sci.electronics.repair - 25 new messages in 11 topics - digest

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

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Today's topics:

==============================================================================
TOPIC: SEX IMAGES
http://groups.google.com/group/sci.electronics.repair/t/f53f2b42f7bb63ff?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Feb 17 2011 12:40 am
From: SRAVANTHI LOVE

HOT HOLLYWOOD ACTRESS
http://karomasti9.blogspot.com/2011/02/ferida-pinto.html
DEEPIKA PADUKONE HOT VIDEOS
http://karomasti9.blogspot.com/2011/01/deepika-padukone.html
HOT ARCHANA STILLS
http://karomasti9.blogspot.com/2011/01/archana.html
DEEKSHA SETH HOT WALLPAPERS
http://karomasti9.blogspot.com/2011/01/deeksha-seth.html
KATRINA KAIF HOT VIDEOS&PHOTOS
http://karomasti9.blogspot.com/2011/01/katrina-kaif.html
SAMEERAREDDY HOT BOOBS
http://karomasti9.blogspot.com/2011/01/sameerareddy.html

AMISHAPATEL HOT VIDEOS
http://karomasti9.blogspot.com/search/label/amisha
HANSIKHA HOT SEXY PHOTOS
http://karomasti9.blogspot.com/search/label/HANSIKA

==============================================================================
TOPIC: EDC 521 DC calibrator blowing fuses
http://groups.google.com/group/sci.electronics.repair/t/5fd358d9fe0d0a0c?hl=en
==============================================================================

== 1 of 5 ==
Date: Thurs, Feb 17 2011 2:41 am
From: JW

Here's one I haven't seen before. Bought an EDC (now Krohn-hite) 521 DC
calibrator on the surplus market that was blowing fuses. There were two
power supplies that seemed to be causing the problem +-150V. Turns out
that there were two 22K 2W carbon comp resistors that are used as bleeders
across the two 470uF filter caps. Both had changed resistance - one was
about 2K, the other was 150 ohms! I've seen carbon comps drift, but never
saw ones that drifted *that* far. Also, in circuits like this where they
are dissipating over a watt, they usually drift high; at least in my
experience...

Well, after replacement it seems to be working well. May need a
calibration though.

== 2 of 5 ==
Date: Thurs, Feb 17 2011 4:51 am
From: "N_Cook"

JW <none@dev.null> wrote in message
news:35upl6lr8suad9btcu6jskug49oel94vod@4ax.com...
> Here's one I haven't seen before. Bought an EDC (now Krohn-hite) 521 DC
> calibrator on the surplus market that was blowing fuses. There were two
> power supplies that seemed to be causing the problem +-150V. Turns out
> that there were two 22K 2W carbon comp resistors that are used as bleeders
> across the two 470uF filter caps. Both had changed resistance - one was
> about 2K, the other was 150 ohms! I've seen carbon comps drift, but never
> saw ones that drifted *that* far. Also, in circuits like this where they
> are dissipating over a watt, they usually drift high; at least in my
> experience...
>
> Well, after replacement it seems to be working well. May need a
> calibration though.

If you still have them , try a neat 0.5mm thick Dremmelgrinding disc cut
across the middle and see if there is a gradation of resistance developed
across the material , and so along the length. Just under the surface
coating you may find the high conductivity path.
I keep a "black museum" of such oddities , don't know if anyone else does

== 3 of 5 ==
Date: Thurs, Feb 17 2011 6:14 am
From: Jim Yanik

"N_Cook" <diverse@tcp.co.uk> wrote in
news:ijj5kg$3bn$1@news.eternal-september.org:

> JW <none@dev.null> wrote in message
> news:35upl6lr8suad9btcu6jskug49oel94vod@4ax.com...
>> Here's one I haven't seen before. Bought an EDC (now Krohn-hite) 521
>> DC calibrator on the surplus market that was blowing fuses. There
>> were two power supplies that seemed to be causing the problem +-150V.
>> Turns out that there were two 22K 2W carbon comp resistors that are
>> used as bleeders across the two 470uF filter caps. Both had changed
>> resistance - one was about 2K, the other was 150 ohms! I've seen
>> carbon comps drift, but never saw ones that drifted *that* far. Also,
>> in circuits like this where they are dissipating over a watt, they
>> usually drift high; at least in my experience...
>>
>> Well, after replacement it seems to be working well. May need a
>> calibration though.
>
>
> If you still have them , try a neat 0.5mm thick Dremmelgrinding disc
> cut across the middle and see if there is a gradation of resistance
> developed across the material , and so along the length. Just under
> the surface coating you may find the high conductivity path.
> I keep a "black museum" of such oddities , don't know if anyone else
> does
>
>
>
>
>

I used to see 2W carbon comp resistors change values drastically all the
time in TEK 520 and 520A vectorscopes. I believe it's heat-related.
(it also might depend on how much V drop across them)

They used to char the PCB even with a 1/2" standoff spacing and some even
dropped off the PCB.

--
Jim Yanik
jyanik
at
localnet
dot com

== 4 of 5 ==
Date: Thurs, Feb 17 2011 10:08 am
From: "Wild_Bill"

You might do a dissection, as Nigel suggests, just to see what's in there..
Eyes On can sometimes clear up a lot of mystery.

I have seen old resistors that were a combination of resistance wire and
carbon, but your example could be something else that's interesting.

--
Cheers,
WB
.............

"JW" <none@dev.null> wrote in message
news:35upl6lr8suad9btcu6jskug49oel94vod@4ax.com...
> Here's one I haven't seen before. Bought an EDC (now Krohn-hite) 521 DC
> calibrator on the surplus market that was blowing fuses. There were two
> power supplies that seemed to be causing the problem +-150V. Turns out
> that there were two 22K 2W carbon comp resistors that are used as bleeders
> across the two 470uF filter caps. Both had changed resistance - one was
> about 2K, the other was 150 ohms! I've seen carbon comps drift, but never
> saw ones that drifted *that* far. Also, in circuits like this where they
> are dissipating over a watt, they usually drift high; at least in my
> experience...
>
> Well, after replacement it seems to be working well. May need a
> calibration though.

== 5 of 5 ==
Date: Thurs, Feb 17 2011 4:17 pm
From: Jamie

Jim Yanik wrote:

> "N_Cook" <diverse@tcp.co.uk> wrote in
> news:ijj5kg$3bn$1@news.eternal-september.org:
>
>
>>JW <none@dev.null> wrote in message
>>news:35upl6lr8suad9btcu6jskug49oel94vod@4ax.com...
>>
>>>Here's one I haven't seen before. Bought an EDC (now Krohn-hite) 521
>>>DC calibrator on the surplus market that was blowing fuses. There
>>>were two power supplies that seemed to be causing the problem +-150V.
>>>Turns out that there were two 22K 2W carbon comp resistors that are
>>>used as bleeders across the two 470uF filter caps. Both had changed
>>>resistance - one was about 2K, the other was 150 ohms! I've seen
>>>carbon comps drift, but never saw ones that drifted *that* far. Also,
>>>in circuits like this where they are dissipating over a watt, they
>>>usually drift high; at least in my experience...
>>>
>>>Well, after replacement it seems to be working well. May need a
>>>calibration though.
>>
>>
>>If you still have them , try a neat 0.5mm thick Dremmelgrinding disc
>>cut across the middle and see if there is a gradation of resistance
>>developed across the material , and so along the length. Just under
>>the surface coating you may find the high conductivity path.
>>I keep a "black museum" of such oddities , don't know if anyone else
>>does
>>
>>
>>
>>
>>
>
>
> I used to see 2W carbon comp resistors change values drastically all the
> time in TEK 520 and 520A vectorscopes. I believe it's heat-related.
> (it also might depend on how much V drop across them)
>
> They used to char the PCB even with a 1/2" standoff spacing and some even
> dropped off the PCB.
>
>

Electronics isn't fun unless you have some flames, forehead contact with
debris, and escaping blue smoke!

Jamie

==============================================================================
TOPIC: Tube Amp 6L6GC Valve Peavey Mace VT Guitar Amplifier
http://groups.google.com/group/sci.electronics.repair/t/9ad57064b3ab9e7f?hl=en
==============================================================================

== 1 of 8 ==
Date: Thurs, Feb 17 2011 3:21 am
From: "Phil Allison"

"Fred the Fuckwit "
>
>
> Hmm....I don't think this is a good idea. These amps are built really
> cheap with common cathode bias,

** No they are not.

Strictly grid bias.

You trolling imbecile.

.... Phil

== 2 of 8 ==
Date: Thurs, Feb 17 2011 5:35 am
From: "Arfa Daily"

"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:8s4emqFgqmU1@mid.individual.net...
>
> "Fred the Fuckwit "
>>
>>
>> Hmm....I don't think this is a good idea. These amps are built really
>> cheap with common cathode bias,
>
>
> ** No they are not.
>
> Strictly grid bias.
>
> You trolling imbecile.
>
>
>
>
> .... Phil
>
>
>

I've gotta say that in this case, I agree with Phil. The schematic that I
have for the 6 x 6L6 Peavey output stage, has the cathodes decked, and a
fixed negative 60v bias supply, injected into the grid circuits via a pair
of 220k resistors. This being the case, the bias on the remaining tubes will
not be affected at all by the removal of the other four. Most tube guitar
amps that I come across have the cathodes decked and either a fixed or
adjustable independent bias supply.

Whilst there are some theoretical issues with output tranny impedances and
plate loads, in practice, I would be surprised if it gave any problem
running with just two tubes. Over the years, I have seen many four tube
output stages being run with just two tubes fitted, without a problem.

My biggest concern would be the plate voltage. It appears to be fed directly
from the bridge on the end of the power tx high voltage winding, and is
shown as a nominal 500v. The screen voltage is not far behind it at 490v.
500v is already up at the original design maximum for a 6L6, and 490v on the
screen actually exceeds the quoted maximum of 450v.

It may be that the 500v shown on the schematic is nominal unloaded maximum,
and when it is running with 6 tubes in place, the actual value is lower than
that, in which case, running with just two tubes fitted will not be a
problem. If, however, the 500v is the loaded voltage, then it could rise to
well above the maximum rated plate voltage for the tubes with only two
fitted, which is not good news. If that did turn out to be the case, you
could put a resistor in line either on one leg of the AC input to the
bridge, or immediately after the bridge, to drop the maximum available
voltage. Be aware, however, that it would need to be a beefy resistor to
drop say 50v at a current demand of a couple of hundred mA. Something around
220 ohms at 10 watts maybe. You could always fit a switch across it to put
the supply back up to the full amount, if you refitted all six tubes.

Arfa

== 3 of 8 ==
Date: Thurs, Feb 17 2011 9:46 am
From: Meat Plow

On Thu, 17 Feb 2011 13:35:13 +0000, Arfa Daily wrote:

> "Phil Allison" <phil_a@tpg.com.au> wrote in message
> news:8s4emqFgqmU1@mid.individual.net...
>>
>> "Fred the Fuckwit "
>>>
>>>
>>> Hmm....I don't think this is a good idea. These amps are built really
>>> cheap with common cathode bias,
>>
>>
>> ** No they are not.
>>
>> Strictly grid bias.
>>
>> You trolling imbecile.
>>
>>
>>
>>
>> .... Phil
>>
>>
>>
>>
> I've gotta say that in this case, I agree with Phil. The schematic that
> I have for the 6 x 6L6 Peavey output stage, has the cathodes decked, and
> a fixed negative 60v bias supply, injected into the grid circuits via a
> pair of 220k resistors. This being the case, the bias on the remaining
> tubes will not be affected at all by the removal of the other four. Most
> tube guitar amps that I come across have the cathodes decked and either
> a fixed or adjustable independent bias supply.
>
> Whilst there are some theoretical issues with output tranny impedances
> and plate loads, in practice, I would be surprised if it gave any
> problem running with just two tubes. Over the years, I have seen many
> four tube output stages being run with just two tubes fitted, without a
> problem.
>
> My biggest concern would be the plate voltage. It appears to be fed
> directly from the bridge on the end of the power tx high voltage
> winding, and is shown as a nominal 500v. The screen voltage is not far
> behind it at 490v. 500v is already up at the original design maximum for
> a 6L6, and 490v on the screen actually exceeds the quoted maximum of
> 450v.
>
> It may be that the 500v shown on the schematic is nominal unloaded
> maximum, and when it is running with 6 tubes in place, the actual value
> is lower than that, in which case, running with just two tubes fitted
> will not be a problem. If, however, the 500v is the loaded voltage, then
> it could rise to well above the maximum rated plate voltage for the
> tubes with only two fitted, which is not good news. If that did turn out
> to be the case, you could put a resistor in line either on one leg of
> the AC input to the bridge, or immediately after the bridge, to drop the
> maximum available voltage. Be aware, however, that it would need to be a
> beefy resistor to drop say 50v at a current demand of a couple of
> hundred mA. Something around 220 ohms at 10 watts maybe. You could
> always fit a switch across it to put the supply back up to the full
> amount, if you refitted all six tubes.
>
> Arfa

Could refit with two EL34s. My Musicman 112 combo uses a pair of Mullards
at around 700v plate.

--
Live Fast, Die Young and Leave a Pretty Corpse

== 4 of 8 ==
Date: Thurs, Feb 17 2011 10:02 am
From: "Wild_Bill"

Thanks for the concise reply, Arfa.. I believe your comments will apply to
the particular output stage of the Mace VT series.
I haven't received the amp yet, and wasn't able to find a readily available
schematic online (without extensive searching), but I did find a few others,
and the *Mace A series* uses the same tubes in a 2 x 3 configuration.. so I
was assuming that the power section is the same or very similar (same age,
same output power).

I had also seen the spec sheets for the tubes, and noticed that the voltages
shown in the *Mace A series* schematic would seem to exceed the maximum
specs for the same tubes.
This particular schematic only shows an adjustment pot for the -55V to #5
pins (from a -77V source).

The *Mace A series* schematic I'm looking at shows a difference in wiring
for one tube of each set, where the 100/5W resistor on pin #4 is wired only
to one of each set, and the 100/5W resistor is in series between the two
other sets for pins #4.
I have no idea what this would mean as far as using only 2 tubes for the
output section (but it looks like 2 of the sockets wouldn't be good choices
for only using 2 tubes).
The tubes aren't designated as V1, V2 etc, so I can't be more specific.

I no longer own any tube testers (other than a CR70 for CRTs), but I keep
seeing cautions about the need for matched sets. I've seen quad sets, but
not hex sets, although I'm certain that most sellers would match 6, but I
don't have a tester for an independent check of the existing used tubes.

--
Cheers,
WB
.............

"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:mu97p.56922$LO2.21988@newsfe20.ams2...
>
> I've gotta say that in this case, I agree with Phil. The schematic that I
> have for the 6 x 6L6 Peavey output stage, has the cathodes decked, and a
> fixed negative 60v bias supply, injected into the grid circuits via a pair
> of 220k resistors. This being the case, the bias on the remaining tubes
> will not be affected at all by the removal of the other four. Most tube
> guitar amps that I come across have the cathodes decked and either a fixed
> or adjustable independent bias supply.
>
> Whilst there are some theoretical issues with output tranny impedances and
> plate loads, in practice, I would be surprised if it gave any problem
> running with just two tubes. Over the years, I have seen many four tube
> output stages being run with just two tubes fitted, without a problem.
>
> My biggest concern would be the plate voltage. It appears to be fed
> directly from the bridge on the end of the power tx high voltage winding,
> and is shown as a nominal 500v. The screen voltage is not far behind it at
> 490v. 500v is already up at the original design maximum for a 6L6, and
> 490v on the screen actually exceeds the quoted maximum of 450v.
>
> It may be that the 500v shown on the schematic is nominal unloaded
> maximum, and when it is running with 6 tubes in place, the actual value is
> lower than that, in which case, running with just two tubes fitted will
> not be a problem. If, however, the 500v is the loaded voltage, then it
> could rise to well above the maximum rated plate voltage for the tubes
> with only two fitted, which is not good news. If that did turn out to be
> the case, you could put a resistor in line either on one leg of the AC
> input to the bridge, or immediately after the bridge, to drop the maximum
> available voltage. Be aware, however, that it would need to be a beefy
> resistor to drop say 50v at a current demand of a couple of hundred mA.
> Something around 220 ohms at 10 watts maybe. You could always fit a switch
> across it to put the supply back up to the full amount, if you refitted
> all six tubes.
>
> Arfa

== 5 of 8 ==
Date: Thurs, Feb 17 2011 11:29 am
From: Fred

"Phil Allison" <phil_a@tpg.com.au> wrote in news:8s4emqFgqmU1
@mid.individual.net:

>
> "Fred the Fuckwit "
>>
>>
>> Hmm....I don't think this is a good idea. These amps are built really
>> cheap with common cathode bias,
>
>
> ** No they are not.
>
> Strictly grid bias.
>
> You trolling imbecile.
>
>
>
>
> .... Phil
>
>
>
>

Geez, Phil, asshole....thanks!

Assholes like you is the reason someone who comes here gets no help....

== 6 of 8 ==
Date: Thurs, Feb 17 2011 1:15 pm
From: "Phil Allison"

"Meat Plow"

> Could refit with two EL34s.

** Make any issues worse not better.

> My Musicman 112 combo uses a pair of Mullards
> at around 700v plate.

** And only half that voltage on the screens.

Not relevant at all - fuckhead.

.... Phil

== 7 of 8 ==
Date: Thurs, Feb 17 2011 1:17 pm
From: "Phil Allison"

"Fred" <nobody@home.com>
>> "Fred the Fuckwit "
>>>

** Go away you PITA damn TROLL.

.... Phil

== 8 of 8 ==
Date: Thurs, Feb 17 2011 1:51 pm
From: Meat Plow

On Fri, 18 Feb 2011 08:15:44 +1100, Phil Allison wrote:

> "Meat Plow"
>
>
>> Could refit with two EL34s.
>
> ** Make any issues worse not better.
>
>> My Musicman 112 combo uses a pair of Mullards at around 700v plate.
>
> ** And only half that voltage on the screens.
>
> Not relevant at all - fuckhead.

It's very relevant, Fuckhead. Any moron knows you wouldn't
just drop a pair of EL34s in without some slight modification.
Hell i knew that when I was 15. Problem is you think everyone else is a
moron besides you. I've worked on just about every Peavey tube amp made
clear back to when you still shit in a diaper. Nevermind that you
probably still shit in a diaper.

--
Live Fast, Die Young and Leave a Pretty Corpse

==============================================================================
TOPIC: Radar detector/scrambler
http://groups.google.com/group/sci.electronics.repair/t/646f5661b2cfc1b7?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Feb 17 2011 6:09 am
From: Jim Yanik

Jeff Liebermann <jeffl@cruzio.com> wrote in
news:e8dpl61rq9e2phhlustatkkuhlmtu5eku8@4ax.com:

> Ramsey Radar Gun:
><http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key
>=SG7>
>
>

I used to go to high school with John Ramsey;
he used to make little "wireless microphones".
:-)

--
Jim Yanik
jyanik
at
localnet
dot com

==============================================================================
TOPIC: Intels 1 billion mistake
http://groups.google.com/group/sci.electronics.repair/t/6d28be07e85250d5?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Feb 17 2011 7:06 am
From: Allodoxaphobia

On Wed, 16 Feb 2011 15:06:19 -0800, Joe wrote:
> bob urz <sound@inetnebr.com> wrote:
>>
>> http://mbtmag.com/Content.aspx?id=1937
>
> Typical asinine reporting. There is *no date* on that article, Just
> mentions of "Monday", "January" and "February" without even a mention of
> *which year*.
>
> I guess we can all ASSume that the article is current, but what kind of
> sucky publisher puts out "news" articles without a date?
>
> Oh wait, below the bottom of the article is the line
>
> "Copyright 2011 The Associated Press."

Probably inserted by some PHP code using the current date of the 'view'.

==============================================================================
TOPIC: Arcam amp ...
http://groups.google.com/group/sci.electronics.repair/t/7cc228c388c21ebf?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Feb 17 2011 8:10 am
From: "N_Cook"

Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:uzc6p.13691$Ga7.9010@newsfe16.ams2...
> Anyone by any chance got schematics for an Arcam Alpha 10 amplifier ?
>
> TIA
>
> Arfa

Not motorized function sw prob I hope.

==============================================================================
TOPIC: Nikko Alpha 220
http://groups.google.com/group/sci.electronics.repair/t/6d4cff546b52714e?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Feb 17 2011 8:26 am
From: Tim Schwartz

Hello all,

I've got a Nikko Alpha 220 power amp here, and need to know the value
of R751/752/753/754. I'm pretty sure they are all the same value. If
someone has a service manual or schematic to share, that would be
terrific too.

Regards,
Tim Schwartz
Bristol Electronics

==============================================================================
TOPIC: Hp color laser CP1515 toner memory error
http://groups.google.com/group/sci.electronics.repair/t/89c28e605d9a116d?hl=en
==============================================================================

== 1 of 3 ==
Date: Thurs, Feb 17 2011 8:42 am
From: kwamena banson

On Feb 16, 1:32 pm, Archon <Chipbee40_Spa...@yahoo.com> wrote:
> On 2/16/2011 1:07 PM, kwamena banson wrote:> I just bought a set toner (black, red, yelow and blue) for my HP color
> > laser CP1515, after just one test print the printer can not print
> > again and is saying yellow toner memory error. I dont know whether its
> > the small chip on the toner that its talking about.
> > Another problem is when I insert the old yellow toner it says the
> > toner is empty mean while there is enougth toner in it.
> > I will be v. happy with any help. THANKS.
>
> I have a CP1518, try the supplies overide option, you will find there is
> usually lots of toner left.
> JC

Please JC how do I do this or where do I find the supplies overide
option? thanks

== 2 of 3 ==
Date: Thurs, Feb 17 2011 9:47 am
From: Archon

On 2/17/2011 11:42 AM, kwamena banson wrote:
> On Feb 16, 1:32 pm, Archon<Chipbee40_Spa...@yahoo.com> wrote:
>> On 2/16/2011 1:07 PM, kwamena banson wrote:> I just bought a set toner (black, red, yelow and blue) for my HP color
>>> laser CP1515, after just one test print the printer can not print
>>> again and is saying yellow toner memory error. I dont know whether its
>>> the small chip on the toner that its talking about.
>>> Another problem is when I insert the old yellow toner it says the
>>> toner is empty mean while there is enougth toner in it.
>>> I will be v. happy with any help. THANKS.
>>
>> I have a CP1518, try the supplies overide option, you will find there is
>> usually lots of toner left.
>> JC
>
> Please JC how do I do this or where do I find the supplies overide
> option? thanks
Do you have the manual? (you can download it from HP)

you press the OK button

Use the arrow keys to go to SYSTEM SETUP MENU

Then there is a submenu for Print quality : Replace supplies : Overide out

If you choose overide out, you can continue to print until the quality
becomes poor.

== 3 of 3 ==
Date: Thurs, Feb 17 2011 10:51 am
From: kwamena banson

On Feb 17, 9:47 am, Archon <Chipbee40_Spa...@yahoo.com> wrote:
> On 2/17/2011 11:42 AM, kwamena banson wrote:> On Feb 16, 1:32 pm, Archon<Chipbee40_Spa...@yahoo.com> wrote:
> >> On 2/16/2011 1:07 PM, kwamena banson wrote:> I just bought a set toner (black, red, yelow and blue) for my HP color
> >>> laser CP1515, after just one test print the printer can not print
> >>> again and is saying yellow toner memory error. I dont know whether its
> >>> the small chip on the toner that its talking about.
> >>> Another problem is when I insert the old yellow toner it says the
> >>> toner is empty mean while there is enougth toner in it.
> >>> I will be v. happy with any help. THANKS.
>
> >> I have a CP1518, try the supplies overide option, you will find there is
> >> usually lots of toner left.
> >> JC
>
> > Please JC how do I do this or where do I find the supplies overide
> > option? thanks
>
> Do you have the manual? (you can download it from HP)
>
> you press the OK button
>
> Use the arrow keys to go to SYSTEM SETUP MENU
>
> Then there is a submenu for Print quality : Replace supplies : Overide out
>
> If you choose overide out, you can continue to print until the quality
> becomes poor.
>
> JC

Thanks I will check that and give you feedback.

==============================================================================
TOPIC: Lenovo T60 laptop Audio problem
http://groups.google.com/group/sci.electronics.repair/t/3930a2df810fd896?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Feb 17 2011 11:08 am
From: kwamena banson

I formated my childs Lenovo T60 laptop(May be an IBM machine) and i'm
having problem with the sound. I tried loading it from the net but it
will not just work. all other drivers from the net worked but the
audio. I'm using Win XP Sp2. Help please. Thank you.

==============================================================================
TOPIC: The common ThinkPad powerup problem
http://groups.google.com/group/sci.electronics.repair/t/9730825a5202a5fd?hl=en
==============================================================================

== 1 of 2 ==
Date: Thurs, Feb 17 2011 2:35 pm
From: D Yuniskis

Hi,

I was handed an old T22 that "wouldn't power up".
I immediately tried the unplug, remove battery pack,
hold power depressed (for a long time), plug in
power and was able to get it to boot (no surprise
there).

Since this is such a common remedy for ThinkPads,
I started wondering what the actual *reason* (cause)
behind it might be.

Which prompted a web search for a schematic (so I
can see what *might* be going on when this happens).
Of course, no luck on that score...

So, anyone have an *informed* idea as to what is going
on (and, therefore, a worthwhile direction to pursue a
long-term fix!)?

Speculators need not apply... :-/

Thx,
--don

== 2 of 2 ==
Date: Thurs, Feb 17 2011 3:07 pm
From: Adrian C

On 17/02/2011 22:35, D Yuniskis wrote:
>
> Since this is such a common remedy for ThinkPads,
> I started wondering what the actual *reason* (cause)
> behind it might be.
>

Try here

<http://forums.lenovo.com/t5/T61-and-prior-T-series-ThinkPad/T23-won-t-power-up-with-good-battery/m-p/230682>

and also the thinkpads forum.

http://forum.thinkpads.com/viewtopic.php?f=28&t=87401

Some good speculation & answers given :)

> Which prompted a web search for a schematic (so I
> can see what *might* be going on when this happens).
> Of course, no luck on that score...

I have a schematic for the similar T23 I could mail you.

--
Adrian C

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TOPIC: How to find semiconductor replacements?
http://groups.google.com/group/sci.electronics.repair/t/dcb181e80eb71a20?hl=en
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== 1 of 1 ==
Date: Thurs, Feb 17 2011 3:02 pm
From: "Charles"

JEDEC part numbers used to mean something for discrete devices, now they
relate more to memory devices (ICs) and the like.

JEDEC still suggests package outlines, but they appear to have backed off
from other details that used to help repair technicians select reasonable
replacements for solid state devices. The 1N, 2N, 3N system is now
officially dead?

Pro-electron seems to be hanging in there, in this regard.

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