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STPSMIKE
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DesignJet T770 printing fine gray/black lines on all plots even diagnostic plots

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DesignJet T770
Microsoft Windows 7 (64-bit)

I have an HP DesignJet T770 that recently had an error to where I had to have the main pca replaced.  That fixed that problem, but now on every plot there are fine gray/black areas on all plots.  Seems like a logic error.  All diagnostics through the service menu come up okay.  I have attached some photos of the issue I'm experiencing.  Please help for a possible solution.T770 PICS.gifT770 PICS1.gifT770 PICS2.gif

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JackB44
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Hough, I've have had a bit different problem but also related to prithead out of control like yours.

Did you performed Carriage diagnostics from Diagnostics menu? (You can ask to do this the same guy who repalced Engine PCA, access is described in service manual but requires some experience).

 

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STPSMIKE
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Did carriage diagnostics through the service mode, and it was ok.  Going to start with swapping the carriage pca.  If that doesn't work, then on to the formatter/hdd.  Thank you for the input.

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