ETC worries , then i guess no electronic steering for you ....
There are millions of cars running around without issues, Toyota biggest issue was their software and hardware , no safety protocols , unbelievable. With correct software , even with whiskers , proper software would have prevented such issue..
You sayin' idiots involved.....my car has no such issuesETC worries , then i guess no electronic steering for you ....
There are millions of cars running around without issues, Toyota biggest issue was their software and hardware , no safety protocols , unbelievable. With correct software , even with whiskers , proper software would have prevented such issue..
.Dan.
As far as I am aware NASA still wont take the risk and recommend any conformal coating as being 100% certain of stopping the whiskers growing, and using proper solder is still the only 100% reliable way.
JN
BGAs with lead free solder are OK, the balls are lead free so you don't get any real problems as long as the process is OK, its using the BGAs on mil/aero assemblies where you have to you can have problems, the lead free balls don't get hot enough during the lead process so the intermetallics don't form properly and you get a greater instance of dry joints where visual inspection shown no problems but some balls will not be connected. When this first came to light there were proposals for a hybrid process, a bit hotter than normal lead/ a bit cooler than lead free. We tested it, but had more problems and the process had to be absolutely spot on, even then the risk of bad joints was to high, and re-working BGAs for these sort of assemblies was frowned upon, we were only allowed to put a lot of devices through a maximum of 2/3 heat cycles for long term reliability.
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You sayin' idiots involved.....my car has no such issues
Dan.
Yeah those Bybees will save the day
I am quite aware of this, the problem is most components are now unavailable with tin/lead finishes, especially BGA's, which have to be re-balled and put through a heat cycle. So I have been involved with a couple of trails and investigations over the lase several years where going lead free has been investigated, the risks and long term reliability though are not there.
The other problem is COTS products, I have worked on a couple now where most customers require tin/lead solder but some (in Europe) want RoHS compliant assemblies!
The whole lead free thing for electronics has been a bit of a pyrrhic victory for the 'Lentil eaters in baggy jumpers', they have traded a tiny bit of lead (that wouldn't really get into the environment) for a 20-40 deg C increase in reflow temperature, thus consuming more power and increasing the industry's carbon footprint, a well though through campaign.
Could have some new reading material, soon, to recommend to people: The Art of Electronics 3rd edition finished writing and copy-editing - Page 1.
Defects in film capacitors - capacitance loss.
Some time ago defects in film capacitors were discussed. Today, purely by iincident, I stumbled upon this web page:
failed foil capacitor from a speaker cross over network
Some time ago defects in film capacitors were discussed. Today, purely by iincident, I stumbled upon this web page:
failed foil capacitor from a speaker cross over network
Who can tell how well made any component is? It did last 20 years though and who knows what sort of abuse the listener subjected it to during that time. Sure maybe the caps weren't rated properly for voltage it could handle.
" A measurement on the tweeter terminals with an oscilloscope shown at once, only some poor millivolts even with a wide open amplifier volume. Error must be somewhere between amplifier and terminals."
I don't think I'd want him testing my speakers with a wide open amp volume. Imagine if the faulty caps suddenly arced and allowed full volume to the tweeters........bye bye tweeters. Reminds me of people who get tired of their fuses popping and wrapping them with tin foil. "Now why did the magic smoke escape and now nothing powers up?" sheesh.Its clearly a metallized film cap where the seal was not adequate and the metalization is not there any more. Calling it a foil cap in the web page is misleading. The metalization layer is very thin and will oxidize quickly if exposed. A foil cap has much more metal and won't fail this way. However a breakdown in the insulation will be come a short. On a metalized cap that will burn off, on a foil cap its toast.
We use aluminum metalized mylar film in the cryogenic multilayer insulation. When moisture gets involved, the aluminum goes away exactly like that picture.
I would guess an end seal gone did that.
jn
Thinking some more about cars, with older cars if something vary strange happened, you could use the mechanical ignition key switch to turn the engine off. True there were problems doing this, you needed to reposition the switch so the the steering column didn't lock and you lost power assist to the steering and brakes.
We just drove a new keyless rental car with no user's manual (US rentals don't come with instructions) and getting the engine turned off was a trick.
We just drove a new keyless rental car with no user's manual (US rentals don't come with instructions) and getting the engine turned off was a trick.
New cars are a joke. Way over priced. Those chipped keys are horrible. Lose it and you end up paying the dealership hundreds of dollars so you can start your own car. It's a scam. Nobody wants to steal your vanilla car/suv/truck. Want to work on your own car? Good luck with that, sensors and computer controlled gadgets galore.
Pot shouting, funny how that works with the ladies, anyway had you on such for about a year now, unfortunately i see when not signed in ..
This message is hidden because DavidL is on your ignore list.
Now run off and complain again , or are you waiting on John so you can hurl your usual at him ....
This message is hidden because DavidL is on your ignore list.
Now run off and complain again , or are you waiting on John so you can hurl your usual at him ....
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a.wayne,
You got to admit things were a lot easier to work on with older cars. I don't think my hands have gotten bigger but the spaces to put them sure got smaller! I still work on new cars but without scan tools and a good understanding of how things work these days, the days of shade tree mechanics is over. What gets me are the number of mechanics that don't have a clue when it comes to the electronics and troubleshooting a bad sensor if the computer doesn't throw a code. I guess it has helped to stay up on what is going on, it sure saves me lots of money.
ps. Still not sure I like the fly by wire steering though, that one I still think should be mechanical when all else fails.
You got to admit things were a lot easier to work on with older cars. I don't think my hands have gotten bigger but the spaces to put them sure got smaller! I still work on new cars but without scan tools and a good understanding of how things work these days, the days of shade tree mechanics is over. What gets me are the number of mechanics that don't have a clue when it comes to the electronics and troubleshooting a bad sensor if the computer doesn't throw a code. I guess it has helped to stay up on what is going on, it sure saves me lots of money.
ps. Still not sure I like the fly by wire steering though, that one I still think should be mechanical when all else fails.
Yes, 2004 is the cut off if you like doing your own stuff and not code literate. It depends on how much hands on you are and how long you plan on keeping your cars. If you trade or change every 3-5 yrs, this is a none issue, if you want to hotrod, of course basic is easier, but it will never perform like modern..
PS: Feel the same, but pretty soon everyone will be , (ESC)only way to get the electronics to take over and park the car when the "man" wants you to stop, of course sold to the public as crash avoidance ...
Get a Maxheadroom Dundee special ..
PS: Feel the same, but pretty soon everyone will be , (ESC)only way to get the electronics to take over and park the car when the "man" wants you to stop, of course sold to the public as crash avoidance ...
Get a Maxheadroom Dundee special ..
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