Microwave oven

[Phil Allison]

Criminal troll tabb...@gmail.com wrote:

It would be sensible to say microwaves can electrocute people,

** Idiotic to say otherwise - you fool.


not so sensible to insist everyone, despite not knowing what skills they do or don't have, does not have the necessary skills to work with them.


** Insane crap.

You must KNOW the person has the knowledge, skill and necessary safety gear on hand. Plus they must not work alone.

Impossible to ascertain that via usenet so the only safe option is to advise against and offer no help.

It's not difficult, just need to know the issues/gotchas.

** Totally insane crap.

One needs to be trained on the proper precautions with microwaves ovens and USE them.

You are one dangerous fucking idiot.
----------------------------------



...... Phil

 

On Monday, 25 March 2019 01:13:16 UTC, Phil Allison wrote:

Criminal troll tabby wrote:



It would be sensible to say microwaves can electrocute people,


** Idiotic to say otherwise - you fool.

so we get abuse for agreeing with you lol

not so sensible to insist everyone, despite not knowing what skills they do or don't have, does not have the necessary skills to work with them.

** Insane crap.

You must KNOW the person has the knowledge, skill and necessary safety gear on hand. Plus they must not work alone.

Neither I nor you need know what skill Mr Doom has.


> Impossible to ascertain that via usenet so the only safe option is to advise against and offer no help.

There are people taking that tack on any subject. Thankfully some are more constructive.

It's not difficult, just need to know the issues/gotchas.

** Totally insane crap.

One needs to be trained on the proper precautions with microwaves ovens and USE them.

If you understand the gotchas & are sensible you're going to use them. We can't do more than that on usenet.


> You are one dangerous fucking idiot.

With respect you don't know what my working practices are with microwaves, which makes your statement a bit silly.


NT

 

[Cursitor Doom]

On Mon, 25 Mar 2019 05:06:04 -0700, tabbypurr wrote:

With respect you don't know what my working practices are with
microwaves, which makes your statement a bit silly.

See, you politely disagree with him and all you get in response is a load
of foul-mouthed abuse. As if that's really going to win people over! :-D




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[Cursitor Doom]

On Mon, 25 Mar 2019 05:06:04 -0700, tabbypurr wrote:

On Monday, 25 March 2019 01:13:16 UTC, Phil Allison wrote:

Impossible to ascertain that via usenet so the only safe option is to
advise against and offer no help.

There are people taking that tack on any subject. Thankfully some are
more constructive.

Funny, that. Phil has offered advice to all-comers over the years with
questions about how to fix mains-powered appliances which of course CAN
also kill if you don't know what you're doing. So there you have it: more
proof he doesn't even follow his *own* advice! :-D



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[John-Del]

On Monday, March 25, 2019 at 11:29:52 AM UTC-4, Cursitor Doom wrote:

On Mon, 25 Mar 2019 05:06:04 -0700, tabbypurr wrote:

On Monday, 25 March 2019 01:13:16 UTC, Phil Allison wrote:

Impossible to ascertain that via usenet so the only safe option is to
advise against and offer no help.

There are people taking that tack on any subject. Thankfully some are
more constructive.

Funny, that. Phil has offered advice to all-comers over the years with
questions about how to fix mains-powered appliances which of course CAN
also kill if you don't know what you're doing. So there you have it: more
proof he doesn't even follow his *own* advice! :-D

The difference is everyone knows that mains inputs will kill, but most people are unaware of just how dangerous a microwave is compared to any other plug in appliance around the home.

"The U.S. Consumer Product Safety Commission reports that four people are electrocuted each year trying to repair their microwave ovens."

https://www.richmond.com/news/man-dies-while-fixing-microwave/article_ee48c2ac-0128-5530-b7c3-4c7a1c3ff15a.html

 

[Cursitor Doom]

On Fri, 22 Mar 2019 14:18:03 -0700, tabbypurr wrote:

Likely candidates are the HV diode & HV fuse. Of course it can be other
things. And of course they're in the killer section.

Spot on. Blown 5kV fuse and HV diode open circuit both directions.
Transformer secondary showing 188 ohms across the winding, so *hopefully*
a quick fix. But I'd better just check the magnetron first.......
:-/





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[Fox's Mercantile]

On 3/25/19 11:15 AM, John-Del wrote:

The difference is everyone knows that mains inputs will kill, but most people are unaware of just how dangerous a microwave is compared to any other plug in appliance around the home.

"The U.S. Consumer Product Safety Commission reports that four people are electrocuted each year trying to repair their microwave ovens."

https://www.richmond.com/news/man-dies-while-fixing-microwave/article_ee48c2ac-0128-5530-b7c3-4c7a1c3ff15a.html

Ya-but.
How many people die from accidents with guns?
Drunk driving.
Trying to make "jack ass" videos for you tube?

Considering the number of microwave ovens out there,that's a
pretty low death rate.

The best advice you can give about working on micro wave ovens
is:
The voltages, and the components that use/store them are lethal.
In the words of Sgt. Phil from Hill Street Blues, "Let's be
careful out there."


--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com

 

[pfjw@aol.com]

On Monday, March 25, 2019 at 12:15:29 PM UTC-4, John-Del wrote:

The difference is everyone knows that mains inputs will kill, but most people are unaware of just how dangerous a microwave is compared to any other plug in appliance around the home.

"The U.S. Consumer Product Safety Commission reports that four people are electrocuted each year trying to repair their microwave ovens."

https://www.richmond.com/news/man-dies-while-fixing-microwave/article_ee48c2ac-0128-5530-b7c3-4c7a1c3ff15a.html

Some opinions here:

Tabby would try the patience of Job, and is no more right, nor wrong than Phil on a general basis. Which is damned with faint praise, if ever there were.

Phil, were he to behave "at home" as he does "away" on this group would be, rapidly, rendered incapacitated, probably on a permanent basis. There is some significant pathology going on there, rendering Phil a figure to be pitied.

I am as good with invective and vituperation as the next guy, here, and seldom find the need to use vulgarity. But, Phil is one sort of special case, being as that is all he has. And Tabby is another sort of special case, as he *must* find the exceptional case for everything. Which, at the very least, gets tiresome.

Peter Wieck
Melrose Park, PA

 

[John-Del]

On Monday, March 25, 2019 at 12:38:49 PM UTC-4, Fox's Mercantile wrote:

On 3/25/19 11:15 AM, John-Del wrote:

The difference is everyone knows that mains inputs will kill, but most people are unaware of just how dangerous a microwave is compared to any other plug in appliance around the home.

"The U.S. Consumer Product Safety Commission reports that four people are electrocuted each year trying to repair their microwave ovens."

https://www.richmond.com/news/man-dies-while-fixing-microwave/article_ee48c2ac-0128-5530-b7c3-4c7a1c3ff15a.html


Ya-but.
How many people die from accidents with guns?
Drunk driving.

In fairness, pretty much all guns are handled at some point, and a LOT of people drive drunk daily. And like mains voltages, pretty much everyone knows guns and drunk driving are and is dangerous. Really, how many people take apart their microwaves? Gotta be a tiny percentage I would think.

Trying to make "jack ass" videos for you tube?

Cripes Jeff, I make one Jack Ass video and you won't let me live that down. No more shares for you.

 

[Look165]

The only guilty part can be : mains transtormer, HV diode and HV capacitor.
A magnetron never dies.
A HV diode cannot be checked with standard tools.
The best is to check the HV at the cap (take care to your hands).
It must be some 10 kV or more.
For heating, refer to your control board.


Cursitor Doom a Êcrit le 22/03/2019 à 20:37 :

Hi all,

I have had the same Daewoo microwave oven since I bought it new 7 years
ago and it's always performed *perfectly* up until today. This morning I
stuck some bread in it to defrost and it came out still frozen. No trace
of any heat at all. The platter rotates, the light comes on, the timer
counts down, the fan runs; all is working fine except for the total
absence of heat.
I'm given to understand that microwave ovens typically have a working
life of only around 2 years nowadays, so I'd really like to fix this one
up rather than replace it with something inevitably inferior. Any
suggestions as to what to check for? I have the gear to measure up to
50kV if necessary, and I'd guess the magnetron HT is considerably less
than that figure. So... where to start looking first?

 

[Ralph Mowery]

In article <q7avuk$u4q$1@dont-email.me>, curd@notformail.com says...

Likely candidates are the HV diode & HV fuse. Of course it can be other
things. And of course they're in the killer section.

Spot on. Blown 5kV fuse and HV diode open circuit both directions.
Transformer secondary showing 188 ohms across the winding, so *hopefully*
a quick fix. But I'd better just check the magnetron first.......
:-/

What did you use to check the diode ? Many of the high voltage diodes
are actually several in series in the same package. Most meters will
not check them as there are several volts dropped across them.
The meters will often show them as open in both directions evenif they
are good.

 

A magnetron never dies.

say what?

the filament can open.

m

 

[three_jeeps]

On Monday, March 25, 2019 at 12:34:31 PM UTC-4, Cursitor Doom wrote:

On Fri, 22 Mar 2019 14:18:03 -0700, tabbypurr wrote:

Likely candidates are the HV diode & HV fuse. Of course it can be other
things. And of course they're in the killer section.

Spot on. Blown 5kV fuse and HV diode open circuit both directions.
Transformer secondary showing 188 ohms across the winding, so *hopefully*
a quick fix. But I'd better just check the magnetron first.......
:-/





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Aside from sprinkling bits of technical troubleshooting and safety advice in a string of email exchanges, I was reminded of this comprehensive 'Microwave repair' document. Should be read and understood before one even unplugs the device to be repaired.

(When one considers that the charge stored in the microwave capacitor is significantly (x10+) the charge from public defibrillators (AEDs) the energy is definitely high enough to put a human being horizontal - permanently!)

https://www.repairfaq.org/sam/micfaq.htm#micpre

j

 

[Fox's Mercantile]

On 3/25/19 11:47 AM, John-Del wrote:

Cripes Jeff, I make one Jack Ass video and you won't let me live that down. No more shares for you.

Bwahahaha


--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com

 

[Jeff Liebermann]

On Mon, 25 Mar 2019 13:20:41 -0400, Ralph Mowery
<rmowery28146@earthlink.net> wrote:

In article <q7avuk$u4q$1@dont-email.me>, curd@notformail.com says...

Likely candidates are the HV diode & HV fuse. Of course it can be other
things. And of course they're in the killer section.

Spot on. Blown 5kV fuse and HV diode open circuit both directions.
Transformer secondary showing 188 ohms across the winding, so *hopefully*
a quick fix. But I'd better just check the magnetron first.......
:-/

What did you use to check the diode ? Many of the high voltage diodes
are actually several in series in the same package. Most meters will
not check them as there are several volts dropped across them.
The meters will often show them as open in both directions evenif they
are good.

Yep. The normal "diode check" found on most meters doesn't work. I
usually get about 100Kohms in the forward direction and infinity in
the reverse on my Simpson 260 meter (which uses a 15v battery for the
high resistance scales):
<https://www.partselect.com/Microwave+test-diode+repair.htm>

Or, use a 9V battery
<https://www.youtube.com/watch?v=1pp4LUrq4DM>
<https://www.youtube.com/watch?v=F1mTElvwcBg>
<https://www.youtube.com/watch?v=R7wpRRU8vEY>

If the microwave oven doesn't kill you, perhaps the popcorn will?
"Man shocked to death by exploding microwave"
<https://www.news24.com/World/News/man-shocked-to-death-by-exploding-microwave-20181109>
Please remember that you have only one life to give to your hobby or
profession.

--
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

 

[Cursitor Doom]

On Mon, 25 Mar 2019 10:45:35 -0700, makolber wrote:

A magnetron never dies.


say what?

the filament can open.

There are two (safe) checks to test a magnetron: resistance between pins
both ways round should be less than 1ohm and resistance between each pin
and the 'tron case should be open-circuit.




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[Cursitor Doom]

On Mon, 25 Mar 2019 13:20:41 -0400, Ralph Mowery wrote:

What did you use to check the diode ? Many of the high voltage diodes
are actually several in series in the same package. Most meters will
not check them as there are several volts dropped across them.
The meters will often show them as open in both directions evenif they
are good.

I used a 9v battery and just checked for low-res one way and high-res the
other. Totally dead in both directions.





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[Look165]

You cannot check a HV diode.
The only way for a microwave is to chek the HV at the cap, and the
filament some 10 A.

Cursitor Doom a Êcrit le 25/03/2019 à 21:52 :

On Mon, 25 Mar 2019 13:20:41 -0400, Ralph Mowery wrote:

What did you use to check the diode ? Many of the high voltage diodes
are actually several in series in the same package. Most meters will
not check them as there are several volts dropped across them.
The meters will often show them as open in both directions evenif they
are good.
I used a 9v battery and just checked for low-res one way and high-res the
other. Totally dead in both directions.

 

[Cursitor Doom]

On Mon, 25 Mar 2019 21:55:27 +0100, Look165 wrote:

> You cannot check a HV diode.

I just have! Maybe it's YOU who has a problem with them?



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[Phil Allison]

tabb the criminal moron troll ...@gmail.com wrote:

It would be sensible to say microwaves can electrocute people,


** Idiotic to say otherwise - you fool.

so we get abuse for agreeing with you lol

** We do not agree on anything.

not so sensible to insist everyone, despite not knowing what skills they do or don't have, does not have the necessary skills to work with them.

** Insane crap.

You must KNOW the person has the knowledge, skill and necessary safety gear on hand. Plus they must not work alone.

Neither I nor you need know what skill Mr Doom has.

** Irrelevant to you posting bad advice on a public forum which anyone can read at any time.

Impossible to ascertain that via usenet so the only safe option is to advise against and offer no help.

There are people taking that tack on any subject.

** Completely irrelevant garbage.

A false argument of the dumbest kind.

It's not difficult, just need to know the issues/gotchas.

** Totally insane crap.

One needs to be trained on the proper precautions with microwaves ovens and USE them.

If you understand the gotchas & are sensible you're going to use them. We can't do more than that on usenet.

** Dangerous drivel.

Erring on the side of caution is a foreign concept to a raving fuckwit like you.

You are one dangerous fucking idiot.


With respect you don't know what my working practices are with microwaves,

** Utter and COMPLETELY irrelevant, I was NOT talking about your or CD practices !!!!

The danger is of course to folk reading you fucking tripe on this NG.


FYI:

You have a monstrous reading disability along with rampant autism and a bloated and diseased ego.

Plus you are a vile coward hiding behind a fake name and complete anonymity.

Fuck you.


..... Phil