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 23:33:40
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