Digest for sci.electronics.repair@googlegroups.com - 11 updates in 3 topics

Look165 <look165@numericable.fr>: Jul 23 09:32AM +0200

a cleaning tape (cassette)
 
 
Phil Allison <pallison49@gmail.com>: Jul 23 03:14AM -0700

micky wrote:
 
-----------------------
 
 
 
> OR it can become too dirty to clean!!!! Is that true?
 
> The car is from 2004 and i'm guessing it's never had its cassette drive
> cleaned, but it plays fine. May i wait another 13 years?
 
** Got the tiniest idea what happens if you never clean the pinch roller??
 
Obviously not.
 
..... Phil
tabbypurr@gmail.com: Jul 23 08:16AM -0700

On Sunday, 23 July 2017 08:32:55 UTC+1, Look165 wrote:
 
> > Cleaning the heads is more dependent upon the quality of the tapes than anything else. At this point, I would use a "WET" cleaner if available. You take the chance of disturbing what little dirt that is there as well. Be careful. If you have any doubt, remove the unit from the vehicle and have a pro clean it. There is a good chance that the belts are nearing their end of life too. These can be changed and the pinch roller can be treated to get it back to normal too.
 
> > Dan
 
> a cleaning tape (cassette)
 
is as much use as tits on a bull.
rbowman <bowman@montana.com>: Jul 22 10:12PM -0600

On 07/22/2017 11:52 AM, Ed Pawlowski wrote:
 
> I forget the details, but 60 was better than 70 by a couple of mpg.
> Problem is, I prefer driving 75. If I could get away with it I'd go 85+
> but don't want to pay the fines.
 
At under 70 my car usually is in the 35 mpg + range; at 80, it is more
like 32. I get even better mileage in Oregon with its 55 mph speed
limit. I also get bored out of my mind. There isn't a whole lot of
anything between Ontario and Bend but I figure as soon as I get up to a
decent speed a OSP cruiser will materialize from the sagebrush.
 
That stupid speed limit is the least of Oregon's problems.
rbowman <bowman@montana.com>: Jul 22 10:17PM -0600

>> Which is the entire point after all.
> Roger, me lad - you wouldn't happen to be a britiah trained engineer,
> now, would you?? In what discipline of engineering?
 
Engineering Management, I'm thinking.
rbowman <bowman@montana.com>: Jul 22 10:33PM -0600

On 07/22/2017 08:40 PM, Mad Roger wrote:
> For a typical 20-gallon fill, how many gallons off can reality be, plus or
> minus from the indicated reading on the pumpmeter?
 
http://www.npr.org/templates/story/story.php?storyId=5304258
 
The article talks about Washington but most states have a similar
protocol. Pump 5 gallons of gas. 1 gallon is 231 cubic inches, so that
is 1155 cubic inches. The volume must be within 6 cubic inches or
roughly 0.5%. I'll let you do the math for 20 gallons.
 
http://billingsgazette.com/news/state-and-regional/montana/customers-rarely-shorted-at-the-gas-pump/article_3849a455-6151-515e-ae6a-2d65351736b4.html
 
Montana uses the same test. Note that he estimates 2 to 3% of the pumps
fail and have to be repaired and also says with normal wear the pumps
tend to dispense more than stated but some may dispense less. That's
where averaging over a number of tanks comes in unless you fill up at
the same pump at the same station every time. I certainly don't.
clare@snyder.on.ca: Jul 23 12:39AM -0400

On Sun, 23 Jul 2017 02:40:10 -0000 (UTC), Mad Roger
 
>I love that you are the only one quoting actual numbers and not pulling
>them out of your butt to answer the question!
 
>But your numbers confuse me because they seem to be in cubic inches.
You are the engineer, son of physics majors - figure it out!!!
>You also mentioned that metric pumps are more accurate, but that's
>impossible, simply because the pump is as accurate as the pump can get,
>which, we can assume, is a mechanical thing (and not a metric thing).
You fail to grasp the simple fact that a tenth of a liter is a whole
lot less than a tenth of a gallon???? Accuracy of READING the pump is
therefore about 4 times more accurate with a metric pump, because your
read error of +.1/-0 units is based on the much smaller unit.
>the error is four times less for a given liter versus a given gallon but
>that's not saying it's more accurate. It's just saying the volume is less
>so the resulting error is less.
 
and your engineer's understanding of accuracy does not equate to a
smaller error?????????
 
>Anyways, can you just summarize what the error is for a typical USA pump in
>gallons?
As good as Less than 1/10 of a percent according to the information
quoted, with a very few as bad as 1.82%. An american gallon is 128
fluid ounces, so 1.82% of 128 ounces is 2.23 ounces maximum error,
+/1, with most being within .5%, or 0.64 ounces per gallon
 
>For a typical 20-gallon fill, how many gallons off can reality be, plus or
>minus from the indicated reading on the pumpmeter?
The poorest pump checked in that data would be +/- 44.6 oz per 20
gallon tank - the average about +/- 12 ounces.
ASS U MEing the error is randomly distributed,around zero, your
chances of the error being anywhere CLOSE to even the 12 ounces is so
small as to be virtually insignificant unless you always used the same
pump - in which case it is totally immaterial if used for comparative
purposes.
 
For an engineer, you sure have a poor grasp of the concepts.
Bill Vanek <bilvanek2@invalid.com>: Jul 22 09:45PM -0700

On Sat, 22 Jul 2017 22:12:26 -0600, rbowman <bowman@montana.com>
wrote:
 
>anything between Ontario and Bend but I figure as soon as I get up to a
>decent speed a OSP cruiser will materialize from the sagebrush.
 
>That stupid speed limit is the least of Oregon's problems.
 
Where is their limit 55?
rbowman <bowman@montana.com>: Jul 23 12:12AM -0600

On 07/22/2017 10:45 PM, Bill Vanek wrote:
>> decent speed a OSP cruiser will materialize from the sagebrush.
 
>> That stupid speed limit is the least of Oregon's problems.
 
> Where is their limit 55?
 
The last time I was there US20, US395, and other 2 lane roads in eastern
Oregon. Apparently the raised it to 65 in March of 2016 but are rolling
it back in some places.
 
http://www.oregonlive.com/commuting/index.ssf/2016/06/oregon_rolls_back_speed_limit.html
 
but according to this the limit is now 70 on rural roads:
 
http://www.speed-limits.com/oregon.htm
 
70 on Rt. 20 would make a lot more sense if that is indeed what it is
now. I'm not planning to check it out personally though.
Vic Smith <thismailautodeleted@comcast.net>: Jul 23 06:20AM -0500

>>> better.
 
>>Does your tripmeter have a decimal place and digits after that decimal
>>place?
 
<snip>
 
>money, completely decommissioned and scrapped - starting over with
>someone who knew what thet were doing, and how to do it - engineer or
>not.
 
You know, this guy has a hard-on against "non-engineers" measuring their MPG.
Rickman above told him he uses his odometer, then he goes on about tripmeters.
I answered his main complaints in another post. That exchange went like this:
 
">+ Tripmeter accuracy is what in the average car over a 300-mile tank?
>+ Owners ability to "match" the previous level of fuel is what?
>+ Gas station pump reading accuracy is what?
 
I never used the tripmeter for MPG, because I never bothered testing them with mile
markers.
Matching gas level is trivial - and it only has to done at the beginning and end of the
trip.
Gas station pumps - I assume they are accurate, and can't control that anyway.
I'm confident that my measurements are accurate to within .1 MPG."
 
His response to me totally ignored those responses, and he posed the same questions again!
Then, for some reason, he stated talking about speedometers.
He's a troll.
John-Del <ohger1s@gmail.com>: Jul 22 09:13PM -0700

On Saturday, July 22, 2017 at 3:32:11 PM UTC-4, ABLE1 wrote:
 
> properly to the leads.
 
> Is there some trick that needs to be applied somehow to get this
> soldered properly??
 
You now know about the plated-through holes, but be aware that while they show continuity now, they may not after soldering. Some manufacturers do not feature sturdy plating in the holes (Samsung is one), and the added leaked electrolyte can aggravate it.
 
Preheat the board, apply solder flux, use sufficient solder tip heat and carefully insert the capacitors through the holes. Don't force them like you might do on a single sided board.
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