Goofy non-standard CrapXon

Shocker · 05-23-2012, 01:13 AM

I have an otherwise decent 12V 3A plugpack let down by craps. (Oh so familiar...)

What's bugging me is not that the caps are crap, but that the primary cap is a custom-sized CapXon KW. It's 68µF 400V and 18mmD x 25mmL. It's bulging on top and leaking around the positive lead. The plugpack wouldn't start up, and I'm pretty sure this is to blame. A longer cap would be blocked by the fuse and inlet.

The secondary caps are 2 x CapXon KF 1000µF 16V 10mm and 1 x Teapo SC 680µF 16V 8mm. None of them are bulged, but best to play it safe.

There's also a Teapo SEK 100µF 25V 6.3mm near the transformer which I figure should be replaced with a low ESR cap. Anyway, the big cap is the main problem. Curiously, CapXon has the size mentioned in the KM series - yeah, like that's gonna help

. I then looked at SamXon's KM series, but that didn't take me anywhere. Guess what the only other manufacturer with a 68µF 400V 18mmD x 25mmL general purpose cap was???

mockingbird · 05-23-2012, 02:06 AM

Rubycon and Panasonic both show an 18x25mm part:

http://www.newark.com/rubycon/450txw...ial/dp/39T8985
http://www.newark.com/panasonic/eeue...ial/dp/39P9916

Shocker · 05-23-2012, 02:29 AM

I'll consider them. But guess who I was thinking of when I wrote:

Quote:

Guess what the only other manufacturer with a 68µF 400V 18mmD x 25mmL general purpose cap was???

Shocker · 05-23-2012, 05:25 AM

It appears to have provision for a 5V output as well. There is a second output on the transformer and an empty position for a second rectifier. Curiously, the 5V and 12V lines on the PCB are linked for 12V only. Come to think of it, I could probably modify the unit for dual outputs. Only real difficulty would be finding a second pi coil. The 12V rectifier is SB10100FCT.

There is a bit of discolouration of the PCB tracks on the primary side (the secondary looks fine), so maybe it was too hot for the cap. The switcher is a PFF6N60.

The dual-outputs feature would of course be used to power a HDD. This unit actually came with a HDD enclosure. When it wouldn't start up I cracked it open and used a different PSU.

**kc8adu** · 05-23-2012, 08:00 AM

or if in 120vac area use a 200-250v cap.
had one for my maha c777+2 give up.since i dont care about running from 220v i used 2 33@250 paralell.
close enough for gov work.

Rulycat · 05-23-2012, 11:56 AM

Quote:

Originally Posted by Shocker

I'll consider them. But guess who I was thinking of when I wrote:

Fukyoo?

Shocker · 05-23-2012, 11:58 AM

You got it!!!

MH series to be exact.

05-23-2012, 01:13 AM	#1
Shocker Badcaps Veteran Join Date: Dec 2011 City & State: Albany, Western Australia Line Voltage: 230VAC 50Hz Posts: 631	Goofy non-standard CrapXon I have an otherwise decent 12V 3A plugpack let down by craps. (Oh so familiar...) What's bugging me is not that the caps are crap, but that the primary cap is a custom-sized CapXon KW. It's 68µF 400V and 18mmD x 25mmL. It's bulging on top and leaking around the positive lead. The plugpack wouldn't start up, and I'm pretty sure this is to blame. A longer cap would be blocked by the fuse and inlet. The secondary caps are 2 x CapXon KF 1000µF 16V 10mm and 1 x Teapo SC 680µF 16V 8mm. None of them are bulged, but best to play it safe. There's also a Teapo SEK 100µF 25V 6.3mm near the transformer which I figure should be replaced with a low ESR cap. Anyway, the big cap is the main problem. Curiously, CapXon has the size mentioned in the KM series - yeah, like that's gonna help . I then looked at SamXon's KM series, but that didn't take me anywhere. Guess what the only other manufacturer with a 68µF 400V 18mmD x 25mmL general purpose cap was???

05-23-2012, 02:06 AM	#2
mockingbird Badcaps Veteran Join Date: Dec 2008 Posts: 3,026	Re: Goofy non-standard CrapXon Rubycon and Panasonic both show an 18x25mm part: http://www.newark.com/rubycon/450txw...ial/dp/39T8985 http://www.newark.com/panasonic/eeue...ial/dp/39P9916 __________________ ...Their plight, in fact is even worse, they don't realize that they're cantonists, they think they're free men. What a slavery that is - to confuse slavery for light, and bitter darkness for bright light. -Rabbi Menachem Mendel Schneersohn

05-23-2012, 05:25 AM	#4
Shocker Badcaps Veteran Join Date: Dec 2011 City & State: Albany, Western Australia Line Voltage: 230VAC 50Hz Posts: 631	Re: Goofy non-standard CrapXon It appears to have provision for a 5V output as well. There is a second output on the transformer and an empty position for a second rectifier. Curiously, the 5V and 12V lines on the PCB are linked for 12V only. Come to think of it, I could probably modify the unit for dual outputs. Only real difficulty would be finding a second pi coil. The 12V rectifier is SB10100FCT. There is a bit of discolouration of the PCB tracks on the primary side (the secondary looks fine), so maybe it was too hot for the cap. The switcher is a PFF6N60. The dual-outputs feature would of course be used to power a HDD. This unit actually came with a HDD enclosure. When it wouldn't start up I cracked it open and used a different PSU.

05-23-2012, 08:00 AM	#5
kc8adu Super Moderator Join Date: Nov 2003 City & State: dayton ohio Posts: 6,437	Re: Goofy non-standard CrapXon or if in 120vac area use a 200-250v cap. had one for my maha c777+2 give up.since i dont care about running from 220v i used 2 33@250 paralell. close enough for gov work.

05-23-2012, 11:58 AM	#7
Shocker Badcaps Veteran Join Date: Dec 2011 City & State: Albany, Western Australia Line Voltage: 230VAC 50Hz Posts: 631	Re: Goofy non-standard CrapXon You got it!!! MH series to be exact.

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