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After replacing the printheads,the machine flashes the exclamation mark on the yellow printhead saying that it is worn out (on the new printhead). All of the other ones have their status as "inserted". Since acquiring the printer, we replaced the belt, the interconnect cable, the ink tube system, and the ink supply station. The printer finally prints, but the patterns come out like this (the pattern appears to be staggered by 1 mm) enter image description here and the machine says it failed to align the printheads. When the carriage moves, it seems as though there is a slight lag between how the belt pulls the carriage and its movement. What should we do to proceed?

The machine is a designjet 500 42".

enter image description here

links: http://h30499.www3.hp.com/t5/Printers-Designjet-Large-Format/HP-designjet-500-printhead-allignment-issue-staggered-pattern/td-p/6485552#.U3-s_yjHnoU

http://h30434.www3.hp.com/t5/Printing-Issues-Troubleshooting/HP-designjet-500-printhead-allignment-issue-staggered/m-p/3943490/highlight/false#M88792

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My friend, i had the same problem. I had to change the belt. After open the plotter and put the new belt, i've tried to allign the printheads, and it failed. My patterns was the same as the ones in your image.

After trying a lot of things, i i've remembered that the carriage had two small plastic pieces, between the carriage and the metal bar, where the carriage moves. Finally, I flip those two pieces upside down, and it gaves the carriage a lot more stability. That simple flip on those plastic "rings" solve my problem.

Hope that this helps you.

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