Toshiba TV29C90 problem; Image fades to black...

[Ken Weitzel]

spongehead wrote:

I have an old Briggs and Stratton 3.5hp push behind lawnmower and the
idle revvs up and down constantly. Never idles normal. The spring on
the shaft idle looks good. Any help on what this might be would be
greatly appreciated.

Hi...

Happens that I have one; as well as still have the manual...
hard to believe 'cause it's about 15 years old

Anyway, still runs perfectly, so I'd be happy to take a couple
of pics of the springs and carb linkage etc, and mail them to
you if you like?

Could also scan the applicable pages of the manual if you
think it would be helpful.

Take care.

Ken

 

[kip]

Carb KIT needed....

"spongehead" <hgoodale_msp@msn.com> wrote in message
news:1115833201.124477.209020@g49g2000cwa.googlegroups.com...

I have an old Briggs and Stratton 3.5hp push behind lawnmower and the
idle revvs up and down constantly. Never idles normal. The spring on
the shaft idle looks good. Any help on what this might be would be
greatly appreciated.

 

[Art]

Shorted Green CRT.
"junglee" <bhuva2@gmail.com> wrote in message
news:1115822681.147196.87050@g43g2000cwa.googlegroups.com...

Everything was working fine...then one day, TV stopped working. I
checked the circuit. Q404 was blown. Changed it. Turned the power
ON, it blew again - stupid me. After checking for other shorts, took
out all the CRT tube connections from ditstribution block. Changed
Q404. Nothing blew. Put in red tube, no problem. Connected blue
tube, no problem. Connected green tube, Q404 is shorted. Took out
green tube, changed Q404. TV worked fine. Picture is messed up as
green is missing but the video and audio otherwise is good.

Checked green yokes (how do you check them?) by switching them with
blue one (I always kept the green tube disconnected). No problems. So
that means yokes are fine, right? May be the distribution block has a
problem and can handle only two tubes at a time. Took out blue one and
only connected red and green. Same problem - blew Q404. Gave the
boards (only the signal board and the power board) to a friend. Who
hooked them up at his shop and said everything is working fine. The
only thing to do is to replace the green tube. Ordered one. Replaced
it. Turned the power on and the Q404 got shorted! By now, my supplier
is running out of Q404! And I am running out of ideas to test. So I
seek help. Obviously, there is something about green tube - are you
supposed to do something to the tube before you connect it?

What can be the problem? How do I test for it? What am I doing wrong?
Any help is appreciated.
Thanks

junglee

 

[Dave Plowman (News)]

In article <1115834384.004575.180400@o13g2000cwo.googlegroups.com>,
cnctut <cnctutwiler@wmconnect.com> wrote:

Any reliability issues concerning a new Sharp R-1540 microwave to power
it off a square wave inverter when camping? Is there any real
difference between "square wave" and "modified square wave" inverters?

You're into a fairly chunky invertor to power a decent microwave. And a
chunky battery to power it. Surely a gas or paraffin stove is much more
suitable for camping?

--
*Always borrow money from pessimists - they don't expect it back *

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

 

[Funfly3]

"cnctut" <cnctutwiler@wmconnect.com> wrote in message
news:1115852660.912002.175100@g14g2000cwa.googlegroups.com...

Dave--

The microwave is in an RV--I have multiple generators that would
work--just hate to start them for 2 minute popcorn or 60 sec hot tea.
Thought an inverter might be a quick solution--the RV has 2 D-8
batteries for DC power--1350 amp-hrs each.

Thanks

Tut
sounds like you have enough battery power but I have no idea which would be

better for a microwave

 

[quietguy]

I would guess that the carby needs cleaning, or the fuel filter is clogged

David

Bob Shuman wrote:

I agree that cleaning the air intake and replacing the filter may help. I'd
also suggest making sure the carburetor intake is clean and the mixture
adjustment is set properly.

Also make sure all the linkage spring are in place too.

If I had to guess, I'd say that the mixture may be too rich (or lean) and
the engine's governor is keeping it alive.

Good luck!

Bob

"cnctut" <cnctutwiler@wmconnect.com> wrote in message
news:1115833934.496322.150280@o13g2000cwo.googlegroups.com...

spongehead wrote:
I have an old Briggs and Stratton 3.5hp push behind lawnmower and the
idle revvs up and down constantly. Never idles normal. The spring
on
the shaft idle looks good. Any help on what this might be would be
greatly appreciated.


Spongehead--

Recommend cleaning the air intake sponge first then let us know if the
problem still exists. I assume you have the 99 dollar Walmart mower
with no variable throttle.

Tut

 

[Jim Yanik]

"cnctut" <cnctutwiler@wmconnect.com> wrote in
news:1115834384.004575.180400@o13g2000cwo.googlegroups.com:

Any reliability issues concerning a new Sharp R-1540 microwave to power
it off a square wave inverter when camping? Is there any real
difference between "square wave" and "modified square wave" inverters?

Thanks

Tut

Iron-core transformers do not like square waves-the harmonics just generate
excess heat in the core.You would need a hefty inverter to power the
average MW oven;they run about a kilowatt output(~15A@120VAC input),and
with an iron-core transformer,the startup surge would require more inverter
power.

"modified squarewave" inverters generate a stepped version of a sine
wave,reducing the harmonic output.

--
Jim Yanik
jyanik
at
kua.net

 

[Kim Sleep]

Oh...and by the way...I think that I was actually the one that called you a
Jackass.
And I have a update.....
Only a month until this Jackasses posting disappears from the top of my
list.

"Bob" <bobnospam1@softhome.net> wrote in message
news:q-CdnZ1V5aP21x_fRVn-vg@comcast.com...

"none" <Vampyres@nettaxi.com> wrote in message
OH... I see. Calling someone a jackass is just well meant advice.

And what part of "Get a better reader and learn how quoting works..."
calls
you a jackass?

Bob

 

[Matt J. McCullar]

First one on my list would be _Getting Started in Electronics_ by Forrest
Mims III. Radio Shack carried it, perhaps they still do. It's full-size
paperback. Not expensive, crammed full of practical knowledge. This is the
book that got me started in electronics and I cannot recommend it highly
enough.

Chances are you'll find some electronics books published by TAB at your
library. I recommend staying away from these. On the whole, they're not
bad, but they are almost always riddled with so many errors that you
literally cannot depend on what they say. They also really cut corners when
it comes to illustrations, making schematic diagrams so damned confusing
that they're utterly worthless.

Look for back issues of electronics hobby magazines and ham radio mags. You
can often find these by the boxful at hamfests.

 

[NSM]

"Jim Yanik" <jyanik@abuse.gov.> wrote in message
news:Xns9653C9AF41F01jyanikkuanet@129.250.170.84...

"cnctut" <cnctutwiler@wmconnect.com> wrote in
news:1115834384.004575.180400@o13g2000cwo.googlegroups.com:

Any reliability issues concerning a new Sharp R-1540 microwave to power
it off a square wave inverter when camping? Is there any real
difference between "square wave" and "modified square wave" inverters?

Iron-core transformers do not like square waves-the harmonics just
generate
excess heat in the core.You would need a hefty inverter to power the
average MW oven;they run about a kilowatt output(~15A@120VAC input),and
with an iron-core transformer,the startup surge would require more
inverter
power.

"modified squarewave" inverters generate a stepped version of a sine
wave,reducing the harmonic output.

An inverter microwave might work better since they rectify AC to DC.
--
N

 

[Art]

Need to remove the anode lead, clean the connection thoroughly, looking for
any carbon tracing on the outside of the glass envelope. Re-attach the anode
lead with sufficient sealant and let cure 24+ hours. If the carbon track has
been removed and the seal done properly you should have an operational
device. Actually the only way to check that is to subject it to the
application of operational voltages and currents.
"junglee" <bhuva2@gmail.com> wrote in message
news:1115857987.687165.159560@g14g2000cwa.googlegroups.com...

David,

You are correct as always! (I have been watching this news group and am
really impressed with your insights!) I did not do what you just
described. I did not allow 24 hours for curing. Now the main question
I have is - did I ruin the CRT? I am going to seal the hv lead and
allow it to cure for 24 hours. Is there anyway for me to test the CRT?
Is it too late?
Thanks.

junglee

dkuha...@locl.net wrote:
Sounds like the new tube did not get the new hv lead properly
attached
and sealed to the tube and allowed to cure a minimum of 24 hours
before
applying HV.

 

[Bob]

Interesting that you say you previously called me a jackass when the post
you just responded to was the first I made. Do you have any idea how usenet
threads work?

Bob

"Kim Sleep" <ksleep@sympatico.ca> wrote in message
news:gjxge.32059$XX1.612906@news20.bellglobal.com...

Oh...and by the way...I think that I was actually the one that called you
a
Jackass.
And I have a update.....
Only a month until this Jackasses posting disappears from the top of my
list.

"Bob" <bobnospam1@softhome.net> wrote in message
news:q-CdnZ1V5aP21x_fRVn-vg@comcast.com...

"none" <Vampyres@nettaxi.com> wrote in message
OH... I see. Calling someone a jackass is just well meant advice.

And what part of "Get a better reader and learn how quoting works..."
calls
you a jackass?

Bob

 

[Sam Goldwasser]

"spongehead" <hgoodale_msp@msn.com> writes:

I have an old Briggs and Stratton 3.5hp push behind lawnmower and the
idle revvs up and down constantly. Never idles normal. The spring on
the shaft idle looks good. Any help on what this might be would be
greatly appreciated.

Depending on the model, there may be an idle adjustment, but as
others have said, the carb either may need cleaning or a refurb.

--- 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.

 

[Ol' Duffer]

In article <1115833201.124477.209020@g49g2000cwa.googlegroups.com>,
hgoodale_msp@msn.com says...

I have an old Briggs and Stratton 3.5hp push behind lawnmower and the
idle revvs up and down constantly. Never idles normal. The spring on
the shaft idle looks good. Any help on what this might be would be
greatly appreciated.

The speed control servo on these does not have much phase
margin, and may even have a pole in the right half plane.
Fuel mixture errors can easily add enough loop delay to
push the system into oscillation. Accumulation of gum and
varnish and the tendency of the carburetors's soft metal
to flow with age and develop leaky gaskets all contribute
to long-term performance drift.

In layman's terms; adjust, repair, or replace the carburetor
as needed. A professional who works on these often enough
to be familiar should be able to diagnose your specific
needs in very short order, but will probably expect to be
paid for his expertise.

 

[NSM]

"cnctut" <cnctutwiler@wmconnect.com> wrote in message
news:1115859750.527222.200140@o13g2000cwo.googlegroups.com...

NSM--isn't there some 120vac in the microwave unit somewhere--AC fans,
motors, etc?

Sure, but they're shaded pole motors - should be OK.
--
N

 

[DaveM]

"fortunoy" <cliff150@hotmail.com> wrote in message
news:1115862799.276275.129520@g44g2000cwa.googlegroups.com...

Sanyo DS19380

When running the menu search for channels menu says "no signal from
antenna." "check connections."

have swapped this tv with other tv that has no problem so the problem
is with this tv.

when this problem first started, I found that to leave the tv turned on
for like 10 minutes, the tv would start playing a good picture. Now
the tv will not come on at all.

help.

Sounds from your description that you're not really knowledgeable enough
about the innards of a TV to go plundering around inside. It's time for a
trip to the TV shop for a repair or to Wal-Mart for a new TV.

--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)

Never take a laxative and a sleeping pill at the same time!!

 

[Joel Kolstad]

"cnctut" <cnctutwiler@wmconnect.com> wrote in message
news:1115862740.095976.169750@z14g2000cwz.googlegroups.com...

Thanks--I got off my lazy kester and did a google and found the wave
shape for a modified square wave inverter. Appreciate your input.

A modified sine wave doesn't have a 3rd harmonic, and the idea is that
eliminating is goes a long way towards reducing overheating in transformers
(since the higher the harmonic, the more it's naturally surpressed from the
core's self inductance).

---Joel Kolstad

 

[NSM]

<michael.w.appenzeller@lmco.com> wrote in message
news:1115870922.509282.157070@g47g2000cwa.googlegroups.com...

I'm working on a Pioneer VSX-454 that has a shorted 2SA1302/2SC3281
output pair. I've been reading that there is a big problem with
counterfeits of these transistors. Does anyone who does a lot of
audio repairs have either 1: a reliable source for these transistors,
or 2: good substitute part numbers?

Pioneer has them, but they want $18 for the 2SA and $16 for the 2SC.
This would make the repair too expensive, since these (and the bias
transistor) blew while bench testing after fixing the original fault.

http://members.tripod.com/nanhifi/hasib02.htm

???

N

 

[JR North]

SWMBO hot glued the handle on my Delonghi Latte machine. Not perfect,
but works with a little manual english on the handle.
JR

he_truth_nothing_but@yahoo.com wrote:

Purchased a Krups coffee maker less than a year ago. The handle on the
stainless steel carafe is coming off. Anyone in this group ever repair
one successfully? If yes, how do I go about this? Thanks!

--
--------------------------------------------------------------
Home Page: http://www.seanet.com/~jasonrnorth

 

[Franc Zabkar]

On 11 May 2005 15:44:08 -0700, "gstringe" <egnirts@comcast.net> put
finger to keyboard and composed:

Viewsonic P220f still on it but flying in the dark with no
schematic.QH07 and QH08 are a complementary pair in the horiz ckt and
attached to each other but since removing them and marking them I am
having second thoughts of whether I put them back correctly. Anyone
have a schematic that they could look at for me. They are BD140 and
BD139 transistors.
Many thanks

I'm not familiar with your monitor, but are you sure this transistor
pair is part of the horizontal circuit? I normally see such
arrangements in the vertical output of old TV sets. Either way, I
expect the BD139 (NPN) to connect to the positive rail, and the BD140
(PNP) to connect to ground or negative rail. Are the two emitters and
bases tied together?

Follow the direction of current flow in the external circuit. Current
flows from E to C in a PNP transistor, and from C to E in an NPN
transistor. Transistor pinouts are BCE in both cases.


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.