Listen Technologies LR-500 - Manual (Page 41)

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I cannot change channels when pressing the UP and DOWN buttons or the SEEK button.
The unit is locked. Press the SEEK button for 5 seconds to unlock.
When I change channels, only certain channels are accessible.
The unit has been programmed to tune to only certain channels (LR-500 only). You can change
these channel lock-out selections by re-programming the unit (see page 13).
My batteries are not charging.
Make sure the battery switch is in the NiMH setting and that you are using NiMH (Nickel Metal
Hydride) batteries. Make sure you are using only a Listen supplied charging unit or transformer.
Never try to charge alkaline or NICAD batteries.
I want to run the unit from a wall transformer.
Simply plug a Listen approved transformer (LA-208) to the CHG/PWR connector on the
side of the unit. Batteries do not need to be installed when operating the unit with a wall
transformer; however, if you have NiMH batteries installed and the BATTERY select switch is set to
NiMH, the batteries will charge while the unit is being used.
It’s confusing for users to have 32 choices when switching between channels.
Use the programming feature (only available in the LR-500) to limit the number of channels
accessible by users.
Troubleshooting
Troubleshooting
Users keep changing channels.
You can prevent users from changing channels by locking in the channel selection. This is done
by pressing and holding the SEEK button for 5 seconds. When the channel is locked, the padlock
icon will appear on the LR-400 and LR-500 displays. The LED will also flash when the channel is
locked and seek is pressed. In addition, you can lock the access doors to the units.