Re: Pet64 DOA

5V DC and 9V AC - sounds OK.

Did you finally get your PET boards back and working?

m

----- Original Message ----- 
From: "Philip Lord" <random6000@mac.com>
To: <cbm-hackers@musoftware.de>
Sent: Wednesday, December 08, 2010 10:41 PM
Subject: 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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>>
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> 
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