Re: hi res pic of 2001-8 power supply smoothing cap wiring

From: Bill Degnan <billdegnan_at_gmail.com>
Date: Thu, 7 Nov 2019 19:35:36 -0500
Message-ID: <CABGJBuc-VTvKhFjtqNsjUGrxNBNq2aJzH0+tJxCk=1nCq9DgMA_at_mail.gmail.com>
So, my 2001-8 is a later model with the blue front color.  I would like to
learn more detail about the pet model revs.  I did not think I had an early
2001-8, but I'd like to get one some time just cause they're a personal
fav..

Bill


On Thu, Nov 7, 2019, 6:46 PM Mike Stein <mhs.stein_at_gmail.com> wrote:

> If it's long enough I suppose they could have run a separate ground wire
> to the metal monitor case as they did on some of the later models.
>
> ----- Original Message -----
> *From:* Santo Nucifora <santo.nucifora_at_gmail.com>
> *To:* cbm-hackers_at_musoftware.de
> *Sent:* Thursday, November 07, 2019 6:28 PM
> *Subject:* Re: hi res pic of 2001-8 power supply smoothing cap wiring
>
>
>
> On Thu, Nov 7, 2019 at 6:11 PM Mike Stein <mhs.stein_at_gmail.com> wrote:
>
>> "I checked 8 2001-8s from 10051 to 41072 from 4 wire in the earliest to
>> 6 wires in the latest."
>> -------------------------------------------------
>>
>> Curious; any idea what the 6th wire is for? I've only seen 4 or 5 wires.
>>
>>
> Mystery solved for me.  The fourth black wire goes nowhere :)  This is a
> PET 2001-8 Professional computer at serial 41072 which is pretty late, i
> think.
>
>
> http://vintagecomputer.ca/wp-content/uploads/2019/11/Pet-2001-PS-wiring-03.jpg
>
>
>
>
>> It's pretty straight forward; the two brown wires (transformer terminals
>> 4 & 6) are the 16V AC or so that go to J8 pins 1 and 5; terminal 5 (centre
>> tap and ground) on the transformer goes to the negative cap terminal and
>> from there to pin 3 and also optionally to chassis ground (all black).
>>
>> Pin 4 is rectified unfiltered 8V DC from the PC board and goes to the
>> positive cap terminal and from there back to the board filtered on pin 2,
>> both red. Accessory boards with on-board regulation often connect here.
>>
>> Note that the plug J8 can plug in either way.
>>
>> Keep the J8 pins clean; it is notorious for overheating and burning the
>> pcb if it gets some oxidation etc. that increases contact resistance.
>>
>> m
>>
>>
>> ----- Original Message -----
>> *From:* Santo Nucifora <santo.nucifora_at_gmail.com>
>> *To:* cbm-hackers_at_musoftware.de
>> *Sent:* Thursday, November 07, 2019 4:50 PM
>> *Subject:* Re: hi res pic of 2001-8 power supply smoothing cap wiring
>>
>> I checked 8 2001-8s from 10051 to 41072 from 4 wire in the earliest to 6
>> wires in the latest.  I can confirm all blacks are on one terminal and all
>> reds on the other.
>>
>>
>> On Thu, Nov 7, 2019 at 4:42 PM Bill Degnan <billdegnan_at_gmail.com> wrote:
>>
>>> http://vintagecomputer.net/commodore/2001-8/2001-8_sn20343.jpg
>>>
>>> 20343
>>>
>>> I too have black wire(s) on the filter cap as you describe coming around
>>> from an unseen origin.  Is it as simple as all of the red so on one side,
>>> black on the negative? I am looking through what I have for the schematics
>>> for this model, until then I am just guessing.
>>>
>>> Bill
>>>
>>> On Thu, Nov 7, 2019 at 4:36 PM Santo Nucifora <santo.nucifora_at_gmail.com>
>>> wrote:
>>>
>>>> I also have another model of 2001-8 that has an extra black wire
>>>> clustered with the other black wires on the filter cap.  It goes to the
>>>> power socket under the transformer so I can't see where it goes but I would
>>>> assume the negative terminal?
>>>>
>>>> What is your serial number range?  The one I took pics of was 100895 so
>>>> that one is kinda early.
>>>>
>>>>
>>>> On Thu, Nov 7, 2019 at 4:27 PM Bill Degnan <billdegnan_at_gmail.com>
>>>> wrote:
>>>>
>>>>> Unfortunately I don't think we have the same model, here is what I
>>>>> have not mine but same transformer)
>>>>> http://www.8bit-homecomputermuseum.at/repair/bluepet/bluepet.html
>>>>>
>>>>> Bill
>>>>>
>>>>> On Thu, Nov 7, 2019 at 4:18 PM Bill Degnan <billdegnan_at_gmail.com>
>>>>> wrote:
>>>>>
>>>>>>
>>>>>>
>>>>>> On Thu, Nov 7, 2019 at 3:46 PM Ville Laustela <
>>>>>> ville.laustela_at_gmail.com> wrote:
>>>>>>
>>>>>>>
>>>>>>> Here are two crops from my old photos, perhaps these are of some use:
>>>>>>> https://postimg.cc/VSR5yLqp
>>>>>>> https://postimg.cc/GHW4Gf37
>>>>>>>
>>>>>>> —
>>>>>>> Ville
>>>>>>>
>>>>>>>
>>>>>> These photos are from a newer model, but thanks anyway.
>>>>>> Bill
>>>>>>
>>>>>
Received on 2020-05-29 23:34:12

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