Caple C871i Manual do Utilizador descarregar pdf (Página 398)

100

101

Apple II Computer Info

like it is too low or too high and/or you get frequent surges-- you may want

to get an UPS. Otherwise, the thin leads on your power supply could be

contributing to instability, over-currents, and failure.

You mention finding a "nice crunchy ceramic cap". Are you sure it was a

cap?

A common failure point on Apple II supplies is a capacitor-looking thing

called a "globar". It is a disc-shaped resistance element which is in series

with the AC line input. When power is turned ON, the globar is cold and has a

resistance of, very roughly, 50 Ohms. A second or so after turn-ON, it has

heated up and its resistance drops to just a few Ohms. The idea is to limit

initial surge voltages.

A globar can fail quickly-- a lead pops off or the element cracks and

separates; either way, the AC input line is broken and everything stops cold.

Or, a globar may fail slowly-- a lead connection fractures or the element

develops cracks but does not separate. A slow-failing globar could produce

the audio noise you mention.

Anyway, try beefing-up the +5V, +12V, and one GND lead to #10 or #12

gauge. This may help save your present power supply.

Rubywand

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Apple II Computer Technical Information : Apple II Family Hardware Info

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