There was a smell of Bakelite from our washing machine this morning. At
least, I think that's what it is. It reminds me of Veroboard, and old
light-brown PCBs. Can I assume that one of the components on a board is
overheating? Or is there something else that has a similar smell?

On 05/12/2017 11:30, Dan S. MacAbre wrote:
There was a smell of Bakelite from our washing machine this morning.Â* At
least, I think that's what it is.Â* It reminds me of Veroboard, and old
light-brown PCBs.Â* Can I assume that one of the components on a board is
overheating?Â* Or is there something else that has a similar smell?

You don't see so many phenolic PCBs these days, but it is still used in
motor windings so I think I might be looking there.

newshound wrote:
On 05/12/2017 11:30, Dan S. MacAbre wrote:
There was a smell of Bakelite from our washing machine this morning.
At least, I think that's what it is. It reminds me of Veroboard, and
old light-brown PCBs. Can I assume that one of the components on a
board is overheating? Or is there something else that has a similar
smell?

You don't see so many phenolic PCBs these days, but it is still used in
motor windings so I think I might be looking there.

Okay, thanks. Perhaps the missus overloaded it this morning? I changed
the brushes a few months ago, but I can't imagine any connection between
the two, unless I damaged something, or failed to reconnect something
properly. Anyway, I'll have a look soon.

Dan S. MacAbre wrote:
There was a smell of Bakelite from our washing machine this morning. At
least, I think that's what it is. It reminds me of Veroboard, and old
light-brown PCBs. Can I assume that one of the components on a board is
overheating? Or is there something else that has a similar smell?
Sometime SRBP is used for the motor speed controller circuit board but
less so in modern machines.
Also the capacitors in the mains power filter can let out the smoke and
smell similar. in this case the machine will continue to run as the
capacitors are shunt not series.

Bob Minchin wrote:
Dan S. MacAbre wrote:
There was a smell of Bakelite from our washing machine this morning. At
least, I think that's what it is. It reminds me of Veroboard, and old
light-brown PCBs. Can I assume that one of the components on a board is
overheating? Or is there something else that has a similar smell?
Sometime SRBP is used for the motor speed controller circuit board but
less so in modern machines.
Also the capacitors in the mains power filter can let out the smoke and
smell similar. in this case the machine will continue to run as the
capacitors are shunt not series.

Thanks. A few more things to check :-)

On Tuesday, 5 December 2017 11:43:30 UTC, newshound wrote:
On 05/12/2017 11:30, Dan S. MacAbre wrote:
There was a smell of Bakelite from our washing machine this morning.Â* At
least, I think that's what it is.Â* It reminds me of Veroboard, and old
light-brown PCBs.Â* Can I assume that one of the components on a board is
overheating?Â* Or is there something else that has a similar smell?

You don't see so many phenolic PCBs these days, but it is still used in
motor windings so I think I might be looking there.

FR2 is very common, often with green varnish to make it look superficially like FR4. It does not suit high vibration uses like washing machines.


NT

Well, its hard to tell from just that. Mostly I associate the smell with
overheating, but it could be lacquer in a transformer or motor, or the pcb
having gotten wet and caused heating or a dry joint that is heating the pcb,
or any number of other things.
All I'd say is that you need to be in when its running until something
actually fails.
If its getting hot then its not going to be a good thing, and all things
being equal its probably a component that needs a large current or is
actually sparking to create that smell.
I'm not sure if I'd advise looking at it yourself, but if there is a way to
look and you see blue smoke then I'd suggest you found the issue!

Brian

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"Dan S. MacAbre" wrote in message
news
There was a smell of Bakelite from our washing machine this morning. At
least, I think that's what it is. It reminds me of Veroboard, and old
light-brown PCBs. Can I assume that one of the components on a board is
overheating? Or is there something else that has a similar smell?

No it won't be the brushes that has caused it and on mine at least it
refuses to go more than a couple of turns if it suspects its overloaded, I'd
assume most have a safety feature these days. My money is either on the
motor has a fault condition in a winding , there is a mechanical sequencer
fault or a mains connection on a pcb, maybe near a relay, is dry and getting
hot.

Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Dan S. MacAbre" wrote in message
news
newshound wrote:
On 05/12/2017 11:30, Dan S. MacAbre wrote:
There was a smell of Bakelite from our washing machine this morning.
At least, I think that's what it is. It reminds me of Veroboard, and
old light-brown PCBs. Can I assume that one of the components on a
board is overheating? Or is there something else that has a similar
smell?

You don't see so many phenolic PCBs these days, but it is still used in
motor windings so I think I might be looking there.

Okay, thanks. Perhaps the missus overloaded it this morning? I changed
the brushes a few months ago, but I can't imagine any connection between
the two, unless I damaged something, or failed to reconnect something
properly. Anyway, I'll have a look soon.

I think an empty run might test if something terminal is about to happen. He
does not say the make or age of this machine and its history.
Brian

--
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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Bob Minchin" wrote in message
news
Dan S. MacAbre wrote:
There was a smell of Bakelite from our washing machine this morning. At
least, I think that's what it is. It reminds me of Veroboard, and old
light-brown PCBs. Can I assume that one of the components on a board is
overheating? Or is there something else that has a similar smell?
Sometime SRBP is used for the motor speed controller circuit board but
less so in modern machines.
Also the capacitors in the mains power filter can let out the smoke and
smell similar. in this case the machine will continue to run as the
capacitors are shunt not series.

"Dan S. MacAbre" wrote in message
news
There was a smell of Bakelite from our washing machine this morning. At
least, I think that's what it is. It reminds me of Veroboard, and old
light-brown PCBs. Can I assume that one of the components on a board is
overheating? Or is there something else that has a similar smell?


should that not be much sort after bakerlight ?

Dan S. MacAbre wrote

There was a smell of Bakelite from our washing machine this morning. At
least, I think that's what it is. It reminds me of Veroboard, and old
light-brown PCBs. Can I assume that one of the components on a board is
overheating?

Yep.

Or is there something else that has a similar smell?

Not in washing machines.

On 05/12/17 11:30, Dan S. MacAbre wrote:
There was a smell of Bakelite from our washing machine this morning.Â* At
least, I think that's what it is.Â* It reminds me of Veroboard, and old
light-brown PCBs.Â* Can I assume that one of the components on a board is
overheating?Â* Or is there something else that has a similar smell?

Yup. Macgi smoke probably about to come out. Largely that will be
shellac in the motor winds, and means you have worn brushes, siezed
beaeings or an armature short.


--
"I am inclined to tell the truth and dislike people who lie consistently.
This makes me unfit for the company of people of a Left persuasion, and
all women"

On 05/12/2017 13:51, Bob Minchin wrote:
Dan S. MacAbre wrote:
There was a smell of Bakelite from our washing machine this morning.Â* At
least, I think that's what it is.Â* It reminds me of Veroboard, and old
light-brown PCBs.Â* Can I assume that one of the components on a board is
overheating?Â* Or is there something else that has a similar smell?
Sometime SRBP is used for the motor speed controller circuit board but
less so in modern machines.
Also the capacitors in the mains power filter can let out the smoke and
smell similar. in this case the machine will continue to run as the
capacitors are shunt not series.

On holiday in France many years ago and in bed with a severe hangover, I
head a bang. Investigation lead me to the dishwasher, once I could
struggle out of bed.

I took a look and at first saw nothing wrong. Another look, still
nothing. Finally I spotted a 1-1/2" diameter capacitor that had blown.
The reason I hadn't seen straight off was that the cover had blown right
off and the wound internals had gone with it, extending telescopically
and it looked like a 2" pipe going from one side of the machine to the
other!

SteveW