Any parts of a LASERJET 5Si that can be salvaged?

[Gunner]

On Fri, 24 Jun 2005 16:04:45 -0400, "Rita Ä Berkowitz" <ritaberk2O04
@aol.com> wrote:

"NSM" <nowrite@to.me> wrote in message...

Any TV that's been sitting for a week won't have a charge in it.

BULLSHIT! Put your tongue on the HV lead of the flyback transformer six
months after you unplugged it and you'll probably piss all over yourself if
you are lucky..



Rita


Been there..done that..still remember the spasms.. but I wasn't

stupid enough to use my tounge.

Fingers were quite enough.

Gunner

"Considering the events of recent years,
the world has a long way to go to regain
its credibility and reputation with the US."
unknown

 

[Joseph Gwinn]

In article <g1ive.3722$re.2953@newssvr19.news.prodigy.com>,
"Angrie.Woman" <Angrie.Woman@ggmail.com> wrote:

NSM wrote:
"Tom MacIntyre" <tom__macintyre@hotmail.com> wrote in message
news:r10rb1dtko3pn7v4dvogr7082runus0d1r@4ax.com...


True...PC monitors seem to be a different story, in my experience.


And I'm mighty cautious of microwave ovens.


I have a question. If I put a cellphone in a microwave oven, close the
door, call the number....should it ring?

The shielding is not required to be perfect, cutting the ~600 watts RF
internal leftover-heating power to something like a milliwatt of leakage
per centimeter of door seal (I don't recall the exact number, but it
will be *somewhere* on the FCC website), which would be something like
100 milliwatts total leakage for a small door. The intent is only to
reduce the leakage to safe power levels; there will always be some
leakage.

Also, the seals on a microwave oven are only required to work at 2,450
MHz, while cellphones are more like 900 MHz, and some very good kinds of
door seals (choke seals) are tuned to a specific frequency, and so would
fail miserably at 1/3 the design frequency.

So, if you are close to a cellphone base station, one can imagine that
the phone inside the microwave could still hear the call and ring.

Joe Gwinn

 

[Sam Goldwasser]

Tom MacIntyre <tom__macintyre@hotmail.com> writes:

On Sat, 25 Jun 2005 01:25:45 GMT, "BrotherBart"
BrotherBart@whoseyourdaddy.net> wrote:

If you've got no pride, just pick up anything but a TV (unless you know
how to discharge the cap) from the garbage and give it a go.

When I was five years old my dad was less than impressed when I took his
pocket watch apart.


BG

My dad was a very good backyard mechanic, but for some reason didn't
get into the more intricate stuff. One sunny summer Saturday morning,
I placed a sheet of plywood on the ground, removed the Carter BBD (I
think) carburator from the 225 slant-six motor in the 1965 Dodge
Polara station wagon he was preparing for the road, and stripped it
down on the sheet of plywood. My dad had worked a backshift, and at
about 1130 or so came outside, and turned white as a sheet. He said,
"Are you sure you can get that thing back together?" I assured him
that I could, and I did, and the car lived to ride again.

I still don't understand why a man who could strip down a motor or
transmission, install new rings, valves, etc., had a problem with a
carburator...I couldn't rebuild a motor to save my own life, but I've
rebuilt a number of carburators...strange.

Because, as we all know, some parts of automotive carburetors run on
magic. And like the smoke sealed up inside working electronic components,
you really don't want to let it escape.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.

 

[Don Lancaster]

Angrie.Woman wrote:

NSM wrote:

"Tom MacIntyre" <tom__macintyre@hotmail.com> wrote in message
news:r10rb1dtko3pn7v4dvogr7082runus0d1r@4ax.com...


True...PC monitors seem to be a different story, in my experience.



And I'm mighty cautious of microwave ovens.


I have a question. If I put a cellphone in a microwave oven, close the
door, call the number....should it ring?

A

Depends on the Poodle.


--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

[NSM]

"Angrie.Woman" <Angrie.Woman@ggmail.com> wrote in message
news:V4jve.7351$Y75.971@newssvr17.news.prodigy.com...

Yes...the last "real" job I had was for a telecommunications services
provider. They installed and maintained towers, as well as the cellular,
and microwave equipment, associated with all of it.

The guys used to do that to prove that the ovens weren't really all that
well insulated, but I always wondered if there was another reason that
might happen.

Thinking about that, the front has a pierced panel that blocks radiation at
around 2.5 gigahertz, however the cell phone runs at around 800 MHz so it's
possible enough of that frequency will leak through to make it work.

N

 

[James Sweet]

One time we were sending a bunch of CRT's back to the manufacturer for
proof-of- replacement one time, and my wife was labelling them. She
was wearing a knitted sweater, and the sleeve brushed against the 2nd
anode. She wasn't pleased with the result. The CRT had been sitting
for weeks to months...

Tom

A CRT that's not connected to the HV lead won't have any path to ground to
bleed the charge off, it'll pick up static from the air over time.

 

[Angrie.Woman]

Joseph Gwinn wrote:

In article <g1ive.3722$re.2953@newssvr19.news.prodigy.com>,
"Angrie.Woman" <Angrie.Woman@ggmail.com> wrote:


NSM wrote:

"Tom MacIntyre" <tom__macintyre@hotmail.com> wrote in message
news:r10rb1dtko3pn7v4dvogr7082runus0d1r@4ax.com...



True...PC monitors seem to be a different story, in my experience.


And I'm mighty cautious of microwave ovens.


I have a question. If I put a cellphone in a microwave oven, close the
door, call the number....should it ring?


The shielding is not required to be perfect, cutting the ~600 watts RF
internal leftover-heating power to something like a milliwatt of leakage
per centimeter of door seal (I don't recall the exact number, but it
will be *somewhere* on the FCC website), which would be something like
100 milliwatts total leakage for a small door. The intent is only to
reduce the leakage to safe power levels; there will always be some
leakage.

Also, the seals on a microwave oven are only required to work at 2,450
MHz, while cellphones are more like 900 MHz, and some very good kinds of
door seals (choke seals) are tuned to a specific frequency, and so would
fail miserably at 1/3 the design frequency.

So, if you are close to a cellphone base station, one can imagine that
the phone inside the microwave could still hear the call and ring.

Cool - thanks for the explanation!

A

 

[Tom Miller]

That concept has been checked out by "Mythbusters" and found to be
essentially a myth.
Never the less I would check the direction before pointing.

"Christopher Tidy" <cdt22NOSPAM@cantabgold.net> wrote in message
news:42BCB240.8000003@cantabgold.net...

JohnM wrote:

I've never considered pissing all over myself to be a lucky thing..



I think the alternative is having your heart stop from the shock.

A


How about if I just don't put my tongue on electrical stuff, then I
won't have to be thankful for pissing myself;-)

I think I just don't ever want to be thankful for that..

A while back I read in a tabloid about a man who had a nasty accident
after he left a bar drunken in the early hours. He was walking home with
a few mates when he needed to relieve himself. His mates dared him to
pee off the parapet of a railway bridge, which he did. Apparently his
stream of urine hit the 25 kV overhead wire which supplied the trains,
and he had a difficult job explaining the situation to a doctor at the
hospital when he came to.

Chris

 

[James Sweet]

I suspected so. I imagine that if you peed from a height of more than a
few feet, the stream of urine would break up into droplets and would not
form the necessary conductive path. Still, I wouldn't want to try it
with 25 kV.

Yeah on that chance that a solid stream did connect, pee is a pretty good
conductor of electricity, I know people who've accidently peed on electric
fences and I do know for a fact that it'll bite you.

 

[Christopher Tidy]

Tom Miller wrote:

"Christopher Tidy" <cdt22NOSPAM@cantabgold.net> wrote in message
news:42BCB240.8000003@cantabgold.net...

JohnM wrote:


I've never considered pissing all over myself to be a lucky thing..



I think the alternative is having your heart stop from the shock.

A


How about if I just don't put my tongue on electrical stuff, then I
won't have to be thankful for pissing myself;-)

I think I just don't ever want to be thankful for that..

A while back I read in a tabloid about a man who had a nasty accident
after he left a bar drunken in the early hours. He was walking home with
a few mates when he needed to relieve himself. His mates dared him to
pee off the parapet of a railway bridge, which he did. Apparently his
stream of urine hit the 25 kV overhead wire which supplied the trains,
and he had a difficult job explaining the situation to a doctor at the
hospital when he came to.

That concept has been checked out by "Mythbusters" and found to be
essentially a myth.
Never the less I would check the direction before pointing.

I suspected so. I imagine that if you peed from a height of more than a
few feet, the stream of urine would break up into droplets and would not
form the necessary conductive path. Still, I wouldn't want to try it
with 25 kV.

Chris

 

[Christopher Tidy]

Tom Miller wrote:

"Christopher Tidy" <cdt22NOSPAM@cantabgold.net> wrote in message
news:42BCB240.8000003@cantabgold.net...

JohnM wrote:


I've never considered pissing all over myself to be a lucky thing..



I think the alternative is having your heart stop from the shock.

A


How about if I just don't put my tongue on electrical stuff, then I
won't have to be thankful for pissing myself;-)

I think I just don't ever want to be thankful for that..

A while back I read in a tabloid about a man who had a nasty accident
after he left a bar drunken in the early hours. He was walking home with
a few mates when he needed to relieve himself. His mates dared him to
pee off the parapet of a railway bridge, which he did. Apparently his
stream of urine hit the 25 kV overhead wire which supplied the trains,
and he had a difficult job explaining the situation to a doctor at the
hospital when he came to.

That concept has been checked out by "Mythbusters" and found to be
essentially a myth.
Never the less I would check the direction before pointing.

I suspected so. I imagine that if you peed from a height of more than a
few feet, the stream of urine would break up into droplets and would not
form the necessary conductive path. Still, I wouldn't want to try it
with 25 kV.

Chris

 

[NSM]

"Christopher Tidy" <cdt22NOSPAM@cantabgold.net> wrote in message
news:42BDFFE7.6020909@cantabgold.net...

I suspected so. I imagine that if you peed from a height of more than a
few feet, the stream of urine would break up into droplets and would not
form the necessary conductive path. Still, I wouldn't want to try it
with 25 kV.

In New Zealand they have interisland undersea lines which run at 500 KV DC
IIRC and they wash the salt off the insulators with a 'chopped' spray jet of
water. Scary job IMO.

N

 

[Tom Quackenbush]

Maarten wrote:

Maarten wrote:
Tom Quackenbush wrote:

Completely off topic, but would you happen to know if "Quackenbush"
(Quackenbos?, Kwakkenbos?) means anything in Dutch?
Maybe the name of a location. As a word it has no real meaning.

Ah, only now I see your name... I don't know about it's etimology. It
could have something to do with ducks and wood, maybe your ancestors
lived near a ducktrap. I guess that's not too good an explanation...

Thanks for the reply.

I had heard that it meant "frog in forest", or words to that
effect. The "forest" part makes sense, but maybe not the "frog" part.

Duck trapping wouldn't be such a bad profession, I guess. Sounds
better than "nightsoil collectors".
--
Kind regards,
Tom Q.

Remove bogusinfo to reply.

 

[Gunner]

On Sun, 26 Jun 2005 00:14:53 GMT, "James Sweet"
<jamessweet@hotmail.com> wrote:

I suspected so. I imagine that if you peed from a height of more than a
few feet, the stream of urine would break up into droplets and would not
form the necessary conductive path. Still, I wouldn't want to try it
with 25 kV.



Yeah on that chance that a solid stream did connect, pee is a pretty good
conductor of electricity, I know people who've accidently peed on electric
fences and I do know for a fact that it'll bite you.

Electric fence...been there..done that..still tend to curl into the

fetal position at the memory..

Gunner

"Considering the events of recent years,
the world has a long way to go to regain
its credibility and reputation with the US."
unknown

 

In sci.electronics.repair Tom Quackenbush <tquacken@bogusinfo.sover.net> wrote:

I had heard that it meant "frog in forest", or words to that
effect. The "forest" part makes sense, but maybe not the "frog" part.

Well, both ducks and frogs say 'quack', (kwak in dutch) so it could be
true.

Duck trapping wouldn't be such a bad profession, I guess. Sounds
better than "nightsoil collectors".

;-)

---
Met vriendelijke groet,

Maarten Bakker.

 

[Don Lancaster]

Too_Many_Tools wrote:

Good article...thanks for posting it.

A related question for the group...what kinds of electronic "trash" IS
worth disassembling and keeping?

TMT

See the many tutorials on my website.
Especially http://www.tinaja.com/glib/refurblg.pdf

Pen plotters are useless. Pen plotter motors are useless.
But heh heh heh laser lightshow galvos fly on outta here.

Relay racks are unsellable at any price.
But heh heh heh their drawer sliders resell for sixty bucks a pair.

Water soluble swimsuits are very much in demand by quilters and felters.
Astronomers snarf up voting booths as fast as you can offer them.

Precision ways and sliders sell for outrageously high prices.As does
robotics anything.



--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

[Joseph Gwinn]

In article <Lolve.107258$on1.101522@clgrps13>, "NSM" <nowrite@to.me>
wrote:

"Angrie.Woman" <Angrie.Woman@ggmail.com> wrote in message
news:V4jve.7351$Y75.971@newssvr17.news.prodigy.com...

Yes...the last "real" job I had was for a telecommunications services
provider. They installed and maintained towers, as well as the cellular,
and microwave equipment, associated with all of it.

The guys used to do that to prove that the ovens weren't really all that
well insulated, but I always wondered if there was another reason that
might happen.

Thinking about that, the front has a pierced panel that blocks radiation at
around 2.5 gigahertz, however the cell phone runs at around 800 MHz so it's
possible enough of that frequency will leak through to make it work.

It goes the other way: To get through the holes, the frequency would
need to be much higher than 2450 MHz.

The rule of thumb is that the wavelength of the radiation in question
must fit into a hole in the metal sheet. The higher the frequency, the
shorter the wavelength. The relevant equation is that the product of
frequency and wavelength equals the speed of light.

So, for 2450 MHz: (2450*10^6)(wavelength)=3*10^8 meters/second, so
wavelength= 0.122 meters, or 4.8 inches diameter. Actually, there will
be significant energy leaking through if a half wavelength fits, so the
issue really starts at about 2.4 inches. The cutoff function is
complicated near one wavelength.

Joe Gwinn

 

[Joseph Gwinn]

In article <pBlve.5142$dY1.3431@trnddc06>,
"James Sweet" <jamessweet@hotmail.com> wrote:

One time we were sending a bunch of CRT's back to the manufacturer for
proof-of- replacement one time, and my wife was labelling them. She
was wearing a knitted sweater, and the sleeve brushed against the 2nd
anode. She wasn't pleased with the result. The CRT had been sitting
for weeks to months...

Tom

A CRT that's not connected to the HV lead won't have any path to ground to
bleed the charge off, it'll pick up static from the air over time.

The issue with CRTs is that the glass dielectric, having been kept at
many tens of kilovolts for years, will store charge deep in the glass,
and this charge cannot be eliminated quickly. The phenomena is called
"dielectric adsorption" or "soakage". One can short such a CRT for a
week, remove the short, and see the voltage magically spring back. So
leave it shorted.

Big capacitors can do this as well, especially the big oil-paper
capacitors used in HV power supplies. These can store a lethal jolt.

This same phenomena is used in Electret microphones, where a thin layer
of teflon stores the HV charge needed to make the microphone work.

Joe Gwinn

 

[Tom MacIntyre]

On Sun, 26 Jun 2005 00:06:57 +0000 (UTC), Christopher Tidy
<cdt22NOSPAM@cantabgold.net> wrote:

Tom Miller wrote:

"Christopher Tidy" <cdt22NOSPAM@cantabgold.net> wrote in message
news:42BCB240.8000003@cantabgold.net...

JohnM wrote:


I've never considered pissing all over myself to be a lucky thing..



I think the alternative is having your heart stop from the shock.

A


How about if I just don't put my tongue on electrical stuff, then I
won't have to be thankful for pissing myself;-)

I think I just don't ever want to be thankful for that..

A while back I read in a tabloid about a man who had a nasty accident
after he left a bar drunken in the early hours. He was walking home with
a few mates when he needed to relieve himself. His mates dared him to
pee off the parapet of a railway bridge, which he did. Apparently his
stream of urine hit the 25 kV overhead wire which supplied the trains,
and he had a difficult job explaining the situation to a doctor at the
hospital when he came to.

That concept has been checked out by "Mythbusters" and found to be
essentially a myth.
Never the less I would check the direction before pointing.

I suspected so. I imagine that if you peed from a height of more than a
few feet, the stream of urine would break up into droplets and would not
form the necessary conductive path. Still, I wouldn't want to try it
with 25 kV.

Chris

What is the arc distance for dry air, 12kV per inch or something like
that? I definitely wouldn't be trying it with 25kV.

Tom

 

[Tom MacIntyre]

On Sat, 25 Jun 2005 19:13:16 GMT, "Angrie.Woman"
<Angrie.Woman@ggmail.com> wrote:

NSM wrote:
"Tom MacIntyre" <tom__macintyre@hotmail.com> wrote in message
news:r10rb1dtko3pn7v4dvogr7082runus0d1r@4ax.com...


True...PC monitors seem to be a different story, in my experience.


And I'm mighty cautious of microwave ovens.


I have a question. If I put a cellphone in a microwave oven, close the
door, call the number....should it ring?

A

For my wife's Diplomat microwave oven and my Nokia cellular telephone,
the answer is yes.

Tom