Toshiba TV29C90 problem; Image fades to black...

[Paul Burridge]

On Tue, 03 Jan 2006 01:25:10 GMT, Ignoramus16356
<ignoramus16356@NOSPAM.16356.invalid> wrote:

When would I need two scopes? What kind of practical situation? I am
not desperate for money, but I am short of space. I am open minded
regareing this issue.

If you part with that 475, then sooner or later you'll be very, very,
very sorry.
--

"What is now proved was once only imagin'd" - William Blake

 

[Ignoramus29795]

On Tue, 03 Jan 2006 20:53:01 +0100, Paul Burridge <pb@shove.your.spam.up.your.arse.atlanticstar.co.uk> wrote:

On Tue, 03 Jan 2006 01:25:10 GMT, Ignoramus16356
ignoramus16356@NOSPAM.16356.invalid> wrote:


When would I need two scopes? What kind of practical situation? I am
not desperate for money, but I am short of space. I am open minded
regareing this issue.

If you part with that 475, then sooner or later you'll be very, very,
very sorry.

I changed my mind. I will not sell my 475.

Now... I have little interest in homemade radio or audio stuff. So far
my little forays into electronics centered around power electronics.
Given that... Is there any possible reason to keep a spectrum
analyzer?

i

 

[Richard Henry]

"Ignoramus29795" <ignoramus29795@NOSPAM.29795.invalid> wrote in message
news:BEBuf.1497$1_1.725@fe67.usenetserver.com...

On Tue, 03 Jan 2006 20:53:01 +0100, Paul Burridge
pb@shove.your.spam.up.your.arse.atlanticstar.co.uk> wrote:
On Tue, 03 Jan 2006 01:25:10 GMT, Ignoramus16356
ignoramus16356@NOSPAM.16356.invalid> wrote:


When would I need two scopes? What kind of practical situation? I am
not desperate for money, but I am short of space. I am open minded
regareing this issue.

If you part with that 475, then sooner or later you'll be very, very,
very sorry.

I changed my mind. I will not sell my 475.

Now... I have little interest in homemade radio or audio stuff. So far
my little forays into electronics centered around power electronics.
Given that... Is there any possible reason to keep a spectrum
analyzer?

Emissions compliance testing.

 

[Steven Swift]

"John-Del" <ohger1s@aol.com> writes:

I have used a 7603 for about 15 years for general troubleshooting, and
it's my favorite scope. It's rock solid, and bright and sharp. I
haven't been able to find a horiz plug-in with TV sync, but the trigger
is so good I can get it to lock on video anyway. Only problems are the
huge Mallory capacitors in the power supply that will open without
warning. Replace all of these and you'll have no trouble at all.

John

The 7603 is very nice. I use them for the spectrum analyser plug-ins as
the bigger CRT helps. But for normal trouble shooting, I much prefer the
7704A as the basic scope. The same plugins work, but you get a bit more
bandwidth-- up to 200MHz and the fourth slot lets you do some interesting
things with delaying timebases.

For smaller units, I prefer the 475. Nice and solid.

To complement the Tek 3052B digital scopes, I use 7904 with high speed
plugins (like 7A19 and 7B92). The 7904 is the stand for the 3052B.

I use SC502 and SC504 in the TM500 racks when I want to watch something on
the bench without taking up space.

Steve
--
Steven D. Swift, novatech@eskimo.com, http://www.novatech-instr.com
NOVATECH INSTRUMENTS, INC. P.O. Box 55997
206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA

 

[Highland Ham]

Now... I have little interest in homemade radio or audio stuff. So far
my little forays into electronics centered around power electronics.
Given that... Is there any possible reason to keep a spectrum
analyzer?


Emissions compliance testing.

Yes indeed that's is very good purpose if for a spectrum analyser

A long time ago I purchased (in the UK) a spectrum probe useful between
LF and 90 MHz meant for EMC testing in conjunction with a (if you wish
as low as 1 MHz) oscilloscope. I find it a very useful instrument for
homebrewing HF equipment ,although it is of course not a complete
spectrum analyser .

Frank KN6WH / GM0CSZ

 

[Noone]

John Crighton wrote:

On Mon, 02 Jan 2006 20:21:03 +0100, Paul Burridge
pb@shove.your.spam.up.your.arse.atlanticstar.co.uk> wrote:

I came across this on the 'net, which may or may not be useful in your
particular case, John...

Hello Paul,
thanks very much for sharing those gems.
I have stored them away.

I had a good laugh at your dining room table
centre piece admisssions and the follow up doily
and scope cosy remarks. Heh Heh heh.....

I must admit when I first got my 465 I just couldn't
keep my hands off it and I had it covered up with
a tea towel in between playing with it.

When you have lusted after something for decades
and you finally get it. Oh what a feeling!

Regards,
John Crighton
Sydney

Now in my mid 50's, I am reminded of something my father said. He had
always said, that ever since 1957 , he wanted a Cadillac. In the later
years of his life, hefinally got his wish - he bought a 1957 Cadillac.

For years I have been collecting and restoring the iconic untouchables of
my early days in Engineering. Scopes are like boats, you can never have
too many. But they are useful. My particular weakness has been the HP
141T family of Spectrum Analyzers. What was 20K + then, is now cheap.
Winter nights are spent re-Cap-ing, calibrating, and restoring these
remnants of the last great Analog Spectrum Analyzer.

Like restoring the automobiles of one's youth, these are tangible links to
our own past. Any good tool, kept in working condition is valuable. To
see these Cadillacs of the past brought back to their former glory is
reward enough.

As John said so well, Oh what a feeling!

Blakely

Blakely LaCroix
Minneapolis, Minnesota.
USA

 

[qrk]

On Tue, 03 Jan 2006 01:25:10 GMT, Ignoramus16356
<ignoramus16356@NOSPAM.16356.invalid> wrote:

On Tue, 03 Jan 2006 00:48:55 GMT, qrk <SpamTrap@spam.net> wrote:
On Sun, 01 Jan 2006 22:04:57 GMT, Ignoramus32654
ignoramus32654@NOSPAM.32654.invalid> wrote:

I will sell the 475 though, two scopes is too much.

Don't you mean "not enough"? Two is sort of a minimum working level. 3
or 4 is nice to have! Can't beat the 465, 475, and 7000 series. Also
use the 305x series when I need storage, math, or documenation.

When would I need two scopes? What kind of practical situation? I am
not desperate for money, but I am short of space. I am open minded
regareing this issue.

i

1. As others have said, when you need to fix your other scope. My 465
just took a dump a couple weeks ago. Used the 475 to troubleshoot it.
One of the HV ceramic caps has excess leakage At least it's a
replaceable part.

2. It's also nice to have a spare when the other scope goes down.

3. Sometimes you just need two scopes to do the job, especially when
your project is divided up between two racks of equipment.

4. Sometimes you need multiple scopes because your events are
asynchronous.

5. Some scopes are better at doing certain tasks like those nifty
microchannel plate intensified scopes.

6. Sometimes you have multiple projects going and it's nice not having
to disassemble your test setup.

7. You may have a 7000 mainframe, but need a portable scope like the
465.

8. It's also nice to have a modern digital scope for slow events, math
functions, and documentation. But, keep those analog scopes around as
they convey more information about the signal at a glance than any
digital scope I've used.

You also mentioned something about spectrum analyzers. Extremely handy
for certain types of work. Depending on the anlyzer, they are great
for characterizing filters, amplifiers, noise in low-level amplifiers,
EMI issues, unwanted oscillations, impedance, and a host of other
things.

---
Mark

 

On Tue, 03 Jan 2006 21:10:15 -0800, cover
<coverlandNOSPAM914@yahoo.com> wrote:

We have a big screen TV that has suddenly gone on the fritz a couple
of days ago.

It plays fine on channels 6 & 7 out of all available cable channels,
the picture is there and looks fine except for those two channels, a
'snowy' sound exists on anything but channel 6 or 7.

It even is this way when playing back tapes or DVDs through our player
when on channel 3, etc..

Does this sound familiar to anyone? My wife indicated today that on
one occasion, one of the channels was playing pretty clear albeit in
spanish with the commercials coming through in english. Weird as
heck.

Seems like a cable issue although the fact that we can't place the TV
onto channel 3 and play VCR movies or DVDs okay seems suspiciously
like a television problem.

Any ideas?.

Does the TV have any inputs other than the cable, and if so what
happens when you try playing the VCR thru those inputs?

 

[Too_Many_Tools]

"Now in my mid 50's, I am reminded of something my father said. He had

always said, that ever since 1957 , he wanted a Cadillac. In the
later
years of his life, hefinally got his wish - he bought a 1957 Cadillac.


For years I have been collecting and restoring the iconic untouchables
of
my early days in Engineering. Scopes are like boats, you can never
have
too many. But they are useful. My particular weakness has been the HP

141T family of Spectrum Analyzers. What was 20K + then, is now cheap.
Winter nights are spent re-Cap-ing, calibrating, and restoring these
remnants of the last great Analog Spectrum Analyzer.


Like restoring the automobiles of one's youth, these are tangible links
to
our own past. Any good tool, kept in working condition is valuable.
To
see these Cadillacs of the past brought back to their former glory is
reward enough.


As John said so well, Oh what a feeling!


Blakely


Blakely LaCroix
Minneapolis, Minnesota.
USA "

Well said.

TMT

 

[Litzendraht]

Does anyone remember the "Jetronics" knockoffs of the Tektronix
'scopes?

When I was going to Army radar school in 1966 / 67, We used a Jetronics
545A (I think that's right).

The Jet was fine for school. Triggered sweep and good to at least 30
Mhz. Before I was drafted, all I had at home was a Simpson
"Handiscope". Rated to 100 Khz, but would see a 262 kc. IF signal.

It's comforting to know that once I was assigned permanent duty at an
Army missile site, all we used were Tektronix and Hickok 'scopes.

John

 

[Rube]

Hi

Caig has DeOxit in 5% and 100% formula,
the 5% works most of the time.
You can get it in standard aerosol (hazmat ship fee ups)
or the pump can D5P (no hazmat fees)
www.caig.com

www.mcmelectronics.com has it in stock

If the switch wafers really are bad, the easiest thing to do is to use
Cramolin with a very long spray tube. You can get it into very small
places without having to do as much dissasembly. But make sure the
contacts are tight, first. I don't see contact cleaning needed on
the scopes of this era, although some of the older ones did.
--scott

 

[Rube]

DeOxit is standard issue for Xerox service staff,
our service lady told me about it, she is also
a amateur radio operator like me.

 

[Gary Schafer]

Hi Blakely

I would like to correspond with you on some problems with a 141T.

My email is garyschafer@comcast.net.

Thanks
Gary K4FMX


On Wed, 04 Jan 2006 01:11:53 GMT, Noone <Noone@wrenchman.com> wrote:

Now in my mid 50's, I am reminded of something my father said. He had
always said, that ever since 1957 , he wanted a Cadillac. In the later
years of his life, hefinally got his wish - he bought a 1957 Cadillac.

For years I have been collecting and restoring the iconic untouchables of
my early days in Engineering. Scopes are like boats, you can never have
too many. But they are useful. My particular weakness has been the HP
141T family of Spectrum Analyzers. What was 20K + then, is now cheap.
Winter nights are spent re-Cap-ing, calibrating, and restoring these
remnants of the last great Analog Spectrum Analyzer.

Like restoring the automobiles of one's youth, these are tangible links to
our own past. Any good tool, kept in working condition is valuable. To
see these Cadillacs of the past brought back to their former glory is
reward enough.

As John said so well, Oh what a feeling!

Blakely

Blakely LaCroix
Minneapolis, Minnesota.
USA

 

[b]

reply@to.group wrote:

On Tue, 03 Jan 2006 21:10:15 -0800, cover
coverlandNOSPAM914@yahoo.com> wrote:

We have a big screen TV that has suddenly gone on the fritz a couple
of days ago.

It plays fine on channels 6 & 7 out of all available cable channels,
the picture is there and looks fine except for those two channels, a
'snowy' sound exists on anything but channel 6 or 7.

It even is this way when playing back tapes or DVDs through our player
when on channel 3, etc..

Does this sound familiar to anyone? My wife indicated today that on
one occasion, one of the channels was playing pretty clear albeit in
spanish with the commercials coming through in english. Weird as
heck.

Seems like a cable issue although the fact that we can't place the TV
onto channel 3 and play VCR movies or DVDs okay seems suspiciously
like a television problem.

Any ideas?.

sounds like a problem in the IF module. Coils may need a tweak.
-B

 

[Rod Speed]

b <reverend_rogers@yahoo.com> wrote:

reply@to.group wrote:
On Tue, 03 Jan 2006 21:10:15 -0800, cover
coverlandNOSPAM914@yahoo.com> wrote:

We have a big screen TV that has suddenly gone on the fritz a couple
of days ago.

It plays fine on channels 6 & 7 out of all available cable channels,
the picture is there and looks fine except for those two channels, a
'snowy' sound exists on anything but channel 6 or 7.

It even is this way when playing back tapes or DVDs through our
player when on channel 3, etc..

Does this sound familiar to anyone? My wife indicated today that on
one occasion, one of the channels was playing pretty clear albeit in
spanish with the commercials coming through in english. Weird as
heck.

Seems like a cable issue although the fact that we can't place the
TV onto channel 3 and play VCR movies or DVDs okay seems
suspiciously like a television problem.

Any ideas?.

sounds like a problem in the IF module. Coils may need a tweak.

Unlikely given that a couple of the channels are fine.

Bet its just got set to the spanish audio

 

[P.K.]

You mean you don't want to hear Ralph shaving Howard's balls on the air ???

Tim Donohoe wrote:

Doc wrote:

Oh, Erich Schultheis wrote:

Why is it, that when somebody attacks Sirius its "because the singal
cuts out". Ever notice they don't attack Sirius because their
programming sucks?


excellent point. the programming is top notch.


Eh, they sould have signed Dylan. Programming on both is about the same
but the quality of the sound is Sirius's problem. I'd rather listen to a
decent sounding Imus to a crappy sounding Stern.

 

[Erich J. Schultheis, The]

P.K. wrote:

You mean you don't want to hear Ralph shaving Howard's balls on the air ???

I would rather hear Ralph shaving Howard's balls on the air than listen

to Anthony make a lame radio show with Opie's balls in his mouth.

 

[Armand]

In article <422pciF1grvlpU1@individual.net>, rod_speed@yahoo.com says...

b <reverend_rogers@yahoo.com> wrote:
reply@to.group wrote:
On Tue, 03 Jan 2006 21:10:15 -0800, cover
coverlandNOSPAM914@yahoo.com> wrote:

We have a big screen TV that has suddenly gone on the fritz a couple
of days ago.

It plays fine on channels 6 & 7 out of all available cable channels,
the picture is there and looks fine except for those two channels, a
'snowy' sound exists on anything but channel 6 or 7.

It even is this way when playing back tapes or DVDs through our
player when on channel 3, etc..

Does this sound familiar to anyone? My wife indicated today that on
one occasion, one of the channels was playing pretty clear albeit in
spanish with the commercials coming through in english. Weird as
heck.

Seems like a cable issue although the fact that we can't place the
TV onto channel 3 and play VCR movies or DVDs okay seems
suspiciously like a television problem.

Any ideas?.

sounds like a problem in the IF module. Coils may need a tweak.

Unlikely given that a couple of the channels are fine.

Bet its just got set to the spanish audio

Might your TV be set to SAP: Secondary Audio Channel? Since it's not always
used, you don't always hear it.

 

[Atsunori Tamagawa]

John Crighton wrote:

Half a dozen screws and the cover is off,
Pull two connectors and remove two or four
mounting screws and the hard drive is out.
I would call that easy.

I own some scopes. Though, my favorite is not one of Tek ones,
but HP-1741A storage scope.
Anyway, I realized that when I troubleshoot my scopes or fix
something with them, I always got extra screws left.
It is a bit annoying experience because I know those extra screw
were being used somewhere.
I think that test equipment are made of way too many extra screws.

Two years shy of forty years of age and the scope still
works. Bloody marvellous!

It's probably a matter of total operating time instead of
how old it is. I heard a story from an old analog engineer
saying that when storage scopes were new, they were
SO EXPENSIVE that you just couldn't keep them turned on,
but only when you need to take a vital measurement you were
allowed to turn it on.
If that is true, I think some old storage scopes are actually
bargains instead of to-be-avoied.

Switches in that environment

of damp and dust can't be expected to remain clean and
reliable. I am just amazed that my 454 scope works as well
as it does even with its dodgy switch.

I owned one 454, and later used one 454A. The 454 seemed to
comsume much more power than 454A. In winter, having the 454
closer was nice.

Atsunori

 

[Chuck Harris]

Atsunori Tamagawa wrote:

I own some scopes. Though, my favorite is not one of Tek ones,
but HP-1741A storage scope.

Hmmm? I cannot imagine what you like about the 1741A, but different
strokes for different folks.

Be very careful with that grey horizontal timing switch knob. HP cut two
(or was it 3?) slots that each cover 175 (115?) degrees through the body of the knob.
They did that so that you could see the light mounted on the panel through
the knob. Well, when the switch's lubrication gets a little sticky,
and you get a little enthusiastic (and lord knows the plastic is already
at least 18 years old), you will snap those thin little bits of plastic,
and your knob will be gone, and your scope will be unusable. Forget about
gluing it, as there was barely enough strength with the virgin plastic.

We had dozens of that family of HP scope, and they all went into scrap because
the knobs were unavailable.

Tektronix did the same thing with their horizontal knobs, but they
knew enough about materials engineering to make the body of the knob
out of aluminum, and make the grip surface of the knob out of plastic.

-Chuck