Re: Pet64 DOA

Great...so then maybe my power voltages are all good? Should I find  
some test point on the C64 motherboard and get some voltages there?  
Any idea what I should check next?

Re-PET board. Ethan has been working very hard, and he believes he has  
fixed both boards now (but can not test loading as his C2N data  
cassette deck is in need of a new drive belt). Last I heard everything  
is almost packed up and ready to ship. It would be great to get the  
boards back before years end, as I have been building a number of add- 
ons in anticipation for their arrival and I'm excited to try  
everything out.
I have built one of Nicolas Welte's Ram/Rom boards which will  
hopefully take my ram to 32k and allow me to use various basics (V1  
through V4) and not have to worry about failing RAM in the future. I  
have also built a number of adaptor boards to replace the video ram  
and character ROM. Finally I got myself a C2N232 as I don't know how  
reliable the original cassette drive is. I'm hoping to 'fail proof'  
this machine for at least another 30 years ;-)




On Dec 9, 2010, at 1:44 PM, MikeS wrote:

> 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
>>>>     Message was sent through the cbm-hackers mailing list
>>>
>>>     Message was sent through the cbm-hackers mailing list
>>      Message was sent through the cbm-hackers mailing list
>
>      Message was sent through the cbm-hackers mailing list


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