Re: Macintosh 6100 Power Supply

I just wanted to say that I successfully recapped my power supply with all the above values, using all Nichicon caps available at digikey.ca, and the computer never worked better. The built in video is crisp as the day the system shipped, and the system runs perfectly in every way. I didn't have to replace any of the high side input filter electrolytic or RIFA caps. I can't be happier - as I feel my "ultimate" 68k pizza box project is now complete! Total cost was $22 CAD, with one extra cap each as a spare in case I messed up my resoldering...

Re: Macintosh 6100 Power Supply

I always thought clouds were vapourware. When's the release date again?

Here is an update with sizing and the original cap's type/series. Also a correction: the 82uF is a 105C rated.

Now the part where I have absolutely no experience about: What precisely to buy to replace these. I guess off to digikey.ca and the reference here on what caps are nice!


[code]All dims in mm: Hgt. Dia. Ld.
Electrolytic 35V @ 85C Sp.
---------------------- --- --- ---
(2) 33uF (SME) 11...

Re: Macintosh 6100 Power Supply

Thanks Monkey King!

It seems that most of the caps on digikey.ca are non in stock. Typical! I'll have to get creative with the ordering and will work on it tonight.

Re: Macintosh 6100 Power Supply

That's right, I didn't bother doing that yet. It was late last night. I'll try and get back here soon and post it.

The original caps did not seem to be very notable, but I'm semi new at identifying them. The larger brown ones that were rated 105 degrees C were marked with KME and were otherwise plain. It seems these are UCC KME series based on a google image search. Since I'll be ordering new parts from mouser.ca, I'll likely order the same ones as they at first glace appear to be still available.

Re: Macintosh 6100 Power Supply

I pulled all the caps off the board last night. It was quite tricky, because they decided to manufacture it by bending the cap's leads quite far over and leave big tails, and solder them all down. It took a lot of heat to get a mini-screwdriver under each lead and bend it up straight, clip it off and remove the caps.

My board did not have any errors regarding the polarity of the Electrolytic caps. The silkscreen shows a +, and before soldering, they clearly had someone mark the (-) lead with a dashed line using a sharpie. If you use isopropyl...

Re: Macintosh 6100 Power Supply



Several machines share the exact same chassis and power supply. There is more than one power supply model design that share the same Apple part number.

Unlike other threads on Badcaps here, where these machines contain an ASTEC power supply, mine has this Dyna Comp Inc. unit instead.

Instead of it being multiple boards like the ASTEC, mine looks exactly like the single PCB power supply as pictured above, except I have all the original caps on mine and it is working....

Re: Macintosh 6100 Power Supply

I'm new here but have recapped a 660AV that this power supply powers. I've also fixed a bunch of other things kicking around the house with bad caps.

I know it's a year ago that you posted this but I have this exact power supply! The Dyna-comp DCF 803, not the ASTEC!

I need to recap it, I believe, to fix a very noisy video output on the system. I don't know if it will fix my noisy/fuzzy video, but I might as well give it a shot! My SGI Indy has the same problem - but that one has obviously bulging caps and so no wonder the...

Re: New Members - please post your introductions here

Hey all! New here, but not new to recapping boards. Have successfully recapped a few small power supplies for SCSI enclosures, a car battery charger and a Macintosh Quadra 660AV. Looking forward to learning more about recapping and circuit repair techniques from badcaps.net!