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microwave microswitch
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gghe...@gmail.com
Dec 30, 2013, 10:55:41 AM12/30/13
to
Hi Gents, Well the microwave stopped working over the holiday.
(Two year old Cuisinart)
(Insert rant here about security screws.. torx with the pin in the center.)
After opening it up I found that the main door micro switch was no good. The warning on the inside says to only replace with other KW3A switches. Here’s a picture of what it looks like.
http://www.made-in-china.com/showroom/zenglp/product-detailcMCmWhZrZGYo/China-Micro-Switch-KW3A-.html
125V, 16A. Only has NO contact populated.
I’m looking for some place to order this is the US. There are similar looking switches made by honeywell and sold by mouser or newark.
These are V7 series. V7-6c17d8 14 ozf of force
or V7-1c17d8 5.6 ozf of force.
(only speced to 15 amps.. but should be fine.)
I figure I should order a handful of them since there are *three* switches in the door.
So first what’s an ozf? is it an ounce? I guess I can pull one of the working switches and measure how much force it takes to close it.
Here’s a link to newark.
http://www.newark.com/honeywell-s-c/v7-6c17d8/micro-switch-pin-plunger-spdt/dp/39B3001?MER=PPSO_N_C_EverywhereElse_None
any other advise is welcome.
(Hey I'm still searching for specs on the KW3A switch... like life time and contact force.)
George H.
(Two year old Cuisinart)
(Insert rant here about security screws.. torx with the pin in the center.)
After opening it up I found that the main door micro switch was no good. The warning on the inside says to only replace with other KW3A switches. Here’s a picture of what it looks like.
http://www.made-in-china.com/showroom/zenglp/product-detailcMCmWhZrZGYo/China-Micro-Switch-KW3A-.html
125V, 16A. Only has NO contact populated.
I’m looking for some place to order this is the US. There are similar looking switches made by honeywell and sold by mouser or newark.
These are V7 series. V7-6c17d8 14 ozf of force
or V7-1c17d8 5.6 ozf of force.
(only speced to 15 amps.. but should be fine.)
I figure I should order a handful of them since there are *three* switches in the door.
So first what’s an ozf? is it an ounce? I guess I can pull one of the working switches and measure how much force it takes to close it.
Here’s a link to newark.
http://www.newark.com/honeywell-s-c/v7-6c17d8/micro-switch-pin-plunger-spdt/dp/39B3001?MER=PPSO_N_C_EverywhereElse_None
any other advise is welcome.
(Hey I'm still searching for specs on the KW3A switch... like life time and contact force.)
George H.
N_Cook
Dec 30, 2013, 12:44:06 PM12/30/13
to
On 30/12/2013 15:55, gghe...@gmail.com wrote:
> Hi Gents, Well the microwave stopped working over the holiday.
> (Two year old Cuisinart)
> (Insert rant here about security screws.. torx with the pin in the center.)
> After opening it up I found that the main door micro switch was no good. The warning on the inside says to only replace with other KW3A switches. Here�s a picture of what it looks like.
> Hi Gents, Well the microwave stopped working over the holiday.
> (Two year old Cuisinart)
> (Insert rant here about security screws.. torx with the pin in the center.)
>
> http://www.made-in-china.com/showroom/zenglp/product-detailcMCmWhZrZGYo/China-Micro-Switch-KW3A-.html
>
> 125V, 16A. Only has NO contact populated.
>
> I�m looking for some place to order this is the US. There are similar looking switches made by honeywell and sold by mouser or newark.
> http://www.made-in-china.com/showroom/zenglp/product-detailcMCmWhZrZGYo/China-Micro-Switch-KW3A-.html
>
> 125V, 16A. Only has NO contact populated.
>
> These are V7 series. V7-6c17d8 14 ozf of force
> or V7-1c17d8 5.6 ozf of force.
> (only speced to 15 amps.. but should be fine.)
> I figure I should order a handful of them since there are *three* switches in the door.
> So first what�s an ozf? is it an ounce? I guess I can pull one of the working switches and measure how much force it takes to close it.
> or V7-1c17d8 5.6 ozf of force.
> (only speced to 15 amps.. but should be fine.)
> I figure I should order a handful of them since there are *three* switches in the door.
>
> Here�s a link to newark.
> http://www.newark.com/honeywell-s-c/v7-6c17d8/micro-switch-pin-plunger-spdt/dp/39B3001?MER=PPSO_N_C_EverywhereElse_None
>
> any other advise is welcome.
> (Hey I'm still searching for specs on the KW3A switch... like life time and contact force.)
>
> George H.
>
seems to go back to the days of slugs, ergs and all that antedeluvian
>
> any other advise is welcome.
> (Hey I'm still searching for specs on the KW3A switch... like life time and contact force.)
>
> George H.
>
stuff. Like pound-force, presumably ounce-force
Mike
Dec 30, 2013, 2:31:09 PM12/30/13
to
In article <l9sbd8$66c$1...@dont-email.me>, N_Cook <div...@tcp.co.uk> wrote:
>On 30/12/2013 15:55, gghe...@gmail.com wrote:
>> Hi Gents, Well the microwave stopped working over the holiday.
>On 30/12/2013 15:55, gghe...@gmail.com wrote:
>> Hi Gents, Well the microwave stopped working over the holiday.
>> These are V7 series. V7-6c17d8 14 ozf of force
>seems to go back to the days of slugs, ergs and all that antedeluvian
>stuff. Like pound-force, presumably ounce-force
Ounce-*feet*.
>stuff. Like pound-force, presumably ounce-force
Like pound-feet (or foot-pounds), but smaller, and like Newton-metres,
but from before metrication.
Torque to operate the switch lever, I guess.
--
--------------------------------------+------------------------------------
Mike Brown: mjb[-at-]signal11.org.uk | http://www.signal11.org.uk
--- news://freenews.netfront.net/ - complaints: ne...@netfront.net ---
mrob...@att.net
Dec 30, 2013, 3:00:08 PM12/30/13
to
gghe...@gmail.com wrote:
> (Two year old Cuisinart)
*People's Shining Microwave Factory #7 with a Cuisinart sticker on it.
Standard warning: There can be enough juice in the big capacitor to zap
you dead, even if the oven is unplugged. There's also a lot of RF
floating around, sharp edges, etc. Be careful.
http://www.repairfaq.org/sam/micfaq.htm#micsaf
> (Insert rant here about security screws.. torx with the pin in the
> center.)
For household stuff, Hazard Fraught Tool's $6 security bit set comes
in pretty handy. Not what you'd use for production, but fine if you
need it a couple of times a month. Chain hardware stores like Ace
and True Value tend to carry this same set as well.
http://www.harborfreight.com/33-piece-security-bit-set-68459.html
> After opening it up I found that the main door micro switch was no
> good.
There are usually three microswitches. One of them opens the 120 V
line from the wall, like you would expect. One of them switches a
low-voltage circuit to the control board. One of them *shorts* the
120 V line on purpose, blowing the fuse in the microwave, if the other
switches operate in the wrong order. So... check the main fuse as
well. Also look at the plastic assembly that interfaces between the
door latch prongs, the door open button (if equipped), and the
microswitches; if this plastic cracks or gets bent, it can either push
too hard on the switches or not push them at all.
> I figure I should order a handful of them since there are *three*
> switches in the door.
They may not all be exactly the same. Sometimes the one that goes to
the logic board has both NC and NO contacts.
> So first what?s an ozf? is it an ounce?
Ounce force. (As distinguished from ounce mass.) 1 ozf is about
0.278 N . http://en.wikipedia.org/wiki/Ounce#Ounce-force
> any other advise is welcome.
http://www.repairfaq.org/sam/micfaq.htm#micintrlk
http://www.repairfaq.org/sam/micfaq.htm#mictstris
http://www.repairfaq.org/sam/micfaq.htm#micsrmop
> (Hey I'm still searching for specs on the KW3A switch... like life
> time
Ten minutes longer than the warranty on the microwave. :)
> and contact force.)
This Taiwanese vendor has several flavors of KW3A switch, with a good
amount of specs on each one:
http://switchtech.com.tw/upload/201162285428410.pdf
Standard disclaimers apply: I don't get money or other consideration
from any companies mentioned.
Matt Roberds
> (Two year old Cuisinart)
*People's Shining Microwave Factory #7 with a Cuisinart sticker on it.
Standard warning: There can be enough juice in the big capacitor to zap
you dead, even if the oven is unplugged. There's also a lot of RF
floating around, sharp edges, etc. Be careful.
http://www.repairfaq.org/sam/micfaq.htm#micsaf
> (Insert rant here about security screws.. torx with the pin in the
> center.)
in pretty handy. Not what you'd use for production, but fine if you
need it a couple of times a month. Chain hardware stores like Ace
and True Value tend to carry this same set as well.
http://www.harborfreight.com/33-piece-security-bit-set-68459.html
> After opening it up I found that the main door micro switch was no
> good.
line from the wall, like you would expect. One of them switches a
low-voltage circuit to the control board. One of them *shorts* the
120 V line on purpose, blowing the fuse in the microwave, if the other
switches operate in the wrong order. So... check the main fuse as
well. Also look at the plastic assembly that interfaces between the
door latch prongs, the door open button (if equipped), and the
microswitches; if this plastic cracks or gets bent, it can either push
too hard on the switches or not push them at all.
> I figure I should order a handful of them since there are *three*
> switches in the door.
the logic board has both NC and NO contacts.
> So first what?s an ozf? is it an ounce?
Ounce force. (As distinguished from ounce mass.) 1 ozf is about
0.278 N . http://en.wikipedia.org/wiki/Ounce#Ounce-force
> any other advise is welcome.
http://www.repairfaq.org/sam/micfaq.htm#mictstris
http://www.repairfaq.org/sam/micfaq.htm#micsrmop
> (Hey I'm still searching for specs on the KW3A switch... like life
> time
> and contact force.)
This Taiwanese vendor has several flavors of KW3A switch, with a good
amount of specs on each one:
http://switchtech.com.tw/upload/201162285428410.pdf
Standard disclaimers apply: I don't get money or other consideration
from any companies mentioned.
Matt Roberds
gghe...@gmail.com
Dec 31, 2013, 10:30:53 AM12/31/13
to
I measured the plunger force last night. ~5 - 6 oz. So I'm going to get some of the honeywell switches. They list a electrical life of 100k operations vs 50k for the specs I found for the KW3A. I was thinking that as well as the average time to failure it'd be nice if they also included the standard deviation. (I guess that's too much to ask.)
George H.
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