Should I be concerned? What is this fan's job? Is it to keep the oven
ventilated of food vapors or to cool the magnetron? If the latter then I
need to replace it asap.

Thanks,
DaveL

dave wrote:

Should I be concerned? What is this fan's job? Is it to keep the oven
ventilated of food vapors or to cool the magnetron? If the latter then I
need to replace it asap.

Yes, its main purpose is to cool magnetron, although it does also the
cooking chamber ventilation. So replace it asap..

--
Top-posting not supported.

"dave" nospam wrote in
:

Should I be concerned? What is this fan's job? Is it to keep the
oven ventilated of food vapors or to cool the magnetron? If the
latter then I need to replace it asap.

From the FAQ:
Since 30 to 50 percent of the power into a microwave oven is dissipated
as heat in the Magnetron, cooling is extremely important. Always inspect
the cooling fan/motor for dust and dirt and lubricate if necessary. A
couple of drops of electric motor oil or 3-in-One will go a long way. If
there are any belts, inspect for deterioration and replace if necessary.

http://repairfaq.cis.upenn.edu/sam/micfaq.htm#miccfans

dave wrote:
Should I be concerned? What is this fan's job? Is it to keep the oven
ventilated of food vapors or to cool the magnetron? If the latter then
I need to replace it asap.

Thanks,
DaveL


The fan is critical. They rarely fail though, usually cleaning and
lubricating the bearings will get you a few more years.

"dave" nospam wrote in message
. ..
Should I be concerned? What is this fan's job? Is it to keep the oven
ventilated of food vapors or to cool the magnetron? If the latter then I
need to replace it asap.

http://home.cvc.org/microwaves/34_Stirrer.html

dave wrote:

Should I be concerned? What is this fan's job? Is it to keep the oven
ventilated of food vapors or to cool the magnetron? If the latter then I
need to replace it asap.

Thanks,
DaveL

The fan cools the magnetron, which runs red hot under forced cooling.*
It cools the transformer. It also blows the steam out so the electrics
dont get wet. All these are non-optional functions. If the fan fails,
switch off right away.

NT

* used to have one where you could watch it glow in use

wrote in message
oups.com...

The fan cools the magnetron, which runs red hot under forced cooling.*
It cools the transformer. It also blows the steam out so the electrics
dont get wet.

And in a sensor microwave it purges the chamber.

Well, I have a couple of the covers off. I have the control panel off and I
can see the fan. It's in the back and not accessable without removing the
entire unit (it's a GE, over the stove type). I'd like to verify if the
cooling fan is not turning (it's been very quiet lately). I also took off
the bottom panel to reveal a small cover which I also removed revealing the
stiring motor. This oven still cooks evenly so I guess the stirer is Ok?
Can I run the oven to check the fan with the control panel off? Is that
safe? I can see the magnetron housing in front of the fan. It seems to be
ducted under the bottom to the stirer.

Dave

I just took a chance and started the oven for 2 seconds with the panel off.
The fan looks like it's turning just fine. Maybe it is the stirer.

DaveL


"dave" nospam wrote in message
. ..
Well, I have a couple of the covers off. I have the control panel off and
I can see the fan. It's in the back and not accessable without removing
the entire unit (it's a GE, over the stove type). I'd like to verify if
the cooling fan is not turning (it's been very quiet lately). I also took
off the bottom panel to reveal a small cover which I also removed
revealing the stiring motor. This oven still cooks evenly so I guess the
stirer is Ok? Can I run the oven to check the fan with the control panel
off? Is that safe? I can see the magnetron housing in front of the fan.
It seems to be ducted under the bottom to the stirer.

Dave

Well, I tried another test. I taped a piece of tissue paper to the air inlet
into the cooking area and ran the unit. The airflow is simultaneous with
the fan noise (which has been slow to activate and not as loud). So it is
the fan and I need to lube it and the unit must come off the wall to do it.
Bummer.

DaveL


"dave" nospam wrote in message
. ..
I just took a chance and started the oven for 2 seconds with the panel off.
The fan looks like it's turning just fine. Maybe it is the stirer.

DaveL


"dave" nospam wrote in message
. ..
Well, I have a couple of the covers off. I have the control panel off
and I can see the fan. It's in the back and not accessable without
removing the entire unit (it's a GE, over the stove type). I'd like to
verify if the cooling fan is not turning (it's been very quiet lately).
I also took off the bottom panel to reveal a small cover which I also
removed revealing the stiring motor. This oven still cooks evenly so I
guess the stirer is Ok? Can I run the oven to check the fan with the
control panel off? Is that safe? I can see the magnetron housing in
front of the fan. It seems to be ducted under the bottom to the stirer.

Dave

Please note that if you can see the microwave stirrer through a hole without
intervening wire mesh and the hole is more than a fraction of an inch
in diameter, the microwaves can get to you!

However, if it was only on for a couple of seconds, the magnetron filament
hasn't had a chance to get hot.

--- sam | Sci.Electronics.Repair FAQ: 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 Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.

"dave" nospam writes:

Well, I tried another test. I taped a piece of tissue paper to the air inlet
into the cooking area and ran the unit. The airflow is simultaneous with
the fan noise (which has been slow to activate and not as loud). So it is
the fan and I need to lube it and the unit must come off the wall to do it.
Bummer.

DaveL


"dave" nospam wrote in message
. ..
I just took a chance and started the oven for 2 seconds with the panel off.
The fan looks like it's turning just fine. Maybe it is the stirer.

DaveL


"dave" nospam wrote in message
. ..
Well, I have a couple of the covers off. I have the control panel off
and I can see the fan. It's in the back and not accessable without
removing the entire unit (it's a GE, over the stove type). I'd like to
verify if the cooling fan is not turning (it's been very quiet lately).
I also took off the bottom panel to reveal a small cover which I also
removed revealing the stiring motor. This oven still cooks evenly so I
guess the stirer is Ok? Can I run the oven to check the fan with the
control panel off? Is that safe? I can see the magnetron housing in
front of the fan. It seems to be ducted under the bottom to the stirer.

Dave

Yes. I put the cover back on the stirrer motor before starting. I've come
to the conclusion that the cooling/ventilation fan is getting weak. It's
slow to start up and even then only runs at half speed. It is located
towards the back so I''ll have to pull the unit off the wall to get to it.
It will take me a few days to do that. I saw a thermistor on the magnetron.
Looks like part of a thermal cutout circuit. Since that will keep it from
overheating I think I'm safe using the oven like this for the short term.
Hey, I'm a bachelor. I can't survive without my microwave!

DaveL


"Sam Goldwasser" wrote in message
...
Please note that if you can see the microwave stirrer through a hole
without
intervening wire mesh and the hole is more than a fraction of an inch
in diameter, the microwaves can get to you!

However, if it was only on for a couple of seconds, the magnetron filament
hasn't had a chance to get hot.

--- sam | Sci.Electronics.Repair FAQ: 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 Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above
is
ignored unless my full name AND either lasers or electronics is included
in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.

"dave" nospam writes:

Well, I tried another test. I taped a piece of tissue paper to the air
inlet
into the cooking area and ran the unit. The airflow is simultaneous with
the fan noise (which has been slow to activate and not as loud). So it
is
the fan and I need to lube it and the unit must come off the wall to do
it.
Bummer.

DaveL


"dave" nospam wrote in message
. ..
I just took a chance and started the oven for 2 seconds with the panel
off.
The fan looks like it's turning just fine. Maybe it is the stirer.

DaveL


"dave" nospam wrote in message
. ..
Well, I have a couple of the covers off. I have the control panel off
and I can see the fan. It's in the back and not accessable without
removing the entire unit (it's a GE, over the stove type). I'd like
to
verify if the cooling fan is not turning (it's been very quiet
lately).
I also took off the bottom panel to reveal a small cover which I also
removed revealing the stiring motor. This oven still cooks evenly so
I
guess the stirer is Ok? Can I run the oven to check the fan with the
control panel off? Is that safe? I can see the magnetron housing in
front of the fan. It seems to be ducted under the bottom to the
stirer.

Dave

"dave" nospam wrote in message
. ..

Yes. I put the cover back on the stirrer motor before starting. I've
come to the conclusion that the cooling/ventilation fan is getting weak.
It's slow to start up and even then only runs at half speed. It is
located towards the back so I''ll have to pull the unit off the wall to
get to it. It will take me a few days to do that. I saw a thermistor on
the magnetron. Looks like part of a thermal cutout circuit. Since that
will keep it from overheating I think I'm safe using the oven like this
for the short term. Hey, I'm a bachelor. I can't survive without my
microwave!

I would clean the bearings with a solvent (like kerosene), soak that out
with paper towels getting them as clean and dust free as I can, then use a
good oil for self lubricating bearings.

However that is my choice - YMMV.

Homer J Simpson wrote:
"dave" nospam wrote in message
. ..

Yes. I put the cover back on the stirrer motor before starting. I've
come to the conclusion that the cooling/ventilation fan is getting weak.
It's slow to start up and even then only runs at half speed. It is
located towards the back so I''ll have to pull the unit off the wall to
get to it. It will take me a few days to do that. I saw a thermistor on
the magnetron. Looks like part of a thermal cutout circuit. Since that
will keep it from overheating I think I'm safe using the oven like this
for the short term. Hey, I'm a bachelor. I can't survive without my
microwave!

I would clean the bearings with a solvent (like kerosene), soak that out
with paper towels getting them as clean and dust free as I can, then use a
good oil for self lubricating bearings.

However that is my choice - YMMV.

Some basic clues re safety would be good for the op too, might help him
live longer.


NT

"Homer J Simpson" writes:

"dave" nospam wrote in message
. ..

Yes. I put the cover back on the stirrer motor before starting. I've
come to the conclusion that the cooling/ventilation fan is getting weak.
It's slow to start up and even then only runs at half speed. It is
located towards the back so I''ll have to pull the unit off the wall to
get to it. It will take me a few days to do that. I saw a thermistor on
the magnetron. Looks like part of a thermal cutout circuit. Since that
will keep it from overheating I think I'm safe using the oven like this
for the short term. Hey, I'm a bachelor. I can't survive without my
microwave!

I would clean the bearings with a solvent (like kerosene), soak that out
with paper towels getting them as clean and dust free as I can, then use a
good oil for self lubricating bearings.

However that is my choice - YMMV.

That would probably work for awhile, perhaps years, but I wonder given
the difficulty and time required to get to the motor if simply replacing
it would be a better option.

--- sam | Sci.Electronics.Repair FAQ: 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 Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.

"Sam Goldwasser" wrote in message
...

I would clean the bearings with a solvent (like kerosene), soak that out
with paper towels getting them as clean and dust free as I can, then use
a
good oil for self lubricating bearings.

However that is my choice - YMMV.

That would probably work for awhile, perhaps years, but I wonder given
the difficulty and time required to get to the motor if simply replacing
it would be a better option.

I'm assuming that anyone who attempts this is cheap enough to spend the time
and brave enough to open the box.

dave wrote:
Well, I have a couple of the covers off. I have the control panel off
and I can see the fan. It's in the back and not accessable without
removing the entire unit (it's a GE, over the stove type). I'd like to
verify if the cooling fan is not turning (it's been very quiet lately).
I also took off the bottom panel to reveal a small cover which I also
removed revealing the stiring motor. This oven still cooks evenly so I
guess the stirer is Ok? Can I run the oven to check the fan with the
control panel off? Is that safe? I can see the magnetron housing in
front of the fan. It seems to be ducted under the bottom to the stirer.

Dave


Usually it's only 4 screws to remove the entire unit on those over range
ones. You'll spend a lot less time removing the whole thing to work on
it than you will trying to work around it.

While you do the cleaning and lubrication, check also the connections
to make sure that there aren't bad contacts.

--
Top-posting not supported.

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