Just to close out the original point of my thread...thanks. I was able to put in a replacement cap that was not leaky. Did not fix the screen ripple problem, but did fix at least the smoothing cap, which I did not even know was bad to begin with. Bill On Fri, Nov 8, 2019 at 7:28 AM Santo Nucifora <santo.nucifora_at_gmail.com> wrote: > My latest 2001-8 is 41072. It is labelled as a "Professional Computer" > but it has the green phosphor screen. I have one somewhere around 36000 > and it still has a white phosphor screen. All the rest of mine are white > phosphor. I don't see much difference between the "Personal Computer" and > "Professional Computer" other than the green screen. I wonder if that was > the only difference. I will have to check. > > All are mine including 41072 are denoted as "2001-8" models and all of > them have the chicklet keyboard. I didn't get into the full keyboard 2001s > because the variations are astounding and this doesn't even take into > account European models that may have differences as well. > > Serial number 10705 would have had a metal nameplate. Your original case > top would have had welded sides on the top half as opposed to later ones > were one-piece folded metal with the keyboard being a separate piece that > was welded on. To illustrate this, I linked a picture of 10051 below. If > you look at the top-right of the picture of the inside of the case, you can > see a thin metal strip between the top and side of the case. Your upgraded > case top would have been folded metal. There is also variations on how the > top and bottom sections were fastened. Earlier ones with screws, later > ones with rivets. I am sure 99% of the people don't care but I find the > evolution of this one model pretty interesting. > > Internals of Serial number 10051: > > http://vintagecomputer.ca/wp-content/uploads/2019/11/Pet-2001-8-10051-Internals.jpg > > > Santo > > On Thu, Nov 7, 2019 at 10:14 PM Mike Stein <mhs.stein_at_gmail.com> wrote: > >> So that's the last version with white phosphor? >> >> There were so many variations including upgrades that I doubt there will >> ever be a 100% reliable history. >> >> For instance, I upgraded my first one with a kit that replaced the upper >> case half with the 'real' keyboard, the CRT and the bezel and label, but of >> course still the same serial no. (10705); I wonder if any were shipped from >> the factory in that configuration or whether the new keyboard appeared at >> the same time as the dynamic RAM 2001-N. >> >> m >> >> ----- Original Message ----- >> >> *From:* Santo Nucifora <santo.nucifora_at_gmail.com> >> *To:* cbm-hackers_at_musoftware.de >> *Sent:* Thursday, November 07, 2019 9:54 PM >> *Subject:* Re: hi res pic of 2001-8 power supply smoothing cap wiring >> >> Bill's 2001-8 variation is the one most people usually think was the >> earliest model (or used to think so). This is 10051 with the Sanyo tape >> drive and the thick metal nameplate. It did go from black to blue to black >> front bezel. 10895 had the blue bezel but still had the thick metal name >> plate. It also had the Commodore tape drive by that point but a black >> label variation. >> >> >> http://vintagecomputer.ca/wp-content/uploads/2019/11/PET-2001-8-10051-front.jpg >> >> >> On Thu, Nov 7, 2019 at 9:36 PM Mike Stein <mhs.stein_at_gmail.com> wrote: >> >>> Odd; I always thought that they went from blue bezel (and white >>> phosphor) to black (and green); maybe they went black to blue and back to >>> black,,, >>> >>> >>> ----- Original Message ----- >>> *From:* Santo Nucifora <santo.nucifora_at_gmail.com> >>> *To:* cbm-hackers_at_musoftware.de >>> *Sent:* Thursday, November 07, 2019 9:09 PM >>> *Subject:* Re: hi res pic of 2001-8 power supply smoothing cap wiring >>> >>> All eight of my PET 2001-8s are different variations; some subtle, some >>> major but they all have a chicklet keyboard and a tape drive (except for >>> one that was modified to add an aftermarket keyboard but it's easily >>> reversed). I need to take some better pics to highlight the differences. >>> >>> My earliest PET 2001-8 is serial number 10051 (number 51) and this unit >>> is somewhat different from serial number 10171 which is not that far off. >>> Differences include a solder maskless motherboard, a different early analog >>> board in the monitor section and a folding "kickstand" in the earliest. >>> The later one has the normal kickstand we all know and love and the normal >>> early motherboard. From 10171 to 10895 PETs went from black bezel to blue >>> somewhere in that range. Anyway, it is on my list to document each of them >>> with pictures. >>> >>> They are definitely one of my personal favorites too. >>> >>> Santo >>> >>> >>> >>> On Thu, Nov 7, 2019 at 7:36 PM Bill Degnan <billdegnan_at_gmail.com> wrote: >>> >>>> 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 23:36:20
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