Digest for sci.electronics.repair@googlegroups.com - 16 updates in 5 topics

John Robertson <spam@flippers.com>: Sep 30 10:03AM -0700

On 09/30/2015 3:20 AM, Phil Allison wrote:
 
I feel your pain!
 
In my business (fixing classic arcade/amusement games) I collect as many
test fixtures as I can, plus host a mail list devoted to technical tools
(mostly Fluke microprocessor test gear) in an effort to get information
out there to save our games.
 
I have charged customers the time it takes to make a test harness so I
can service their game board - most understand the problem once it is
explained clearly.
 
John :-#)#
 
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
Phil Allison <pallison49@gmail.com>: Oct 01 12:02AM -0700

John Robertson wrote:
 
 
> I have charged customers the time it takes to make a test harness so I
> can service their game board - most understand the problem once it is
> explained clearly.
 
** Never needed to go quite that far, myself.
 
I have one of nearly every kind of AC power lead: the various IECs, PowerCon, XLR/LNE and even a large Bulgin for old Marshalls - plus a few variable bench PSUs that can power-up most things, including channel modules from mixing desks - convenient when the desk is really large.
 
A 1GHz frequency counter shows if a radio mic is transmitting and on what frequency, but is no help when the issue is sound quality.
 
Long ago, I built a balanced pre-amp / headphone-amp combo as a substitute for a mixing desk - allows me to test any kind of mic, direct box or radio mic receiver.
 
However, I am still a bit stuck if some item only operates with a Midi or DMX input.
 

 
.... Phil
jurb6006@gmail.com: Oct 01 09:04AM -0700

About the MIDI, not long ago I got one needed a USB jack replaced. I didn't realize at first it was not a real keyboard, only a MIDI controller. Isn't there some sort of universal software out there ? Like maybe on a driver disk for a soundcard ? Isn't it pretty similar to the older style that used the game/joystick port ? If your PC can play a .MID file, shouldn't it work ?
 
The wireless mic problem might fix itself forya. I got one in that had one bad mic, and looking t it, it isn't going to get fixed. Eventually the other mic will get broken and then there is a spare receiver. This recent one was an RSQ and apparently had all the channels. It could search for the frequency or you could select it manually. Those things probably all operate on one band. Here, they seem to be around 690 MHz, might be different in other countries. But it seems if you get the right receiver for your country it might just do the trick.
 
Of course then they bring a drum machine but no heads, or drum heads and no machine, you know how customers are.
Cydrome Leader <presence@MUNGEpanix.com>: Sep 30 10:22PM

> the people in town being stupid. Everybody, everybody in town had clear signs
> of lead exposure. I got out of there as quickly as I could and I did not look
> back.
 
can you elaborate on this?
jurb6006@gmail.com: Sep 30 07:59PM -0700

Actually the physiological effects of lead had absolutely nothing to do with its removal from gasoline.
 
It was the fact that is would screw up the catalytic convertors on cars. Lead abatement in paint, apartments and all that was a totally separate issue.
 
And if your kids are eating paint chips off the walls, you might want to watch them better, or possibly feed them better. Remember, they pick your retirement home.
jurb6006@gmail.com: Sep 30 08:07PM -0700

Oh and BTW, did anyone get smarter ? People are fucking more stupid than ever.
 
Cause and effect matter not right now, because the fac is it did not work. They are getting dumber and dumber.
kludge@panix.com (Scott Dorsey): Oct 01 09:57AM -0400

>> of lead exposure. I got out of there as quickly as I could and I did not look
>> back.
 
>can you elaborate on this?
 
On scary battery plants or MBTE exposure, or long-term lead exposure rates?
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
Cydrome Leader <presence@MUNGEpanix.com>: Oct 01 02:53PM


>>can you elaborate on this?
 
> On scary battery plants or MBTE exposure, or long-term lead exposure rates?
> --scott
 
both-
 
I imagined you visited some dirty smelting town where everybody was a
mouth breather caked in filth. The battery plant must have been a pleasant
place too.
 
Gary, IN had the permanent pollution cloud over it from heavy until maybe
the early 2000s. The smell was awful.
kludge@panix.com (Scott Dorsey): Oct 01 11:17AM -0400


>I imagined you visited some dirty smelting town where everybody was a
>mouth breather caked in filth. The battery plant must have been a pleasant
>place too.
 
The battery plant was in a town called Leeds, Alabama, and I have no idea
what happened to it. I was born in Pittsburgh so I have a pretty high
tolerance for industrial waste in the air, but lead is scary. The company
there had sent recruiters to gatech and as a new grad I was trying to get
as many plant tours as possible just to see what the industry was like.
 
I still do try to get plant tours whenever I can.
 
Here is some recent but pretty complete data on lead levels in children:
http://www.cdc.gov/nceh/lead/data/national.htm
 
And here is a good overview on why any lead is bad:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2533151/
 
I don't have a good online citation on how blood lead levels dropped when
leaded gasoline was banned, but "Cities: An Environmental History" has
an overview.
 
>Gary, IN had the permanent pollution cloud over it from heavy until maybe
>the early 2000s. The smell was awful.
 
 
But if it was anything like Pittsburgh, the sunsets were beautiful. My
aunt is still upset that they closed the mills down and now with no sulfur
in the air she keeps getting mildew on her roses.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
"I hate front wheel drive, most torque must go to the rear" <isquat@gmail.com>: Oct 01 06:26PM +0300

On 9/19/15 08:12, mike wrote:
> original driveablilty and economy.
> Since that's likely not possible, what do you do now?
> Force them to replace the whole car?
 
Yeah. Do a buyback and sell them where it's bloody hot
3rd world countries in africa and asia would rejoice
(australians would too I'm sure)
"I hate front wheel drive, most torque must go to the rear" <isquat@gmail.com>: Oct 01 06:31PM +0300

On 9/19/15 15:25, Stormin Mormon wrote:
 
> I'm likely mistaken, but my gut sense is that lower emissions
> means lower performance, and lower mileage. My guess is that
> the "fix" will be a downgrade of some kind.
 
The proper fix would be to buy the cars back from the (willing) owners
at bluebook and sell them to the (3rd world) countries that do not
participate in the smear campaign against VAG and could not care less
about the emissions.
An even more proper fix would be for VAG to withdraw from the american
market altogether.
There are lots of other markets where you do not have to make
emissions claims at all and that would appreciate the 4 banger
[turbo]diesels from VAG
Bill Martin <wwm@wwmartin.net>: Sep 30 03:26PM -0700

On 09/30/2015 05:19 AM, JC wrote:
> arcing. Also the vertical output chip fails so you will get a trace but
> no deflection. If you can go over all the joints carefully you might
> have an easy repair.
 
Nice to know. Thanks for the info.
"Ian Field" <gangprobing.alien@ntlworld.com>: Sep 30 07:42PM +0100

"bitrex" <bitrex@de.lete.earthlink.net> wrote in message
news:5601ad59$0$5917$4c5ecfc7@frugalusenet.com...
> around in the case.
 
> I have little experience with tantalum capacitors. Any suggestions for a
> more reliable replacement?
 
You can get MLCC capacitors as big as 180uF - but it won't fit in the
original space.
 
They're mostly advertised as SMD, but that certainly won't fit - a few
suppliers offer resin dipped leaded versions that you could form the leads
to meet the pads.
 
Aluminium electrolytics of any kind are a no no! - there was much chatter
about organic semiconductor electrolytics a decade or so ago, that were
claimed to be as good as tantalum, but it lately seems to have gone very
quiet on that front.
 
Tantalum electrolytics are *VERY* intolerant of reverse voltage, even just a
little bit makes them go leaky. When the normal supply comes back - if it
can shift much current; the tantalum goes off like a match head!
John Larkin <jjlarkin@highlandtechnology.com>: Sep 30 12:15PM -0700

On Wed, 30 Sep 2015 19:42:56 +0100, "Ian Field"
>about organic semiconductor electrolytics a decade or so ago, that were
>claimed to be as good as tantalum, but it lately seems to have gone very
>quiet on that front.
 
The polymer aluminums are really good. Low leakage, low ESR, don't dry
out.
"Ian Field" <gangprobing.alien@ntlworld.com>: Sep 30 08:33PM +0100

"John Larkin" <jjlarkin@highlandtechnology.com> wrote in message
news:06do0bta4cb3mng54mmqj1a2pr5n2csj4n@4ax.com...
>>quiet on that front.
 
> The polymer aluminums are really good. Low leakage, low ESR, don't dry
> out.
 
Saw an article about those a while ago - did they ever take off?
 
The organic semiconductor variety were supposed to be the "dog's nuts" - but
all the hoo ha seemed to mysteriously fade away.
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Sep 30 03:14PM -0400

On 09/28/2015 10:56 AM, JC wrote:
 
> There's a guy here with one, recent blog, maybe you can help each other
> out.
 
> http://jimmyauw.com/2015/03/01/hp-agilent-3561a-dynamic-signal-analyzer/
 
And if not, I posted it here:
 
http://electrooptical.net/www/sed/HP3561A_ServiceManual.pdf
 
Cheers
 
Phil Hobbs
 
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
 
160 North State Road #203
Briarcliff Manor NY 10510
 
hobbs at electrooptical dot net
http://electrooptical.net
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