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Re: AppleColor Composite Caps



srkh28@gmail.com wrote:
Ive taken the chance to replace the caps in the my IIe's power supply.
There has always been the odd complaint (we'll actually a plethora of
complaints) about how the II's supply never having a fan. We'll after
28 years of service, the caps finally gave out - and because the
enclosure has no vents (or a stupid fan for that matter) the supply
inside looks as new as the day it was made - as clean as - a total
pleasure to work on. I dont know if anyone has worked on PC power
supplies 9or any supply wit a fan for that matter), but after a mere
few year in use, the fan sucks in is so much dust, grime and smokers
gooey tar, that you would rather work on a dead rat than a grubby
power supply.

Then there's the problem that the power supplies are clearly
much more reliable than any fan...

On May 26, 6:35 am, MdntTrain <j...@cimmeri.com> wrote:

  If I'm left with any question here, it's just over how effective is
ESR alone in checking caps?  It's certainly the easiest one to perform
if you have a meter.    But do we also need to be checking for
capacitance and leakage to get a true overall picture of the cap
health?   Or does high ESR tend to go hand-in-hand with leakage or
capac. loss?

Capacitance will be a problem if it drops below half the rated value.
ESR is a problem in bypass and power filtering applications.
Leakage is a serious issue in coupling applications.

-michael

NadaNet and AppleCrate II: parallel computing for Apple II computers!
Home page: http://home.comcast.net/~mjmahon

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