Re: Creative Gigaworks S750
According to A817's datasheet typical forward voltage is 1,2V which is well within 2V range of Metex 3640.
Three Q817B marked optos I stripped from old failed Enermax show 0,95V @ ~1mA measuring current which fits to datasheet.
Good thing I didn't throw that junk away when getting it five years ago as failed old CWT (other primary CrapXon bulged and 5Vsb dead) I got last summer from PC of friend's family doesn't have any optos.
And looks like that friode really is in power input for standby after all:
In standby's...
EsaT
Member
Last Activity: 12-28-2010, 08:38 AM
Joined: 12-04-2010
Location: Finland
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Re: Creative Gigaworks S750
Guess it's time for update as I've now gotten forward in investigation.
Standby's switcher is TOP243Y (seems instact as that LED blinked indicating some life and nothing is shorted between legs) and that little Suck'scon which gave fart connects to its control leg/pin (where opto is connected) through resistor.
There's basic single diode rectifying for transformer's outputs and then L7920, L7908, L7809 and L7824 regulators in "secondary" heatsink.
Opto's emission end seems to be burned broken as forward voltage...Leave a comment:
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Re: APC Back-ups RS 1500 Dead
Guess they had to cut costs elsewhere to cover that LCD...
Nothing like this todays trend of maximizing profits by supposedly "quality" brands.
Like new CX-serie PSUs from Corsair... or this PC P&C UPS:
[url]http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=159[/url]Re: APC Back-ups RS 1500 Dead<br /> ...e new CX-serie...Leave a comment:
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Re: intel ICH9R raid question
Also these cards are easy to differentiate from real HW RAID cards basing to price as without real hardware they cost very little... and if you look card losely pretty much only component (beside passive basic components) they have is standard run of the mill SATA controller.
Also any verifying checks and such go on background without causing any extra load to OS, processor or any motherboard bus.
I myself got 3ware 9650SE-8LPML some four years ago as I didn't want RAID to be dependant on any drivers or software and at...Leave a comment:
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Re: Creative Gigaworks S750
Wasn't even intending to use just equally rated parts... although I suspect life time etc specs of those cheap China caps being all exaggerated just like advertising specs of cheap PSUs.
DigiKey just doesn't seem to list/stock many top specced Japanese capacitor series so that with size limits seems to limit options rather well for primary caps:
Nichicon GU or Panasonic TS-HB for 470uF/200V main caps
Chemicon KXG for standby's 68uF/450V (also 82uF would fit)
In secondary height isn't that limited so that gives...Leave a comment:
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Re: Creative Gigaworks S750
At least neither end of opto is shorted and same goes for D26 which seems as normal as it's possible to say without detaching it.
Four 470uF 200V (22x36mm) primary caps are snap in models and standby's 68uF 450V cap is equally high but normal leaded. (18mm diam.)
Also 40mm high ones could just fit in without removing heatsink but it's probably best to avoid decreasing gap between capacitors and heatsink for allowing better airflow.
What would be good capacitor series for these "job positions"?
...Leave a comment:
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Re: Is it possible...
If you mean small fan connectors that fourth pin/wire is for PWM control signal for speed control chip integrated into fan itself.
In normal/older three pin fan connector third pin is for RPM signal
[url]http://www.allpinouts.org/index.php/Motherboard_(CPU)_3_Pin_Fan_Connector[/url]Re: Is it possible...<br /> <br /> ...<br /> <br />...Leave a comment:
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Creative Gigaworks S750
Few days ago there was popping sound from subwoofer unit under minute after turning speakers on and then it went dead with control pod showing no power.
Quick googling showed that in UK people have had these to blow fuses but 3,15A glass tube fuze under power cord socket is intact, and neither did 10A plug fuse trip even though it's probably faster to react.
After taking unit out from under the table I tried turning power switch and unit's power LED blinks like in some search results of this speakers dying problem.
After that I unscrewed about dozen screws and already... -
Re: New Members - please post your introductions here
Hello from Finland where sun sets around 3pm at this time of the year and -10C is hot day outside...Leave a comment:
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