Digest for sci.electronics.repair@googlegroups.com - 10 updates in 5 topics

"Darkmind" <darkmind64@hotmail.com>: Nov 24 10:05AM -0600

Hi all,
I'm looking for schematics (at least PSU) and/or service manual to repair a METRIX OX2000 oscilloscope.
Thanks to anyone that can post it or give me a way to obtain it.
 
Best regards.
Darkmind
 
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cowridermi@hotmail.com: Nov 24 05:19AM -0800

Thanks for all your help. I will order the cap and see how it goes when it comes in. It's been a real pain to have to put the stations in each time.
 
THANKS
jurb6006@gmail.com: Nov 23 11:46PM -0800

>"The problem is with clogged ac condensate drain."
 
Sounds like a not so good install. Could also be an air leak betwen the filter and the intake.
 
And, these things are not easy to really clean, the one here I would have to take the whole plenum apart. It did leak a couple years ago but seems to be alright now.
 
Of course make sure you have a good pitch on that drainpipe as well.
carey_1959@yahoo.com: Nov 23 04:16PM -0800


> stereo?
 
> both channels go out?
 
> m
 
 
Yes, but it started working again (!), for the moment anyway. I had started exercising a few secondary switches (tone defeat/subsonic filter/high cut)
and it would make a 'pop' when selecting 'tone defeat' at first, then it
started working. It sounds good right now, except, if I may quibble, somewhat
sloppy-loose on the lower end. So my next question: is this something that
might be improved by replacing capacitors, which I've not
done before?
For now I'm leaving it alone, but am encouraged by the thing
coming to life, even if only briefly (fingers crossed).
Fred Smith <fred@thejanitor.corp>: Nov 24 01:06AM

> done before?
> For now I'm leaving it alone, but am encouraged by the thing
> coming to life, even if only briefly (fingers crossed).
 
Ahhh, replacing capacitors, the new snake oil. Just like valves in
the olden days. I think people do this because they look obvious.
 
No, replacing them is very unlikely to fix your problem. Which
sounds a lot like the switches are getting old, oxidized, and
could probably use a squirt of contact cleaner and some
exercising.
carey_1959@yahoo.com: Nov 23 05:16PM -0800

On Thursday, November 23, 2017 at 5:06:55 PM UTC-8, Fred Smith wrote:
> sounds a lot like the switches are getting old, oxidized, and
> could probably use a squirt of contact cleaner and some
> exercising.
 
 
Thanks for the reply. I think I was unclear in my last post, and what I meant
to ask is assuming the receiver continues to work, with the help of doing
what you suggest, would replacement of capacitors be a possible cure for the
loose low-end sound, or is this wrong thinking?
"pfjw@aol.com" <pfjw@aol.com>: Nov 23 05:47PM -0800

On Thursday, November 23, 2017 at 8:16:57 PM UTC-5, carey...@yahoo.com
> to ask is assuming the receiver continues to work, with the help of doing
> what you suggest, would replacement of capacitors be a possible cure for the
> loose low-end sound, or is this wrong thinking?
 
Without putting too fine a point on it, and given that you have a Pacific-Rim HK device vs a Long Island, NY device, and given its vintage, I will risk heresy. It is *unlikely* but not improbable that your capacitors have reached the at-risk age. I would put those odds at 30/70, with the 70 that they are OK. When HK went Pacific-Rim, they went to the lowest-cost-supplier model that was absolutely *not* what they were when in LI. But it remains sufficiently recent that the caps are likely good.
 
But, clean and exercise your switches. Clean your relays if you are of a mind to - I have done this. A PITA, but not one that is such that you would dump the unit in the trash rather than taking it on.
 
I continue to be glad that I support no Pacific Rim equipment other than Sony & Yamaha CD changers, of which I support 5 + one (1) Yamaha and one (1) Revox. I have obtained all of these Sony devices from thrift stores - and paid the highest ($25) for two 200-disc changers, complete with remotes. The Yamaha was purchased in the Souks of Al Khobar many moons ago. And been on the front lines since.
 
Glad that it seems to be clearing itself out. That is often a pleasant result with an item that has been sitting on a shelf for a long while. It acts out until it re-learns how to behave.
 
Peter Wieck
Melrose Park, PA
carey_1959@yahoo.com: Nov 23 07:16PM -0800


> Glad that it seems to be clearing itself out. That is often a pleasant result with an item that has been sitting on a shelf for a long while. It acts out until it re-learns how to behave.
 
> Peter Wieck
> Melrose Park, PA
 
 
Well I'm glad to hear that the capacitors probably aren't an issue. I'll keep
working the switches and hope for the best. I like the receiver, and that it
has a stereo blend control, which is very nice for use with headphones.
Phil Allison <pallison49@gmail.com>: Nov 23 11:16PM -0800

carey...@yahoo.com wrote:
 
-------------------------------
 
 
> It sounds good right now, except, if I may quibble, somewhat
> sloppy-loose on the lower end.
 
** Your amp has diarrhoea ?
 
 
 
 
..... Phil
bruce2bowser@gmail.com: Nov 23 12:11PM -0800

olds...@tubes.com> wrote in message
news:o6qsvctf88lq58bq4to4qrc56s59jjl0i1@4ax.com...
> search for "Abandonware". I found one site (maybe more) that has the old
> versions of Norton Utilities, Win98, and all the Dos versions you will
> ever need. All free to download.
 
I might check that site out, though I assume most of that pprogramming would be recognized instantly and be upgraded/reworked as allowed and then put into use with today's modern programming.
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