sci.electronics.repair@googlegroups.com

Today's topics:

* Microwave Oven: Noisy, shuts down sometimes? - 3 messages, 3 authors
http://groups.google.com/group/sci.electronics.repair/t/8dc6fa75132215e7?hl=en
* http://www.michaelbennettplumbing.com - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/5d3a297cf89ba8d3?hl=en
* Today's lead free story, and a "Mr Cook" moment ... - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/8924a25c81bfe18e?hl=en

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TOPIC: Microwave Oven: Noisy, shuts down sometimes?
http://groups.google.com/group/sci.electronics.repair/t/8dc6fa75132215e7?hl=en
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== 1 of 3 ==
Date: Wed, Sep 29 2010 6:52 pm
From: "William Sommerwerck"

The noise suggests a bad fan -- which could be preventing proper cooling.
This, in turn, might result in overheating which opens a resettable thermal
breaker.

I'd find out why it's noisy. If it's a bad fan, and replacing the fan
doesn't fix the problem, I'd toss the oven. Sorry.

It's possible you're doing something wrong to make it overheat, but I have
no idea what that might be.

== 2 of 3 ==
Date: Wed, Sep 29 2010 9:37 pm
From: "bw"

"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
news:i80qig$rl5$1@news.eternal-september.org...
> The noise suggests a bad fan -- which could be preventing proper cooling.
> This, in turn, might result in overheating which opens a resettable
> thermal
> breaker.
>
> I'd find out why it's noisy. If it's a bad fan, and replacing the fan
> doesn't fix the problem, I'd toss the oven. Sorry.
>
> It's possible you're doing something wrong to make it overheat, but I have
> no idea what that might be.
>

Yes, the fan is the only moving part and is essential to cool the magnetron.

I've scavenged more than a few microwaves. They all have basically the same
internals. You should have no problem finding the air-flow obstruction or
replacing the fan.

You don't need the special torx driver, just use a dremel to slice a slot
into each screw head and then use a regular slotted screwdriver.

== 3 of 3 ==
Date: Wed, Sep 29 2010 10:54 pm
From: "Ron D."

Autoparts store should have the driver bits.

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TOPIC: http://www.michaelbennettplumbing.com
http://groups.google.com/group/sci.electronics.repair/t/5d3a297cf89ba8d3?hl=en
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== 1 of 1 ==
Date: Wed, Sep 29 2010 8:05 pm
From: Anne Onime

http://michaelbennettplumbing.com/

Michael Bennett Plumbing

Michael Bennett Heating

Michael Bennett Gas Fitting

Serving DC-MD-VA

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TOPIC: Today's lead free story, and a "Mr Cook" moment ...
http://groups.google.com/group/sci.electronics.repair/t/8924a25c81bfe18e?hl=en
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== 1 of 1 ==
Date: Thurs, Sep 30 2010 12:13 am
From: "N_Cook"

Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:SJRoo.310$JF6.85@newsfe10.ams2...
> Fender combo. Owner complained that sound level varied, or sound went off
> altogether for brief periods, after a half hour of use. Additional symptom
> was that the status LEDs on the footpedal flickered. He said that he'd
> looked it up on the net, and many people had reported that this problem
was
> caused by the two ceramic feed resistors in the low voltage + and - rails,
> having bad joints. OK, we've all seen this, I guess. Anyways, unit would
not
> fault on my bench, and no amount of pushing, prodding, poking, bashing,
> heating or freezing, would provoke it, so reluctantly, I had to remove the
> main board to get a look behind it. I say reluctantly, because it's a bit
of
> a long winded job involving removal of all of the (grub screwed) knobs,
pot
> nuts and washers, jack nuts and washers etc. When the board was out, I had
a
> really detailed look at all the joints with a powerful light and my
headband
> magnifier, but no joints actually looked bad anywhere, including on the
two
> ceramic resistors. So I went for the Mr Cook test and grabbed the wires on
> those resistors one by one with pliers, and pulled. And Lo! On the third
> one, it pulled cleanly and easily from the joint, leaving the now dreaded
> 'volcano' behind. How much longer are we going to have to put up with this
> crap ? It's not as if it's the quick 'good little earner' that bad joints
> used to be when you could find them in a minute or two with a Biro pen, a
> can of freezer, and a Mk I eyeball ...
>
> Arfa
>

acknowledged

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