Digital BW, The Print

At 04:46 PM 1/25/2005 +0000, you wrote:

>I'm having a strange problem. In the past, when I've had a clog on my
>7500 which would not go away I've replaced a few dampers which have
>solved the problem. I Just had a problem with the Black and Cyan
>positions. The black all of a sudden would get brakes in the pattern
>which would not go away. I ended up printing a black only Purge which
>got lighter and lighter until I could barely see a patern. I put in a
>damper and drew some ink into it with a syringe from the port which
>goes on the head nib. I then put the damper back on and printed a
>nozzle check, NOTHING. I did several cleaning cycles and tried again.
>Still nothing. I then went back in and replaced the damper on the
>Cyan thinking that I had replaced the wrong damper. I fired up the
>printer, did a cleaning cycle and then printed another check. Now the
>black did not show up and the cyan shows very little activity. I
>replaced the damper on the black and tried again. Still no activity
>in the black channel and little in the cyan. I've ordered a couple of
>more dampers and plan to start again. How much Ink does the head
>itself hold in each channel apart from the damper. what is wrong and
>how do I correct it. Please help.

I had a similar problem with my 7600. it required changing the cap 
assembly. If you are not getting a good seal around the o-ring then you 
won't get enough suction to pull the ink out of the dampers. It can also 
cause the ink in the heads to dry out and clog. You can first try to clean 
the o-ring with a Q-Tip soaked in distilled water. Also clean the rubber 
wiper blade since it can become encrusted with dried ink. If that doesn't 
work then there is a good chance you will have to replace the assembly.



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