Question about HP DesignJet 450c InkJet Printer
Remove the top cover and stick some paper into the switch on the left side of the menu to simulate the cover closed. Now power on the plotter and watch what happens. The carriage assembly should move all the way to the right and then back to the left. If will then move to the right again and then back to the left and start to find the mark encoder which is a white piece on the left end of the paper platen. You should see the red light come on underneath on the right side of the carriage assembly as it tries to read the mark encoder. Does the red light come on? If not I really do not see how the printer can come to load media unless you get all three lights on the right and then you hit cancel and then it say load media. That sensor does have a habit of picking up a lot of black ink. If the plotter is old and has been used a lot, it is possible the sensor is clogged with ink. The best way to clean it is to remove the left side cover and remove the service station. You will then have access to that sensor without having to remove the carriage assembly from the plotter. The other thing you will want to do is clean the encoder strip with a damp lint free cloth
Click on the link below to view the HP Design jet 450c user guide
Posted on Jul 06, 2010
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Posted on Jan 02, 2017
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