Re: lisa 2 startup problems

Hello Alex,

well, the LisaList and mainly some members aren't keen on reading articles in a non-english language or better not beeing able to read them, so I'd better continue in English :-) Be careful by swapping the PSU, it's possible that the new working one will get damaged, too. That's not very likely, but possible... and that would lead to two damaged PSUs. As I'm only firm in repairing PSU's I cannot answer your question about the HDs, but I think, that shouldn't be a problem; it should work. But you can disconnect the HD, when starting the Lisa to locate where the error is caused. Not that a corrupted HD causes the break- down of +12V...
Getting back to the PSU. If you want to repair it yourself, just send me a note in case you'll need some help

greetings to Transilvania, a wonderful landscape... I did some tracking-tours there years ago

Am 20.12.2012 um 15:12 schrieb Alex:

> Hello Tom,
>
> You are right, somehow the +12V is missing, I only get +3,4V
> instead, I only measured +5V and -5V which are ok. I will first try
> to replace the PSU (a working Lisa should arrive today and I will
> try swapping the PSU from that one) and than repair it later.
> Do you know what the difference might be between a Sun
> Remarketing 30 MB hard drive and the original LISA hard drive? Can
> I simply swap them?
>
> Sometimes, I think we might as well speak German on lisalist :)
>
>
> Greetings from Kronstadt (Brasov), located in Transilvania, at 15
> minutes drive to Draculas castle :)
>
> Alex
>
>
>
> miercuri, 19 decembrie 2012, 08:32:05 UTC+2, tommoni a scris:
> Hello Alex,
>
> perhaps this could also be a problem with the power supply.
> If the output voltages are not correct, the psu automatically shuts
> off. I had the same problem a few years ago, when I received a psu
> from a collector in England to get it repaired again.
> So have you ever measured the 5 output voltages: permanent +5V
> standby, +5V, +12V and -5V, -12V. ?
> They're (with small tolerances) very important to get a Lisa fired up.
>
> The second error could be a permanet triggered ON/OFF safety
> interlock. In this case Lisa would not fire up or would only get
> power for less than a half second and only make a sound like
> "blip", when you push the power button.
>
> greetings TOM from Bavaria, the center of Europe, with the capital
> Munich and the origin "Octoberfest"
>
>
> Am 18.12.2012 um 21:47 schrieb Alex:
>
>> Hi everybody,
>>
>> long time no post.
>> I have done some more tests and come to the conclusion the card
>> edge connector for the IO board has to be changed. I waited 3
>> weeks for 3 connectors to arrive from Korea and today they finally
>> arrived. I have changed the one from the IO Board and all the
>> sockets and capacitors on the IO board but with little success.
>>
>> No when I press the power button, LISA turns on but only as long I
>> keep the button pressed, as I release it it will go off again.
>>
>> Any suggestions?
>> Thanks!
>>
>> joi, 15 noiembrie 2012, 01:17:32 UTC+2, PSchaefer a scris:
>> Am Mittwoch, 14. November 2012 20:25:07 UTC+1 schrieb Alex:
>>
>> On the card edge connector I measure also 0V on the /RESET pin.
>> this means the system is kept in reset state on the motherboard.
>>
>> There is an electrolytic capacitor (C8) next to the 68000 CPU.
>> Usually it gets leaky, then /Reset is stuck low.
>>
>> In case you don't have a replacement available, just cut it away.
>> Then you'll have to press the Reset button once to start the CPU
>> (after power-up)
>>
>>
>> Patrick
>>
>>
>>
>>
>>
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