m
Data light (Green)
On when print data is stored in the print buffer (the section of printer memory
reserved for receiving data) but not yet printed.
Flashes when the printer is processing data.
Off when no data remains in the print buffer.
n
Error light (Orange)
On or flashes when an error has occurred.
o
OK button
Use these buttons to access the control panel menus, where you can make
printer settings and check the status of consumable products. For instructions
on how to use these buttons, see “Using the Control Panel” on page 137.
p
Right button
q
Down button
r
Left button
s
UP button
t
Return button
Use this button to return to a higher hierarchical level while doing settings.
u
Function buttons (F1 to F4)
Use this button to move to a menu displayed on the LCD panel.
DNF model
a
Quick-Dial buttons (1 to 12)
Use these buttons to transmit a fax to a registered fax number assigned to the
corresponding button.
b
Fax Memory button/LED
(Green)
Use this button to display the fax document list stored in the printer’s memory.
c
Mode buttons/LEDs (Green)
Use these buttons to switch to the corresponding mode.
d LCD panel Displays printer status messages and control panel menu settings.
e
Job Memory button
Use this button to register frequently used settings for Copy mode and Scan
mode or to call up the settings.
Epson AcuLaser MX21/MX20 Series User's Guide
Getting to Know Your Printer 28
