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Title: Looking to replace the capacitors on my first EIII rack's PSU Post by: rokuez on January 18, 2009, 05:24:05 PM Well I've gotten pretty good at soldering and de-soldering, capacitors specifically.
pic of my tech table / work area http://www.eiiiforum.com/picsfromusers/eiiipsu/IMG_0962.JPG I also got an old school de-soldering station, and have tested it out and used it. pic of my old school de-soldering pump http://www.eiiiforum.com/picsfromusers/eiiipsu/IMG_0963.JPG I have two EIII racks which aren't fully functional :( pics broken EIII racks sitting in closet http://www.eiiiforum.com/picsfromusers/eiiipsu/IMG_0931.JPG I'm looking to replace the capacitors in my first EIII rack (the one on the bottom) that had the problem with the chip popping out of their sockets. When I had this unit on I would hear these popping sounds, and I've deduced that it is from the caps on the PSU. I had opened up the EIII and I put my ear around listening for the noise and it was coming from the PSU area. Now I don't know a ton about electronics even though I'm learning. I can barely read the simplest schematics. 1. When I desolder the capacitors I know that I must replace them with caps of equal farads, but can I / should I replace them with caps of slightly higher voltages? For instance when I was doing recapping work, I would for example take out a cap with say 10 uF 25 V and replace it with a cap of 10 uF 50 V. 2. Any other warnings or suggestions? Has anyone else recapped their EIII PSU? From looking at the PSU I only see 13 caps. I plan on disconnecting all the molex connectors to the PSU , then unscrewing PCB board from the casing and removing it from the EIII rack casing. Once I have it removed I will replace the caps (any capacitor brand recommendations?) put it back in and then re-calibrate the PSU from the tutorial dvdborn posted http://eiiiforum.com/index.php?topic=8.0 Once I've removed the PSU I could scan the front and the back of the PSU if someone wants me too. I figure this might be a good idea considering the lack of info the PSU but i dunno if it's necessary. Title: Re: Looking to replace the capacitors on my first EIII rack's PSU Post by: Elmbeatz on January 23, 2009, 03:10:02 AM Unfortunately I haven't got experience in all that...
...but the image featuring your closet, the two EIIIs and the old school ADD one.... drool!! :D EDIT: You always did a good job on 'documenting' your work... post pictures of your work please (if possible)! Title: Re: Looking to replace the capacitors on my first EIII rack's PSU Post by: dr.c on April 18, 2009, 12:06:39 PM Why do you want to change the caps ?
Don't mess with the machines ! Title: Re: Looking to replace the capacitors on my first EIII rack's PSU Post by: rokuez on April 18, 2009, 12:14:02 PM Why do you want to change the caps ? Don't mess with the machines ! before i had calibrated the PSU i used to hear this popping sound. like an electrical popping sound. I figured it was caps about to go bad... now not so much. Won't the caps need replacing i.e re-capping in the future tho? EIII came out in like 1988 so sooner or later they will be going bad i imagine? |