Installation & Operation Manual

Wilat_Op_Man_23Oct08.doc CONFIDENTIAL
Aearo Technologies Page 19 of 21 18/07/2007
Note: The WiLAT nominal operating range of 20 feet will vary, depending on the room
characteristics, facility construction, and the size and proximity of metal objects relative to
the WRU and WBU components.
8. Replacing the WRU battery
Note: Replacement of the WRU rechargeable battery requires opening the plastic housing and
removal of circuit boards. As such, battery replacement should be performed only by
special instrument service representatives in accordance with standard ESD precautions. It
is recommended that this service be included as a routine part of the E-A-RTONE WiLAT
System annual calibration process.
Under normal conditions, the battery life of Li-Ion battery in the WRU will be approximately 400
charge cycles. When the battery requires replacement;
1. Open the back cover of the WRU housing and carefully remove the circuits.
2. Locate the battery plug and adhesive tab on the back of the audio board. See Figure 8.1
below.
(add another photo showing the removed battery & adhesive tab)
Figure 8.1
3. Remove the battery plug from the socket.
4. Pull on the adhesive tab in direction parallel to the surface of the board until the adhesive is
released and the battery can be removed.
5. Install a new battery by carefully placing it within the perimeters of the white lines on the back
of the board.
6. Reinstall the boards and reassemble the housing.
7. Test that the system works normally.
8. The spent battery should be disposed of or recycled in accordance with applicable
international, or U.S. federal, state, and local regulations.