Re: Pet64 DOA

Sorry maybe I should have tested the some lines using AC not DC.

So here again is what I believe I have (suing the black line as GND):

White: - 5.8 vac
(KEY)
White - 0.5 vac
Black (I'm guessing this is ground)
Red - 4.98 vdc

Of course I could just be confused as I've never owned a C64 before.

Looking at schematics seems maybe the two white lines could/should be  
9vac, and maybe the red line should be 5 vdc???

Phil


On Dec 9, 2010, at 11:16 AM, Philip Lord wrote:

> I just got myself a PET64 from Yahoo Auction Japan. Quite a rare  
> machine I hear, so I'm not sure how one ended up in Japan. I got if  
> for a decent price as I don't think the Japanese knew exactly what  
> it was.
>
> Anyway, It arrived the other day, after a quick internal inspection,  
> I powered it on. I can hear the transformer buzzing(!), but no  
> action at all on the screen at all, and it doesn't seem like the  
> chips are getting warm at all Maybe need to leave it on a little  
> longer to make sure, but I didn't want to do that incase bad  
> voltages kill anything more).
>
> There are 4 wires leading from the small PCB which is attached to  
> the transformer to the C64 motherboard, and I have measured the  
> voltage from the black wire (GND?) to the 3 others. Here are the  
> reading i get:
>
> White: - 100mv
> (KEY)
> White - 100mv
> Black (I'm guessing this is ground)
> Red - 4.98v
>
> That's as far as I have gotten. Next I will remove the motherboard  
> and see where exactly these 4 wires go.
> Anyway, I was just wondering if anyone had any insights or thoughts.
>
> Cheers
> Phil


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