Digest for sci.electronics.repair@googlegroups.com - 1 update in 1 topic

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Erik Baas <d7c889cce51b0b581b3b066c0e58f364@example.com>: Nov 25 06:45PM

Try eserviceinfo DOT com
 
--
For full context, visit https://www.electrondepot.com/repair/power-supply-schema-sony-slv-se610-710-52477-.htm
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Digest for sci.electronics.repair@googlegroups.com - 2 updates in 2 topics

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danny burstein <dannyb@panix.com>: Nov 24 06:01AM

whit3rd <whit3rd@gmail.com>: Nov 23 09:56AM -0800


> The photo here is one of a pair of Eppindorf 5415D centrifuges.
> http://easthope.ca/Eppindorf5415D.jpg
 
> This morning both machines failed to operate. .... Fuses are OK.
 
Open 'em up and look for more fuses. There are modular
parts in many appliances, and the main fuse might be slower
or less sensitive than the fuse in one of the modules.
I've seen three fuses in series, and 'fusible resistors', reset-button
circuit breakers... safety consideration can get excessive.
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Digest for sci.electronics.repair@googlegroups.com - 4 updates in 1 topic

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peter@easthope.ca: Nov 22 03:05PM -0700

Hi,
 
The photo here is one of a pair of Eppindorf 5415D centrifuges.
http://easthope.ca/Eppindorf5415D.jpg
 
This morning both machines failed to operate. No response when the
main power switch is flipped on. Empty display. No power indicator
light. Fuses are OK.
 
The machines are in separate rooms. There is power at the receptacles
they connect to. No other equipment is failing.
 
Ideas?
 
Thanks, ... P.
"Peter W." <peterwieck33@gmail.com>: Nov 23 04:33AM -0800

Same age? Close serial numbers?
 
As to power - did you plug in another piece of equipment, or just check with some sort of tester? If the neutral is out, you may have "power", but not usable power.
 
Suggestions in no particular order:
 
a) Find the main panel that feeds those circuits and the individual breaker(s). Cycle them.
b) Move the machines to another known-good receptacle.
c) Check the power cords. If they are not hard-wired, try removing/plugging back in.
d) Check the lid interlock(s). If they are sticking, the machines will not start. In the case of some of the machines here, they will not even light up if the interlock is not either fully open or fully engaged.
e) Replace the fuses anyway. They get tired and may not show as blown, but may still be open.
 
Good Luck!
 
Peter Wieck
Melrose Park, PA
Bob Engelhardt <BobEngelhardt@comcast.net>: Nov 23 09:10AM -0500

>[...]
> The machines are in separate rooms. There is power at the receptacles
> they connect to. No other equipment is failing.
 
"Separate rooms"!! That is truly confounding. Ordinarily, the 2 rooms
situation would imply 2 power circuits (breakers). But with identical,
spontaneous failures of both machines, they are _most likely_ on the
same circuit. So the breaker is tripped, or defective.
legg <legg@nospam.magma.ca>: Nov 23 09:37AM -0500

>they connect to. No other equipment is failing.
 
>Ideas?
 
>Thanks, ... P.
 
If mains is truly not to blame, I suggest that the 'failure' is
not simultaneous - just that you noticed both not working for
the first time.
 
Gremlins killed unit #1. Unit #2 was then used till IT failed.
 
... then you came in . . . .
 
RL
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Digest for sci.electronics.repair@googlegroups.com - 1 update in 1 topic

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"Gopalakrishnamurthy C.R" <gopalakrishnamurthy.c.r@kssem.edu.in>: Nov 18 03:57AM -0800


> ___________________________________________________________________________________________________
 
> contact me to : matt...@gmail.com mattosbw1(at)gmail.com
 
> ___________________________________________________________________________________________________
send me solution manual of Albert Malvino, David J Bates, Electronic Principles, 7th Edition, Mc Graw Hill Education
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Digest for sci.electronics.repair@googlegroups.com - 6 updates in 2 topics

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kgpup <kgpupswitch@gmail.com>: Nov 13 07:05PM

Hi all, when I plug in the aforementioned TV I get no red standby light at
all and the backlight flashes a little longer than a second. Any ideas?
"Peter W." <peterwieck33@gmail.com>: Nov 13 11:45AM -0800

On Monday, November 13, 2023 at 2:05:57 PM UTC-5, kgpup wrote:
> Hi all, when I plug in the aforementioned TV I get no red standby light at
> all and the backlight flashes a little longer than a second. Any ideas?
 
If I were to hazard a guess, that TV got spiked at some point. It may be as simple as a frozen relay in the starting circuit, a fusible link or similar.
Repeat: S.W.A.G. Guess.
 
Peter Wieck
Melrose Park, PA
"ohg...@gmail.com" <ohger1s@gmail.com>: Nov 13 01:34PM -0800

On Monday, November 13, 2023 at 2:05:57 PM UTC-5, kgpup wrote:
> Hi all, when I plug in the aforementioned TV I get no red standby light at
> all and the backlight flashes a little longer than a second. Any ideas?
 
I've stopped taking in all TU series Samsungs because most have bad display screens. Symptoms are from random shutdown and restart (with tell-tale very fine horiz lines in the pic as viewed up close) to no picture, just constant rebooting on plug in.
 
If the TV cycles the back lights every 15-20 seconds or so by itself, it's probably a bad display. Unplug the ribbon to the display and see if the back lights stay on.
kgpup <kgpupswitch@gmail.com>: Nov 14 02:42PM


> If the TV cycles the back lights every 15-20 seconds or so by itself,
> it's probably a bad display. Unplug the ribbon to the display and see
> if the back lights stay on.
 
I unplugged the ribbons, same thing - backlight flash at 1 second
intervals.
"ohg...@gmail.com" <ohger1s@gmail.com>: Nov 14 07:55AM -0800

On Tuesday, November 14, 2023 at 9:42:08 AM UTC-5, kgpup wrote:
> > if the back lights stay on.
> I unplugged the ribbons, same thing - backlight flash at 1 second
> intervals.
 
Unplug the harness from the main board to the power supply and plug in the AC. If the backlights come on and stay on with the main disconnected, your main is probably bad.
Jeff Liebermann <jeffl@cruzio.com>: Nov 13 11:37AM -0800

On Mon, 13 Nov 2023 12:12:05 -0000 (UTC),
 
>there was a lot of things I tried last time this happened - nothing worked
>gparted says unrecognisable drive format
>but I see this as prolly lost cause
 
At least gparted recognizes the drive.
 
If you want to try the software recovery method, there are plenty of
programs to choose from:
<https://www.google.com/search?q=flash+drive+recovery+software>
Most of these include a "trial" version of the program to test if
there is a chance at fixing the drive or recovering the data.
--
Jeff Liebermann jeffl@cruzio.com
PO Box 272 http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann AE6KS 831-336-2558
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Digest for sci.electronics.repair@googlegroups.com - 6 updates in 2 topics

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William van Niekerk <hearing.maths@gmail.com>: Nov 12 10:18PM -0800

My 2335 has been reliable for so many years and has now become faulty. The horizontal trace will only extend to about halfway of the scale and then folds backon itself. I have checked all the voltages on circuit board A12 and they are all good. I would appreciate any tips on how to diagnose this fault.
legg <legg@nospam.magma.ca>: Nov 13 09:05AM -0500

On Sun, 12 Nov 2023 22:18:59 -0800 (PST), William van Niekerk
 
>My 2335 has been reliable for so many years and has now become faulty. The horizontal trace will only extend to about halfway of the scale and then folds backon itself. I have checked all the voltages on circuit board A12 and they are all good. I would appreciate any tips on how to diagnose this fault.
 
Start with:
 
https://groups.io/g/TekScopes
 
Horizontal deflection is usually pretty simple circuitry.
 
Could be drive transistors going flakey.
 
RL
vjp2.at@at.BioStrategist.dot.dot.com: Nov 12 09:22PM

I printed stuff from USB at FedEx than transfered some files
from phone to USB then USB went blank. Took it home, same.
Is there any quick way to fix this?
 
Once my phone (same mfg but not this one) lost an entire SD card I never
recovered and that seemed to be because it went to zero power. I tried all
sorts of gparted utilities to no luck. (I had allowed the phone to partitin
the SD). I don't think I blanked an entire USB before.
 
 
--
Vasos Panagiotopoulos panix.com/~vjp2/vasos.htm
---{Nothing herein constitutes advice. Everything fully disclaimed.}---
Dan Purgert <dan@djph.net>: Nov 13 10:24AM


> I printed stuff from USB at FedEx than transfered some files
> from phone to USB then USB went blank. Took it home, same.
> Is there any quick way to fix this?
 
Go to $store of choice, and buy a new one. You mentioned gparted, so I
assume you have a Linux box -- what happens in dmesg when you plug it
in?
 
 
--
|_|O|_|
|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: DDAB 23FB 19FA 7D85 1CC1 E067 6D65 70E5 4CE7 2860
vjp2.at@at.BioStrategist.dot.dot.com: Nov 13 12:12PM

I got tons of free usb drives from trade shows
 
I got lotsa boxes.. I forgot dmesg - please remind me
there is also a partition fixer that comes with windows
it comes up but it doesn't tell me what params to use
 
the partitionson (DOS/XP/CAELinux) the system am using took a lot of work to
set up and I don't want to mess them.
 
there was a lot of things I tried last time this happened - nothing worked
gparted says unrecognisable drive format
but I see this as prolly lost cause
 
The goon ghules at android run rough shod on a lot of standards
 
 
In <slrnul3ucv.370.dan@djph.net> by Dan Purgert <dan@djph.net> on Mon, 13 Nov 2023 05:24:04 we perused:
*+-On 2023-11-12, vjp2.at@at.BioStrategist.dot.dot.com wrote:
*+->
*+-> I printed stuff from USB at FedEx than transfered some files
*+-> from phone to USB then USB went blank. Took it home, same.
*+-> Is there any quick way to fix this?
 
*+-Go to $store of choice, and buy a new one. You mentioned gparted, so I
*+-assume you have a Linux box -- what happens in dmesg when you plug it
*+-in?
 
 
 
--
Vasos Panagiotopoulos panix.com/~vjp2/vasos.htm
---{Nothing herein constitutes advice. Everything fully disclaimed.}---
Dan Purgert <dan@djph.net>: Nov 13 01:25PM


> I got tons of free usb drives from trade shows
 
> I got lotsa boxes.. I forgot dmesg - please remind me
 
Well, dmesg would show kernel-level logging when you plug in the device,
that is "does the machine even recognize what you've plugged in?".
 
Might not show partition details (in fact, it probably doesn't, beyond
"found 1 partition"), but it'll at least show things like the
manufacturer / serial number / etc. that will at least point towards
"what has failed" (e.g. if it gets the vendor data, but can't talk to
the flash ... might be a case of an "unsafe ejection" broke the
formatting on the flash).
 
 
--
|_|O|_|
|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: DDAB 23FB 19FA 7D85 1CC1 E067 6D65 70E5 4CE7 2860
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Digest for sci.electronics.repair@googlegroups.com - 1 update in 1 topic

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Bennett Price <bjprice@cal.berkeley.edu>: Nov 03 03:27PM -0700

On 11/1/2023 9:35 PM, Ajowa Dansowa wrote:
> How can I deactivate my General Electric fridge from demo mode? The model number is PS123SGMBKBS. Both the freezer and fridge side shows OFF and pressing any button to set the temperature does not work,
 
Try this:
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwibroa_76iCAxUZIkQIHUvUCKEQFnoECBAQAQ&url=https%3A%2F%2Fcustomernet.geappliances.com%2FCustomerNet%2FGE_Refrig_Demo_Instructions.pdf&usg=AOvVaw3MWj7gvXnSaI7QH1KHkKbL&opi=89978449
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Digest for sci.electronics.repair@googlegroups.com - 3 updates in 3 topics

9:41 AM Penedão 0 comments
Jean-Pierre Coulon <coulon@cacas.pam.oca.eu>: Nov 02 09:17AM +0100

We have replaced the floppy disk drive with a USB drive. Now sometimes, but
not always, the output file is only 1-byte big!
 
I use two methods:
1: key DISK, display to disk, to save a .78d-format file I have to convert.
2: key Output, ASCII, Ascii dump, enter, print screen, to save a simple text
file.
 
Am I the only one with this trouble? Of course I formated the new USB key.
 
--
Jean-Pierre Coulon
Jean-Pierre Coulon <coulon@cacas.pam.oca.eu>: Nov 02 08:22AM +0100

Thanks. I found a Panasononic BR 2/3 A battery on the bottom board after I
unscrewd the top board on the left.
 
--
Jean-Pierre Coulon
Ajowa Dansowa <ajowadansowa@gmail.com>: Nov 01 09:35PM -0700

How can I deactivate my General Electric fridge from demo mode? The model number is PS123SGMBKBS. Both the freezer and fridge side shows OFF and pressing any button to set the temperature does not work,
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