Epson WorkForce Pro WF-M5799 Workgroup Monochrome Multifunction Printer with Replaceable Ink Pack System - Manual (Page 331)

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Running a Product Check
Running a product check helps you determine if your product is operating properly.
1. Disconnect any interface cables connected to your product.
2. Load plain paper in the paper cassette.
3. Press the home button, if necessary.
4. Select Settings .
5. Select Maintenance .
You see a screen like this:
6. Select Print Head Nozzle Check .
You see a screen like this:
7. Select Start .
The nozzle pattern prints.