Digest for sci.electronics.repair@googlegroups.com - 21 updates in 6 topics

"Miguel Giménez" <me@privacy.net>: May 31 02:29PM +0200

Hi
 
In the last years I have changed twice the laser unit of my Aiwa CD
reader and once the unit of my mom's Sony reader. The three were
original spare parts, and the three died months after.
 
Why this happen? Do I need to adjust laser current after change? Are
they basically unreliable?
 
TIA
 
--
Regards
Miguel Giménez
"pfjw@aol.com" <pfjw@aol.com>: May 31 05:55AM -0700

On Wednesday, May 31, 2017 at 8:30:01 AM UTC-4, Miguel Giménez wrote:
 
> --
> Regards
> Miguel Giménez
 
Never had or observed this problem per-se. Many times I have seen the output level of the laser poorly adjusted, poorly focused or not precisely aligned, especially if resulting from a home repair. Admittedly a small sample, perhaps about 20 players in all.
 
Peter Wieck
Melrose Park, PA
"Miguel Giménez" <me@privacy.net>: May 31 06:34PM +0200


> Never had or observed this problem per-se. Many times I have seen the output level of the laser poorly adjusted, poorly focused or not precisely aligned, especially if resulting from a home repair. Admittedly a small sample, perhaps about 20 players in all.
 
> Peter Wieck
> Melrose Park, PA
 
The replacements worked OK for some months, then failed abruptly. The
symptom was always: insert disk -> some seconds trying to read disk ->
disk ejection. May be a focus problem unrelated to laser?
 
Also, there were neither smokers nor floating dust near the devices.
 
--
Regards
Miguel Giménez
"None" <none@nospam.org>: May 31 07:31AM -0400

< thekma @ dumbfuck.org > wrote in message
news:3813cea3-6910-4a51-bc36-f9af3e9b5cf6@googlegroups.com...
> middle-aged college-educated
> white male is a liability, it
> seems. Go figure!
 
LOL! "College educated"! When your resume says that it took you seven
years trying to get through a two-year community college, employers
may not be impressed. They can (and will) do a google search, and find
that you've bragged that the only reason you "graduated" was because
the faculty was sick of seeing you failing the same classes year after
year, and they just wanted to get rid of you. Can you blame them?
Nobody wants to see that moronic blank stare, indicating a fog of
non-comprehension. If you've found a job at the used crap store, where
they're willing to hire a retarded dumb fuck like you, maybe you
should keep it instead of pretending that you can handle a real job.
 
Being a fucking moron is a liability. Being unable to add two plus two
is a liability. HDKAD. CKWAFA!
"pfjw@aol.com" <pfjw@aol.com>: May 31 05:51AM -0700

On Wednesday, May 31, 2017 at 7:32:00 AM UTC-4, None wrote:
 
Hi, "Barry"?
 
Once upon a time, you gave reasonable advice. Now it seems you are starting to eat what Phil eats, but without the same level of knowledge.
Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au>: May 31 06:54AM +1000

On 30/05/2017 9:13 PM, Phil Allison wrote:
 
 
> In terms of tech specs, sound quality, features and ease of use - it
> is still one of the best CD players ever made.
 
**Sound quality? Nope. The CDP701 (released close to the same time as
the 101) was far better. I recall listening to both at a Sony demo,
through their ES series Sony electronics and those very good flat
diaphragm Sony speakers. The 701 completely outclassed the 101. One of
my clients had both machines and we listened extensively to them
(compared them with 2nd generation master tapes of Hot August Night on
his Studer) and the 701 was a far better sounding machine. Even the Sony
demo guy, who claimed that there would be no sonic difference, was
surprised. That said, a decent multibit machine (like the early Sony and
Philips machines) will sound better than those horrible single bit ones
released in the late 1980s.
 
 
--
Trevor Wilson
www.rageaudio.com.au
thekmanrocks@gmail.com: May 30 02:21PM -0700

Trevor Wilson wrote: "On 30/05/2017 9:13 PM, Phil Allison wrote:
 
 
> In terms of tech specs, sound quality, features and ease of use - it
> is still one of the best CD players ever made.
 
**Sound quality? Nope. The CDP701 (released close to the same time as
the 101) was far better. I recall listening to both at a Sony demo,
through their ES series Sony electronics and those very good flat
diaphragm Sony speakers. The 701 completely outclassed the 101. One of
my clients had both machines and we listened extensively to them
(compared them with 2nd generation master tapes of Hot August Night on
his Studer) and the 701 was a far better sounding machine. Even the Sony
demo guy, who claimed that there would be no sonic difference, was
surprised. That said, a decent multibit machine (like the early Sony and
Philips machines) will sound better than those horrible single bit ones
released in the late 1980s.
 
 
--
Trevor Wilson "
 
Was the CDP101 vs 701 test
done with the same exact source
(CD) in the same listening environment,
connected to the same system?
 
 
Otherwise such tests are invalid.
Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au>: May 31 07:45AM +1000

On 31/05/2017 6:54 AM, Trevor Wilson wrote:
> surprised. That said, a decent multibit machine (like the early Sony and
> Philips machines) will sound better than those horrible single bit ones
> released in the late 1980s.
 
Was the CDP101 vs 701 test
done with the same exact source
(CD) in the same listening environment,
connected to the same system?
 
 
Otherwise such tests are invalid.
 
**Did you bother reading what I wrote? Go back and read it CAREFULLY.
 
In truth, the only invalid part of the MANY tests I did, comparing the
two machines, was the fact that none were done blind. An oversight I
regret.
 
 
--
Trevor Wilson
www.rageaudio.com.au
Phil Allison <pallison49@gmail.com>: May 30 08:45PM -0700

> (CD) in the same listening environment,
> connected to the same system?
 
> Otherwise such tests are invalid.
 
** TWs listening tests are totally invalid - cos he used the audiophool method.
 
Machine A plays, stop, muck about, have a chat then machine B plays.
 
Absolute bollocks.
 
As a matter of fact, I carried out a blind testing session between my CDP101 and a borrowed CDP701 for a customer. He had a well damped room with Quad ESL63s at the time driven by an expensive Sony amp. It was all nicely set up for best imaging etc.
 
Both CD players were out in the hallway, so he could not see them or me. All I had to do was swap RCA leads and CDs between machines.
 
Try as he might, using his favourite classical tracks, he could not tell the machines apart.
 
Happy that there was no audible difference, he opted to buy the more expensive model.
 
He merely wanted to be *certain* the cheaper model was not actually better.
 
 
 
..... Phil
thekmanrocks@gmail.com: May 31 01:30AM -0700

Phil Allison wrote: "Try as he might, using his favourite classical tracks, he could not tell the machines apart.
 
Happy that there was no audible difference, he opted to buy the more expensive model.
 
He merely wanted to be *certain* the cheaper model was not actually better.
 
..... Phil "
 
I rest my case: the SOURCE(what's on
the medium) matters most!
jurb6006@gmail.com: May 31 01:57AM -0700

Does the 101 have the delay to match the phase of the channels ?
jurb6006@gmail.com: May 31 02:09AM -0700

>"** TWs listening tests are totally invalid - cos he used the audiophool method.
 
Machine A plays, stop, muck about, have a chat then machine B plays.
 
Absolute bollocks. "
 
Actually with stamped CDs it would be valid to just use two copies of the same album. If there is ay doubt switch them but we know that sound quality had very little to do with the audio quality. It is just a matter of how many errors does it have to cover up.
 
They are stamped, you get two of them right next to each other from the shelf and they are likely to be the same batch and have the same errors. And the only errors that will have any real effect on sound quality will be those pertaining to the deemphasis.
 
Two disks and a toggle switch would do just fine. then switch the disks ad see if the more favorable rating follows it ort stays with the player.
 
Kida like splitting a bag of weed when your scalee is broken. "You split I'll pick" or vice versa. Whoever is splittlg is going to get them as close as humanly possible because he knows he gets the smaller one. Or whichever one is perceived as smaller by the picker.
 
Ever hear of scraping ? They use like a gouge to scrape metal plates to within millionths of an inch. There is no reference because these ARE the reference. they are the standard to which the ways of machines must adhere for flatness and straightness.
 
they use three plates, why ? Well, you blue it up and then separate the plates and observe the bluing. This really is an art. You can get two plates pretty flat, but there is ONE way they can be off and you can't tel. That is if one is slightly convex and the other concave. That is the reason for the third plate. It makes that type of error detectable because to match perfectly the third plate would have to be concave or convex and thus would math one of the two other plates but not the other.
 
In other words, all this fiddling switching disks every few minutes is a waste of time. Just switch them and rerun the comparison.
 
Actually I doubt very mny people can hear ant difference between cD players, butin the US would always prefer the one that has a slightly higher output level because it is louder.
 
You want an audio A/B comparison ? Golden Earring - Moontan, on vinyl. Compare the US version to the European version. BIG difference.
Phil Allison <pallison49@gmail.com>: May 31 02:44AM -0700

jurb...@gmail.com wrote:
 
------------------------
 
 
> Actually I doubt very mny people can hear ant difference between
> cD players, butin the US would always prefer the one that has a
> slightly higher output level because it is louder.
 
** CD players are built under license to a standard ( Red Book) which requires the audio output is 2.0V rms for max sine wave level.
 
Makes comparing them pretty easy if you use the same RCA leads and disk.
 
 
.... Phil
Trevor Wilson <trevor@SPAMBLOCKrageaudio.com.au>: May 31 08:27PM +1000

> Does the 101 have the delay to match the phase of the channels ?
 
**Yes. In the feedback of the OP amp after the buffer stage, one OP amp
has a 15k resistor in parallel with a 75pF, whilst the other channel has
16k in parallel with a 75pF cap. A bit of a kludge. As I recall, the
CDP701 employed two, separate DACs. I could be wrong, so I'll see if I
can locate the manual tomorrow.
 
--
Trevor Wilson
www.rageaudio.com.au
thekmanrocks@gmail.com: May 31 03:54AM -0700

Interesting anecdote: I had an Aiwa bookshelf
system set up in the store and playing a Stevie
Wonder CD. A guy came over and started playing
with it, listening to different tracks etc. He said it
sounded great, and he bought it.
 
 
Next day, he came in, saying he had the "same
disc" at home, but that the system did not sound
nearly as good as when he played with it in the
store. Since he said he had the disc, I asked him
to bring his in next time he visited.
 
 
The next week he came in with the CD, and I
compared it to the copy in my inventory: His was
a REMASTER....
thekmanrocks@gmail.com: May 31 04:12AM -0700

Trevor, jurb: R.E. "phase of the channels"
 
 
Is there something I don't know
about CD players, or how they
function? Does the audio arrive
out of phase/polarity at some
point in the chain inside the
player?
"None" <none@nospam.org>: May 31 07:28AM -0400

<t hekma @gmail.com> wrote in message
news:a4021516-0195-49a3-8685-b446a78020ab@googlegroups.com...
> Is there something I don't know about CD players, or how they
> function?
 
Yes. Pretty much everything about audio is something you don't know.
KHF,
gregz <zekor@comcast.net>: May 31 06:37AM

>> sound.
 
> Bass guitar players would only use an 8" speaker for practice,
> and then only under duress.
 
Take a look at Phil Jones bass. Lots of little drivers made by him. He must
use some eq I figure.
 
Greg
tabbypurr@gmail.com: May 30 03:16PM -0700

On Tuesday, 30 May 2017 17:24:01 UTC+1, Jeff Liebermann wrote:
 
> something that requires regular recharging, such as handheld radios,
> and flashlights. I'm doing something wrong with NiMH, but haven't
> figured out what.
 
Discharging too far is their biggest killer. Or to put it another way, mismatched cells. When one flattens the others push current through it & it suffers badly.
 
 
NT
oldschool@tubes.com: May 30 11:41AM -0400

On Mon, 29 May 2017 14:40:08 -0500, Ralph Phillips <ralphp@philent.biz>
wrote:
 
 
>I also use Foxit Reader; but that sucker's bloating up like a beached
>whale in August in Florida ...
 
>RwP
 
IRFANVIEW can view PDF files???????
That's a new one on me.
 
I have IRFANVIEW installed, for viewing images, but I dont use it too
much. I prefer Acdsee. Mostly because IRFANVIEW always forces small
images to fit the screen as a default, and small images look like crap
when they expanded. So I have to repeatedly resize each and every image
to it's ACTUAL size. That gets real tiring. Acdsee shows the images at
their actual size, unless the image is larger than my screen, in which t
fits the image to the screen. I dont have to keep adjusting the viewed
image size, it just views automatically. Because of that, IRFANVIEW is
NOT my default viewer.
 
FOXIT Reader was once a decent PDF viewer. I used it for several years.
A few months ago, I put a larger hard drive in my laptop. Rather than
image my setup from the smaller drive, I decided to just reinstall XP
from scratch. I was traveling to a destination, and someone had given me
a PDF map. I pulled over at a wayside to view it, when I realized that I
did not have a PDF viewer installed.
 
So, I drive to the nearest restaurant that had WIFI, and googled "PDF
Viewer". The first one that popped up was Foxit. I was in a hurry and
did not have time to piss around. I just wanted to view that PDF map.
I installed Foxit reader, and what I saw was so bloated and filled with
complicated crap that I wanted no part of it. (And if I recall, it was
also full of advertising). I did manage to view my map though.
But a few days later, when I was not in a hurry, I again opened that
miserable bloated piece of shit, and looked at it. It took me less than
5 minutes to remove it from my computer, and install PDF-Xchange.
I thought Adobe's reader was bad, until I tried the latest Foxit. (It's
worse). I would not recommend Foxit to anyone.....
jurb6006@gmail.com: May 30 11:25AM -0700

Here's a nice trick if you are still using XP. (also works in Vista)
 
Get into Windows Explorer and set it to show hidden/system files. Now go find the executable for each of your viewers or aything where you have a choice off different programs to open. Right click the executable and hit "Desktop Create Shortcut.
 
Drag those shortcuts into the \sendto directory, which will be under your username in Documents and Settings.
 
Now when you right click a file you can force it to any of the programs at will and not change the file association.
 
I tried it in Win7 and it gave me all kinds of hell with this access denied. Whose PC is this anyway ? I no longer have Win7.
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