Digest for sci.electronics.repair@googlegroups.com - 25 updates in 9 topics

Stormin Mormon <cayoung61@hotmail.com>: Aug 13 05:50PM -0400

On 8/13/2015 3:42 PM, MNMikeW wrote:
 
> I'd like to use a solvent (I already tried water but I want to do a
> better job) that dissolves the stuff so knowing the chemistry might help.
 
> Do you have any idea what the chemical composition of that stuff is?
 
What kind of device that won't let you
get near it?
 
Caig DeOxit might help. I got some for
a 1/8 phono jack, and surprise surprise!
Seems to help a lot. Might help with
battery corrosion, also.
 
Ebay for about $15 shipped. Well worth it,
in my case.
 
--
.
Christopher A. Young
learn more about Jesus
. www.lds.org
.
.
Rachael Madcow <rachael.madcow@pms-nbc.nut>: Aug 13 07:54PM -0400

On 8/13/2015 5:50 PM, Stormin Mormon wrote:
 
> a 1/8 phono jack, and surprise surprise!
> Seems to help a lot. Might help with
> battery corrosion, also.
 
Caig DeOxit is the electronic technicians holy water.
MNMikeW <mnmiikkew@aol.com>: Aug 14 04:31AM

On Thu, 13 Aug 2015 14:52:36 -0500, Thane wrote:
 
> It's a mixture of potassium hydroxide and potassium carbonate.
 
> Check this article.
 
> http://www.thenakedscientists.com/HTML/questions/question/1000207/
 
That was an interesting article, which also said that it could be a
mixture of ammonium chloride and manganese dioxide in the comments.
 
It seems that lemon juice or vinnegar (ie weak acids) are the way to
clean it up chemically, based on that article.
MNMikeW <mnmiikkew@aol.com>: Aug 14 04:35AM

On Thu, 13 Aug 2015 12:52:50 -0700, John Robertson wrote:
 
> off with a mild solution (50/50) of white vinegar and water, scrub, and
> rinse with clean water carefully.
 
> http://flippers.com/battery.html
 
That article was nice, but I'm always suspicious when someone suggests
idiotic things such as "pure water" (goes with "kosher salt" in my book,
or with "organic eggs", etc.).
MNMikeW <mnmiikkew@aol.com>: Aug 14 04:38AM

On Thu, 13 Aug 2015 17:50:27 -0400, Stormin Mormon wrote:
 
> Caig DeOxit might help.
 
The MSDS is one of the most generic I have ever seen.
http://www.xerox.com/downloads/usa/en/i/i5008.pdf
 
No telling what it's made of.
MNMikeW <mnmiikkew@aol.com>: Aug 14 04:39AM

On Thu, 13 Aug 2015 19:54:43 -0400, Rachael Madcow wrote:
 
> Caig DeOxit is the electronic technicians holy water.
 
The MSDS didn't say what it's made of.
Any idea?
MNMikeW <mnmiikkew@aol.com>: Aug 14 04:40AM

On Thu, 13 Aug 2015 17:50:27 -0400, Stormin Mormon wrote:
 
> What kind of device that won't let you get near it?
 
The AA battery was in a deep slot where you can't get a finger or brush
easily in there to clean the alkali, but you can get a liquid (such as
vinegar in there).
"Ian Field" <gangprobing.alien@ntlworld.com>: Aug 10 05:20PM +0100

"Michael Black" <et472@ncf.ca> wrote in message
news:alpine.LNX.2.02.1508092125250.25787@darkstar.example.org...
> But now, the volume control may not be a suitable marker, the control may
> not be attenuating the audio signal, but varying a DC voltage to control a
> stage that is controlling volume.
 
Most of the older shirt pocket items had about 4k7 volume pot, usually this
is too low for most signal sources you might want to patch into it.
 
My solution is to build a JFET source follower onto the input, you can use
the pot as the source resistor, in front of the JFET you only need a
gate-leak resistor and coupling cap.
amdx <nojunk@knology.net>: Aug 10 08:59AM -0500


> The system is in a van. In the beginning wire 2 sizes larger than factory eg Hella wires seemed adequate then Liebermann suggested Powerstream for a kayak inverter. Once there I found the wire size calculator then Hella's point that a small voltage drop from 12V looses 30% of the light source.
 
> The alarm sirens and horn are powered now.
 
> Relays work with 8 and 10 Ga using the smaller wire for a signal.
 
If by signal you mean the wire that energizes the coil, it can be a
lot smaller than 10ga. The coil may draw something like 120ma, so the
wire diameter can be small.
 
There are two ways to power a relay.
1) You connect one side of the coil to ground and then switch +12V to
the other side.
2) You connect one side of the coil to +12V then switch the other side
to ground.
A diode will allow current to flow if the voltage is higher on the
anode than on the cathode. Current will not flow if the voltage is
higher on the cathode than on the anode.
 
Has your original question been answered?
 
If you want an answer you need to ask one question and give enough
details so we know what you are trying to do.
 
Mikek
 
 
 
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John Robertson <spam@flippers.com>: Aug 13 11:08AM -0700

Hi Angus,
 
For your trip, (f)light reading for Andre?
 
http://www.popularmechanics.com/flight/a15172/learning-to-fly-part-one/?mag=pop&click=c1_article_articles_yr_1
 
John :-#)#
John Robertson <spam@flippers.com>: Aug 13 11:10AM -0700

Crap - private email hiccup.
 
Sorry!
 
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."
David Lesher <wb8foz@panix.com>: Aug 13 05:46PM

The bigger issue is the invasivness of the minute by minute monitoring the
meters provide. Turns out it's a great way to be Big Brother.
 
--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
David Lesher <wb8foz@panix.com>: Aug 13 05:52PM


>Electric meters are likely a Zigbee (peer to peer) network and eventually communicate via a cell phone data stream. The meters are TWO-WAY. The power company can disconnect power remotely.
 
>Water meters have batteries. Supposedly they are "truck" activated and only talk back when prompted. Yes, they have a battery.
 
>The gas meters, I don;t know, but they may operate the same way as the water meters. They contain batteries.
 
The big stupidity in PGE-land is while the line-powered KWH
meters do peer-to-peer to the node with cell backhaul; the gas
meters, on battery power, must talk straight to a node...needing
far more power.
--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close..........................
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433
"pfjw@aol.com" <pfjw@aol.com>: Aug 13 09:22AM -0700

On Thursday, October 2, 2014 at 9:27:08 AM UTC-4, William Sommerwerck wrote:
 
> I'm not sure that's true in the US. Even giving away copyrighted material is
> illegal, I believe.
 
No, and yes, depending on the specific downline use (in the US).
 
If used to generate revenue or to avoid fair payment for information. Example: I copy the NFL Superbowl on a DVD for later use in my home for my friends and family. LEGAL. And I may use that DVD as often as I choose for that purpose. I give a copy of the DVD to my brother in law, and he takes it home for his use only. Legal. It is a very grey area if he were to pass on a copy as it may pass beyond the 'time-shifting/fair use' rules.
 
I copy the NFL Superbowl onto a DVD and give it to a friend of mine who is the owner of local sports-bar. He then plays it for his customers. ILLEGAL. It may be implied that the use of that DVD is to generate revenue by attracting strangers to a commercial venue. The sports-bar owner should purchase his own copy from NFL Films for that use.
 
In the US, sharing copyrighted material *in whole* (what good is an incomplete manual) for business purposes is flatly illegal. For an example of how that works, look at some proprietary software - it is sold "by the seat". A user may transfer the software onto multiple computers, but only those for his personal use. He is one "seat".
 
Peter Wieck
Melrose Park, PA
Tim Schwartz <tim@bristolnj.com>: Aug 12 02:11PM -0400

On 8/11/2015 3:51 PM, Nick wrote:
> assemblies? Is there an easy way to tell a fake from an original?
 
> Any ideas?
 
> Nick
 
Nick,
 
Genuine Sony KSS-240A pick ups have 3 pots on the board, and the
optical chip is 14 or 16 pins (I can't remember), where as most of the
'aftermarket' ones have 8 pin IC's. That said, I've had OK luck with
some of the 'aftermarket' ones (aka fakes)
 
Also look at the DAC board in the Alpha 8 at R69. It should be 2k2
(2200 ohms) if it is still the original 10k resistor change it, and
maybe Q6 (BC847B) at the same time. This was a factory change because
Q6 would get too hot and fail, killing one of the clocks and causing the
laser sled to go flying to the outside. It could trash the gear rack in
the optical pickup.
 
Regards,
Tim Schwartz
Bristol Electronics
Tim Schwartz <tim@bristolnj.com>: Aug 12 02:11PM -0400

On 8/11/2015 3:51 PM, Nick wrote:
> assemblies? Is there an easy way to tell a fake from an original?
 
> Any ideas?
 
> Nick
 
Nick,
 
Genuine Sony KSS-240A pick ups have 3 pots on the board, and the
optical chip is 14 or 16 pins (I can't remember), where as most of the
'aftermarket' ones have 8 pin IC's. That said, I've had OK luck with
some of the 'aftermarket' ones (aka fakes)
 
Also look at the DAC board in the Alpha 8 at R69. It should be 2k2
(2200 ohms) if it is still the original 10k resistor change it, and
maybe Q6 (BC847B) at the same time. This was a factory change because
Q6 would get too hot and fail, killing one of the clocks and causing the
laser sled to go flying to the outside. It could trash the gear rack in
the optical pickup.
 
Regards,
Tim Schwartz
Bristol Electronics
Nick <someone@invalid.inet>: Aug 12 07:20PM

On Wed, 12 Aug 2015 14:11:39 -0400, Tim Schwartz wrote:
 
> 'aftermarket' ones have 8 pin IC's. That said, I've had OK luck with
> some of the 'aftermarket' ones (aka fakes)
 
> Also look at the DAC board in the Alpha 8 at R69. It should be
2k2
> the optical pickup.
 
> Regards,
> Tim Schwartz Bristol Electronics
 
Hi Tim,
 
Thanks for the heads up on that, something to check when I next have the
covers off!
 
Regards
 
Nick
Nick <someone@invalid.inet>: Aug 12 07:25PM

On Wed, 12 Aug 2015 04:00:06 -0700, dansabrservices wrote:
 
> and I don't know the shipping cost. but either or both are available.
 
> Let me know if you are interested.
 
> Dan
 
Hi Dan,
 
Thanks for the offer, I've PM'ed you
 
Cheers
 
Nick
"Gareth Magennis" <sound.service@btconnect.com>: Aug 12 09:07PM +0100

"Arfa Daily" wrote in message news:oFwyx.145392$bt.126359@fx32.am4...
 
 
 
"Nick" <someone@invalid.inet> wrote in message
news:mqdjnv$g6v$1@dont-email.me...
> assemblies? Is there an easy way to tell a fake from an original?
 
> Any ideas?
 
> Nick
 
I'm a bit confused. You start off talking about a '240, and then continue
with the story of having tried two variants of a '210, before returning to
discussing the '240 again at the end. 210's and 240's are quite different
animals ...
 
As to replacing a KSS240A, I have to tell you that I have had pretty much
zero success with replacements for the last 5 years or so, and these days
don't even bother wasting my money getting one in for a job. As to the
places offering "Genuine" or "Original" Sony pickups, I haven't found one
yet that is. In fact, a while back, I had a long argument with an eBay
supplier who advertised an original Sony KSS240 and even had the photo on
the listing of the genuine article, with the Sony logo on the lens surround.
Because of this, and the experience I'd previously had, I chose this
supplier for the exact reason that they *were* offering a genuine
replacement. When it arrived, it was nothing of the sort. Just for sport, I
tried it in the player, and as expected, it behaved worse than the one it
was replacing.
 
I took it up with the supplier and eventually, after a lot of to-ing and
fro-ing got a refund, and got him to change the listing.
 
240's have, in my experience, always been a very fussy laser anyway, but
never more so than with the clones that you now get. In fact, the whole
laser replacement situation has taken a real nose-dive in regard to KSS
series ones over the last couple of years, and for the most part, I don't
even bother replacing 213s any more. Some work ok, some not so well, so not
worth the risk. Interestingly though, I have had no problems with the
replacement Sanyo ones (SFP101N both varieties, and usually supplied as a
complete deck) and Philips VAM 12 / CDM12 varieties.
 
As to telling 'fakes', the originals always had the Sony logo on the lens
surround, always had a small sticker indicating the laser diode current that
had been set to give the specified output, and always had the pot - or pots
in the case of a '240 - sealed with either white or yellow paint.
 
Not very good news for getting your Arcam working, I'm afraid, but just my
experience changing lasers professionally for many years. I'm sure that
there are a few others on here that can add to what I've said with their own
experiences.
 
Arfa
 
 
 
 
 
 
 
I have attempted to repair many CDJ units that use this or similar mechs, by
buying cheap clones off Ebay.
Have to say that the success rate is well below 25%. The product is crap.
 
I don't do that any more.
 
 
 
Gareth.
"Mark Zacharias" <mark_zacharias@labolgcbs.net>: Aug 12 09:20PM -0500

"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:oFwyx.145392$bt.126359@fx32.am4...
> there are a few others on here that can add to what I've said with their
> own experiences.
 
> Arfa
 
 
Most of the problems with the 240's I have seen ended up being the 15-pin
flex cable associated with it. They bend, flex and fatigue up near the
pickup end.
 
Problems are usually intermittent in nature.
 
Mark Z.
Tim Schwartz <tim@bristolnj.com>: Aug 13 07:59AM -0400

Arfa,
 
I'll have to disagree on one point. I've gotten many (most) KSS-240A
lasers without the SONY on the lens cover, including ones purchased
directly from Sony over the past 15 years. I've found the size of the
optical IC on the bottom the best indicator.
 
Regards,
Tim
Bristol Electronics
 
 
On 8/11/2015 8:44 PM, Arfa Daily wrote:
Phil Hobbs <hobbs@electrooptical.net>: Aug 12 04:56PM -0400

> course all the filters were off, but I do want to try those filters.
 
> I started to get close to the null frequency with the external
> generator. I saw how the response dropped.
 
THD is a ratio of RMS voltages, so 1.5V vs 3V is 50% THD, not 25%.
 
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
JW <none@dev.null>: Aug 13 06:00AM -0400

On Wed, 12 Aug 2015 01:01:08 -0700 (PDT) jurb6006@gmail.com wrote in
 
>Update :
 
>https://dl.dropboxusercontent.com/u/29948706/33901.jpg
 
404.
Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au>: Aug 13 07:00AM +1000

On 12/08/2015 5:09 PM, Phil Allison wrote:
> - as indicated by a few pics found on the net.
 
> But what is the number ?
 
> Reckon it likely starts with "TDA..... "
 
**I replaced dozens of those suckers back in the 1970s and 1980s.
Extremely unreliable chips. As others have stated, it is an AN7000. WES
don't stock them (of course). I have one in my IC drawer, but it has
been pulled. I have no idea if it works. If you want to take a chance,
it yours for the cost of postage. A better idea might be to call Peter
Lengel at PJL Electronics. There is a chance he has some stashed away
for a rainy day.
 
--
Trevor Wilson
www.rageaudio.com.au
 
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dansabrservices@yahoo.com: Aug 12 05:52PM -0700

I will check, but I may still have one hanging around. I'll report back.
 
Dan
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