Digest for sci.electronics.repair@googlegroups.com - 5 updates in 4 topics

fosekyere@gmail.com: Jul 16 09:14AM -0700

To reset the Amplifier, please turn off the amplifier, press and hold the channel (+) botton and press power botton
"Mark Zacharias" <mark_zacharias@labolgcbs.net>: Jul 16 07:38AM -0500

"Chuck" <chuck@mydeja.net> wrote in message
news:k3ncqatvmhho8db2sos0rd2ditd6qf0l7t@4ax.com...
 
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I've worked on analog receivers almost every day for 33 years. While I
cannot diagnose via usenet, if there IS a history of these blowing the
center channel, I would look very closely at solder connections relating to
the bias transistor. This is the type of thing that might cause such a
history on a given model type.
 
The advice given on the relay is good if the channel volume is merely down
or especially if the volume is intermittent and comes back with an increase
of the volume control setting or as he said with tapping the relay body.
 
Mark Z.
thekmanrocks@gmail.com: Jul 16 06:18AM -0700

Alright, Mark Z, et al:
 
 
I've discovered that I can get center channel - for a while -
by moving the speaker wire around in the center ch
connector on the receiver. Last night I stripped off an
extra long length of wire, so as to bend it over to double
the thickness.
 
 
That worked - last night. This morning I turned it back on,
and got center for about ten minutes before it cut out again.
I fiddled with it some more, and discovered that by having the
speaker wire(16AWG by the way) *barely in* the connecting
terminal, with the locking tab left up, I get center pretty
consistently. If I pushed the positive in all the way - NO
center. If I jiggled it - intermittent center. So we'll
see how long it produces center with the positive barely hanging
in there. Different times of day, the center works, other times,
not.
 
 
My original RX-515, which is still in my cellar, is definitely blown
center, at the component level. No amount of jiggling or
doubling over the copper strands is gonna pass sound through
the center speaker with that thing.
 
 
And the sad part of all this is JVC is OUT of the home audio
business! Here they had a great mid-price surround-sound
receiver for mid-1990s, ample power, connections for TWO
tape loops(great because I have an EQ on one and my
tape deck on another), and a phono input.
 
 
I couldn't give two shits about HDMI inputs, bluetooth, and X.1
digital surround if I can't hook all of my analog gear up to it!!
 
 
So I'm going to buy every remaining RX-515V out
there, at least just for parts interchangeability.
Chris Jones <lugnut808@spam.yahoo.com>: Jul 16 10:40PM +1000

On 16/07/2015 01:57, Jeroni Paul wrote:
> CRTs are better as far as efficiency goes in they generate the
> required light only,
Though I guess at least 2/3 of the electron beam power in a CRT would go
into heating the shadow mask or aperture grille. (Unless it is a black
and white set.)
 
> unlike LCD where the backlight is always full on
> no matter the screen contents.
As well as the picture content, I guess in LCD TVs they lose a lot of
light in the polarisers, on top of what is lost in the R,G,B filters.
 
> processing. At the end the energy wasted to run both is similar, just
> look at the rated power consumption, you may be surprised. 28" CRT
> TVs take 100W typ. while similar size LCD are rated 130W typ.
 
You make a good point, some CRT TVs are quite efficient. Also I like the
idea of having a particle accelerator in the living room.
Ken <Ken@invalid.com>: Jul 15 08:39PM -0500

David Farber wrote:
> 5. Is the GPU good?
> 6. How to proceed next?
 
> Thanks for your reply.
 
I dealt with the same model computer over the Christmas holiday. It is
hard for me to imagine the video chip being a problem if the external
video works. That being said, you are correct about MANY such computers
having a video problem. I did the blow torch/ shield from the heat
method, and the computer worked for about a day. Long enough to take
all the data off the hard drive for the owner.
 
To tell you the truth, I would not put too much labor into this model
computer. Especially with it's history. You could be making a career
choice.
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