Kenwood NX-420 - Manual (Page 16)

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Side 2 key
Press to activate its programmable function {page 10}.
Types I and II: The default setting is [Backlight].
Type III: The default setting is [None] (no function).
S, A, keys (Types I and II only)
Press to activate their programmable functions {page 10}.
S key: The default setting is [None] (no function).
A key: The default setting is [None] (no function).
key: The default setting is [Zone Down].
C> key: The default setting is [Zone Up].
Keypad (Type I only)
Press these keys to send DTMF tones. These keys can
also be programmed with secondary functions {page 10} if
a programmable function key is programmed as [Function].
Speaker/ Microphone jacks
Insert the Speaker/ Microphone or Headset plug into this
jack {page 5}.