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Non Aviation electrical conponent question

 
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MNellis



Joined: 16 Aug 2008
Posts: 15
Location: Georgetown, TSX

PostPosted: Thu Jul 12, 2018 9:47 am    Post subject: Non Aviation electrical conponent question Reply with quote

I'm working on a commercial microwave oven in one of my restaurants.  One of the fuses blows when the start button is depressed.  There are 2 magnetron tubes,  one fan and 2 capacitors  and 2 diodes.

I still have more troubleshooting to do but i was curious if someone could tell me the purpose of the diodes in the picture.  Both diodes are checking bad on my Greenlee Meter (model DM-60).
https://photos.app.goo.gl/JKPdZ5u1VStbfrdk8

On Thu, Jul 12, 2018, 10:34 jonlaury <jonlaury(at)impulse.net (jonlaury(at)impulse.net)> wrote:

Quote:
--> AeroElectric-List message posted by: "jonlaury" <jonlaury(at)impulse.net (jonlaury(at)impulse.net)>


BMC_Dave wrote:
> It almost feels like I'm being intentionally gaslit, I'll try again. ... (snip)


For the etymologically curious:

"The original (meaning) stems from 1938 stage play Gas Light and the dimming of the gas lights in the house that happened when the husband was using the gas lights in the flat above while searching for the jewels belonging to a woman whom he had murdered. The wife correctly notices the dimming lights and discusses it with her husband, but he insists that she merely imagined a change in the level of illumination."




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Mike Nellis
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user9253



Joined: 28 Mar 2008
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PostPosted: Thu Jul 12, 2018 10:52 am    Post subject: Re: Non Aviation electrical conponent question Reply with quote

I did a google search for "microwave diode purpose" without quotes. The diode (rectifier) and the capacitor function together to effectively double the already-high voltage. This is called a voltage-doubler circuit.
The google search results have links to testing diodes.
Since your microwave has two identical circuits, you could switch parts between the two circuits to determine which is bad.


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PostPosted: Thu Jul 12, 2018 11:05 am    Post subject: Re: Non Aviation electrical conponent question Reply with quote

This Youtube video says that microwave high voltage diodes can not be checked the normal way. The video shows how to do it using a 9 volt battery and meter.
https://www.youtube.com/watch?v=a6lrKf2PdVA


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MNellis



Joined: 16 Aug 2008
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Location: Georgetown, TSX

PostPosted: Thu Jul 12, 2018 1:53 pm    Post subject: Non Aviation electrical conponent question Reply with quote

Thank you Joe, that was helpful.  Both diodes tested vood so ill keep on checking on why one of the 15a fuses to one of the HV power aupplies keeps blowing.

Mike
On Thu, Jul 12, 2018, 14:08 user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:

Quote:
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

This Youtube video says that microwave high voltage diodes can not be checked the normal way.  The video shows how to do it using a 9 volt battery and meter.
https://www.youtube.com/watch?v=a6lrKf2PdVA

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Joe Gores




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