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08-09-2012, 11:28 AM
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#1 |
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Badcaps Veteran
Join Date: Jul 2005
City & State: ----
My Country: Sweden
Line Voltage: 230v 50Hz
Posts: 2,499
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What brand is this capacitor?
Cap is from the DC-DC PSU for a Siemens 840D computer, Mobile Pentium 2 333Mhz CPU running NT4, same as this one but an older model...
I exchanged only this one cap, the rest are Rubycon and Nichicon and look pristine, the system is about 10 years old. They put the PSU's "startup cap" or timer cap wedged between the primaries, a couple switching diodes and a big heatsink, so not very strange that it failed eventually. (Which also made it a PITA to replace!) System would not power on after a 4 week vacation, and before that it had problems starting up so I was pretty sure it would be this "startup cap". And I was right, I replaced it with a Rubycon ZL 100µF 25v (closest match I had) and it booted straight up. It's funny that a $0.02 cap can prevent a machine costing around $500000 from booting  But what bothers me is I can't identify the little bugger, has anyone got a clue what brand this is and what it's specs are? We have 3x machines with this kind of control system so it would be nice to replace it with something that is closer to the originals next time one fails...
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08-09-2012, 12:18 PM
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#2 |
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Slow Learner
Join Date: Dec 2010
City & State: Lancashire UK
Posts: 4,657
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Re: What brand is this capacitor?
Is that a logo under the M9K0 can you do a straight on picture and
is there something after the BC116 Perhaps it is an early panasonic though I am not sure why you are bothering. You're in the enviable position of knowing the voltage and the uf yet you choose to ignore that and use something else? If it is 10 years old then almost any good make modern capacitor should exceed its specification. |
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08-09-2012, 12:33 PM
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#3 |
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Badcaps Veteran
Join Date: Jul 2005
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My Country: Sweden
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Re: What brand is this capacitor?
No it's not a logo, it's just that the sleeve has cracked a bit causing something which looks like a pattern, it looks worse in the photos than it does in real life...
Nope, there is nothing after the BC116 I just want to know that I'm not going too much over spec (i.e. too low ESR etc) as that could cause problems. When I measured it the ESR meter could not get a reading so it's crap now alright I did not ignore the µF rating, I just took the closest thing I had, normal caps have a rating of +/- 20% anyway so that should be (almost) ok. But I'm not even sure the original cap is LOW ESR at all... |
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08-09-2012, 01:12 PM
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#4 |
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Badcaps Veteran
Join Date: Aug 2005
City & State: San Jose, CA
My Country: USA, Unsure of Planet
Line Voltage: 120VAC, 60Hz & 115VAC, 400Hz
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Re: What brand is this capacitor?
Isn't there a company called BC Components? If so, maybe ...
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08-09-2012, 01:20 PM
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#5 |
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Slow Learner
Join Date: Dec 2010
City & State: Lancashire UK
Posts: 4,657
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Re: What brand is this capacitor?
I think you have gone too low - over would have been better.
We usually tell noobies never to fit lower uf as lower uf is the same as a failing cap? In saying "normal caps have a rating of +/- 20% anyway so that should be (almost) ok".are you assuming the 150uf cap is 20% lower and the 100uf cap is 20% higher. If the 150uf cap was spot on or higher and the 100uf cap was 20% lower then the gap is significant. Trouble is you said yourself it was difficult to fit - in time the uf will probably fall (At least that is what I believe) not rise so at some point it will reach a fail state quicker than if you set off at the correct value. Im just trying to save you doing the job twice. Did they have or record ESR 10 years ago? |
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08-09-2012, 01:31 PM
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#6 | ||
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Badcaps Veteran
Join Date: Jul 2005
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My Country: Sweden
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Re: What brand is this capacitor?
Quote:
Perhaps kc8adu will know, if he stumbles over this thread, he fixes old PLC's afterall  Quote:
Obviously this was a test to see if the system would work, since this was what I had at hand I used it. It's not meant as a permanent fix, hence this thread so I can fix it properly instead |
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08-09-2012, 01:50 PM
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#7 |
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Member
Join Date: Jul 2012
City & State: Shin-chu
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Posts: 52
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Re: What brand is this capacitor?
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08-09-2012, 05:31 PM
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#8 |
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Badcaps Veteran
Join Date: Dec 2008
Posts: 3,026
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Re: What brand is this capacitor?
According to this, these are Phillips branded capacitors manufactured by Vishay.
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08-10-2012, 08:40 AM
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#9 |
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Badcaps Veteran
Join Date: Jul 2005
City & State: ----
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Re: What brand is this capacitor?
Thanks, seems to be rated for 0.5 ESR and 260mA ripple
So that Rubycon ZL I used is way overkill. Thank you very much, now I know what to look for |
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08-12-2012, 07:18 AM
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#10 |
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Badcaps Veteran
Join Date: Aug 2005
City & State: San Jose, CA
My Country: USA, Unsure of Planet
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I'm a: Professional Tech
Posts: 1,592
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Re: What brand is this capacitor?
Vishay is like Tyco, a growth-by-acquisition components company. Vishay's specialty used to be ultra-precision, ultra-low temperature coefficient resistors. Maybe they've improved in the past few years, but the user-friendliness of Vishay's website for it's divisions' products bordered on unusable.
Folks here might see the products of one of Vishay's divisions, Siliconix, which makes power MOSFETs. Vishay also bought IR's older HexFET line of MOSFETs and folded that into Siliconix. |
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09-06-2012, 09:04 AM
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#11 |
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Badcaps Veteran
Join Date: Jul 2005
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Re: What brand is this capacitor?
I had a look at the replacement PSU we ordered for this system today.
The machine is still running fine with the old recapped PSU... In it I see one change, the startup capacitor is now a Rubycon ZT So it seems my ZL was not such a bad choice afterall, the ZT is rated for 125°C |
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