QTR-Quadtone RIP

What am I doing wrong? Epson 9900. Trying to purge just one channel, LC position. Using QTR in calibration mode, but what file do I print, the QTR-LC flush.tif or the inkseperation.psd? Tried both, when using the QTR-LC flush, get no ink on paper at all. But doing a nozzle check I see mostly good nozzles for LC. If I use the inkseperation.psd file I get all the channels to print. Trying to get printer to just print with LC channel to clear up a stubborn clog.

Thanks, Mark

Instead of relying on special files and the calibration mode I make special profiles and use the 21 step wedge file to print. For example make a profle where the LC channel is the grey ink and all others are not used. ..set limit to 100...a preview of the curve should be a straight diagonal from 0-100 using just the LC. I then print the printer nozzle check to see progress. ..and repeat as necessary. Of course if you really want to purge you could use an image of a solid black square. I hope I explained this ok...I'm assuming you are familiar with the curve tool, and I'm using Win 10 with QTR GUI.
Greg.

Just a reminder from the link below:

This is not the recommended procedure for trying to unclog a printer.

Also, you don’t want to print a purge sheet if a single nozzle is out. It could permanently damage that nozzle.

best,
Walker

> On Feb 16, 2016, at 12:53 AM, brian_downunda@...m [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:
> 
> Both methods - calibration mode and a custom curve using only that channel - should work.  I've used both.  Like Michael I use the calibration mode approach.  If you're getting something on LC in a nozzle check but nothing by printing a LC (R,G,B) (247,0,255) purge pattern in calibration mode then something can't be right about how you're printing the purge pattern.  I suggest you use the files and instructions from here:
> 
> http://www.inkjetmall.com/tech/content.php?166-Flush-individual-channel-using-QTR-Calibration-Mode <http://www.inkjetmall.com/tech/content.php?166-Flush-individual-channel-using-QTR-Calibration-Mode>
>  
> see also 
> 
> http://www.inkjetmall.com/tech/content.php?144-Print-Ink-Separation-Image-thru-QTR-Calibration-Mode <http://www.inkjetmall.com/tech/content.php?144-Print-Ink-Separation-Image-thru-QTR-Calibration-Mode>
>  
> 
>

Walker (or Dana) is in a much better position to answer this, I know, but I wanted to share what I heard about these piezoelectric elements.

If I understand it correctly, when electricity is applied to these elements, they cause a micromovement that propels ink through the nozzle.  During a head clean, this piezoelectric element is vibrated at a much greater rate creating a significant amount of heat.  As long as this frees up a clog, ink can flow which has a cooling effect on the element.  That, I understand, is the reason Epson doesn't recommend more than a couple of head cleans.  (I don't knwo what a power clean does, specifically.)  Printing oen colour to will cause the element to vibrate also, but not as much as the cleaning mode, so it won't be as damaging.  But heat is still produced by the actions of the piezoelement, and if there's air in there, air has a much lower cooling effect than flowing ink.

Obviously Walker and Dana have much more knowledge in this matter, and perhaps I should have waited for Walker to answer.  Unfortunately, one of the problems of having the flu is that I'm sitting around bored looking for things to do.

Larry
--------------------------------------------
On Tue, 2/16/16, brian_downunda@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:

 Subject: Re: [QuadtoneRIP] Purging/flushing just one color channel
 To: QuadtoneRIP@yahoogroups.com
 Received: Tuesday, February 16, 2016, 3:01 PM
 
 
  
 
 
 
   
 
 
     
       
       
       Notwithstanding the text in red, not every nozzle
 gap is a clog.  It can be air, especially on desktop
 printers (noting that the OP has a 9900), and I have found
 purge patterns to be a more effective way of dealing with
 air.  In such situations I have often found head cleans to
 make matters worse.  If it is a genuine clog, then sooner
 or later a head clean will probably be required.
 
 Do you have a reference or
 source for the comment that printing with a single missing
 nozzle?  It's never happened here.  In fact on the IJM
 forum, the comment has often been made that a single missing
 nozzle generally won't been seen in a print, so print
 away and the nozzle may clear itself.  Which is certainly
 my experience.  
 
 
 ---In QuadtoneRIP@yahoogroups.com,
 <forums@...> wrote :
 
 Just
 a reminder from the link below:
 This is not the recommended procedure for trying
 to unclog a printer.
 Also, you don’t
 want to print a purge sheet if a single nozzle is out. It
 could permanently damage that nozzle.
 best,Walker
 
 
 
     
      
 
     
     
 
 
 
 #yiv5425850333 #yiv5425850333 --