Xpres Subli-Print Epson R1800: Feeder System Troubleshooting Guide - Manual (Page 9)

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APPENDIX B - How to Get a Good Nozzle Check
DO NOT USE THE AUTO NOZZLE CHECK AND CLEANING FUNCTION
A perfect nozzle check should look like this:
A nearly perfect nozzle check will look like this
Note: if at any time your nozzle check is almost perfect like the one above, then you are ready to start printing,
it most likely that the remaining couple of nozzles will drop in during a print.
A bad nozzle check will look like this: