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Posted by GregS on October 15, 2009, 4:06 pm
>> no shorts between magnetron contacts or ground but when plugged it
>> does not heat the oven contents and has loud hum
>> Is it dead(how to make sure) or perhaps requires say 1v higher cathode
>> heating voltage than what transformer supplies?
>Could be a lot of things most are unsafe to test without proper
>equipment and experience. The voltages exceed that which can be safely
>handled by most voltmeters. Back when I used to work on these things
>the first things I would check is the diode, filament caps, power
>supply cap. I could do this safely with ohm meter and Hi-pot tester.
>I had a homebrew test bed for checking transformers, don't even think
>of measuring voltage on these even the filament are at multi kilovolt
>levels and grounded to the chassis. The decision to replace the maggie
>was usually based on a process of elimination.
I ran into that recently. It sort of started to work by generating heat,
but that didn't last long. I like using an old analog meter with the 5 KV scales.
I didn't get a chance to replace the manetron. It cost the owner a bunch for the
transformer
and diode.
The diode and transformer became BAD, but don't know at what point.
Before or after the manetron went bad.
greg
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Posted by HeyBub on October 15, 2009, 3:09 pm
abo mahab wrote:
> Belief in God by Shaikh Shahidullah Faridi
> It is mistakenly imagined by some that belief in a Supreme Being as
> the Creator and Controller of the universe is a mere emotional
> aspiration, a superstition of ancient times, irrational and illogical,
> and exploded by modern science....
I see you're posting from 93.98.28.228, which works out to be
IP address: 93.98.28.228
Reverse DNS: [No reverse DNS entry per ns-pri.ripe.net.]
Reverse DNS authenticity: [Unknown]
ASN: 34397
ASN Name: CYBERIA-RUH (Cyberia Riyadh Autonomous
System)
IP range connectivity: 2
Registrar (per ASN): RIPE
Country (per IP registrar): SA [Saudi Arabia]
Country Currency: SAR [Saudi Arabia Riyals]
Country IP Range: 93.98.0.0 to 93.98.255.255
Country fraud profile: Normal
City (per outside source): Riyadh, Ar Riyad
Country (per outside source): SA [Saudi Arabia]
Private (internal) IP? No
IP address registrar: whois.arin.net
Whatsa matter? Couldn't find anyone in your country interested in listening
to you?
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Posted by jeff_wisnia on October 15, 2009, 6:29 pm
mynick wrote:
> no shorts between magnetron contacts or ground but when plugged it
> does not heat the oven contents and has loud hum
> Is it dead(how to make sure) or perhaps requires say 1v higher cathode
> heating voltage than what transformer supplies?
Watch out for a big capacitor in there which in some cases can give you
a nasty high voltage bite even after the oven has been unplugged for a
while.
Jeff
--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10e12 furlongs per fortnight.
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Posted by Erik on October 16, 2009, 12:01 am
In article
> mynick wrote:
>
> > no shorts between magnetron contacts or ground but when plugged it
> > does not heat the oven contents and has loud hum
> > Is it dead(how to make sure) or perhaps requires say 1v higher cathode
> > heating voltage than what transformer supplies?
>
>
> Watch out for a big capacitor in there which in some cases can give you
> a nasty high voltage bite even after the oven has been unplugged for a
> while.
>
> Jeff
Or as a guy I know would so eloquently warn... "Dont ya'll be messin
with that s**t lest you know what you doin; it'll up'n give yo ass a
dirt nap"
Good advise too. I hate 'dirt naps' anymore, especially now that I'm a
bit older.
Microwaves reached disposable appliance status eons ago... if it's not
in warranty, spring for a new one, they're cheap.
Erik
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Posted by mynick on October 16, 2009, 8:07 am
> In article
> > mynick wrote:
> > > no shorts between magnetron contacts or ground but when plugged it
> > > does not heat the oven contents and has loud hum
> > > Is it dead(how to make sure) or perhaps requires say 1v higher cathode
> > > heating voltage than what transformer supplies?
> > Watch out for a big capacitor in there which in some cases can give you
> > a nasty high voltage bite even after the oven has been unplugged for a
> > while.
> > Jeff
> Or as a guy I know would so eloquently warn... "Dont ya'll be messin
> with that s**t lest you know what you doin; it'll up'n give yo ass a
> dirt nap"
> Good advise too. I hate 'dirt naps' anymore, especially now that I'm a
> bit older.
> Microwaves reached disposable appliance status eons ago... if it's not
> in warranty, spring for a new one, they're cheap.
> Erik
I meant what is going to happen if you try replace original magnetron
with one that has 4.13v or 3.6v filament voltage but original hv
transformer gives 3.15V
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>> does not heat the oven contents and has loud hum
>> Is it dead(how to make sure) or perhaps requires say 1v higher cathode
>> heating voltage than what transformer supplies?