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retrobecanes

Capacitor list for SE/30 analog board

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Those are for the power supplies.  For the analog board, I just finished a recap.  Here's the parts I used from digikey.

Please note, C15 (3.9uF 35V bipolar) is no longer available.  There are some on eBay, but I don't really trust capacitors from eBay.  So, I used a high frequency switching film capacitor, which should work well other than the different shape.

 

I've been happy with the results.  I'm not sure if all SE and SE/30 analog boards are the same, so please check the list against your board before ordering.  I also completed a recap of a Sony power supply.  I can include that list as well if you want it.

 

EDIT:  I also wanted to add, you can slide the corner of a piece of paper under the existing capacitors to see if they are leaking.  If the paper comes out discolored, you'd best get to recapping ASAP.    If not, then maybe not as important, although they can fail with no external cues.

Edited by joethezombie

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Those are for the power supplies.  For the analog board, I just finished a recap.  Here's the parts I used from digikey.

Please note, C15 (3.9uF 35V bipolar) is no longer available.  There are some on eBay, but I don't really trust capacitors from eBay.  So, I used a high frequency switching film capacitor, which should work well other than the different shape.

 

This is super useful, thanks! I'm sure I'll be having to do this myself soon...

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Quick update: I did the analog board recap this weekend based on JoeTheZombie cap list and it worked out great.  The analog board now works like a new one.  The wiggly screen and intermittent passing band have vanished.  Thanks again!

Edited by retrobecanes

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On 1/23/2017 at 6:19 AM, joethezombie said:

For the analog board, I just finished a recap.  Here's the parts I used from digikey.

Looks good, except perhaps for the 2 axial caps.  Those are the only 2 in your list of replacement Nichicons that have a 2000h@85°C rating.  All the radial caps have a 105°C rating, and rated at many more hours too.  Vishay is more expensive but is perhaps a better alternative for the axials.  Compare specs:

 

Nichicon 22uF 50V +/-20% axial, 2000h@85°C:

https://www.digikey.com/scripts/DkSearch/dksus.dll?Detail&itemSeq=262440786&uq=636633304796196373

 

Vishay 22uF 50V +/-20% axial, 2000h@105°C

https://www.digikey.com/product-detail/en/vishay-bc-components/MAL213831229E3/4237PHCT-ND/263350

 

and

 

Nichicon 33uF 25V +/-20% axial, 2000h@85°C:

https://www.digikey.com/scripts/DkSearch/dksus.dll?Detail&itemSeq=262446953&uq=636633364314617855

 

Vishay 50V +/-20% axial, 2000h@105°C (sadly Digikey doesn't have this p/n, but Mouser does):

https://www.mouser.jp/ProductDetail/Vishay-Sprague/30D336M050CB2A?qs=%2fha2pyFadui9Y6APtT5pVVUD0UrcKfUoYxrZNQfMzjq%2fWw0d7nWWm6O0oSh4AGdP

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Yes, the axials, DigiKey did not have exact replacements.  I chose the best they had at the time.  Interesting to see they’ve added the Vishay you found.  But regardless, if your analog board is reaching 85C where the axials are located, you’ve got bigger problems than capacitors. 

 

I’m unfamiliar with Mouser’s product catalog.  I wonder if they have a better C15 replacement.  The film capacitor I used has the wrong lead spacing, so the legs need creative bending.

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11 hours ago, joethezombie said:

...if your analog board is reaching 85C where the axials are located, you’ve got bigger problems than capacitors. 

When choosing fluid-filled electrolytic capacitors, it's not a matter of our vintage Macs running constantly at a toasty 85°C.  It's all about how to chose a replacement cap so it will have a long life.  

 

Most likely our compact Macs will run at 40°C or so inside, even with the fan, and especially so on hot days.  Depending on the ambient temperature of your room and whether there's a spinning platter HDD inside, the inside might even reach 50°C and even hotter if outside sunlight hits the housing for a long time.  Of course, the inside won't hit 85°C unless something is seriously wrong; but again, we are not picking replacement electrolytic caps based on our "expected operating temperature."  

 

The temp spec of these caps combined with the hour spec tells us something about how long that cap will last (in terms of years) when used at significantly lower temperatures.  For example, a cap spec'd at "2000h@85°C" will have a shorter life when used at 40°C than a cap spec'd at "2000h@105°C" when also used at 40°C.  Indeed, the cap longevity difference in terms of "hours" can and often is on order of 10x different.  Not all manufactures make this clear though.  Some will say, "multiple the specified Hours by 10 for every 20°C drop in operating temperature, with the total capacitor life not to exceed 20 years."  I can't find that info for these Nichicons and Vishays we're talking about, but if that holds true for them, we would have 2000h x 10 = 20,000h@"spec-temp minus 20°C" and 20,000h x 10 = 200,000h@"spec-temp minus 40°C" and so on.  Divide the hours by 24 to get days, then divide that result by 365 to get years, and remember that these caps won't function properly beyond 20 years.

 

I’m unfamiliar with Mouser’s product catalog.  I wonder if they have a better C15 replacement.  The film capacitor I used has the wrong lead spacing, so the legs need creative bending.

Below is a list of film caps at Mouser, which include the Panasonic cap you selected, all PP and rated at the same 3.9uF capacitance, 5% tolerance, and 105°C rating.  Lead spacing varies by part and I haven't opened my SE/30 to see what the lead spacing should be, but perhaps you would know?

 

https://www.mouser.jp/Passive-Components/Capacitors/Film-Capacitors/_/N-9x371?P=1z0wpzmZ1z0z7l5Z1z0x6frZ1yzs9nvZ1z0vhz5Z1yznbzs

Edited by JDW

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Thanks for your detailed explanation.  When researching this, I read that these ratings are not lifespans, rather abuse tests.  The manufacturer runs the part (for example) at 85C for 2000h continuous hours, then allows a cool down, and a final test on the capacitor to see if it still performs to the specifications.  I'm also curious if the computed longevity compares continuous use vs. idle time.   But it is good to know there is a source (Mouser) for 105C parts.

 

Lead spacing for C15 is 8mm.

 

 

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4 minutes ago, joethezombie said:

When researching this, I read that these ratings are not lifespans, rather abuse tests...  I'm also curious if the computed longevity compares continuous use vs. idle time...

 

Lead spacing for C15 is 8mm.

Even though that data is taken from manufacturer testing, the manufacturer has a way to compute longevity from that data, as I described in my previous post.  It's just that I cannot find anything online that tells us precisely how Nichicon and Vishay compute longevity for the caps we are talking about.  But manufacturers of other electrolytic capacitors do post such information in datasheets, and in many cases it is a "10x multiplier of hours" for every 20°C drop in operating temperature, which is why I use that as a good rule of thumb.

 

The film caps in my Mouser list with the narrowest Lead Spacing is the film cap you choose, which is 12.5mm instead of the needed 8mm.  But as you said, if you bend the leads they will reach to fit the narrower spacing.

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1 hour ago, JDW said:

 

 

Below is a list of film caps at Mouser, which include the Panasonic cap you selected, all PP and rated at the same 3.9uF capacitance, 5% tolerance, and 105°C rating.  Lead spacing varies by part and I haven't opened my SE/30 to see what the lead spacing should be, but perhaps you would know?

 

I was replying to the lead spacing for C15 and just noticed Joe already replied.  Pretend this message doesn't exist.

 

Edited by superjer2000

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