Sony DWZ-M50 Operating Instructions Manual page 31

Symptom
Channels cannot be
changed.
The RF indicator on
the receiver lights
even when the
transmitter is off.
Meanings
Button operations are locked. Set the button lock switch to
The settings menu is not
open.
Interference is being
received.
Remedy
UNLOCK.
Follow the instructions in
"Displaying the settings menu"
and "Configuring the receiving
channel settings" (page 18) to
configure settings. (ZRX-HR50)
Set the receiver to a channel for
which the RF indicator does not
light, and then set the transmitter
to the same channel.
Troubleshooting 31