Caple C871i Manual do Utilizador descarregar pdf (Página 386)

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Apple II Computer Info

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### Created : Wednesday, October 13, 1999 Modified: Wednesday, October 13, 1999

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Subject: Re: power supplies

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tb writes ...

> how can you tell if your power supply is bad?

....

Aside from a completely 'dead' machine, one quick indicator of a defunct

power supply may the absence of some sound-- like you hear no high-pitched

whine-- when power is turned ON.

Unusual sounds can indicate a short (you may hear clicks) or no-load from

a broken or bad connection (you may hear clicks and/or squealing). Before

declaring a power supply dead it's a good idea to check for things like a poor

power supply connector connection, a blown ON/OFF switch, and an AC line cord

which has developed a break.

One approach to checking is to measure voltages in the computer or

whatever is supposed to be powered by the power supply.

For example, in an Apple IIe, you could turn ON the computer and check

voltages across a few 74xxxx series IC's-- like a 74LS02, 74LS139, etc.. Your

Voltmeter's Positive lead would touch pin 14 (on 14-pin 74xxxx IC's) and

Negative would go to pin 7 (again, on 14-pin 74xxxx IC's). The reading should

be 5 Volts DC.

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 386 of 572

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