Out of all of the machines I work on (all Mutoh, Mimaki and Roland models) the ValueJet series heads are the easiest to install. I have many customers who have successfully installed their own heads. Find a tech manual for that model and read the install procedure to see how comfortable you would be with it. I am not allowed to give you one legally but it is easy to find around here.
TIPS:
- Turn off the machine, unplug it and then hit the power button a few times before working on any part of the machine.
- Replace the dampers with the new head
- Replace the head cable if it is damaged or dirty
- Wet the manifold with cleaning solution before installing the dampers to prevent breakage
- Run all of the alignments. There seem to be a lot but if you do all of them, it saves you a headache later.
- Once the head is out, clean up all of the excess ink that builds up around the head area.
- Be patient, stay calm, and take a break if you get frustrated. Most mistakes happen from being too quick or trying to force something that you might be struggling with.