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schematic needed for Kenmore microwave-Hood 721.62752100 Goldstar LG

I have a Kenmore over the stove microwave - hood vent model #
721.62752100. A few months ago the light under the unit that lights up
the stove top kept getting dimmer and dimmer. Then one day I turned on
the microwave to heat something up and there was a spark behind the
control panel and it was dead. I checked the outlet and the fuse, they
were both good. I pulled off the control panel and found that one of
the copper links on the curcuit board had been melted. I jumped it with
a small piece of wire. Now I get power to the clock, timer, and fan.
The microwave still doesn't work. I'm assuming that something else
shorted out. I need a shematic or repair manual to de-bug the problem.

Any ideas????

Thanks - Alex
 
S

Skype_man

Jan 1, 1970
0
Sounds like a powerline surge, the control IC
MAY be bad, check the 1n4148 signal diodes
around the IC. With the light getting dimmer over
time, might be a burnt relay. Sky.
 
J

Jumpster Jiver

Jan 1, 1970
0
I have a Kenmore over the stove microwave - hood vent model #
721.62752100. A few months ago the light under the unit that lights up
the stove top kept getting dimmer and dimmer. Then one day I turned on
the microwave to heat something up and there was a spark behind the
control panel and it was dead. I checked the outlet and the fuse, they
were both good. I pulled off the control panel and found that one of
the copper links on the curcuit board had been melted. I jumped it with
a small piece of wire. Now I get power to the clock, timer, and fan.
The microwave still doesn't work. I'm assuming that something else
shorted out. I need a shematic or repair manual to de-bug the problem.

Any ideas????

Thanks - Alex

You need a repair technician. Jumping a burnt circuit without checking
components to see why it burnt is an invitation to disaster.
While the control board has up to 120V AC in some places (if you're in
the US), microwaves have lethal voltage and current in other areas.
While this hasn't answered your question, I'm just trying to prevent a
tragedy. If you already know this, don't be insulted, and good luck
with your repair. Most manufacturers do not supply a schematic of the
control board. The whole board itself is considered a replaceable
component. The only diagram available will likely be a block diagram
which may be on a sticker inside the unit - maybe suck to the inside of
the cover.
I guess they think all a technician can do is unplug some wires and
replace a whole board.
Good luck and please be careful. If you don't know about microwave
safety specifically, please read http://www.repairfaq.org/sam/micfaq.htm
 
Thanks for the info. I called sears and I can buy a new board for $87.
I'm not sure it's worth it. I only paid $100 for the mircowave. I have
read several pages of information about microwave safety and I know
they can be very dangerous. Thank you for your concern. If I continue
with trying to repair the unit I will take precautions.
 
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