Digest for sci.electronics.repair@googlegroups.com - 20 updates in 7 topics

colonel_hack@yahoo.com: Sep 28 10:26AM -0700

keithr0 <user@account.invalid>: Sep 29 05:43PM +1000

On 29/09/2015 12:14 AM, Mike wrote:
> Michael Black <et472@ncf.ca> wrote:
>> He follows the Make culture, doing anything, even pasting together
>> circuitry sold to people so they don't have to solder, is "Making".
 
Come on! This is the 21st century, whipping up an Arduino based
datalogger is just as much "Making" as building a super regen receiver
using tubes, carbon resistors and a solder gun were back in the day.
 
 
> Well, sometimes it does happen! Even an LED/magnet "throwie" chucked
> somewhere up under a bridge can trigger an alert. Not through
> stupidity, as such, just a bit of paranoia!
 
You can make a bomb without a clock, but you can't make one without
explosives. You'd think that the cops would have noticed that, but, then
again, maybe not.
 
I hope those cops never come around to my house, they'd probably think
that it was a terrorist bomb factory, what with all the circuit boards
and wiring lying around.
amdx <nojunk@knology.net>: Sep 29 09:02AM -0500

On 9/27/2015 4:31 PM, John-Del wrote:
>> justify our existence.")
 
> Yeah, I'm sure that was the motivation. And btw, that "clock" looked a lot more like a bomb that the Pop-tart bitten into the shape of a gun looked like a weapon.
 
>All that "clock" needs is some C-4 and it's a bomb. And do you think the CIA won't inspect that "clock" closely when it arrives at the White House?
 
 
Hey Mister president, "can I bring my clock? Um, your not worried that
I would bring a bomb are you?
On entry to the white house, we need to check your clock, "why, it's a
clock! But we need to verify that. "You mean like my teachers?"
 
I'm sure the reaction would be severe if I tried to carry that
(clock) into the white house.
 
 
Mikek
Seymore4Head <Seymore4Head@Hotmail.invalid>: Sep 29 12:32PM -0400

On Tue, 29 Sep 2015 17:43:51 +1000, keithr0 <user@account.invalid>
wrote:
 
 
>I hope those cops never come around to my house, they'd probably think
>that it was a terrorist bomb factory, what with all the circuit boards
>and wiring lying around.
 
No one has ever said the kid had a bomb. The first teacher he showed
it to said that it looked like a bomb and to put it away and not show
it to anyone else. The kid took it to another teacher and plugged it
in the wall so it would alarm during class. He was questioned by
teachers and by the police about whether he brought the clock in to
make it look like a pretend bomb, which is still a crime.
https://www.youtube.com/watch?v=pzUtR5TvuzQ
 
Here is the mayor saying that law enforcement and "numerous" teachers
are receiving death threats over the incident. I have yet to see a
single report about death threats on the news. It seems that death
threats from the "religion of peace" do not fit the MSM narrative.
 
https://www.youtube.com/watch?t=198&v=weTqNxXHLRk
bitrex <bitrex@de.lete.earthlink.net>: Sep 29 08:05AM -0400

On 9/18/2015 11:59 AM, TTman wrote:
> D18/R78/C41 ensures the flip flop powers up in the STOP state.
> For IC3/3 to oscillate at a few Hz, something around there is
> faulty/broken.
 
I found that _both_ the pushbuttons were faulty and the IC had failed.
How annoying.
bitrex <bitrex@de.lete.earthlink.net>: Sep 28 03:06PM -0400

Here's the service manual for reference:
 
http://www.loscha.com/scans/Korg_MS2000_Service_Manual.pdf
 
I replaced C109 with a 100uF electrolytic temporarily, and also found
that the power and ground planes were shorted together. Common mode
choke L10-L12 had apparently burned and shorted, so I've temporarily
replaced it with jumpers.
 
The +7 and +5 rails are up and running now, but the 3.3 volt rail is
still down. I measure about 8.6 volts from positive to negative across
C109, but I'm also seeing about 8.7 volts from the ground terminal of
C109 to the ground fin of regulator IC7.
bitrex <bitrex@de.lete.earthlink.net>: Sep 28 03:20PM -0400

On 9/28/2015 3:06 PM, bitrex wrote:
> still down. I measure about 8.6 volts from positive to negative across
> C109, but I'm also seeing about 8.7 volts from the ground terminal of
> C109 to the ground fin of regulator IC7.
 
There's no continuity between the top of C25 and where C50 would have
been. Guess L13 is smoked as well.. :(
John S <Sophi.2@invalid.org>: Sep 29 01:27AM -0500

On 9/28/2015 2:20 PM, bitrex wrote:
>> C109 to the ground fin of regulator IC7.
 
> There's no continuity between the top of C25 and where C50 would have
> been. Guess L13 is smoked as well.. :(
 
The schematic shows that L10, L11, and L13 are NU (Not Used). L13 is
replaced by a jumper. Is the schematic for your unit accurate?
bitrex <bitrex@de.lete.earthlink.net>: Sep 29 08:01AM -0400

On 9/29/2015 2:27 AM, John S wrote:
>> been. Guess L13 is smoked as well.. :(
 
> The schematic shows that L10, L11, and L13 are NU (Not Used). L13 is
> replaced by a jumper. Is the schematic for your unit accurate?
 
You're right. I believe it's accurate, I was just being dumb. The
common mode choke was just 2 windings - it was scorched and shorted. I
cannot find L13 anywhere on the board. Still, there seems to be a
continuity problem somewhere as the buck switcher is not getting an
appropriate input voltage.
 
I think I'm first going to take the other poster's suggestion,
disconnect the switcher completely and see if I can get the logic
working off a bench supply, as if I can't get it operating that way then
this exercise is really for nothing.
N_Cook <diverse@tcp.co.uk>: Sep 29 10:39AM +0100

Unusual package, I can get hold of the usual 1.25mm pin spacing SMD 8
pin SOIC IC . I might be able to find an exact replacement if I knew the
SMD style code for .75mm spacing, normal width of SOIC IC body but not
so long.
May be about .75mm pitch , not exactly .75, only ruler measurement.
At a pinch I might be able to twist 90 degree each pin axially and
realign for the smaller pitch, and/or grind back the pin width with .5mm
dremmel discs, but very constrained space and an exact replacement would
be a lot easier.
N_Cook <diverse@tcp.co.uk>: Sep 29 11:26AM +0100

Oddly its wider than normal SOIC. Tried grinding and bending pins of a
practise 8pin SOIC and that will work, but I'd like to obtain a proper
footprint replacement, if anyone knows the style, something like QSOP.
N_Cook <diverse@tcp.co.uk>: Sep 29 11:36AM +0100

perhaps TSOP type II, .8mm pitch.
Seymore4Head <Seymore4Head@Hotmail.invalid>: Sep 28 06:28PM -0400

I was listening to him yesterday in the car and a guy called in that
said he was blind.
He was asking questions about using his Apple computer for video
editing.
That doesn't really add up to me.
Smarty <nobody@nobody.com>: Sep 29 05:18AM

> He was asking questions about using his Apple computer for video
> editing.
> That doesn't really add up to me.
 
Blindness is not a binary condition. There are a wide range of deficits
including a somewhat arbitrary "legally blnd" state which differs from one
country to another. There are those whose blindness may be principally in
color perception, night time vision, peripheral vision, etc.
 
The bottom line is that video editing and many other tasks which rely on
vision can be performed by those individuals whose medical and / or legal
situation is accurately described as blind.
"Steve W." <csr684@NOTyahoo.com>: Sep 28 12:42PM -0400

dsi1 wrote:
 
> OTOH, my guess is that a lot of folks will just ignore any fix, if they
> can avoid it. The big question is will they be compelled by the state or
> feds to do this or will this be be treated as just another recall.
 
You won't be able to ignore it. The EPA has a LOT more power than the
NHYSA does. They will simply blacklist the VIN numbers of all the
vehicles that are not in compliance with the regulations.
 
Owners will probably get a letter telling them that they have XXX days
to get to a dealer and have the fix done. If they don't they will get a
letter from the Feds telling them that they are driving a non-compliant
vehicle and that the registration has been suspended.
 
 
--
Steve W.
sms <scharf.steven@geemail.com>: Sep 28 06:18PM -0700

On 9/20/2015 3:49 PM, sms wrote:
 
<snip>
 
I had a smog check this morning on a 2007 Camry. The shop had a new
machine for newer vehicles. Since September 2013, 2000 and newer
vehicles no longer get tested on the dynamometer and no longer get a
probe shoved up their tailpipe. The whole test is done via the OBD-II
port (as well as a visual inspection).
 
For diesel vehicles you can see the details here:
<http://www.smogtips.com/diesel-smog-test.cfm>
 
So clearly VW was not just looking at wheel rotation, they probably
turned on the emission controls whenever they detected something reading
the sensors. I wonder if an ELM327 transceiver or a Progressive
"Snapshot" would have any effect.
dsi1 <dsi1@fishing.net>: Sep 28 04:34PM -1000

On 9/28/2015 6:42 AM, Steve W. wrote:
> to get to a dealer and have the fix done. If they don't they will get a
> letter from the Feds telling them that they are driving a non-compliant
> vehicle and that the registration has been suspended.
 
The way I see it, it's just another recall and the feds should just
grant an exception for the victims of this scam. I think that's an easy
solution to this problem.
"Tom Miller" <tmiller11147@verizon.net>: Sep 28 11:14PM -0400

"sms" <scharf.steven@geemail.com> wrote in message
news:mucoqf$dll$1@dont-email.me...
> on the emission controls whenever they detected something reading the
> sensors. I wonder if an ELM327 transceiver or a Progressive "Snapshot"
> would have any effect.
 
Here's an interesting point. It seems CA has portable roadside emissions
checkpoints that measure the emissions as you drive. I wonder why they
haven't seen a major problem with VW vehicles as they pass these
checkpoints?
 
Maybe it is a minimum difference between a properly working system and a VW
in the fuel economy mode? Like someone else said - is the nominal emission
near zero and 10 to 40 times worse is still an extremely small amount of
NOx.
"pfjw@aol.com" <pfjw@aol.com>: Sep 28 02:27PM -0700

On Tuesday, September 22, 2015 at 12:42:03 PM UTC-4, amdx wrote:
> in them. I thought I was done, listening test showed no output from one
> tweeter, found bulging cap in crossover. Argh!
 
> Mike
You can use two standard caps back-to-back (+ -- +). But they should be 6uF caps. Back to back, they will test out at 3uF. If you screen them carefully, you should be able to get very close to the 2.7 you need. Or, use 2.5uF caps as electrolytics tend to run 'fat' rather than 'lean'. Or, use a film cap, full stop.
 
 
http://www.mouser.com/ProductDetail/Cornell-Dubilier/DME1W2P7K-F/?qs=GfXtfMhyVhhkUS5OI4XuCw%3D%3D&gclid=CjwKEAjwyqOwBRDZuIO4p5SV8w0SJAAQoUSweNlsFGU9403jEo7URCsx-ZcaR5IPgoCvR4HfbhMJjxoCKrrw_wcB&kpid=3343101
 
Polarity will not be a problem.
 
Peter Wieck
Melrose Park, PA
Ralph Barone <address_is@invalid.invalid>: Sep 29 01:52AM

>> old "look"?
 
> Posted without comment :)
 
> http://www.anonpic.com/images/fakecapacitor1.jpg
 
The Rubycon 35V rated caps must be pretty good :-)
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