Digest for sci.electronics.repair@googlegroups.com - 12 updates in 3 topics

whit3rd <whit3rd@gmail.com>: Mar 26 07:02PM -0700

On Tuesday, March 26, 2019 at 10:12:02 AM UTC-7, David Farber wrote:
 
> I was testing the battery voltage where the battery holder's terminals
> are soldered to the board.
 
Good. And, the usual self-test can/should exercise the chip that
keeps the timer running. It won't, necessarily, test the time accuracy,
and a typical such system uses a quartz crystal with a couple of
small capacitors. The crystal could be fractured, or (worse) one
of the capacitors could be shorted. Tiny capacitors, only gonna
be able to find 'em because they're next to the rock.
whit3rd <whit3rd@gmail.com>: Mar 26 10:49PM -0700

On Monday, March 25, 2019 at 2:59:29 PM UTC-7, John Robertson wrote:
 
> Something is wrong with the on-board RTC - Real Time Clock.
 
> You need to identify that chip or module and first see if its crystal is
> damaged.
 
Another poster has suggested a circuit diagram
<http://kythuatphancung.vn/uploads/download/22163_DELL_N5110.pdf>
 
and the crystal would be X2101 and its associated components, R2101, C2101, C2102,
depicted on 'sheet 21 of 108' (see the label on lower left page corners) and connected
to pins A20 and C20 of the 'Cougar Point' big integrated circuit.
David Farber <farberbear.unspam@aol.com>: Mar 27 09:06AM -0700

On 3/26/2019 10:49 PM, whit3rd wrote:
 
> and the crystal would be X2101 and its associated components, R2101, C2101, C2102,
> depicted on 'sheet 21 of 108' (see the label on lower left page corners) and connected
> to pins A20 and C20 of the 'Cougar Point' big integrated circuit.
 
On page 99 of the schematic you can see the CMOS battery output labeled
as RTC_AUX_S5. I did a text search for that and it took me to page 27
which shows VBACKUP. There are two partial circuits there. One appears
to be for the CMOS battery backup and the other one, 3D3V_AUX_KBC,
appears to be the backup power supplied when the unit is turned on. Both
of these circuits point to EC GPIO72. Regarding the RTC_AUX_S5 diagram,
there's an orange ellipse around the specifications for a resistor. It
says 10mW 0R0402-PAD-2-GP. Might that be a fusible link? Also, I see the
words "stuff" and "un-stuff" appearing frequently in the schematic. Are
those synonyms for install and remove?
 
Thanks for your reply.
--
David Farber
Los Osos, CA
Cursitor Doom <curd@notformail.com>: Mar 27 01:40AM

On Tue, 26 Mar 2019 13:14:02 -0700, tabbypurr wrote:
 
> A simple nonsequitur. You might not wish to do a minor repair to save
> $100-400, but some do. And sometimes getting an oven that fits a certain
> space can be tricky, repairing is then much quicker.
 
And of course it's not all about the money. AFAIC, the prime motivation
is not throwing out a perfectly serviceable appliance simply because it
"packed up one day" when the fault most often is the failure of some
minor component costing just pennies.
 
If there's one thing I can't stomach, it's waste. It's verging on
criminal for someone with an electrical background to not even bother to
investigate the cause of a problem in an electrical appliance.
 
 
 
 
 
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Cursitor Doom <curd@notformail.com>: Mar 27 01:43AM

On Tue, 26 Mar 2019 17:11:09 -0500, Fox's Mercantile wrote:
 
> A cheap microwave for under $30 used.
> And a new toaster oven for under $30.
 
> Any questions?
 
Your *own* microwave back in service for under $3 worth of parts and half
an hour of your time.
No contest.
 
 
 
 
 
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Fox's Mercantile <jdangus@att.net>: Mar 26 09:16PM -0500

On 3/26/19 8:43 PM, Cursitor Doom wrote:
 
> Your *own* microwave back in service for under $3 worth of parts and half
> an hour of your time.
> No contest.
 
Have you priced a mechanical timer? Or a CPU based controller?
 
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
tabbypurr@gmail.com: Mar 26 07:17PM -0700

On Tuesday, 26 March 2019 22:11:17 UTC, Fox's Mercantile wrote:
 
> A cheap microwave for under $30 used.
> And a new toaster oven for under $30.
 
> Any questions?
 
Yes. What wally thinks a cheap nuke and a toaster oven is a good replacement for a combi oven?
tabbypurr@gmail.com: Mar 26 07:39PM -0700

On Wednesday, 27 March 2019 02:16:55 UTC, Fox's Mercantile wrote:
> > an hour of your time.
> > No contest.
 
> Have you priced a mechanical timer? Or a CPU based controller?
 
I don't recall paying more than around $3 for a dead nuke for tranplant purposes.
And a lot of faults are cheap parts like diodes & fuses.
 
 
NT
"pfjw@aol.com" <peterwieck33@gmail.com>: Mar 27 05:44AM -0700


> A simple nonsequitur. You might not wish to do a minor repair to save $100-400, but some do. And sometimes getting an oven that fits a certain space can be tricky, repairing is then much quicker.
 
OK - let's cut to the chase:
 
a) Combination Microwave Ovens are much like BMW cars. Wannabes. As a BMW wannabe a Porsche or Wannabe a Mercedes, but does neither as well, a combination microwave does neither function as well as a dedicated oven. That is not to suggest that a BMW is not a well-made vehicle, but that it is neither a Porsche nor a Mercedes.
 
b) "For a certain space" - Fitting a function to a specific device has consequences, and in the case of a failure, not good ones. And, for the record, when it comes to a kitchen, aesthetics will ALWAYS defer to function, cleanliness and good light on our house. It is entirely possible to have both, but built-in devices are difficult to service, often difficult to replace quickly - as in on the Wednesday before Thanksgiving, or Christmas Eve.
 
c) Quicker - sure. If the parts are in hand and/or the problem is simple. If not, I could have a new *insert appliance here* installed in our house within 24 hours at the outside, and if on a non-holiday before 8:00 pm, within 2 hours.
 
d) Waste and Landfill - metal parts, appliances and such in this region go to Acelor-Mittal in Coatesville, PA, where they are shredded, materials separated, then become new steel in the oldest continuously operating steel mill in the United States - over 206 years.
 
https://usa.arcelormittal.com/our-operations/steelmaking/coatesville
 
https://hsp.org/blogs/archival-adventures-in-small-repositories/the-land-of-iron-and-steel
 
So, at one level, recycling steel reduces the use of energy, mine waste, transportation, coking, smelting and so forth. And. Acelor's shredding plant pulls out the copper, aluminum, glass and plastics as well - all highly automated.
 
Peter Wieck
Melrose Park, PA
Cursitor Doom <curd@notformail.com>: Mar 27 03:54PM

On Tue, 26 Mar 2019 21:16:48 -0500, Fox's Mercantile wrote:
 
>> half an hour of your time.
>> No contest.
 
> Have you priced a mechanical timer? Or a CPU based controller?
 
Why on earth would I? Only a fuse and a diode failed!
 
 
 
 
 
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Rheilly Phoull <rheilly@bigslong.com>: Mar 27 09:52AM +0800

On 27/03/2019 2:42 am, bitrex wrote:
 
>> John
 
> Not this one, apparently. 'supposed to be why I make an account with
> them to order and _they_ keep a damn database for! :(
 
All the items I have registered online ask for the details like the
serial number, did you somehow register without that info?
Andy Burns <usenet@andyburns.uk>: Mar 27 07:34AM

Mike Coon wrote:
 
> usenet@andyburns.uk wrote:
 
>> get-ciminstance win32_bios | format-list serialnumber
 
> On a device that does not power up?
 
Yeah no use, I started reading from the end of the thread, sorry.
 
On the last Lenovo I bought, several of the stickers underneath faded or
peeled off by themselves, but the S/N sticker is still readable, there's
also a second sticker in the battery hatch.
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