On Thu, 8 Oct 2020 at 03:39, J.Witvliet--- via users < users@lists.fedoraproject.org> wrote:
> > Printer on UPS? > You gotta be joking. Computers and switches OK. > But printers will empty your batteries in moments. > High quality UPS's have surge-protected only outlets specifically for things like printers. This minimizes the electrical problems that can occur when connecting a printer cable to a printer on a different circuit. High quality UPS's have overload protection and will shutoff if the load is excessive without draining batteries, but I recall an incident where building power went out and one person thought it would be good time to make tea so plugged an electric kettle into a small desktop UPS, and another incident where cleaning staff were plugging a vacuum cleaner into UPS outlets. In the latter case the UPS could handle the load, but the log entries from the UPS were a puzzle. > > *From: *"Roger Heflin" <rogerhef...@gmail.com> > *Date:* Tuesday, 6 October 2020 at 19:03:01 > *To: *"Community support for Fedora users" <users@lists.fedoraproject.org> > *Subject:* Re: Slow down problem > > And on top of what George says, it might be best to make sure the > printer is on the same breaker/120Leg as the computer. > > If the computer is on a UPS and the printer is not then if possible > make sure the printer is plugged into the same outlet as the UPS. > Also note that I don't know which power system you are on, I am > familiar with the US hot/neutral/ground 3-prong plug which is supposed > to just work for this, but there are a number of mis-wirings (of both > the outlet and the device) that are common enough to not be unlikely. > In the US there are simple <$10 devices (most hardware stores) that > plug into outlets and light up and tell you if the outlets are wired > correctly. > > Weird ground issues produce really odd behavior. If everything > involved is using a proper ground outlet and the outlets are properly > ground and all of the devices are properly wired then you should not > have a weird ground issue, which is what this sounds like, and was why > Geroge mentions running a wire to make sure the ground is right. If > you have a multimeter you could check resistance between a metal part > on the printer and a metal part on the computer without the printer > cable attached, if everything is right the resistance should be almost > 0, if the resistance is not almost zero then something really is wired > wrong. If the resistance is non-zero then there is a decent chance > that the ground on one device vs the other could be a few volts > difference (you can also check that with the meter, but it may or may > not be different enough at the moment), with a small amount it will > think there is a signal when there is not, and with a larger > difference any electronics (the parallel port card) may burn because > there is current flowing were it is not designed to flow. > > On Tue, Oct 6, 2020 at 10:46 AM George N. White III <gnw...@gmail.com> > wrote: > > > > On Tue, 6 Oct 2020 at 03:03, ToddAndMargo via users < > users@lists.fedoraproject.org> wrote: > >> > >> On 2020-10-05 19:20, Tim via users wrote: > >> > On Mon, 2020-10-05 at 17:15 -0700, ToddAndMargo via users wrote: > >> >> I think I am going to replace the parallel port card > >> >> "just because" > >> > > >> > If your parallel port is on a card, then simply removing the card > ought > >> > to show whether *it* is the problem. > >> > > >> > Peripherals are a prime area of hardware failure. When you have two > >> > mains powered devices hooked together, and one or more of them isn't > >> > earthed, or you connect them together while the equipment is on, it's > >> > very easy to zap components. They mayn't die instantly, but can be > >> > weakened. > >> > > >> > Peripherals connected between buildings, or even between rooms, also > >> > suffer the same kind of risk. > >> > >> It decides when to poop out. It is not all > >> that easy to reproduce. > >> > >> Basically, it poops out when I need it the most. > > > > > > Run a wire (at least 18 gauge) from the chassis of the PC to the chassis > of the printer. > > This should greatly reduce the chances for the parallel port getting > zapped. You might > > also think about using a more modern interface, with USB to parallel > converter or adding > > a network interface to the printer and disposing of the parallel port. > > > > > > -- > > George N. White III > > > > _______________________________________________ > > users mailing list -- users@lists.fedoraproject.org > > To unsubscribe send an email to users-le...@lists.fedoraproject.org > > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > > List Archives: > https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org > _______________________________________________ > users mailing list -- users@lists.fedoraproject.org > To unsubscribe send an email to users-le...@lists.fedoraproject.org > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org > > Dit bericht kan informatie bevatten die niet voor u is bestemd. Indien u > niet de geadresseerde bent of dit bericht abusievelijk aan u is > toegezonden, wordt u verzocht dat aan de afzender te melden en het bericht > te verwijderen. De Staat aanvaardt geen aansprakelijkheid voor schade, van > welke aard ook, die verband houdt met risico's verbonden aan het > elektronisch verzenden van berichten. > > This message may contain information that is not intended for you. If you > are not the addressee or if this message was sent to you by mistake, you > are requested to inform the sender and delete the message. The State > accepts no liability for damage of any kind resulting from the risks > inherent in the electronic transmission of messages. > _______________________________________________ > users mailing list -- users@lists.fedoraproject.org > To unsubscribe send an email to users-le...@lists.fedoraproject.org > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org > -- George N. White III
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