Re: Print black only with HP printer

> How does any of that information answer the OPS question about magenta being
> needed to print black?
>


I'm afraid this is a printer newsgroup, not one for remedial reading and language skills. I am sure there are such newsgroups somewhere on line.

Perhaps if you were to read each word more s-l-o-w-l-y you might actually absorb the content better.


Cole's Notes version (for those who have difficulty with bigger words):

In another posting, it was explained to the original poster that his printer used "permanent heads". Most HP printers use thermal head design.

The complete second paragraph I've written explains the mechanics of a thermal head and that those printers with "permanent" heads shut down if any ink color runs out to protect the head from burn out, and dry out.

If there are other parts of my posting you still don't understand, I can try to explain them using less and/or smaller words.

Art


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Jerry wrote:
I have an HP photo printer and have been very pleased with it. I like
the ability to just change individual colors.
I think HP "accidentally" forgot to write in the program to just print
Black when that cartridge
has plenty of ink.
I have one cartridge that is out of color and it thinks that Magenta
is necessary to print black.:-)
Any workarounds ?
Thanks.

"Arthur Entlich" <e-printerhelp@xxxxxxxx> wrote in message news:euBdl.119200$ln7.103188@xxxxxxxxxxxxxxx
Just to add a bit about permanent or semi-permanent ink heads.

There are two basic designs in inkjet heads, thermal and piezo electric.

Thermal heads actually use heat the ink in each nozzle to around boiling so that stream develops in the ink and that steam pushes a drop of ink out of the end of the nozzle. These head designs vary from ones integrated into the cartridge (made for one time use, although some people successfully refill these cartridges numerous times before the head fails) to more robust ones which are separate from the ink cartridge and may last up to 10 or more ink cartridge installations.

Thermal heads of either type (one time or permanent) cannot tolerate being activated for printing without ink in them for long or they will get overheated and melt or otherwise become damaged (burn out). Therefore they require ink flow to protect them from damage. As such, in the case of a permanent head design, if the ink cartridge runs dry, the printer shuts down to prevent the head from being damaged. Also,, even if the head wasn't activated in a printing scenario, it may still dry out and clog due to not having ink in the cartridge.

With the "one fill" heads integrated into the cartridge, the assumption is you will be tossing it and replacing it so it doesn't matter if it burns out or clogs from drying.

Piezo electric heads are different as, although they are usually permanent, they do not heat up to any great extent, as the mechanism to move the ink is mechanical using an electrical pulse to change the dimensions of a small pump to cause it to expel ink out of a nozzle.

Although these heads can also dry out and clog, they are less likely to get damaged from running without ink in them.

Art

How does any of that information answer the OPS question about magenta being needed to print black?


.

Relevant Pages

  • Re: Print black only with HP printer
    ... I have one cartridge that is out of color and it thinks that Magenta ... There are two basic designs in inkjet heads, ... Thermal heads actually use heat the ink in each nozzle to around boiling ... require ink flow to protect them from damage. ...
    (comp.periphs.printers)
  • Re: Print black only with HP printer
    ... There are two basic designs in inkjet heads, ... Thermal heads actually use heat the ink in each nozzle to around boiling ... cartridge and may last up to 10 or more ink cartridge installations. ... Therefore they require ink flow to protect them from damage. ...
    (comp.periphs.printers)
  • Re: Print black only with HP printer
    ... There are two basic designs in inkjet heads, ... Thermal heads actually use heat the ink in each nozzle to around boiling so that stream develops in the ink and that steam pushes a drop of ink out of the end of the nozzle. ... These head designs vary from ones integrated into the cartridge to more robust ones which are separate from the ink cartridge and may last up to 10 or more ink cartridge installations. ... Thermal heads of either type (one time or permanent) cannot tolerate being activated for printing without ink in them for long or they will get overheated and melt or otherwise become damaged. ...
    (comp.periphs.printers)
  • Re: a tube came off my ink thing
    ... I am saying neither the cartridge nor the head "knows" if it is getting ink or not. ... Rather that sensor is designed to determin eth temperature of the ink to estimate the viscosity of the ink, and it makes adjusting in the frequencies the heads use to be more responsive and accurate in dot position and size. ... It is possible you recieved a defective cartridge, chip or something else is wrong. ...
    (comp.periphs.printers)
  • Re: Epson R1800 tips anyone?
    ... let it sit for weeks without use or the heads will clog & don't pull the ink cartridges out & put them back in or it resets them as full & if it runs on an empty cartridge, ... I was suggesting just the test pattern to use a small amount of ink on every single color but it'll be hard for me to remember to do this regularly, I sure hope clogging is less of a problem, my C80 had banding problems from day 1, I even got them to replace the first one, with this one, I did have to run the cleaning cycle once to get the first print to come out clear. ... I have printed my own business cards & folded brochures in the past, that card stock is not much heavier than heavy duty gloss photo paper. ...
    (comp.periphs.printers)
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