Digest for sci.electronics.repair@googlegroups.com - 9 updates in 5 topics

thekmanrocks@gmail.com: Jul 14 05:20AM -0700

WHAT THE ?
 
 
This is JVC's RX-515V Pro Logic Surround Receiver, 80W
mains, 20W Center, 20W Surrounds. 1994 model I believe.
 
 
The first one, I bought in 1995 new, blew center channel
last summer. I plugged the center speaker into a mains
output to check it - got sound. Pressed Test, got noise
in all speakers exc center.
 
 
I was lucky to EBay a replacement from Texas, and it served
me well until just today. All other speakers, features work.
Just no center.
 
 
I do not know if the problem is on the internal input side
of the surround, or the output side. I would appreciate
some help fixing this as I really like the features and extra
inputs these older units have compared to today's.
 
 
Why does the same thing keep quitting on this model?
N_Cook <diverse@tcp.co.uk>: Jul 14 02:05PM +0100

> some help fixing this as I really like the features and extra
> inputs these older units have compared to today's.
 
> Why does the same thing keep quitting on this model?
 
Same central speaker with some intermittent short on the VC ?
jurb6006@gmail.com: Jul 13 08:16PM -0700

> Human Resource Management, 14th Ed Mathis Solution manual and test bank is now available for sale. Buy now at affordable prices. Contact us to buy this today : testbanksbiz[at]gmail.com. replace [at] with @ in the email address
 
Yeah, I'll be suire to do that asshole.
 
Oh, and y'all saying I am encouraging these fucking nigger ass spammers, no I am not, they never read any replies. FUKUM.
 
Every advertiser everywhere is a piece of fucking shit. they pollute our world hawking their wares. They all nbeed to be fucking killed. I am goddamn tired of seeing billboards all over the place fucking up the landscape, I am tired of a commercial every four minutes on ANY media. I am tired of it, ALL OF IT. These motherfuc kers don't get the idea that we HAVE enouigh monitors, computors, cars, TVs and fucvking hwo knows what else. WhenI need one I'll call yo. Son of a bitcvh.
thekmanrocks@gmail.com: Jul 13 11:52AM -0700

Ahhhh! Now makes sense!
 
lol!
Rev. 11D Meow! <rev.11d.meow@gmail.com>: Jul 13 05:54PM -0700

On Mon, 13 Jul 2015 06:09:03 -0700 (PDT), Ivan Vegvary
>Why don't they have Blu Ray? Seems so simple. Such a small fractional cost of an item that could cost thousands $$.
>Would be nice to watch TV and not disturb others.
>Ivan Vegvary
 
Here's a good place to start research on TV Headphones.
They don't have to be Bluetooth to be wireless.
 
http://www.smithgear.com/tv-headphones.html
Baron <baron@linuxmaniac.net>: Jul 13 08:01PM +0100

Phil Allison prodded the keyboard with:
 
>> still shock the crap out of you due to that voltage.
 
> ** Electricians once regularly used 40W bulbs in a protected, hand
> held fittings to test if circuits were live - see pic.
 
https://img1.etsystatic.com/068/0/6320982/il_fullxfull.780718127_nbxf.jpg
 
> The AC plug was replaced with two probes in the examples I saw.
 
> I guess it was important to test the bulb before each use ...
 
> ... Phil
 
I have two of those test bulbs ! I forget who made them. But if
there is really voltage there they don't lie.
 
--
Best Regards:
Baron.
Dimitrij Klingbeil <nospam@no-address.com>: Jul 13 11:02PM +0200

On 13.07.2015 08:58, N_Cook wrote:
> trenches, would confirm that any power cables they came across that
> should be dead , were dead or not. Using a cartridge powered cutting
> blade , that was explosively shot across the cable, severing it.
 
Yep, that instrument used to be called a "Kabelbeschußgerät" here in
Germany. Nowadays they fall under the firearms regulations, which made
them a royal pain in the back end to own and operate, so they're
actively being replaced by remote-operated pneumatic equivalents now.
 
Dimitrij
M Philbrook <jamie_ka1lpa@charter.net>: Jul 13 06:55PM -0400

In article <82f2ea2f-dc27-4e51-92c9-6f2c717d2f02@googlegroups.com>,
jurb6006@gmail.com says...
 
> >Jamie "
 
> To say the least, this is not enticing me to buy one. One kilohertzz square wave at 400 mV amplitude positive going, with a scope freewheeled into sync and DC coupled. The most effective lytic checker in the world once you lern to read it.
 
> Once you learn to read it. I invented it, I used it to great profit and productivitly and I taught others how to use it, but only where I worked.
 
I doubt many much that you invented the process.
 
That trick dates back to the days of early electronics, very early..
 
 
> Now that I am older and ready to die Imight be tempted to reveal all the details. the bottom line is that tis thing read directly RIGHT NOW, no waiting for some stupid program to run. Like the one they had at opjne job, the son of a bitch sat there and said "DISCHARGING". The fuck you cre if it is charged ? Just read the AC resistance.
 
> Well my scope doodad does exactly that and if the cap is charged then the scope will still read correctly on AC and not iondicate the cap is charged. BTW, does it occur to anyone that IF the cap is charged that it holds a charge and therefore is probably good ? Or are you testing for 0.05 ohms of ESP in the filter caps of an audio amp and giving name to the term "audiophool" ?
 
> It is amazing they do not teach this. you put a signal to a device - the DUT - and then measure what is does. What is not simple about that ? God damn, I figured out this cap checker witht eh scope thing when I was about 16. ON MY OWN. Fuck Dick Smith. Well not really but you know what I mean. In fact I made a trade with Bob Parker. Some knobs for a Ysamaha receiver for an elcheapo boomerang. Hey, it came back a few times which proved it was not just a stick, but then
the kids got ahold of it and it was then a stick. Know what I mean ?
 
Back then it may have worked with out worry, most likely due to the
fact that many square wave generators were not able to generate the
raise time like they do today. There ware other things to consider now.
 
Jamie
dplatt@coop.radagast.org (Dave Platt): Jul 13 11:59AM -0700

In article <55a25dd1$0$13652$4c5efc6d@fastusenet.org>,
>circuit. A bad 2.2 meg resistor caused a B&K 'scope of mine to not quite
>focus. The focus pot ran out of range first. Replacing the resistor fixed
>it.
 
The Tek 2235 and its cousins have a fairly common problem show up.
The focus chain uses high-value carbon-composition resistors, which
tend to shift value with age... the focus pot runs out of range as a
result.
 
I bought a 2235 with this problem at a local flea market for all of
$60. An hour's work and a few replacement resistors fixed it.
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