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Oliver Wilson <oliverwilson@its.invalid>: Mar 22 12:37AM -0400 Anyone have experience with these 2 Centos Dell PowerEdge 830 errors? (1) PCIe Training Error: Embedded Bus#00/Dev#1C/Func#4 (2) SATA port 0 not found   I'm in a small training class where the teacher's old computer died. I told her I'd look at it where those are the two errors on the screen. (1) https://cdn1.imggmi.com/uploads/2019/3/22/682cc0489fb1b14d13b8b9d62c857074-full.jpg (2) https://cdn1.imggmi.com/uploads/2019/3/22/e4298661477cb43bcbf788d135f23977-full.jpg   Opening the case, I see only this card in a long slot on the motherboard. https://cdn1.imggmi.com/uploads/2019/3/22/cda5568220f2c5fe51a1e452de059e9e-full.jpg   I don't know what the card does but it has an SATA cable to each of 4 HDDs. https://cdn1.imggmi.com/uploads/2019/3/22/cb54c28ae2f721e3de71a916f27059c4-full.jpg   It seems disk 0 of the four disks is "unknown device" for some reason. https://cdn1.imggmi.com/uploads/2019/3/22/05b4cd669244d8b161aa02595e73b67f-full.jpg   Only 3 of the 4 "Arrays" are found (What is an array? Is that a disk?) https://cdn1.imggmi.com/uploads/2019/3/22/5d842ac2bbd08fb429d611e4afcc8eae-full.jpg   Do you have debugging advice that I can give to this teacher for her Dell? f

dansabrservices@yahoo.com: Mar 22 03:57AM -0700 On Friday, March 22, 2019 at 12:37:43 AM UTC-4, Oliver Wilson wrote: > https://cdn1.imggmi.com/uploads/2019/3/22/5d842ac2bbd08fb429d611e4afcc8eae-full.jpg   > Do you have debugging advice that I can give to this teacher for her Dell? > f   My first inclination is to think that the card is a raid controller and that the first disk has failed. Part of the "conversation" is to identify each device to the controller. These are smart devices these days. I would check disk 0. The disk itself is probably OK, but its controller may have failed.

Andy Burns <usenet@andyburns.uk>: Mar 22 01:58PM > identify each device to the controller. These are smart devices > these days. I would check disk 0. The disk itself is probably OK, > but its controller may have failed.   The RAID card seems to have four SATA devices attached, apparently all working, which are formed into three arrays   since there are two 80GB disks ST380013, those are both likely members of the RAID 1 74GB array#2   The single 500GB ST3500320, is likely a single disk volume, 465GB array#1   and the single 1TB WD1003FZEX is likely the single disk volume 931GB array#0   so I'd say the physical and logical disks are fine, and that at some point the RAID controller is talking to them, the issue seems to be the server is sometimes having issues negotiating PCIe links to the RAID card   if you're lucky try removing and re-seating the PCIe card in case it's a loose contact, but other people seem to have either failed capacitors or a mismatch of PCIe generations between the card and the motherboard   <https://serverfault.com/questions/310041/dell-poweredge-pcie-training-error-what-to-do>

Oliver Wilson <oliverwilson@its.invalid>: Mar 22 12:19PM -0400 Re: Fri, 22 Mar 2019 13:58:50 +0000,   > if you're lucky try removing and re-seating the PCIe card in case it's a > loose contact, but other people seem to have either failed capacitors or > a mismatch of PCIe generations between the card and the motherboard   I am confused.   The PCIe slots are the black unused slots I think where there is only one card, which is that RAID card you indentified.   I did move the RAID card from the leftmost long white slot to the rightmost long white slot and that "helped".   Both errors remained but at least the machine booted to CentOS after I did that switch (and also reseated all cables, blew all dust out, rebooted, so it could be any number of things that allowed the machine to boot to CentOS).   My main confusion about the SATA 0 unknown is whether it's the 1TB disk that's bad, or the RAID card that is bad.   I seem to see you saying that you think the 1TB drive is actually good? Did I understand that correctly?   If the 1TB drive is likely good, then are you saying the RAID card is likely bad?

"J.B. Wood" <arl_123234@hotmail.com>: Mar 21 12:47PM -0400 On 3/21/19 9:33 AM, Adrian Caspersz wrote:     > and also   >  250W PWM inverter circuit SG3524 >  http://www.circuitstoday.com/pwm-inverter-circuit   Hello, and thanks for the above link and the others! Looks like those designs depend on R-C time constants rather than crystals. And crystals, like resistors and capacitors can age with time. Whether or not those designs you referenced are employed in inverter generators is TBD. It's not so much an issue which time-base (oscillator frequency) works better when new at room temp but how it behaves in the outdoor operating environment of temperature, humidity, vibration, rough-handling, etc, including component aging. Mea culpa for posting design questions to a repair ng. Sincerely,   -- J. B. Wood e-mail: arl_123234@hotmail.com

Jeff Liebermann <jeffl@cruzio.com>: Mar 21 10:25AM -0700 On Thu, 21 Mar 2019 06:26:39 -0400, "J.B. Wood" >reference, not the rpm of the engine. A crystal seems a likely >candidate as I don't think these appliances have an internal cesium or >rubidium clock :-) Sincerely,   Ceramic (piezo) resonators are a more likely frequency determining element. <https://en.wikipedia.org/wiki/Ceramic_resonator> I'll resist the temptation to tear apart my neighbors Genrac inverter generator to see what it uses. Ceramic resonators have 3 big advantages over quartz crystals: 1. They're cheaper. 2. They're cheaper. 3. They're cheaper. However, for a non-critical frequency reference, such as the 50/60Hz from an inverter, a simple RC time constant with some temperature compensation would probably be good enough.   Conventional gasoline generators usually run at 3600 rpm, which sets the output frequency. Inverter generators can adjust the rpm to match the load and have the inverter section determine the output frequency. That also allows the generator to brushless, quiet, more efficient, and have a faster response to changes in load.     -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558

Mike <ham789@netscape.net>: Mar 21 10:49AM -0700 On 3/21/2019 9:47 AM, J.B. Wood wrote: > operating environment of temperature, humidity, vibration, > rough-handling, etc, including component aging.  Mea culpa for posting > design questions to a repair ng.  Sincerely,   Youa culpa because you posted a vague question and expected a precise/exact answer. How much accuracy do you need? Call up a few vendors and ask if they can meet that spec over all your environmental conditions and time. Good luck with that.   If you need PRECISE frequency, you'll probably also be unimpressed with the phase noise, or high frequency components of the digital approxmiation to a sine wave.   The reason to have an inverter is reduced fuel consumption under light load. I don't have any specific info, but expect that there are inverter generators that do not have accurate sine wave output.   Your problem is likely much more complex than you think.   People can't help solve your problem if you can't disclose it. Feel free to continue to waste your (and other's) time.

"J.B. Wood" <arl_123234@hotmail.com>: Mar 21 02:30PM -0400 On 3/21/19 1:49 PM, Mike wrote:   > environmental conditions and time.  Good luck with that.   > People can't help solve your problem if you can't disclose it. > Feel free to continue to waste your (and other's) time.   Hello, and I see nothing "vague" about my OP. And I don't think I ever implied I had a "problem" nor that I was attempting to construct the subject appliance. I had a question about commercial design practice and was seeking some info that I thought some folks on this ng might know as a result of either repair experience and/or had seen circuit schematics. Nothing else. Apparently some more polite folks on the ng saw it this way and folks have helped despite my "lack of disclosure". And if you thought it was a waste of your time why bother to respond at all? Judging from your response I think you wasted your time. Sincerely,     -- J. B. Wood e-mail: arl_123234@hotmail.com

Fox's Mercantile <jdangus@att.net>: Mar 21 02:06PM -0500 On 3/21/19 1:30 PM, J.B. Wood wrote: > And if you thought it was a waste of your time why bother > to respond at all?   Because, some people, all they have to contribute is to piss in somebody's Wheaties.     -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com

"pfjw@aol.com" <peterwieck33@gmail.com>: Mar 21 12:35PM -0700 Put in a search (12 to 120 Volt true RMS inverter schematic) and got this, right on top.   https://web.wpi.edu/Pubs/E-project/Available/E-project-042507-092653/unrestricted/MQP_D_1_2.pdf   Complete with nice pictures and scope screen-shots.   Looks like the LM348 does the trick.   Peter Wieck Melrose Park, PA

tabbypurr@gmail.com: Mar 21 01:14PM -0700 On Thursday, 21 March 2019 18:30:09 UTC, J.B. Wood wrote: > and was seeking some info that I thought some folks on this ng might > know as a result of either repair experience and/or had seen circuit > schematics. Nothing else.   I can disappoint you then. My answer comes from understanding the principles behind the designs, which comes from years designing electronic stuff. I've never taken such a gen apart nor do I need to to understand why no-one in their right mind is going to derive the 50 or 60Hz from a crystal. Nor are they likely to clock a rock bottom price processor with a crystal.   Everyone has their point of view, and that's all good, but when you have not a clue and repeatedly criticise those that do, and then criticise peoples' fair criticisms of you... at least the rest of us can figure out where that goes.

bruce2bowser@gmail.com: Mar 21 02:55PM -0700 > > candidate as I don't think these appliances have an internal cesium or > > rubidium clock :-) Sincerely,   > Welcome to the filter.   The crystal filter? A crystal with several electrodes used to filter frequencies?

tabbypurr@gmail.com: Mar 21 06:34PM -0700 On Thursday, 21 March 2019 19:07:19 UTC, Fox's Mercantile wrote: > > to respond at all?   > Because, some people, all they have to contribute is to piss > in somebody's Wheaties.   do you never get fed up with people being stupid?

Fox's Mercantile <jdangus@att.net>: Mar 21 08:37PM -0500 > do you never get fed up with people being stupid?   Do you never get tired of always having to be right, even when you're not?     -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com

tabbypurr@gmail.com: Mar 22 03:09AM -0700 On Friday, 22 March 2019 01:37:29 UTC, Fox's Mercantile wrote:   > > do you never get fed up with people being stupid?   > Do you never get tired of always having to be right, even > when you're not?   that's not the situation here.

mroberds@att.net: Mar 21 10:21PM Hello all!   I have an old Schumacher car battery charger, model SE-60, that I am trying to repurpose for something else (powering 12 V lighting). It is probably about 20 years old. The main component is a transformer that is probably rated for about 120 W, as it was a "10 amp" charger.   The primary side (120 V) of the transformer has a type of quick- disconnect that I haven't seen before. The windings are terminated to small metal "boxes" on the edge of the coil former, and the wires to the rest of the charger have a slotted tab connector that plugs into the "box".   The charger was partly disassembled in the past and not all of the internal wiring is there, so I only have one of the slotted tab connectors, but I need two. I can probably Dremel on a standard 0.25" or 0.187" tab connector and make it work, but I figured I'd ask to see if anybody recognizes this thing.   Photos of the connector in question, on 6.3 mm (0.25") graph paper:   http://birdbird.org/tmp/front.jpg http://birdbird.org/tmp/back.jpg   The overall width of the forked end is about 3.5 mm. The slot is about 1.5 mm wide and 3.7 mm deep. The overall length of the flat portion (in other words, excluding the crimp barrel), is about 8 mm. It is crimped to a piece of 16 AWG wire.   I know the transformer basically works; for bench testing, I just jammed some bare wire into the "box". For production, I would like it to be a little more secure.   I took a quick look at the 3M (Scotchlok), TE (nee Amphenol, Faston), and Panduit catalogs online, but I didn't see anything that matched. The closest thing I found were fork terminals for small studs or screws (#4), but even those are a little bit too big.   Thanks!   Matt Roberds

tabbypurr@gmail.com: Mar 21 06:37PM -0700 > screws (#4), but even those are a little bit too big.   > Thanks!   > Matt Roberds   Your nearest thing is going to be some form of crimp connector. But the transformer may deliver more than 12v, that needs checking first. Of course V_out will rise if underloaded too.     NT

tabbypurr@gmail.com: Mar 21 01:02PM -0700 On Thursday, 21 March 2019 14:39:57 UTC, Ralph Mowery wrote: > at the Arduino processor boards. They can be bought from China for > about 2 ot 3 dollars. They are powerful enough to run the inverter part > of the inverter.   No sensible manufacturer is going to use a crystal` where they can use a ceramic resonator or a silicon oscillator built into the chip. And no sensible mfr is going to pay for a crystal plus a divide by massive number circuit when they can use a low frequency oscillator. If you can't see why there's nothing further for us to discuss.

Fox's Mercantile <jdangus@att.net>: Mar 21 10:54AM -0500 Tabby just wants to find fault with everything.   -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com

"Ron D." <ron.dozier@gmail.com>: Mar 21 12:05PM -0700 I had trouble with them too. I wanted a SM on CD and on USB (don't ask me why) They had essentially the same description but a different price. I got two SM's on USB. Getting the SM on CD to forever and a day.   Having general issues with Samsung too.

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