Epson ActionPrinter 4000 User Manual page 30

Testing the Printer
The self test is 8 inches wide on the standard width printer and
14 inches wide on the wide carriage printer.
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CAUTION: Never run the self test using paper that is
.
narrower than 8¼ inches (210 mm) on the standard width
printer or 14 inches (360 mm) on the wide carriage printer.
This prevents the print head from printing directly onto
the platen, which can damage the print head.
Although the self test can be run with continuous paper, use a single
sheet of paper now because single sheet loading is easier.
1. Make sure the printer is turned off.
2. Push the paper release lever back to the single sheet position.
1-16 Setting Up the Printer