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

Chuck <ch@dejanews.net>: Apr 02 09:25PM -0500

The radio was working before I moved. I unpacked it and plugged it in.
There was a half of a display but no sound. After resetting it a few
times, I had a display and sound for a few seconds. Let it sit over
night and it was totally dead. I was going to buy a new radio since I
had to go to an early morning appointment tomorrow. I moved to a rural
area and all the radios that were available were crap audiowise. Since
that was the case, I replaced the backup AAA batteries and the radio
works fine. Great design. If the backup batteries fail in a certain
way, the radio dies.
 
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Terry Schwartz <tschw10117@aol.com>: Apr 03 08:30AM -0700

On Monday, April 2, 2018 at 9:25:15 PM UTC-5, Chuck wrote:
 
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Maybe the thing is running on those backup batteries, at least in part. It'll be interesting to see how long it behaves normally on the new set of batteries.
Adrian Caspersz <email@here.invalid>: Apr 03 02:59PM +0100

You might enjoy this?
 
http://www.angelfire.com/electronic/funwithtubes/index.html
 
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Adrian C
M Philbrook <jamie_ka1lpa@charter.net>: Apr 02 08:16PM -0400

In article <639090a1-3412-4d07-96c0-1cfd964b91d8@googlegroups.com>,
jurb6006@gmail.com says...
 
> Scroll down and get to where it says "processing". Watch that until it says "Get manual" and click there to download. I guess that rigamaroll is to keep the bots out.
 
> Anyway, R 437 feeds Q 423 which appears to be a simple pass regulator. It is in the return for a 560 volt winding that is doubled for negative voltage, which would only be used for the cathode circuit of the CRT. This regulates that.
 
> Disconnect C 424 or 425 and see if the resistor is still stressed. If not look for a short around D 412 through 415. If there is no short try it connected but without the CRT socket on. Look for arcing in the socket. If none, disconnect the filament winding from the power transformer at pins 5 and 4 and see if the resistor is comfortable then. If so, suspect the power transformer for internal leakage to ground via that winding. That is actually among the most likely
suspects.
 
> If all that is good then move on to the circuitry associated with Q 420.
 
> The problem has to be around there somewhere. If the picture you supplied is your only print, get the manual for the 520 as it seems to conform to what you said. It should be close enough. I checked the 522, 510, whatever and none of them are close, there is no R 437 anywhere nearby in any of them.
 
> The voltage at the junction of D 417 and 418 would be telling once you start disconnecting. Right now with the short it will be high. Once the short is gone by disconnecting things it will be low because due to the lack of output voltage the feedback will force Q 423 into full conduction. That is when you found it.
 
why can't I go to those websites any more without down loading their
down loader first?
 
I don't want toolbars installed, TSR's running, adds popping up on my
PC all over the place...
 
What a shame the NET has turned into a field of garbage.
jurb6006@gmail.com: Apr 02 06:16PM -0700

Perhaps you missed this part :
 
>"Scroll down and get to where it says "processing". Watch that until it says "Get manual" and click there to download. I guess that rigamaroll is to keep the bots out. "
 
Don't click on anything else. It does take a bit of time, but the text DOES change from "processing" to "Get manual". Those letters are the link to actual manual.
 
That bit of test is underneath the picture on the left. Small print of course. At least they don't use that %$&*# captha shit.
 
>"I don't want toolbars installed, TSR's running, adds popping up on my PC all over the place... "
 
Me too. In fact my older browser that I LIKE it vulnerable to a button installed by eBay. It is not all that easy to disable. Pricks. So when someone puts up a link to an eBay page I right click and save location and go to Chrome, which I can't strand, and do a "Paste And Go". I need Chrome for certain sites. Then I got IE for downloading videos and music because FF gets it in some weird format, Chrome doesn't get them at all but IE gets them in native MP4 so I don't have to convert them. And they're smaller.
 
I prefer FF 18, some people like even older versions. I got 15 on my old XP box but that is currently not on the net, but it will be. However I will not use it for casual surfing because of the obvious reasons. I need it mainly to be on the house network because it has extensive media and other files. The net down there would be limited to youtube, places to get datasheets and manuals. Qnd not even that much youtube. The IE got damaged by a virus years ago, and the highest you can get is 8 for XP so I just ain't too worried about it.
 
At any rate, the link it there but it is just a bit hidden. It doesn't even look like a link but you can tell by the cursor.
"pfjw@aol.com" <peterwieck33@gmail.com>: Apr 02 09:57AM -0700

On Monday, April 2, 2018 at 12:43:09 PM UTC-4, J.B. Wood wrote:
> time and comment. Sincerely,
 
> --
> J. B. Wood e-mail: arl_123234@hotmail.com
 
Maxell makes a good battery and have been around for many year. At the same time, we bulk-purchase our button cells.
 
https://www.bestbyte.net/energizer-cr2016-lithium-coin-cell-battery-bulk-tray-packaging.html
 
 
Peter Wieck
Melrose Park, PA
tabbypurr@gmail.com: Apr 02 01:09PM -0700

On Monday, 2 April 2018 17:43:09 UTC+1, J.B. Wood wrote:
 
> (Eveready 377) Silver Oxide and CR2016 Lithium cells are standard usage
> in electronic watches, and I'd like to focus on these. Thanks for your
> time and comment. Sincerely,
 
I don't have data on silver & lithium, but when it comes to alkalines most brands are not far apart in capacity. Silly advertising budgets don't increase the capacity it turns out.
 
 
NT
Mike_Duffy <mqduffy001@bell.net>: Apr 02 07:34PM -0400


> when it comes to alkalines most brands are not far apart in capacity.
 
True. Energizer (tm) batteries are supposed to have enhanced anti-leak
protection. This appears to be accurate. I recently replaced some that were
in a cheapo digital camera I keep in my car for accidents. They had been
full, but had not leaked fluid at all even though completely dead after a
few years of current microdrainage. Like most devices, the 'off' setting
(move a slide to cover the lens) apparently just puts it into a low-power
standby mode. They had endured a few winters (min -30C) and summers (max
+50C? interior) as well.
 
Despite that, I plan to leave them loose in the case in the future.
Tekkie® <Tekkie@comcast.net>: Apr 02 05:14PM -0400

Tim posted for all of us...
 
 
> set the resin. And thee is also the self-adhering/fusing tape that
> basically melts together when it is wrapped under tension. Take your
> pick.
 
This reply was regarding the old towels used to clean vehicle windshields
NOT USB cables.
 
--
Tekkie
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