HP755cm displays "Ready for media"

[Rakoczi]

Hi:

I have a problem with my HP 755CM plotter. It loads the paper but when it tries to align the cartridges or I send a printing job is when the panel displays "ready for media" or "out of media" even with the paper loaded. I changed the media sensor and the first one was installed in a second plotter and it works fine. Media sensor test was done and it pass correctly when I load and unload a piece of paper.

The first option was to change the media sensor, the second options in the service manual is to change the Main PCA Board. But it makes me laugh. The cost of a new one is almost or the total cost of the printer.Please send me any information you have that could help me to solve the problem.

Javier