Re: Pet64 DOA

From: MikeS <*dm561_at_torfree.net*> Date: Wed, 8 Dec 2010 22:31:18 -0500 Message-ID: <DBFE4DF8BFBC43588CECBF8EFD9B025B@vl420mt> · dm561_at_torfree.net

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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