Epson Stylus 1500 Reference Manual page 50

Alt + LF/FF (Cleaning O)
Cleans the black print head; see "Cleaning the Print
Heads" in Chapter 3 for more information.
Alt + Load/Eject (Cleaning NNN)
Cleans the color print head; see "Cleaning the Print
Heads" in Chapter 3 for more information.
Pause + Operate button (Printer adjustment mode)
Enters printer adjustment mode and prints a
multilingual instruction sheet on calibrating the
printer. (Paper must be loaded in the printer.) Hold
both buttons until the font lights flash. Use this
mode only if you are printing from DOS
applications. To exit printer adjustment mode, press
the Pause button and turn off the printer.
Note:
When using the following Operate button combinations, wait
until the Data light flashes or paper is loaded before releasing the
buttons.
Load/Eject + Operate button (LQ self test)
Checks the paper length and performs a printer self
test at 360 dpi; see "Testing the Printer" in Chapter 1
of your Setup and Software Guide for more
information.
LF/FF + Operate button (Draft self test)
Checks the paper length and performs a printer self
test at 180 dpi; see "Testing the Printer" in Chapter 1
of your Setup and Software Guide for more
information.
Controlling the Printer
2-5