Epson SureColor P20000 Standard Edition 64" Large-Format Inkjet Printer - Manual (Page 159)

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You see a window like this:
5. Click Start to begin the cleaning cycle.
When the cleaning cycle is finished, the power light stops flashing and a confirmation screen
appears.
Caution: Never turn off the product during a cleaning cycle or you may damage it.
6. Click Nozzle Check .
7. Click OK .
The nozzle pattern prints.
8. Check the printed pattern to see if there are gaps in the lines.
Note: Use at least a 10× eye loupe to examine the pattern for any missing or deflected dots or
segments.