E-mu Emulator Sampler User Forum for the EIII EII EI and EIII XP - Looking to replace the capacitors on my first EIII rack's PSU

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| | |-+  Looking to replace the capacitors on my first EIII rack's PSU
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Author Topic: Looking to replace the capacitors on my first EIII rack's PSU  (Read 4237 times)
rokuez
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« 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 Sad

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.

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Macbook Pro 2.6 Ghz, 2.3 intel cpu w/ RME Fireface 800 Mackie HR824 s, PC p4 2.3 180 gig hd, 2 gb ram, Emu 1212m adat out 2 the rme, M-Audio Midisport 2x2, & . Atari ST Notator SMPTE Tracker, Yamaha kx88 , E-mu Emulator II, 2 Emu Emulator III rack, Prophet 5 Rev2, Andromeda
Elmbeatz
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« Reply #1 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!!   Cheesy

EDIT:  You always did a good job on 'documenting' your work... post pictures of your work please (if possible)!
« Last Edit: January 23, 2009, 03:14:34 AM by Elmbeatz » Logged
dr.c
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« Reply #2 on: April 18, 2009, 12:06:39 PM »

Why do you want to change the caps ?

Don't mess with the machines !
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rokuez
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« Reply #3 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? 
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Macbook Pro 2.6 Ghz, 2.3 intel cpu w/ RME Fireface 800 Mackie HR824 s, PC p4 2.3 180 gig hd, 2 gb ram, Emu 1212m adat out 2 the rme, M-Audio Midisport 2x2, & . Atari ST Notator SMPTE Tracker, Yamaha kx88 , E-mu Emulator II, 2 Emu Emulator III rack, Prophet 5 Rev2, Andromeda
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E-mu Emulator Sampler User Forum for the EIII EII EI and EIII XP - Looking to replace the capacitors on my first EIII rack's PSU

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