ML620/ML621 User’s Guide  77
Testing the Printer
Font Sample Test
Rolling ASCII Test
Hexadecimal Dump Mode
Font Sample Test
Important!
Wide carriage Model ML621: If you are using 8.5” 
paper to run the tests, make sure the paper width 
selection in the printer menu is set to 8.5 inches. 
Otherwise, printing on the platen may damage 
the printer. See Chapter 4: Menu Mode for more 
information.
The Font Sample Test prints a sample of the fonts 
standard to the printer.
The top of the printout shows the Printer Model, 
Emulation (Microline, Epson, IBM compatible), 
Firmware (F/W) Revision Level, Flash Loader (LD) 
Revision Level, and Part Number.
Make sure paper is loaded.
Turn off the printer.
Press and hold the SEL + LF/FF keys while turning 
the printer back on.
When only the SEL indicator is blinking, hold 
down the LF/FF key and press the LOAD/EJECT 
key. 
The printer prints a page of font samples and the 
test ends.
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