Search found 26 matches

by t-rexky
Mon Jun 05, 2017 7:47 pm
Forum: Apple
Topic: Trying to Resurrect a Macintosh Color Classic
Replies: 14
Views: 1293

Re: Trying to Resurrect a Macintosh Color Classic

If you look at Suns, NeXTs, SGIs of the same vintage... you'll find they haven't used any SMT electrolytics anywhere. That's why they "don't leak". Also absolutely not true. Please see my post above... All of my vintage equipment has been very carefully recapped with modern equivalent ele...
by t-rexky
Mon Jun 05, 2017 7:45 pm
Forum: Apple
Topic: Trying to Resurrect a Macintosh Color Classic
Replies: 14
Views: 1293

Re: Trying to Resurrect a Macintosh Color Classic

Apple seems to be the only company whose capacitors all leak. (It doesn't happen at all on NeXT computers, or Suns, or SGIs...) It seems they used a harsher post-solder cleaning regimen that was destructive to the rubber seals of the capacitors. There is no general problem with SMD capacitors leaki...
by t-rexky
Wed Apr 05, 2017 7:32 pm
Forum: HP/DEC/Compaq
Topic: Building stuff on my 9000/350
Replies: 7
Views: 509

Re: Building stuff on my 9000/350

Try the Misc forum next time. My post was in response to: I guess I should try bootstrapping an old gcc at some point. So I fully intended for it to go into this thread despite it being somewhat off-topic. It illustrates the ridiculous amount of time that modern gcc takes to bootstrap on vintage ha...
by t-rexky
Tue Apr 04, 2017 5:55 pm
Forum: Emulation
Topic: Previous 1.6
Replies: 0
Views: 307

Previous 1.6

For those interested, the Previous NeXT emulator has been just updated to version 1.6. Andreas keeps chipping away at it and it is now superbly usable!

http://www.nextcomputers.org/forums/viewtopic.php?p=23501#23501
by t-rexky
Tue Apr 04, 2017 5:48 pm
Forum: HP/DEC/Compaq
Topic: Building stuff on my 9000/350
Replies: 7
Views: 509

Re: Building stuff on my 9000/350

This is the absolutely wrong forum for this, but I have almost fully bootstrapped gcc-4.6 on NEXTSTEP 3.3. It takes somewhere around a week on my 33 MHz TurboColor for just C and C++...
by t-rexky
Sat Sep 05, 2015 3:58 am
Forum: Sun
Topic: SPARCstation 20 power supplies EOL
Replies: 19
Views: 2390

Re: SPARCstation 20 power supplies EOL

All switch-mode power supplies use similar fundamental topologies, but detailed implementations vary. The best thing I would suggest is contacting Fuji in an attempt to obtain the power supply schematic. It is a long shot, but being persistent helps and I was able to do this successfully for other p...
by t-rexky
Fri Sep 04, 2015 8:08 pm
Forum: Sun
Topic: SPARCstation 20 power supplies EOL
Replies: 19
Views: 2390

Re: SPARCstation 20 power supplies EOL

Have you used the capacitor models and part numbers from my list or just "any" capacitors of same capacity and voltage rating? In switching power supplies it is critical to use the correct low impedance capacitors in order for them to function correctly. When I put the replacement list tog...
by t-rexky
Thu Aug 07, 2014 10:26 pm
Forum: HP/DEC/Compaq
Topic: Troubleshooting HP 9000 Model 735 Power Supply
Replies: 4
Views: 897

Re: Troubleshooting HP 9000 Model 735 Power Supply

Thanks for the suggestion. All of the electrolytics have been already replaced as some of them leaked and started corroding the board...
by t-rexky
Mon Jul 21, 2014 9:32 pm
Forum: Sun
Topic: Sun WorkShop 5 non-expiring demo license?
Replies: 15
Views: 2333

Re: Sun WorkShop 5 non-expiring demo license?

Yes, I am still looking for the license since I was unable to locate it. Thank you.
by t-rexky
Mon Feb 10, 2014 4:21 am
Forum: Sun
Topic: SPARCstation 20 power supplies EOL
Replies: 19
Views: 2390

Re: SPARCstation 20 power supplies EOL

Indeed, and I had to do that for my "primary" machine. However, if the installed NVRAM is original and still carries the orange barcode sticker, the NVRAM content can be recreated from the sticker. A complete guide to reprogramming the NVRAM can be found at: http://www.squirrel.com/sun-nvr...
by t-rexky
Sat Feb 08, 2014 7:02 pm
Forum: Sun
Topic: SPARCstation 20 power supplies EOL
Replies: 19
Views: 2390

Re: SPARCstation 20 power supplies EOL

I finally put some photos together for my flickr account that illustrate the capacitor replacement. It should be enough to provide a rough guide and illustrate the scope of work:

http://www.flickr.com/photos/t-rexky/sets/72157640695991374/

Enjoy.
by t-rexky
Sun Jan 26, 2014 9:07 am
Forum: Sun
Topic: SPARCstation 20 power supplies EOL
Replies: 19
Views: 2390

Re: SPARCstation 20 power supplies EOL

It's my pleasure. I am attaching a PDF with a DigiKey parts list and with the original component details for the FDK PEX668-31 power supplies that my SPARCstations were equipped with. Note that some of the capacitors are installed on daughter boards and are either very difficult or impossible to rew...
by t-rexky
Sat Jan 25, 2014 7:42 am
Forum: Sun
Topic: SPARCstation 20 power supplies EOL
Replies: 19
Views: 2390

SPARCstation 20 power supplies EOL

I recently came across a number of SPARCstation 20 boxes and decided to restore a few of them to a "new" condition. I am quite impressed with the overall design and build quality of the units. However, when cleaning and inspecting the power supplies I discovered that some of the output fil...
by t-rexky
Sat Jan 25, 2014 7:30 am
Forum: Sun
Topic: Sun WorkShop 5 non-expiring demo license?
Replies: 15
Views: 2333

Sun WorkShop 5 non-expiring demo license?

Back in the day SUN has released non-expiring, any node, demo licenses for WorkShop 3 and WorkShop 5. The relevant page can still be found at: http://wayback-beta.archive.org/web/20080220024130/http://www.sun.com/software/licensingcenter/sundev.xml Unfortunately I am not able to find the referenced ...
by t-rexky
Sat Jan 04, 2014 9:12 am
Forum: HP/DEC/Compaq
Topic: Troubleshooting HP 9000 Model 735 Power Supply
Replies: 4
Views: 897

Re: Troubleshooting HP 9000 Model 735 Power Supply

Thanks for the encouragement! I tried to contact ASTEC again with a request for a schematic or service manual. I also started looking at the pinout and the circuit, but it will be a very slow process.

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