Digest for sci.electronics.repair@googlegroups.com - 12 updates in 10 topics

N_Cook <diverse@tcp.co.uk>: Jun 22 02:47PM +0100

With just the main PA rail AC supply connected, no load,sometimes at
switch on will draw sustained >2 amp , so quickly switched off.
At 50% mains , sustained 1 amp draw until switched off.
Mains Tx ok on its own.
DVM-D cold testing of PA devices and bridge rect etc check out reasonable.
What to look for cold initially?
I may try hot test again with the speaker output pcb disconnected as
speaker protector thtristors on there.
Initially one output channel failed soon after power up, which could be
sp prot failure presumably, mains fuse did not blow though but that
>=500W would be going somewhere it shouldn't.
Perhaps another 50% mains half second try out and see if a thyristor is hot.
Micky <NONONObobbyburns1111@gmail.com>: Jun 17 09:07AM -0400

On Tue, 07 Jun 2016 20:10:00 -0400, Micky
 
>Great. I'll replace it. Easy enough.
 
>16volts 1000uF, I suppose the bag of caps in the basement for the last
>30 years are too old to use???? If so I'll buy a new one.
 
I had two never-used caps of the right size in the basement and I was
too impatient to try to test them, so I just used one to replace the
original.
 
It didn't work.
 
Finally someone suggested what I already knew and forgot, to test the
speaker with a battery. It clicked the first time the battery was
touched to the plug but not again. Then clicked again when the plug
tip and ring were shorted to each other. So the speaker was good and
probably always good. I should have done this first.
 
And that means the left channel of the amplifier probably has a
problem.
 
 
>That still leaves the possibility that something about the first-pair
>speaker that works broke and it didn't pass the sound on to the other
>one. They use different channels of the same amplifier.
 
That appears to be the case.
 
 
>But it was hard** to open the speaker, so I'll do the cap first.
 
The grill along with its grill cloth was glued in place in the first
speaker, and I had to break two of the four plastic prongs to take it
off, which was needed to find the screws and take off the back. I
suspect the other one is glued too and don't want to break it open,
especially since it's going to a friend who only, for some reason,
wants one speaker. At least for now. So what good would it do to
fix it. I'll keep the second speaker, which has an RCA plug on it.
 
Thanks for the help.
 
 
JW <none@dev.null>: Jun 17 05:57AM -0400

On Thu, 16 Jun 2016 16:41:50 -0700 (PDT) jurb6006@gmail.com wrote in
 
>OK first have a laugh. My PC at work has a touch screen, not that I ever use it. Normally it shuts down after do many minutes, but today there was a fly there and when it landed on the screen it turned it back on.
 
>But my question is about Acrobat reader.
 
Why bother? Try http://www.tracker-software.com/product/pdf-xchange-viewer
Jerry Peters <jerry@example.invalid>: Jun 17 08:26PM


> I have been having trouble finding old versions of programs these days. For example I would like Firefox 23. Oh, and let's not even go into what I can't find in the new version of that, which is what I run at work.
 
Try Palemoon, it's a fork of FF 24, IIRC. I gave up on FF a number of
months ago, converting all my computers to Palemoon. I got fed up with
the constant updates that made FF *less* usable and configurable. The
final straw was the major interface changes and the need for at least
5 extensions and a multitude of customizations to reverse.
"Gareth Magennis" <soundserviceleeds@outlook.com>: Jun 16 09:55PM +0100

I'm well glad I'm in a position to refuse to repair this kind of bollocks.
 
 
Gareth.
 
 
 
 
 
 
 
 
"N_Cook" wrote in message news:njtpl8$9cm$1@dont-email.me...
 
On 16/06/2016 00:07, Gareth Magennis wrote:
 
> You might want to reconsider that. Isn't that restricting the amps
> headroom?
 
> Gareth.
 
yes, going the wrong way, so removed.
On the air-movement lack of design, instead of drilling small screws
through the h/s
for the pcb mounting screws, they deep milled off the corners so making
it even less likely the air will pass through the restriction of the h/s
vanes
"~misfit~" <shaun.at.pukekohe@gmail.com>: Jun 17 04:03PM +1200

Once upon a time on usenet Mr.E wrote:
>> learn something every day.
 
> The FRU 13N2590 is a desktop FRU. The thinkpad group was "fishing"
> for a knowledgeable repair person for Lenovo.
 
Ahh, ok. I guess if I'd looked at the fan size I would have maybe noticed.
However the "12 Volt" thing jumped out at me first.
 
w/r/t desktop fans I just match physical size, number (and function) of
wires and rated current draw or volume of air moved. Sometimes only a few of
the preceeding. ;)
--
Shaun.
 
"Humans will have advanced a long, long way when religious belief has a cozy
little classification in the DSM*."
David Melville (in r.a.s.f1)
(*Diagnostic and Statistical Manual of Mental Disorders)
Michael Black <et472@ncf.ca>: Jun 15 11:44PM -0400

isw <isw@witzend.com>: Jun 16 08:24PM -0700

In article <4aa2c184-028c-4103-ab9b-1b2d88b411c9@googlegroups.com>,
> want to get out of the house.
 
> Personally I would rather work for a place that wants to make money. In fact
> HAS to make money because that makes me more valuable.
 
Why don't you just write up the purchase order and take it to be
approved, instead of carping about it?
 
Isaac
kaeckman <f6ceedb9c75b52f7fcc0a55cf0cfbf5d_1041@example.com>: Jun 15 10:37PM

i have a Robbins & Myers motor 3/4 hp 115/230 volts 3450 rpm 60 cycle wired
for 230 and i need it wired for 115 volts how do i do that?
 
 
 
--
curls <borskyc@yahoo.com>: Jun 21 09:42PM -0700

> >> <https://en.wikipedia.org/wiki/Azeotrope>
> >> Note that 70% alcohol is what you want for a disinfectant because some
> >> water is needed to kill of hydrophylic bugs.
 
Well, good to know. Also that 91% is good enough for this job. Stuff I wouldn't even think to think about, turns out to be very relevant.
 
I tried to find and clean the mirror. No success getting in far enough.
 
Now it often reads when first loaded. But has trouble after it's loaded, and stopped, on finding it to read again. Can't imagine what causes that?
Micky <NONONObobbyburns1111@gmail.com>: Jun 22 12:19AM -0400


>Clean-up is still a horrible mess, but yes, I do see your point sir.
>I would also recommend using your favorite neighbor's house for these
>charging forays.
 
Yes, that's why I like to do repairs for my friends. I find out what
can go wrong before I do the same thing for myself.
 
axolotyl <axolotyl@axolotyl.com>: Jun 22 08:42AM +0800

On 15-Jun-16 5:35 AM, Tom Biasi wrote:
>>> More than standard broadcast range is desirable.
 
>> Radiation hardened?
 
> What does it matter. No transmitters will be on.
 
 
You got a laugh out of me.
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