PA3X shuts down randomly

[AntonySharmman]

Hi my dear friend Rob , invitation still insists !
It's very difficult up to impossible to recreate this issue so we must focus on guys that have that issue to investigate
the deeper caution that will also help KorgPa.
If this is a matter of hardware switching sensitivity then this function must urgently removed from OS code , and all
will be happy with next upgrade !
Update : Rob , now I noticed your input ... Thanks , but let people express freely , I'm here to explain !

deanspy you are lucky and I can say that you just fell in case ,
since I'm the main designer of two companies that manufacture Switching Power Supplies and one of the most
qualified persons to advice both you and electric engineer that SMPS of Pa3X as the majority of your equipment ,
are working with rectified 150 (300v Eu) DC volts of any waveform , even with DC 100 V (190v Eu) of battery source.
Even the most abrupt rise of a pulse waveform, will be filtered by the large electrolytic capacitors of SMPS rectifier
without the slightest trace of noise floor.
Therefore the only reason to use Yes ... the cheapest UPS, is total loss of Net power supply since UPS will continue
supplying the device during a complete net power loss via ST-By Acid Battery !

Note that SMPS of Pa3X , is a UPS without a ST-BY battery ... that can easily handle 75 - 280 AC volts variations
(SMPS=Switching Mode Power Supply)

I know that most of you just repeat what you're told , but just FYI ,accurate sinusoidal waveform is required
mostly in inductance loads , compressors and devices with classic supply transformers , besides UPS device by definition
and FCC rules , always produces sinusoidal AC waveform , even the cheap one , otherwise it's not UPS but "regulator" !
And by the way never use "thyristor" auto-transformer regulators for your audio equipment , this is the real disaster !

That's for the story for topic to be more educational ! and sorry from those who don't give a dime !

[Marcus2222]

Hi Dean,

....there are many cheap UPS supplies that will work fine with a computer but which have a "Square Wave" output that will generate a lot of unwanted mains noise interference when used with audio equipment such as the Pa3x.

We are recommending any small UPS with a rating above 400VA and with a "Pure Sine Wave" output.

That's very interesting what you said here. I wasn't aware about the square wave vs. a sine wave.

I was transferring files from my computer to my professional $500 MP3 player when lightning must have hit during a storm. The player got zapped and a huge repair bill. It made me realize I need protection from now on....and UPS while I'm at it.

I was looking at a few of them from the big manufacturers: APC CyberPower TrippLite
There are so many models that you get dizzy reviewing them. I picked a few out, this being one of them:

http://www.tripplite.com/en/products/mo ... delID=3193

....seems to have good specs, LED display, rack mountable, etc but a bit heavy for portability. There are others.

A question: does this sine wave rule apply to MP3 players also? And what are the most important specs to look at?

I haven't figured out what to buy yet because I need a portable unit that I can use with both keyboard and mp3 player.

[deanspy]

All I can share is my experience. I meant no disrespect.

I was working for a multinational foodservice company where I designed and installed POS (point-of-sale) systems that used a similar platform to today's keyboards (basically - a computer with a switching power supply).

I have personally witnessed systems come back from the dead when introducing common mode protection and voltage regulation at the mains.

I have witnessed software that once performed erratically magically perform to spec upon introduction of these devices into the flow.

This experience has served me well musically over the last 40 years, as I have witnessed similar situations with keyboards and sound modules, therefore I personally don't leave home without it.

Your own mileage, as they say, may vary

[AntonySharmman]

Experience can be divided in many branches two of them are consumer experience that just passively remark phenomenons
and can't really distinguish the limit and dimension between cause & reaction of electrical & main design of any electronic device
and engineers experience that work on lab all these applications with deep applied knowledge in electronics and are aware of
any possible malfunction and precautions to eliminate the issues from scratch !

Therefore my intention is to inform about issues you don't really know the real causes and save your money from
wrong direction expenses.

A real home UPS to prevent your whole home - studio from over-voltages or net supply loss is estimated over 10.000 $ so the
right option is to protect only sensitive appliances with different UPS modules suitable for any of them , and hundred of pages
are needed to describe all partial methods , but for Pa3X standalone , what you need is clearly explained !
One thing that you must realize is that 90 % of your modern devices from TV , DVD , up to your PC,Screen ect
are using SMPS so no over-voltage protection is needed any more , the only sensitive devices in your home still remain
AC compressor motors.
Also note that lightning (>100.000v) overlaps any UPS device & isolators and destroys everything where applied !

So there is no matter of disrespect or anything else at all , I make my knowledge available for anyone wants a deeper
look of what really is happening there , and choice is entirely yours !

[Dan_]

Guys, thank you for all this knowledges but sincerly, don't you think it's a matter of version? I did not have this problem even once with 1.50 !!

[AntonySharmman]

Guys, thank you for all this knowledges but sincerly, don't you think it's a matter of version? I did not have this problem even once with 1.50 !!

This is good news , 'cause OP can be easily changed but not hardware !
But did you really downgraded to v.1.5 or still speculate ?
If yes ... stay tuned on v1.5 for some time and let us know !

[JayLou]

Had a similar issue this morning. Went downstairs and unit was powered on. Didn't think I left it on. Went to turn it off and the unit would not turn off. Humidity is up at this time of year. Unplugged to turn off. Any advise.

[Marcus2222]

It is more likely to be dirty power. This is the surprising answer for many hardware and software problems.

I never leave home without a proper power conditioner and voltage regulator. If you are using a cheap UPS, your problems could be doubled by square wave supply.


http://www.furmansound.com/product.php? ... d=P-1800AR

or something similar. This is the 120V version.

I have had equipment and computer problems disappear from venues after using this product.

That might or might NOT be the answer to the PA3x "shutdowns" but it certainly makes one think about your power supply.

http://www.thegearpage.net/board/showth ... ?t=1109543

" I have a AR1215 and it's saved a few gigs with iffy power. Gets rid of neon buzz and crappy power in general. I have my amp tech bias my amps at a true 120VAC and my tone is very consistent. I've never used an 1800, so I can't comment on it, but my keyboard player insists that I bring the 1215 to every gig. There was one time in particular that his Kurzweil was shutting off and it saved the day...now he won't plug into anything else. I don't know about plugging the whole band into it, but we share it with no issues..."
____________

[tonsy]

found this problem on my pa3x,,,just formatting the HD on my pc then check error on it,,found some error cluster on it..then i reinstal with new OS..its works again >>does any one know,,pa3x system is different than pa800/2x..pa3x OS is on the internal HD not on the internal SSD ,,i knew this coz i've exchanged my 61 HD(usb pen) with my pa3x HD then i just realized that all my setting on my 2 keyboards are exchanged..not just the user area only..but the factory too and all setting of them... (sorry for my poor english)