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Mike Chaney's Tech Corner > Mike's Software > Qimage Ultimate > UNCLOG? PK Black or MK black
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Author Topic: UNCLOG? PK Black or MK black  (Read 9041 times)
Fred A
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« on: May 26, 2015, 03:23:36 PM »
                                                                           I just realized!!   I have 2 black inks!!

The unclogger is set to unclog my cartridges, but what about the two black ink cartridges?

Since we set the paper type to plain (no gloss) copy paper, the driver will select the MK black and that will unclog.

See the video and find out how easy it is to make both inks work.

https://youtu.be/AaFI53m5lCQ

The video should change to HD quality a few seconds after it starts.

Fred
 
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Winfried
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« Reply #1 on: May 27, 2015, 05:51:33 PM »
Thanks for the hint that it is possible to have more than one settings for the unclog-procedure.
The kind of black ink depends on the choosen paper.
But I have a slight problem  Grin with my Epson 4990.
Switching from one black ink to the other enforces a cleaning cycle, that spoils about 1.5 ml of ink to the garbage.
So if I do the unclog for both inks it is quite pricy.
Therefor I do this unclog-procedure molstly just for one of the blacks

Winfried
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Fred A
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« Reply #2 on: May 27, 2015, 08:27:59 PM »
Quote
Switching from one black ink to the other enforces a cleaning cycle, that spoils about 1.5 ml of ink to the garbage.
So if I do the unclog for both inks it is quite pricy.

Winifred,
The cartridge hold 200 ml of ink.
If the 4990 uses 1.5 ml to purge when changing black inks, I think that's 3/4 of 1 %...
Not enough to take a second mortgage on the house. Wink 
Fred
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efikim
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« Reply #3 on: May 28, 2015, 10:13:10 AM »
Surely clogs are mostly in the printing head, not the cartridge or tubes. There's only one black printing head (that's why you have to swap the inks) so unclogging the head should usually clear for both the black inks?
 Huh?
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Fred A
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« Reply #4 on: May 28, 2015, 10:17:36 AM »
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Surely clogs are mostly in the printing head, not the cartridge or tubes. There's only one black printing head (that's why you have to swap the inks) so unclogging the head should usually clear for both the black inks?

Thanks Mike,
I didn't  think of it that way. Makes perfect sense.

fred
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admin
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« Reply #5 on: May 29, 2015, 02:36:46 PM »
Quote from: efikim on May 28, 2015, 10:13:10 AM
Surely clogs are mostly in the printing head, not the cartridge or tubes. There's only one black printing head (that's why you have to swap the inks) so unclogging the head should usually clear for both the black inks?
 Huh?

True.  As long as you are "working" all the inks currently installed, it'll keep the head clean.  On my R1900, it has both MK and PK inks installed all the time but exercising both requires one unclog pattern printed on glossy paper type (in the driver) and one with plain or matte paper set in the driver.  So I created two setups: one setup using glossy paper and the other type plain paper.  I added both of those setups to my scheduled unclogs and it prints a half page pattern of both: one with the PK ink and one with the MK ink.  When I get a few sheets in the tray, I just turn them upside down and feed the same sheets back in a second time, saving paper.  My R1900 is a CIS printer and the ink viscosity is a little different from the Epson inks so it clogs if it doesn't print something every day.  The magenta and yellow are particularly problematic so I've "tuned" my unclog patterns accordingly.  The first sheet is a half page of all 8 colors that the R1900 uses with the driver set to glossy paper (uses PK black).  The second sheet runs a half page of magenta, yellow, and black but is set to plain paper so it exercises the MK black and gives a little extra to magenta and yellow as those need it.  Works perfectly.  I haven't had a clog since I started this daily schedule.

Mike
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Jeff
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« Reply #6 on: May 30, 2015, 07:29:18 AM »
Thanks for those comments, the magenta is the first colour that starts to clog on my R1900.  it starts to show problems after 4 days even running Unclog daily.

Funny thing is that running a head clean to clear the magenta often results in ALL colour failing, this clears after another head clean.  Funny I know.  I think it is air in system rather than head clogging.

Carrying on testing.

Jeff

 
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davidh
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« Reply #7 on: May 31, 2015, 11:17:25 PM »
Quote from: Jeff on May 30, 2015, 07:29:18 AM
Funny I know.  I think it is air in system rather than head clogging.
Jeff
You are absolutely correct Jeff. After printing on both a Epson 7900 and 9890 for the past 5 years,  I have surmised that  depending on the machine and usage, it can be caused by any one of a number of reasons.
 
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