Re: Pet64 DOA

8.91 vac


On Dec 9, 2010, at 12:31 PM, MikeS wrote:

> Hi Philip!
>
> What AC voltage do you get between the two white wires?
>
> mike
>
> ----- Original Message ----- From: "Philip Lord" <random6000@mac.com>
> To: <cbm-hackers@musoftware.de>
> Sent: Wednesday, December 08, 2010 10:07 PM
> Subject: 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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