Re microwavr repair-update

[Eric R Snow]

Well, after leaving the microwave un-plugged for over a week I decided
to take a look and see if there were any "user servicable parts".
After discharging the high voltage cap(which was alredy discharged)
just to be safe I started checking things. There was one fuse in the
main line that wasn't blown and couldn't have been anyway because the
thing powers up. I ckecked all the interlock switches and they all
worked correctly. No other fuses were present. All connections were
tight. Just for laughs I un-plugged the magnetron and checked it for
conitnuity. And there was continuity. So, after checking everything I
could without applying power I put the housing back on and plugged it
in. I put a mug of water in and started the oven. It heated the water
fine! So, I tried a dish of food and no dice, nothing got hot. Then, I
tried water again and it remained cool. Even still you can tell the
oven is using a lot of power so I'm sure the xmfr is getting power. So
I think this means that the problem is in the high voltage section
which is beyond my skill to mess with safely. It does have lots of
good switches and other good parts so I'm gonna mine it for the
goodies and buy a new oven. Thanks to all who provided good advice.
ERS

 

[Jamie]

sounds like a shorted HV diode.

 

[Sam Goldwasser]

sounds like a shorted HV diode.

Since it was working, then stopped working, then was working, then stopped
working, not a shorted HV diode. Not likely to go intermittent!

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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[Ampdoc]

Magnetron defective?


--
Jammy Harbin
J & J Electronics, Inc.
227 S. 4th St.
Selmer, TN 38375
731-645-3311

 

[Art]

Thermal Cutout, Magnetron, HV Capacitor, Controller, Etc?? Cost effective at
this point???

 

[Sam Goldwasser]

Magnetron defective?

Might be loose connection to the filament, either external (loose lug)
or bad weld/solder joint inside the metal box at the bottom of the
magnetron.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

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[Sam Goldwasser]

Thermal Cutout, Magnetron, HV Capacitor, Controller, Etc?? Cost effective at
this point???

Perhaps, can you say: "Challenge"?

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
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[Jamie]

excuse me, but i did have a unit with a bad diode that would
fail after using it and many times correct it self after
cool down.
it would work ok the first time, stop and put something else in there
and it would barely get warm. shut it off and wait for a bit and it
would work again.
also had a bridge in my old Tek 464 do that. it would randomly
pop fuese now and then after some time being on.