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Root cause insight into the common BMW blower motor resistorfailures



 
 
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  #261  
Old February 5th 14, 04:24 AM posted to rec.autos.tech,sci.electronics.repair,alt.autos.bmw,alt.home.repair
WW[_2_]
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Posts: 51
Default Root cause insight into the common BMW blower motor resistor failures



"Bimmer Owner" wrote in message ...

On Tue, 26 Mar 2013 09:43:58 -0700, 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/...g/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

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  #262  
Old February 5th 14, 05:09 AM posted to rec.autos.tech,sci.electronics.repair,alt.autos.bmw,alt.home.repair
Ralph Mowery
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Posts: 37
Default Root cause insight into the common BMW blower motor resistor failures


"WW" > wrote in message
. ..
>
> 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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  #263  
Old February 5th 14, 09:16 PM posted to rec.autos.tech,sci.electronics.repair,alt.autos.bmw,alt.home.repair
Paul Drahn
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Posts: 1
Default Root cause insight into the common BMW blower motor resistorfailures

On 2/4/2014 8:09 PM, Ralph Mowery wrote:
> > wrote in message
> . ..
>>
>> 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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