Re: Here is the 1.8 amp Lisa Power supply schematic

>> If anyone does find a schematic for this power supply, please let us all
>> know, I suspect many of us care.
>
>I've posted the 1.8A supply schematic:
>
>http://www.speakeasy.org/~jlewczyk/lisaSchematics/LisaPowerSupply.gif
>
>I can tell its the 1.8A because it has taps on the main transformer for
>changing AC voltage.

Thanks, but I don't think that is the 1.8 Amp power supply, at least not the common one with the DataPower label on it.

The 1.2 Amp power supply I am looking at appears to have taps for 240 volts, but they are not labelled as such. I suspect Apple built the 1.2 Amp model in two versions, one for North America, and a dual voltage model for international sale with minor changes.

Dafax tried to find DataPower some time ago to get some information from them and see about making a new run of these power supplies... they are out of business.

Since switching power supplies have a lot in common, and often fail in the same way, any good repair shop that does switching power supplies all the time should be able to fix it. For example, Television and Computer Power supply repair shops can probably handle it, but you may need an above average one. Until we have a schematic for the 1.8 Amp version, providing the schematic of the 1.2 Amp power supply will be helpful so they can see the expected voltages and pinout. I think this is more practical than sending power supplies to the few people that have Lisa power supplies.

Perhaps we should devise a check-list for common problems so that any electronics enthusiast can give it a go?

HTH, James

James MacPhail                   "Think not of engineering as art,
uo957_at_email.domain.hidden                 but of art as engineering"
Sigma Seven Systems Ltd.
james_at_email.domain.hidden        <http://SigmaSevenSystems.com>

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