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You need to reenable the roll unit in the parameters but for that you a SDS key to enter those parameters.

When you replaced the Z-motors did they come with the white plastic sleeve because they are usually the reason for Z axis problem and I have seen motors with out the sleeve available on the net.

Hello community, I am looking for the service manual for a HP FB750, I need to readjust the printheads.

If you want to eliminate the Miniscus try the same print with a different color the Miniscus is the same for all Colors + my honest opinion in this case is a dirty print head even if you have all your nozzles while you print ink accumulate on the head and simulate a ink starvation.

Have you tried replacing your hard drive!

At first look it could be a bad batch of ink I would flush the magenta line and reservoir and replace the filter and start with a new bag .

sometime nozzles are missing not because they’re clogged but because they are electrically dead and make sure when you soak your printhead your ink temperature is cold if not you can cause more damage.

I might have a spare motor if you interested.

I would start by cleaning your E-BOX with compress air, dust and static sometime can do funny things.

I am a tech and 9times out of 10 it is a damage encoder strip or dirty encoder sensor this is the first two things that needs to be done. If you start with motors and boards it will be very expensive and you will be very desappointed.