Epson ET-4700 User Manual page 208

You see a window like this:
5. Click Start to begin the cleaning cycle.
You see a message on the computer screen during the cleaning cycle.The
throughout the cleaning cycle and stays on when the cleaning cycle is finished.
Caution: Never open the inner cover or turn off the product during a cleaning cycle or you may
damage it.
6. When the cleaning cycle is finished, you can check to see if the nozzles are clean; click Print Nozzle
Check Pattern and click Print.
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power light flashes