Polk Mono UM1 Installation And Operation Manual page 18

4. With the unit turned off, press and hold the Power Button until the system version
information is displayed on the screen.
5. Press the Encoder Knob button to turn the LCD display off.
6. Press the Power Button to turn on the unit.
The lock code has now been reset to "0000".
7.
INFO
Alternate Display Information
INFO option is available in TUNE, CAT and PSET LIST modes. Press INFO soft button to
change the display information in the following order:
NAME (Artist) > SONG (Title) > INFO (Content, if available) > CAT (Category) > NAME
(Artist).
Satellite Signal Strength
The display will indicate satellite reception strength as shown below.
Signal Strength
No Signal
Weak
Good
Excellent
Strength Display
16
UM1