Digest for sci.electronics.repair@googlegroups.com - 13 updates in 6 topics

Bob F <bobnospam@gmail.com>: Jul 05 07:05AM -0700

Has anyone here tried to locate device files to re-program JP1
compatible remote controls for audio/video equipment recently. It seems
like the files themselves have disappeared, or I am really missing
something.
 
For instance:
http://www.hifi-remote.com/forums/dload.php?action=file&file_id=3774
 
I cannot find anything on this page that will actually download the
file, or anywhere else to find it. Does anyone have any suggestions?
 
It does seem like the moderator of the JP1 site has lost interest in
remote control re-programming, so this data may be getting lost.
Geo <nhhu-o3hu@dea.spamcon.org>: Jul 05 04:43PM +0100

>http://www.hifi-remote.com/forums/dload.php?action=file&file_id=3774
 
>I cannot find anything on this page that will actually download the
>file, or anywhere else to find it. Does anyone have any suggestions?
 
 
You have to be signed-in for the download button to appear between the
File frame and the Author frame.
mhooker32@gmail.com: Jul 04 05:44PM -0700

ive got a tovis mtg-1901cn cga color monitor. in use, or with a test pattern, the image starts out perfectly at the top. as you move down toward the middle , it gradually starts to compress the image, with more compression the closed you get to center. and when it gets to mid screen, its a full vertical collapse. bright while line across the center, with no image whatsoever in the lower 50% of the screen. also sold as a vision pro .
 
battery voltage is good at 123, 12v and 24 v are good. 123 volts at the flyback.
the vertical output ic is a LA7833. pin 6 has good 24 volt supply, and pin 2 ( output) is a nice 24 v square wave. i recapped the monitor, and the image is exactly the same. now im stuck.
 
thanks
John-Del <ohger1s@gmail.com>: Jul 04 07:35PM -0700


> battery voltage is good at 123, 12v and 24 v are good. 123 volts at the flyback.
> the vertical output ic is a LA7833. pin 6 has good 24 volt supply, and pin 2 ( output) is a nice 24 v square wave. i recapped the monitor, and the image is exactly the same. now im stuck.
 
> thanks
 
 
 
Sounds like a shorted turn in the deflection yoke, but not sure what you mean by a square wave on the output.
John Robertson <spam@flippers.com>: Jul 04 11:11PM -0700


> battery voltage is good at 123, 12v and 24 v are good. 123 volts at the flyback.
> the vertical output ic is a LA7833. pin 6 has good 24 volt supply, and pin 2 ( output) is a nice 24 v square wave. i recapped the monitor, and the image is exactly the same. now im stuck.
 
> thanks
 
Your vertical circuit is missing the bottom deflection half of the
vertical circuit. If the vertical driver is an IC, replace it, if it is
a pair of transistors then I would suspect the transistor pulling to
ground (typically the lower of the two on schematics) is the one at fault.
 
The vertical drive is just a very slow audio amp, apply audio amp
service methods.
 
John :-#)#
 
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
stratus46@yahoo.com: Jul 05 12:35AM -0700

And if it has a large value (1000-4700uF) cap inside the feedback loop that is failing, that can cause severe linearity issues.
 

John Robertson <spam@flippers.com>: Jul 05 12:39AM -0700

> And if it has a large value (1000-4700uF) cap inside the feedback loop that is failing, that can cause severe linearity issues.
 
> G²
 
Granted, however the OP did say he recapped the monitor and I didn't
want to doubt his statement.
 
John ;-#)#
 
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
mhooker32@gmail.com: Jul 05 06:34AM -0700

On Wednesday, July 5, 2017 at 3:39:44 AM UTC-4, John Robertson wrote:
> (604)872-5757 (Pinballs, Jukes, Video Games)
> www.flippers.com
> "Old pinballers never die, they just flip out."
 
its an IC, an LA7833( nte1773) . i'll change it out and see what happens. i did change out every cap, and it was exactly the same. no better, no worse.
 
thanks much
"pfjw@aol.com" <pfjw@aol.com>: Jul 05 05:35AM -0700

Liquids "Evaporate".
Solids "Sublimate" .
 
You need to understand the process better before you complain. If the seal on that jar is less than 100% the beans will continue to disappear. Were it to be 100%, they would deposit themselves as an even layer inside the glass, but gradually and over a great deal of time.
 
Peter Wieck
Melrose Park, PA
"pfjw@aol.com" <pfjw@aol.com>: Jul 05 05:38AM -0700

On Monday, July 3, 2017 at 12:33:27 PM UTC-4, Foxs Mercantile wrote:
> On 7/3/2017 9:27 AM, jurb6006@gmail.com wrote:
> > But being a Jew I assume there is a madness to your method.
 
> The fuck is your problem?
 
Add "Racist" to the list.
 
Peter Wieck
Melrose Park, PA
"Ian Field" <gangprobing.alien1@virginmedia.com>: Jul 02 08:41PM +0100

"Phil Allison" <pallison49@gmail.com> wrote in message
news:1278b8c5-45ee-4442-ada9-d7ebfea2d8af@googlegroups.com...
 
> http://sound.whsites.net/counterfeit.htm
 
> For a long time now, it has not been safe to buy power BJTs from ANY small
> supplier or on line dealer - cos their stock consists MOSTLY of fakes.
 
Big trusted suppliers get stung too.
 
There are very few dodgy little pharmaceutical distributors and the big boys
get hit just as hard. If they can't keep it clean - component suppliers
never will.
jeff.panasuk@cfl.rr.com: Jul 04 01:44PM -0700

> Back in February or March of 2010 the TV began changing from any channel to channel 2 intermittently. Sometimes very frequent. Other times more intermittent but it would not go more than a few hours without the problem popping up. Replaced IC0102 (MN14834HH) Main IC for the Channel Selection Ckt but no help. Remote control IR circuit not the problem as I disabled it. Over time have replaced some bad unrelated hw (burnt resistor, Caps). Have schematics and service manual but can't isolate the problem. Nice picture and everything else works fine. Unit in storage but every 4 months or so, when I see it and think about it, I fire it up. Hate to trash this old tv. Kind of part of the family now. Has anyone ever heard of this before?
 
No STD, IRC or HRC position switch or other type of such options. Just the single 3-position switch: CATV1, CATV2 or Normal. TV has been running for more than 24 straight hours in the "Normal" switch position mode and has not changed to channel 2.
 
Moving 3-way switch to position:
 
CATV1 TV switched to channel 2 in a few seconds
CATV2 Waited a few minutes but it did not change this time
Normal Steady
 
When switch is moved to one of the three positions the tv defaults to CH2/Vol=21. I cleaned the switch and all is stable while I type these notes. Will monitor and report out.
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Jul 04 01:21PM -0400

On 07/03/2017 05:57 AM, frank wrote:
> Can someone explain what is happening?
> Thanks
 
> Frank IZ8DWF
 
Maybe Barkhausen oscillation (aka the Barkhausen-Kurtz effect). This
used to show up in old-fashioned incandescent light bulbs that were
evacuated instead of argon-filled.
 
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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