Re: lisa 2 startup problems

Hi,

Thanks for the information about the CPU board, I can now rule it out.

Just tried to checked the COP chip like you suggested by bending pin 24, the LISA turns on as soon as I connect the power supply, this being normal due to R42 (1kohm to +5V). And as many already told me, to turn it off the CPU must send the right signal. I will have to check the COP outside the system but there is no time now, late for work :). I will keep you posted with further details and questions :).

thank you,
Alex

miercuri, 7 noiembrie 2012, 02:05:12 UTC+2, James MacPhail a scris:
>
> >I just did a quick recheck of the COP chip.
> > ... the oscillator is working correctly. I suppose the COP chip is
> >dead although there might be other problems (interrupted traces) on
> >the motherboard and/or IO Board.
>
> Since the COP drives the oscillator circuit, it isn't completely
> dead, but I don't know if a bad COP always has a dead oscillator.
> Anyone else?
>
> If you isolate the COP power-on output pin (by bending it out so it
> doesn't enter the socket), you can check if it is trying to switch,
> suggesting there is another problem preventing power-on.
>
> >Does the Lisa power supply start without CPU board?
>
> I tested this moments ago, and yes, without a CPU board installed,
> pressing the power button does turn on the power.
>

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