Not sure how many of you are still using a JV4 but FYI everyone has come up against the temp error you get when you remove a printhead without replacing it with another head. Sometimes you even put in a head that is clogged beyond repair but still has good electronics just to fool the JV4 into thinking there is still a good head there. I discovered on my printers that the JV4 only requires heads in the rear and not in the front(3 heads in front, 3 in rear, 12 colors total). So you can remove the fronts heads without getting the temp error. Of course only remove the heads with printer off and be careful not to short out a ribbon cable(it will ruin your day). Hope this is of help to someone.
Tks,
Jwalknet
Tks,
Jwalknet