We bought our 9000s back in August 08. It had 25 heads replaced!!! :) Can i get to the Guiness book of records? It is still under warranty and still plauged with the same problem - nozzles dropping out during print. And it does it in a funny way - starts printing ok, then just after a meter or less nozzles start dropping out in a growing block. So it's not random nozzles but blocks of nozzles, growing with each pass.
And the coolest (uncoolest, actually) thing about it is that when you run the nozzle check right afterwards, it's 100% ok most of the time! :)
No air in tubes, dampers, operating conditions are perfect, wipes and caps cleaned everyday and well-adjusted. Happened with both the 790 and 791 ink.
Just had a long onsite visit by an HP technician, very professional, but even he was totally confused.
So... never had problems like that with any Seiko 64s or Oce 6060. I know that two things changed since the 64s - printhead voltages and ink formulation.
PH voltages are now much lower than they used to be, maybe it follows the changed ink formulation? New 791 inks IMHO dry faster and give a better looking print, but that doesn't solve the problems at all.
It's all as if there was air in the printhead itself, but... there is no air in the system, so would it be inside the PH? I think not... I'd increase/decrease the PH voltages by 1 or 2 volts, but i don't want to experiment.
my first Seiko had issues out of the box, I professionally protested to the multiple tech service visits not fixing the issues & a 2nd replacement printer was set out.
problems solved......
my first HP9000 had issues out of the box as well. Again, I professionally to the multiple tech service visits not fixing the issues & a 2nd replacement printer was set out.
problems solved.......sorta, but I missed my Seiko at that point.
MY POINT is that with approximately the same cost in 25 replaced heads after install within the first 12 months of service, the entire printer could have been replaced. Not to mention your companys production suffered causing how much in monthly monetary loss?
IE several shops producing graphics with one or two HP9000's gross over 100K in one month solely from prints. If a machine is producing only 1/3 of its share of usable, sellable product, then that HURTS ALOT!
I would be (and would have been) on HP tech constantly. I would be getting the top #1 & #2 techs on the line each week to get that lemon of a machine replaced.
I cannot believe that hasn't occurred yet. Has anybody checked to see if "whatever" is driving the voltages from the board to the heads is ACTUALLY consistantly delivering those voltages? Is there a rubbed short in the wire harness that possibly gets wider with carriage movement or internal temp?
REMEMBER the company purchased a printer that prints at X speed with no banding. That was advertised to be able to operate unchaparoned and make sellable products. HP is a huge company, they can surely absorb the 15K it actually cost them to build one of these printers....
Here the same problem, since 4 weeks still unsolved.
Actualy this posting should be at the 64s colorpainter but since we xperience exactly the samen problem i post is here also, maybe someone can help us out here..
Replaced the magenta printhead, tubing, capping station and spend lot's time testing.
There is no tube leaking or somenthing similar. Problems occured after last two ink changes magenta.
After 50cm of printing magenta head losing nozzles. (blockform) directly after the job is finished start a nozzle test and everythings looks fine! Not even one nozzle missing.
My opinion, something is changed with the ink on 64S, HP recently changed there ink, now they are switching back to old ink. Problem was exactly the same as we experiencing on our SEIKO 64.
I think (hope) the problem described here is solved now? Let us know please.
Someone with i bright idea? I think we did everything possible?
