connecting them to a different place.
>
> Anybody?
>
Your understanding of how it should work is the same as the user
guide's:
> Idle peripheral devices (printer/scanners, speakers) continue to draw power
> when not in use. To conserve power, the Back-UPS uses ³master controlled
> outlets². The Master outlet senses when the master device (computer) that is
> plugged into the Master outlet is no longer drawing current, and
> automatically shuts off power to the Controlled outlets. Pressing the MASTER
> ENABLE button for one second enables and disables this feature. When enabled,
> the green MASTER ENABLE LED is lit (on). When it is disabled, the LED is not
> lit (off). The Back-UPS ships with MASTER ENABLE activated. Note: Do not
> connect peripherals to the Controlled Outlets if you want them to continue to
> run when your computer is turned off.
Perhaps you have inadvertently disabled it? Did you try pushing the
button as mentioned?
You can download a copy of the user guide from the APC site.
--
Nelson
== 2 of 3 ==
Date: Mon, Oct 31 2011 4:50 pm
From: "(PeteCresswell)"
Per Nelson:
>Your understanding of how it should work is the same as the user
>guide's:
>
>> Idle peripheral devices (printer/scanners, speakers) continue to draw power
>> when not in use. To conserve power, the Back-UPS uses ³master controlled
>> outlets². The Master outlet senses when the master device (computer) that is
>> plugged into the Master outlet is no longer drawing current, and
>> automatically shuts off power to the Controlled outlets. Pressing the MASTER
>> ENABLE button for one second enables and disables this feature. When enabled,
>
>> the green MASTER ENABLE LED is lit (on). When it is disabled, the LED is not
>> lit (off). The Back-UPS ships with MASTER ENABLE activated. Note: Do not
>> connect peripherals to the Controlled Outlets if you want them to continue to
>
>> run when your computer is turned off.
>
>Perhaps you have inadvertently disabled it? Did you try pushing the
>button as mentioned?
The lawyers or some other clever souls added weasel words in the
User's Guide | 2 Connect Equipment | Master/Controlled Outlets |
"Note: Do not connect peripherals to the Controlled Outlets if
you want them to continue to run when your computer is turned
off."
For the life of my I can't imagine why they would inflict such a
flawed implementation on their customers. I mean... this is an
Uninterruptible Power Supply, not a friggin power strip... it's
all *about* function when the power fails.
The least they could have done is put that little disclaimer on
the outside of the box.
--
PeteCresswell
== 3 of 3 ==
Date: Mon, Oct 31 2011 4:56 pm
From: "(PeteCresswell)"
Per (PeteCresswell):
>The lawyers or some other clever souls added weasel words in the
>User's Guide | 2 Connect Equipment | Master/Controlled Outlets |
>"Note: Do not connect peripherals to the Controlled Outlets if
>you want them to continue to run when your computer is turned
>off."
>
>For the life of my I can't imagine why they would inflict such a
>flawed implementation on their customers. I mean... this is an
>Uninterruptible Power Supply, not a friggin power strip... it's
>all *about* function when the power fails.
Sorry.... that was a non-sequitur..... I'm so pissed off over
this that I'm not even thinking clearly any more.
But, to answer your question, yes - I have the feature enabled.
It's just that it does not work when the user needs it the most:
when the power fails.
--
PeteCresswell
==============================================================================
TOPIC: Any TV experts here?
http://groups.google.com/group/sci.electronics.repair/t/ad793e4d0dda11c6?hl=en
==============================================================================
== 1 of 5 ==
Date: Mon, Oct 31 2011 3:21 pm
From: ~BD~ <~BD~@nomail.afraid.org>
Any TV experts here?
I'll post my question if there are!
This TV: Sony Bravia KDL 32EX503U
== 2 of 5 ==
Date: Mon, Oct 31 2011 6:37 pm
From: "Arfa Daily"
"~BD~" <~BD~@nomail.afraid.org> wrote in message
news:j8n70p$flg$2@dont-email.me...
> Any TV experts here?
>
> I'll post my question if there are!
>
> This TV: Sony Bravia KDL 32EX503U
There isn't really any such thing, these days. You take a flatscreen TV, and
you do what you can with it, based on experience. A lot of the time, its a
case of going down the manufacturers' preferred route, of board swapping.
That said, power supplies and backlight inverters are often repairable. So
what's the problem ? Good possibility that someone on here might know the
answer, or be able to point you in the right direction. If you never
actually ask the question, you'll never actually know ...
Arfa
== 3 of 5 ==
Date: Mon, Oct 31 2011 7:41 pm
From: bill
On 10/31/2011 3:21 PM, ~BD~ wrote:
> Any TV experts here?
>
> I'll post my question if there are!
>
> This TV: Sony Bravia KDL 32EX503U
I got quite good on repairing Philco 16 inch, black,and white, TVs back
in 1950s
Bill K7NOM
== 4 of 5 ==
Date: Mon, Oct 31 2011 11:32 pm
From: ~BD~ <~BD~@nomail.afraid.org>
~BD~ wrote:
> This TV: Sony Bravia KDL 32EX503U
My thanks to 'Arfa Daily' and 'bill' for comments.
Location: East Devon, England
The TV in question is only 10 months old and apart from the odd
occurrence of digital picture break-up, has worked perfectly until last
Saturday evening when the digital picture broke up into many pieces on
the ITV channels yet remained satisfactory on those from the BBC. My
wife retuned in accordance with the instruction, both auto and manually
but the fault remained.
Yesterday, I reset the TV to factory conditions. I unplugged it from
mains power. I retuned without an aerial input (to clear channel
settings, I'd read on-line) then retuned again.
I now get a perfect picture on all BBC 'normal' channels. I get a
first-class High Definition (HD) picture on relevant channels for both
BBC *and* the commercial TV channels (ITV).
However, I'm still not receiving ITV 'normal' channels at all.
(Another TV we have upstairs *does* work on normal ITV channels!)
There's always a reason for everything. Any idea what might be the cause?
--
Dave - I'll contact our Sony helpline later today and see if they can
help explain matters. I'll report back what transpires.
== 5 of 5 ==
Date: Mon, Oct 31 2011 11:49 pm
From: "Phil Allison"
"~BD~"
> ~BD~ wrote:
>
>> This TV: Sony Bravia KDL 32EX503U
>
> My thanks to 'Arfa Daily' and 'bill' for comments.
>
> Location: East Devon, England
>
> The TV in question is only 10 months old and apart from the odd occurrence
> of digital picture break-up, has worked perfectly until last Saturday
> evening when the digital picture broke up into many pieces on the ITV
> channels yet remained satisfactory on those from the BBC. My wife retuned
> in accordance with the instruction, both auto and manually but the fault
> remained.
>
> Yesterday, I reset the TV to factory conditions. I unplugged it from mains
> power. I retuned without an aerial input (to clear channel settings, I'd
> read on-line) then retuned again.
>
> I now get a perfect picture on all BBC 'normal' channels. I get a
> first-class High Definition (HD) picture on relevant channels for both BBC
> *and* the commercial TV channels (ITV).
>
> However, I'm still not receiving ITV 'normal' channels at all.
>
> (Another TV we have upstairs *does* work on normal ITV channels!)
>
> There's always a reason for everything. Any idea what might be the cause?
** Hardly possible for it to be a fault with the set at all.
Signal strength at the set is low on the ITV channels - hence the breaking
up etc.
Suspect an antenna or cabling problem or possibly one at the transmitter.
That another set in the house works OK is not relevant until you swap the
locations of the sets.
Please describe you antenna and cabling set up - is there a
splitter/booster anywhere ?
... Phil
==============================================================================
TOPIC: broke my own circuit - 4017 decade/Johnson counter
http://groups.google.com/group/sci.electronics.repair/t/33e2c80674da2af0?hl=en
==============================================================================
== 1 of 1 ==
Date: Mon, Oct 31 2011 4:38 pm
From: Sylvia Else
On 27/10/2011 7:12 AM, DewDude wrote:
>
> explain your reasoning or stfu.
That's a spectacularly foolish way of reacting in a newsgroup where
you're seeking help. Even those who are not the target of your response
are likely to take the view that you can go and play in the traffic.
Sylvia.
==============================================================================
TOPIC: Fuse size in IBM ThinkPad T22 wallwart power supply
http://groups.google.com/group/sci.electronics.repair/t/604b8d65c02e3a74?hl=en
==============================================================================
== 1 of 5 ==
Date: Mon, Oct 31 2011 5:34 pm
From: Robert Macy
The power supply that goes to the IBM ThinkPad T22 got wet!
arcing sounds, zsst! does not work now. Internally found a blown
pigtail fuse. plus, [and this does NOT bode well] blackened PCB areas
around AC mains traces.
The pigtail fuse does not appear to be simple physical caps going over
the 8AG type but solidly attached to the metal end caps. Plus, and
this ALWAYS happens, the value is UNDER the fuse body and is not
accessible. I'd like to simply put asimilarly rated fuse in parallel
to check if the problem is only the fuse, but don't know the amperage.
Anybody know the rating? The main unit is in the range of 16V 3.36A
so the fuse could be 1 to 2A, but the wire laying down inside looks
heavier. Maybe the fuse is in series with the output ? and is more
like 5 to 10A ??
Anybody have a manual, or URL to find out?
== 2 of 5 ==
Date: Mon, Oct 31 2011 6:41 pm
From: Jamie
Robert Macy wrote:
> The power supply that goes to the IBM ThinkPad T22 got wet!
>
> arcing sounds, zsst! does not work now. Internally found a blown
> pigtail fuse. plus, [and this does NOT bode well] blackened PCB areas
> around AC mains traces.
>
> The pigtail fuse does not appear to be simple physical caps going over
> the 8AG type but solidly attached to the metal end caps. Plus, and
> this ALWAYS happens, the value is UNDER the fuse body and is not
> accessible. I'd like to simply put asimilarly rated fuse in parallel
> to check if the problem is only the fuse, but don't know the amperage.
>
> Anybody know the rating? The main unit is in the range of 16V 3.36A
> so the fuse could be 1 to 2A, but the wire laying down inside looks
> heavier. Maybe the fuse is in series with the output ? and is more
> like 5 to 10A ??
>
> Anybody have a manual, or URL to find out?
>
Attach a 55 watt incandescent lamp across the open fuse and use that as
the test fuse.
And if you don't understand how that would work for you, you shouldn't
be doing none of this, at all.
Jamie
== 3 of 5 ==
Date: Mon, Oct 31 2011 6:31 pm
From: "Arfa Daily"
"Robert Macy" <robert.a.macy@gmail.com> wrote in message
news:5e6496c4-6564-4753-a3aa-6605b2250857@j20g2000vby.googlegroups.com...
> The power supply that goes to the IBM ThinkPad T22 got wet!
>
> arcing sounds, zsst! does not work now. Internally found a blown
> pigtail fuse. plus, [and this does NOT bode well] blackened PCB areas
> around AC mains traces.
>
> The pigtail fuse does not appear to be simple physical caps going over
> the 8AG type but solidly attached to the metal end caps. Plus, and
> this ALWAYS happens, the value is UNDER the fuse body and is not
> accessible. I'd like to simply put asimilarly rated fuse in parallel
> to check if the problem is only the fuse, but don't know the amperage.
>
> Anybody know the rating? The main unit is in the range of 16V 3.36A
> so the fuse could be 1 to 2A, but the wire laying down inside looks
> heavier. Maybe the fuse is in series with the output ? and is more
> like 5 to 10A ??
>
> Anybody have a manual, or URL to find out?
>
It'll be a switcher. If it got wet, and the input fuse is blown, and the
board is blackened, it can probably be pretty much considered to be beyond
resurrection ...
I'd feel inclined to clean up the blackened bit as best you can, and then
hang a 1 amp fuse across the original. If that immediately blows, it's not
going to be worth wasting more time on.
Arfa
== 4 of 5 ==
Date: Mon, Oct 31 2011 7:28 pm
From: "Michael A. Terrell"
Robert Macy wrote:
>
> The power supply that goes to the IBM ThinkPad T22 got wet!
>
> arcing sounds, zsst! does not work now. Internally found a blown
> pigtail fuse. plus, [and this does NOT bode well] blackened PCB areas
> around AC mains traces.
>
> The pigtail fuse does not appear to be simple physical caps going over
> the 8AG type but solidly attached to the metal end caps. Plus, and
> this ALWAYS happens, the value is UNDER the fuse body and is not
> accessible. I'd like to simply put asimilarly rated fuse in parallel
> to check if the problem is only the fuse, but don't know the amperage.
>
> Anybody know the rating? The main unit is in the range of 16V 3.36A
> so the fuse could be 1 to 2A, but the wire laying down inside looks
> heavier. Maybe the fuse is in series with the output ? and is more
> like 5 to 10A ??
>
> Anybody have a manual, or URL to find out?
You can get new power supply on Ebay for $8.
--
You can't have a sense of humor, if you have no sense.
== 5 of 5 ==
Date: Mon, Oct 31 2011 8:19 pm
From: Jeff Liebermann
On Mon, 31 Oct 2011 17:34:12 -0700 (PDT), Robert Macy
<robert.a.macy@gmail.com> wrote:
>The power supply that goes to the IBM ThinkPad T22 got wet!
I don't think there's a fuse inside. Dry it out as best you can. Give
it about a week or two in a warm area. Then, try it again. Otherwise,
just buy another power supply on eBay.
<http://www.ebay.com/sch/i.html?_nkw=thinkpad+t22+power+supply>
--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558
# http://802.11junk.com jeffl@cruzio.com
# http://www.LearnByDestroying.com AE6KS
==============================================================================
TOPIC: Good sound; intermittent picture.
http://groups.google.com/group/sci.electronics.repair/t/45ba5bddf76a0064?hl=en
==============================================================================
== 1 of 2 ==
Date: Mon, Oct 31 2011 11:54 pm
From: micky
Can a tv input signal connection at the input coax connector affect
only the picture and not the sound??
I have a 25" Sharp TV, CRT, that often loses its picture, but never
the sound. (Other than that, the picture and sound are very good.
It's analog and I only use channel 3 and a separate tuner.)
The picture can be restored by bending the co-ax TV input cable one
way or the other. Sometimes this lasts for days at a couple hours
each day. Other times it lasts for 10 seconds. I have a string
attached to the cable. Usually pulling the string, pulling it
tighter, or letting the string go makes the picture come back. I wrap
the string around a drawer knob on my workbench (beyond which is the
tv)., sort of like roping a calf and tying the lasso to the saddle
pommel. This is the closest I've gotten to being a cowboy.
Is it possible that the problem is the co-ax input cable connector or
some part or connection near to that???? I don't see how a bad
connection that early on can interrupt the picture and have no effect
on the sound.
Or is it just a locational coincidence, and the problem has to be
somewhere in the main circuity, after the sound and picture are
separate????
Or in the high voltage? although I would think if it were the high
voltage, I would see the picture start out small, maybe as a pinpoint,
and enlarge when I pulled on the string and restored the picture.
Instead it just appears on the entire screen at once.
Thanks for any help you can give.
== 2 of 2 ==
Date: Tues, Nov 1 2011 12:24 am
From: "Geoffrey S. Mendelson"
micky wrote:
> The picture can be restored by bending the co-ax TV input cable one
> way or the other. Sometimes this lasts for days at a couple hours
> each day. Other times it lasts for 10 seconds.
Have you tried replacing the coax? It seems to me for a couple of bucks,
you can avoid a lot of effort if it works.
The antenna connector could be loose, or corroded. If you have any DeOxit,
put a drop on the end of a toothpick and clean the center contact of
the antenna socket. If it's an F connector, which is designed for bare
wire as the center contact use something thinner, like a bent paperclip.
Geoff.
--
Geoffrey S. Mendelson, N3OWJ/4X1GM
My high blood pressure medicine reduces my midichlorian count. :-(
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