Root cause insight into the common BMW blower motor resistor

jim beam wrote:

On 03/29/2013 10:22 PM, Michael A. Terrell wrote:


Jamie wrote:


jim beam wrote:

On 03/28/2013 06:51 PM, Michael A. Terrell wrote:


jim beam wrote:


that's bogus. unless there's been a MAJOR screw-up, potting
compounds
are carefully matched to the thermal and chemical application - they
serve to increase reliability, not degrade it.




How many deigns have you selected the proper potting compounds
for?
What types of filler materials? How did you verify that no moisture
would be trapped inside the potting? Did you verify the temperature
coefficient of very component, the PC board material and the housing?
Test it for extended periods over the entire temperature, humidity and
barometric conditions that it can encounter in service. how about
vibration & impact testing? Or are you just blowing more smoke out
your
ass.



wtf is eating your ass tonight? you're right that all those factors
are
relevant. that's why i said potting compounds are "carefully matched".

as to moisture, you're attacking a straw man. i specifically didn't
list every possible application detail because it's common knowledge to
anyone doing that work. nobody specifies that any more than mechanical
drawings specify conventional right-hand threading on fasteners. /all/
fasteners are right hand threaded UNLESS left hand is specifically
detailed.



Let me offer you some good advice, put him on your black list so it
won't eat you up. I only see him in replies now, like yours here because
I have block him out of my reader.

He's nothing but an old bickering dried up prone. In his younger
years he most likely good off on little kids learning the field and made
him
feel like he was something else when he offered any knowledge that he
thought was useful to them. These days, the little kids have grown
up and most likely found out that half the information he fed them was
bogus!



Keep up the slander Maynard. I taught first year high school
electronics while I was still a Junior in that school. After that, I
trained new techs to use what they learned in school on the repair
benchg so they could earn a living. I was still doing this at
Microdyne, till the closed the local telemetry 'engineer to order'
facility.

The rest of my work history is online, along with my military service
with AFRTSwhich is availible to anyone with the DOD records database.
Maynard refuses to tell anyone where he works. He just damns everyone
else.


Don't worry about what he has to say, he's one of those that wants
every one like you, to kiss is feet and say how much of a god he is.

It should be obviously that will never happen from this end :)



The irony! I was 'black list' by an illiterate troll. All I can do
is laugh at the nonsense writing 'style' of someone who consistently
makes a fool of himself on news:sci.electronics.design He thinks an
'Electret' microphone is a 'crystal' microphone. His real name is
Maynard Philbrick. A typical appliance operator 'ham' with the call of
KA1LPA. look at his website to see what a sick individual he is.
http://webpages.charter.net/jamie_5/ if you have the stomach for
childish dirvel.



it's drivel, not "dirvel".

as to your apparent feud, i don't know either you or jamie - i only read
r.a.t and neither of you are regular contributors. i will say though
that given my interactions so far, he's fine. you're not. and fyi,
publishing someone else's personal details on usenet is seriously huge
asshole behavior. you can be a retard and publish your own personals
all you want, but someone else's is /WAY/ out of line.


You know it's very funny, what he does. He thinks it bothers me by him
publishing my details in the manner in which he does. What he seems to
be very ignorant about is his willingness to incriminate himself.

Have fun and enjoy his ranting, he's a real party popper.

Adios amigo...

Jamie
 
Jamie wrote:
You know it's very funny, what he does. He thinks it bothers me by him
publishing my details in the manner in which he does. What he seems to
be very ignorant about is his willingness to incriminate himself.

Yawn..............................................................

--

Politicians should only get paid if the budget is balanced, and there is
enough left over to pay them.

Sometimes Friday is just the fifth Monday of the week. :(
 
"Bimmer Owner" wrote in message news:kisqep$jpd$2@news.albasani.net...

On Tue, 26 Mar 2013 09:43:58 -0700, trader4@optonline.net wrote:

They do have that 16 pin chip there, doing something.
It might receive the command and then output the appropriate PWM for
rest of the circuit.

Someone had scoped the whole board, and it was DC voltage everywhere
(according to that reference). It's pretty clear there is no PWM.

The 16-pin surface mount chip seems to be a automotive temperature
compensated voltage regulator with a huge voltage range, according
to a lookup of the part number on it.

Here is the Elmos 10901D chip of my FSU as I cut it open today.
http://www4.picturepush.com/photo/a/12515632/img/12515632.jpg

I wish there was a way to get rid of that heavy fibrous plastic goop!
(What is that black fibrous tough stuff anyway?)

I have had good luck removing the stuff used on motorcycle voltage
regulators that were potted soaking in MEK Methyl ethyl ketone
(spelling?). Potent stuff. Use outdoors and keep your hands out of it. WW
 
"WW" <ccco@nospambresnan.net> wrote in message
news:SvmdnW2SXJ10M2zPnZ2dnUVZ_tednZ2d@bresnan.com...
I have had good luck removing the stuff used on motorcycle voltage
regulators that were potted soaking in MEK Methyl ethyl ketone
(spelling?). Potent stuff. Use outdoors and keep your hands out of it.
WW

I don't know what it actually is but at work we desolved a potted firing
system for a boat motor with something called OCP. Really stinks. Don't
think I would want it in a car after it was used.



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On 2/4/2014 8:09 PM, Ralph Mowery wrote:
"WW"<ccco@nospambresnan.net> wrote in message
news:SvmdnW2SXJ10M2zPnZ2dnUVZ_tednZ2d@bresnan.com...

I have had good luck removing the stuff used on motorcycle voltage
regulators that were potted soaking in MEK Methyl ethyl ketone
(spelling?). Potent stuff. Use outdoors and keep your hands out of it.
WW

I don't know what it actually is but at work we desolved a potted firing
system for a boat motor with something called OCP. Really stinks. Don't
think I would want it in a car after it was used.



---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com
My electronic assembly company built the electronic control unit for BMC
Chopper of Bend, Oregon. Now defunked. We used two-part black epoxy that
took 24 hours to completely cure. When applied it was water thin. Had to
prep the box with RTV to keep the potting from running out around the
connectors.

Paul
 

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