sci.electronics.repair - 12 new messages in 8 topics - digest

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

sci.electronics.repair@googlegroups.com

Today's topics:

==============================================================================
TOPIC: Behringer MDX2200
http://groups.google.com/group/sci.electronics.repair/t/689edcf5c79b72ba?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Apr 18 2011 3:18 pm
From: "Gareth Magennis"

"Ron" <ron@lunevalleyaudio.com> wrote in message
news:46Kdndamm9_prTXQnZ2dnUVZ7rGdnZ2d@bt.com...
> On 15/04/2011 12:29, Ron wrote:
>> Has anyone got a circuit diagram for a Behringer MDX2200 composer Pro
>> please?
>>
>> C/dags for Alto ACL2Pro would probably be the same.
>>
>> Ron
>
> Belay that, Alto circuits found
>
> Ron

Hi Ron, does that mean some Behringer products are rebadaged and
schematics available?

Gareth.

==============================================================================
TOPIC: Would you stop for a moment?!
http://groups.google.com/group/sci.electronics.repair/t/579e72d06bf9acbe?hl=en
==============================================================================

== 1 of 2 ==
Date: Mon, Apr 18 2011 3:18 pm
From: "Dave Plowman (News)"

In article
<f9942c32-6d3b-4efa-84a8-598b4ac8caeb@g7g2000pro.googlegroups.com>,
spamtrap1888 <spamtrap1888@gmail.com> wrote:
> The first act Jesus performed in His public life was to turn water
> into wine, so that members of a wedding party could continue to enjoy
> themselves. (John, Chapter 2).

Very stupid thing to do given how many are addicted to it.

> Yet Mohammed wrote that wine comes from
> Satan. (Sura 5, Verse 92)

He obviously could enjoy himself without needing drugs.

> Any religion that equates Jesus with Satan
> is not the right religion.

Likely the translations are of their time. Brewing was once used to purify
water rather than for the alcohol itself.

--
*Isn't it a bit unnerving that doctors call what they do "practice?"

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

== 2 of 2 ==
Date: Mon, Apr 18 2011 4:35 pm
From: spamtrap1888

On Apr 18, 3:18 pm, "Dave Plowman (News)" <d...@davenoise.co.uk>
wrote:
> In article
> <f9942c32-6d3b-4efa-84a8-598b4ac8c...@g7g2000pro.googlegroups.com>,
> spamtrap1888 <spamtrap1...@gmail.com> wrote:
>
> > The first act Jesus performed in His public life was to turn water
> > into wine, so that members of a wedding party could continue to enjoy
> > themselves. (John, Chapter 2).
>
> Very stupid thing to do given how many are addicted to it.

Enjoy your Baptist heaven of cola and liquorice all-sorts, heretic.

>
> > Yet Mohammed wrote that wine comes from
> > Satan. (Sura 5, Verse 92)
>
> He obviously could enjoy himself without needing drugs.

Wine is a food, and represents the Blood of Christ later in the story.

> > Any religion that equates Jesus with Satan
> > is not the right religion.
>
> Likely the translations are of their time. Brewing was once used to purify
> water rather than for the alcohol itself.
>

"Kalon Oinon" = the good wine

Not the "good Ribena concentrate"

http://www.scripture4all.org/OnlineInterlinear/NTpdf/joh2.pdf

==============================================================================
TOPIC: Battery replacement Sony MDR-IF5 headphones?
http://groups.google.com/group/sci.electronics.repair/t/b82f1e78d16044f8?hl=en
==============================================================================

== 1 of 2 ==
Date: Mon, Apr 18 2011 5:54 pm
From: "Arfa Daily"

"myfathersson" <licensedtoquill@gmail.com> wrote in message
news:92eb79e8-748e-4270-9bbf-8d75d32ae596@r35g2000prj.googlegroups.com...
> Any one know how to get a replacement battery for these cordless
> headphones please? I called Sony and they told me that they are a
> 1-528-287-11. They then said that these have been replaced by the
> 152817971 which is alson apparently not available.
>
> On further checking, they said they are in fact a triple A.
>
> I cant figure out how on earth to put a triple A into these narrow
> headphones
>
> Anyone got any ideas please?

Don't know if it was the same model, but I did battery replacements on a few
Sony Wireless headphone sets for a friend of mine who buys retailers'
'returns' by the pallet-load. These ones were indeed a pair of AAA NiMHi
cells, but they were bonded together into a 'carrier' package that had a
slot up the middle to correspond to a small offset 'wall' in the battery
compartment, to make sure that they could not be inserted backwards. But
here's the trick. The carrier was important to the operation, as it worked a
tiny little switch as the batteries were inserted. This is presumably to
stop people inserting dry cell AAAs, which of course would then get mighty
upset when you put the headphones back on their charging station. The
unfortunate thing is, that it also prevents you from putting in a couple of
loose AAA re-chargables. I got around this by cutting a piece of modeler's
plastic to the size of the base of the original package. I then used a sharp
scalpel to cut out the required slot, and finally fixed the cells to the
plastic base with hot melt glue. When this 'assembly' is inserted into the
battery compartment, the switch is pushed over by the plastic base, and the
batteries are then allowed to charge, and power the headphones.

Arfa

== 2 of 2 ==
Date: Mon, Apr 18 2011 9:31 pm
From: myfathersson

On Apr 18, 5:54 pm, "William Sommerwerck" <grizzledgee...@comcast.net>
wrote:
> Have you opened the headphones to confirm or deny the size of the batteries?

I managed to get a Sony pro on the phone this afternoon and he
confirmed that from the manual they are button cells of some type
which look (to him) about three times the width of any normal button
cell??

The unit has to be taken fully apart to get at it so i was wondering
if anyone had gone through this exercise before (before I do and
discover that there is indeed no replacement!)

==============================================================================
TOPIC: minidisc player shows track but won't play tracks
http://groups.google.com/group/sci.electronics.repair/t/305742f0844c5c34?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Apr 18 2011 6:07 pm
From: "Arfa Daily"

"willywainwright" <ww10@mac.com> wrote in message
news:1360b0ff-dfc8-4fd6-b13b-18a3c0ca4f95@a21g2000prj.googlegroups.com...
> On Apr 17, 5:38 pm, "Arfa Daily" <arfa.da...@ntlworld.com> wrote:
>> "willywainwright" <w...@mac.com> wrote in message
>>
>> news:25afe1d0-f5ec-423f-ae7c-a22b29f43c59@q40g2000prh.googlegroups.com...
>>
>>
>>
>>
>>
>> > On Apr 16, 12:23 pm, a7yvm109gf...@netzero.com wrote:
>> >> On Apr 16, 12:10 pm, willywainwright <w...@mac.com> wrote:
>>
>> >> > hello, I have a number of sony minidisc players that suddenly won't
>> >> > play the track for no apparent reason. I've tried batteries and plug
>> >> > in power with no difference. Powers up fine, shows spinning icon in
>> >> > window, track number shows but I can't get the units to play the
>> >> > disc.
>> >> > I've tried it in all positions, even upside down and sideways but
>> >> > still no playing of disc
>> >> > any ideas?
>> >> > willy
>>
>> >> 1) Try lens cleaner disc.
>> >> 2) Now toss the whole shebang in the garbage
>> >> 3) Get a free cell phone, even they'll come with a MP3 player.
>>
>> >> Minidisc is over. It's dead, finished, kaput. And I'm speaking as
>> >> someone who bought a MZ-1 when they first came out.
>>
>> > maybe a lens cleaner disc would work. wonder if I can find one. I'll
>> > give it a try. Garbage is full of my cassette tapes and players and
>> > all my 8-track tapes. Willy
>>
>> Never ever use 'cleaner' discs - not that I recall ever seeing one for a
>> mindisc anyway. They invariably never do anything to help, and in the
>> case
>> of DVDs, I've seen them cause expensive damage where the little 'brush'
>> hairs embedded in the disc, have caught in the lens suspension, and
>> mangled
>> it as the disc has then rotated. I used to do a lot of work on Sony MD
>> players, when a guy that I did work for was a regional service centre.
>> For
>> the most part, failure to play discs is down to a worn out laser.
>> Sometimes,
>> you can get around that for a while, by resetting the laser parameters
>> via
>> built in diagnostic software, but it is a complex and tricky procedure to
>> do. Another thing to check is that when the disc is loaded, it is free to
>> rotate. I had many examples where the turntable had been pushed down on
>> the
>> motor shaft, until it jammed the motor. Another very common problem was
>> 'crap in the works'. The sled drive comprises gears with *very* fine
>> teeth.
>> The slightest bit of contamination in them, is enough to stop the gears
>> from
>> turning. The contamination in question, often seemed to be very fine
>> sand,
>> but I guess that it could have been 'pocket grit'. Just one grain in one
>> of
>> the gear teeth, will jam the mech and stop the laser from homing, which
>> will
>> result in the disc failing to spin up, and the TOC not being read.
>> Finally,
>> I suppose you do actually see the display come up and hear the disc
>> loading
>> as though it's about to do everything normally ? I have had cases where
>> the
>> door-closed sense switch has caused problems. A word of warning though.
>> You
>> need to have the patience of a saint to work on these things, and some
>> very
>> fine tools, including a quality set of Philips jeweler's screwdrivers,
>> and
>> pointed tweezers. Magnetize the screwdriver first. The tiny little screws
>> are no bigger than an ant, and easily lost. Work on a large sheet of
>> paper,
>> and use a strong light, and a magnifying glass. And you need to be able
>> to
>> hold your breath pretty well, also ... d :-|
>>
>> Arfa
>
> Thank you Arfa, great reply, full of good info. Don't know that I will
> attempt the fix but at least I want to be sure it's not something I've
> overlooked,like the hold switch set to on. In this case I guess these
> things just wear out after awhile. Would you, or anyone, know of a
> good repair shop to send these units to? And also, would you be able
> to tell me about how much you guys used to charge for repairs. Hourly?
> just curious.
> Willy

My going rate for this sort of stuff is around 22 UKP ( $35 ) an hour. It's
not really a true reflection of the complexity / fiddly nature of the work,
but it's about the most that these jobs will stand. Any more than an hour
plus parts, effectively writes them off.

Arfa

==============================================================================
TOPIC: Request transistor cross reference
http://groups.google.com/group/sci.electronics.repair/t/6d311b79499b89d6?hl=en
==============================================================================

== 1 of 3 ==
Date: Mon, Apr 18 2011 6:55 pm
From: Jeff Liebermann

On Sun, 17 Apr 2011 21:04:28 -0400, "Barry" <none@nospam.org> wrote:

Welcome back. You were missed.

>To someone who understands these specs, and knows which ones are critical
>to the application, this is all that is needed. To someone who wants to
>buy a NTE "drop-in" part, I suggest you go to one of the Asian parts
>suppliers who advertise that they can get the original part.

NTE does not list a substitute. I've dealt with some of the "obsolete
parts" vendors. Figure on about a $200 minimum, whether you want 1
part or 100 parts. When I once absolutely had to buy from one of
these vendors, the negotiation to delivery ordeal took about 4 weeks.

>I found a part rated at 1000 BVces, 450 BVceo, 30 amps, and 250 watts.
>It has a f(sub)T of 10 MHz and a Vce(sat) of 2 volts at 20 amps.
>Now YOU tell me if this will work or not... Both Mouser and Digi-Key
>found this part.
> Barry WA4VZQ

I thought this was going to be easy. I was wrong.

From the original data sheet at:
<http://www.datasheets.org.uk/T30G40*-datasheet.html>
With a saturation voltage of 2V at 30A, it's certainly an IGBT. Lots
to chose from on Digikey, but not in the package shown. I'll guess
the package is a TO-264 or TO-3PL
<www.fairchildsemi.com/products/discrete/pdf/to264.pdf>
I couldn't find a close match with the correct package on Digikey or
Mouser. All the TO-264 package devices are higher power, with higher
saturation voltages. Some compromises will need to be made here.

For those that have never used the Digikey parts search, it's best to
explain how to use it by example. Start here for discrete IGBT's.
<http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=1376382&k=igbt>
Under "Package", highlight "TO-264".
Hit the "Apply Filters" and notice how the choices are reduced.
Notice that under "Ic Max", there's no choice for "30A". Pick "40A"
and again hit "Apply Filters". You should see 2 devices listed,
neither of which is suitable. Try some of the other TO-264 package
variations for more trial and error. Eventually, it finds:
<http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=IXSK40N60BD1-ND>
in a TO-264AA package, which is not an exact substitute, but might
work. Someone please check my guesswork. If you look at the data
sheet, it shows a gate instead of a base lead, but if you read the
fine print, it's really an IGBT, and not a FET.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

== 2 of 3 ==
Date: Mon, Apr 18 2011 8:43 pm
From: "Barry"

"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:a3npq651n2jkqvm73ilh24q2qkgcksllqc@4ax.com...
> On Sun, 17 Apr 2011 21:04:28 -0400, "Barry" <none@nospam.org> wrote:
>
> Welcome back. You were missed.

Thanks, Jeff

>>To someone who understands these specs, and knows which ones are
>>critical
>>to the application, this is all that is needed. To someone who wants
>>to
>>buy a NTE "drop-in" part, I suggest you go to one of the Asian parts
>>suppliers who advertise that they can get the original part.
>
> NTE does not list a substitute. I've dealt with some of the "obsolete
> parts" vendors. Figure on about a $200 minimum, whether you want 1
> part or 100 parts. When I once absolutely had to buy from one of
> these vendors, the negotiation to delivery ordeal took about 4 weeks.
>
>>I found a part rated at 1000 BVces, 450 BVceo, 30 amps, and 250 watts.
>>It has a f(sub)T of 10 MHz and a Vce(sat) of 2 volts at 20 amps.
>>Now YOU tell me if this will work or not... Both Mouser and Digi-Key
>>found this part.
>> Barry WA4VZQ

To begin, it is really a conventional NPN, not an IGBT. You have to
learn
that Digi-Key and Mouser are not perfect in their searches. I had to
relax
the specs to find the part - like using 20 amps rather than 30. However
when I checked the datasheet, the part was really rated at 30 amps. Go
figure...

> I thought this was going to be easy. I was wrong.
>
> From the original data sheet at:
> <http://www.datasheets.org.uk/T30G40*-datasheet.html>
> With a saturation voltage of 2V at 30A, it's certainly an IGBT.

Look at the very high base current. This is how the low Vce(sat) is
obtained. Also note the Vbe(sat).

>Lots to chose from on Digikey, but not in the package shown. I'll guess
> the package is a TO-264 or TO-3PL

It's a TO-247 case. Actually starting the search with the package style,
in my opinion, is a poor place to start. You need to match the critical
specs first. In this case, high breakdown voltage, high current, and low
saturation voltage were the critical specs to match first.

> <www.fairchildsemi.com/products/discrete/pdf/to264.pdf>
> I couldn't find a close match with the correct package on Digikey or
> Mouser. All the TO-264 package devices are higher power, with higher
> saturation voltages. Some compromises will need to be made here.

To avoid all the suspense, look at an OnSemi MJW18020. OnSemi even
has Spice2, PSpice, and Spice3 models as well as a Saber model for it.
While Digi-Key does not stock them, Mouser has them at less than $6 a
pop.

> For those that have never used the Digikey parts search, it's best to
> explain how to use it by example. Start here for discrete IGBT's.
> <http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=1376382&k=igbt>
> Under "Package", highlight "TO-264".
> Hit the "Apply Filters" and notice how the choices are reduced.
> Notice that under "Ic Max", there's no choice for "30A". Pick "40A"
> and again hit "Apply Filters". You should see 2 devices listed,
> neither of which is suitable. Try some of the other TO-264 package
> variations for more trial and error. Eventually, it finds:
> <http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=IXSK40N60BD1-ND>
> in a TO-264AA package, which is not an exact substitute, but might
> work. Someone please check my guesswork. If you look at the data
> sheet, it shows a gate instead of a base lead, but if you read the
> fine print, it's really an IGBT, and not a FET.
> --
> Jeff Liebermann jeffl@cruzio.com
> 150 Felker St #D http://www.LearnByDestroying.com
> Santa Cruz CA 95060 http://802.11junk.com
> Skype: JeffLiebermann AE6KS 831-336-2558

I know we are dating ourselves here, Jeff, but bipolar transistors are
much like vacuum tubes in that triodes are triodes and with some
changes in circuit values (and rewiring, of course) just about any triode
can be made to work in a pinch. Actually bipolar transistors generally
are even easier to substitute than vacuum tubes.

Do you have an NTE replacement book handy? Notice how many
transistors can be replaced by the NTE123AP. Look up the specs on
a 2N3904. The 2N3904 is far cheaper ($0.07) than the NTE part and can
probably be used anywhere the NTE123AP ($1.25) can be used.

73, Barry WA4VZQ

One other thing when using the Digi-Key or Mouser search engines...
If you need a part with, say, a BVceo of 100 volts or more, you can
highlight 100, 150, 200, and 250 volts at the same time. ?This will
usually speed up the search. I do like Mouser's engine in that it
immediately tells you that no part is available with that specification,
while Digi-Key waits until you do the filtering - not knowing which
spec cannot be met.

== 3 of 3 ==
Date: Mon, Apr 18 2011 10:06 pm
From: Jeff Liebermann

On Mon, 18 Apr 2011 23:43:35 -0400, "Barry" <none@nospam.org> wrote:

>To begin, it is really a conventional NPN, not an IGBT.

I'm not sure. Getting a Vce(sat) of 2V at 30A is a difficult feat
with most conventional NPN xsistors. Low saturation voltage is the
major benefit of IGBT. However, the original data sheet specifies the
device beta, which is not normally specified with an IGBT, which acts
more like a MOSFET.

>You have to learn that Digi-Key and Mouser are not perfect in their
>searches. I had to relax the specs to find the part - like using
>20 amps rather than 30. However when I checked the datasheet, the
>part was really rated at 30 amps. Go figure...

Data entry error? I rarely have to lookup anything by specifications
so the problem is fairly new to me. Usually, I just lookup the part
number, and dig through the mess of package mutations. I haven't
found too many errors.

>> From the original data sheet at:
>> <http://www.datasheets.org.uk/T30G40*-datasheet.html>
>> With a saturation voltage of 2V at 30A, it's certainly an IGBT.
>
>Look at the very high base current. This is how the low Vce(sat) is
>obtained. Also note the Vbe(sat).

Ib = 5Amps and Vbe(sat) = 2.5V. Now, I'm sure it's an IGBT. Such a
high base voltage and current is a characteristic of IGBT devices. See
typical curves at:
<http://en.wikipedia.org/wiki/File:IvsV_IGBT.png>
If it were an NPN transistor, the curves would be compressed around
Vbe(sat) = 0.7v to 1.0v (or slightly more if it has emitter current
balancing resistors inside) and have an upward slope.

I'm still undecided if it's an IGBT or a common xsistor, but I'm
begining to agree with you.

>> I'll guess the package is a TO-264 or TO-3PL
>
>It's a TO-247 case.

I beg to differ (again). The original T30G40 data sheet shows the
package as 20.5 x 26.5 mm with a 3.3mm hole. The TO-247 package is
16.0 x 21 mm with a 3.0mm hole. The TO-264 is 20 x 20 mm with a 3.3mm
hole. Neither is a perfect match, but methinks the TO-264 is closer,
especially due to having the same larger hole size.
<http://www.fairchildsemi.com/products/discrete/pdf/to247pdd_dim.pdf>
<http://www.fairchildsemi.com/products/discrete/pdf/to264.pdf>

>Actually starting the search with the package style,
>in my opinion, is a poor place to start.

I beg to differ (yet again). Finding a suitable replacement that
doesn't fit in whatever is being repaired is rather useless. By
reducing the search to only those items that can actually be used as a
physical substitute, the search scope is drastically reduced.

>You need to match the critical
>specs first. In this case, high breakdown voltage, high current, and low
>saturation voltage were the critical specs to match first.

I went for package, Vceo(max), Vce(sat), Ic(max), and Pt(max) in that
order.

>To avoid all the suspense, look at an OnSemi MJW18020. OnSemi even
>has Spice2, PSpice, and Spice3 models as well as a Saber model for it.
>While Digi-Key does not stock them, Mouser has them at less than $6 a
>pop.

<http://www.onsemi.com/pub_link/Collateral/MJW18020-D.PDF>
Nope. Other then my objection to the package (hole too small), the
beta is too low. The original has a minimum beta of 80, while this
xsistor shows a minimum of 5.5 at 20A.

Unfortunately, the device I excavated doesn't specify the beta.
<http://ixdev.ixys.com/DataSheet/98573.pdf>
Argh!

>I know we are dating ourselves here, Jeff, but bipolar transistors are
>much like vacuum tubes in that triodes are triodes and with some
>changes in circuit values (and rewiring, of course) just about any triode
>can be made to work in a pinch. Actually bipolar transistors generally
>are even easier to substitute than vacuum tubes.

I like to think of FET's as a solid state analogue to vacuum tubes. I
was in college when the transition from tube to semiconductors was
taught. Over the 6 years of various skools, I started with tubes,
delved into bipolar, and graduated with FET's. Keeping them untangles
was not a trivial exercise, but I'm comfortable working in all three
areas.

>Do you have an NTE replacement book handy?

Books? They tend to obsolete as soon as they're printed. I prefer
online lookups.
<http://www.nteinc.com>

>Notice how many
>transistors can be replaced by the NTE123AP.

<http://www.nteinc.com/specs/100to199/pdf/nte123ap.pdf>
The online lookup doesn't have a reverse NTE -> JEDEC lookup so I
can't check how many the devices the NTE123AP replaces.

>Look up the specs on
>a 2N3904. The 2N3904 is far cheaper ($0.07) than the NTE part and can
>probably be used anywhere the NTE123AP ($1.25) can be used.

Sure. The NTE123AP is probably a relabeled 2N3904 or 2N2222, both
very common parts. You're also paying for handling, bubble packaging,
cataloging, distribution, and retail floor space for the NTE part. The
2N3904 part is sold by the thousands, while NTE parts tend to be sold
one at a time. Of course the NTE parts are more expensive.

>One other thing when using the Digi-Key or Mouser search engines...
>If you need a part with, say, a BVceo of 100 volts or more, you can
>highlight 100, 150, 200, and 250 volts at the same time.

Oops. I never noticed that you can select more than one. Thanks.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

==============================================================================
TOPIC: JOIN NOW- ITS FREE - MATRIMONY.COM - TO FIND YOUR PERFECT LOVE
http://groups.google.com/group/sci.electronics.repair/t/b6035737c181047a?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Apr 18 2011 10:51 pm
From: MAGESH RIDER

http://123maza.com/65/born510/

==============================================================================
TOPIC: Plugs but no jacks
http://groups.google.com/group/sci.electronics.repair/t/387c4b30df150ab0?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Apr 18 2011 10:55 pm
From: mm

On Tue, 15 Mar 2011 10:56:35 +0000, baron
<baron.nospam@linuxmaniac.nospam.net> wrote:

>Fuddy Dud Inscribed thus:
>
>> Everybody sells 3.5mm plugs but nobody sells 3.5mm jack that you can
>> mount and solder wires to. Is there a source? Most dealers don't even
>> know the difference.
>>
>
>Salvage some from old modems or PC sound cards !

Wow. I'm still getting them from radios and portable tvs. I'm 3
ahead now of the number I've used.

==============================================================================
TOPIC: Trying to get into the BIOS
http://groups.google.com/group/sci.electronics.repair/t/fd87ae1ce28c1c89?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Apr 19 2011 12:45 am
From: who where

On Mon, 18 Apr 2011 12:54:58 -0700 (PDT), mike
<mlightner@survivormail.com> wrote:

>On Apr 18, 2:10 pm, Mike Tomlinson <m...@jasper.org.uk> wrote:
>> In article <e0900b0a-d06f-4d77-87bd-aada32faf...@gu8g2000vbb.googlegroup
>> s.com>, mike <mlight...@survivormail.com> writes
>>
>> > I ran into in a few different places, where from a Dos prompt you go
>> >into DEBUG and supposedly change the values in some register that will
>> >make the bios lose the password requirement - so far it hasn't worked,
>> >don't know if I'm following the instructions correctly or not.
>>
>> boot DOS
>> run debug. '-' is the debug prompt, you don't type this.
>>
>> - o 70 10
>> - o 71 0
>> - q
>>
>> that's "oh, seventy, ten / oh, seventy-one, zero"
>>
>> reboot.
>>
>> with a bit of luck, password will be gone.
>>
>> --
>> (\__/)
>> (='.'=)
>> (")_(")
>
>All right, thanks! I'll give that a try probably this evening.

Failing that, locate a copy of KILLCMOS, a small utility that writes
to cmos RAM and *causes* a checksum error there. The result is that
on a subsequent bootup you will be directed to setup (without
requiring a pswd) where you can clear the pswd requirement.

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sci.electronics.repair - 12 new messages in 8 topics - digest

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