Replacing the Backup Battery for the Real-time
Clock
The TD2u uses a real-time clock (RTC) with a backup battery. The battery has a shelf life of 12-18
months. If you use the TD2u regularly, expect the battery to last longer than 18 months. As the
battery discharges, the TD2u displays a low battery warning message.
This section provides an illustrated procedure for replacing the RTC backup battery.
Compatible Batteries
The TD2u uses an ANSI/NEDA type 5012LC battery. The following table lists three common
batteries compatible with the TD2u.
Manufacturer Model #
Duracell DL1220
Energizer CR1220
Rayovac CR1220
Replacing the Battery
It is necessary to open the TD2u case in order to replace the battery. You need a #1 Phillips
screwdriver to open the TD2u case and a small flat-blade screwdriver to remove the battery.
The following procedure provides the steps for replacing the battery:
1. Disconnect all the power supply and all cables from the TD2u before opening the TD2u
case. Never connect the power supply or operate the TD2u with the case open.
2. After disconnecting the power supply and all cables, turn the TD2u upside down on a
clean work surface.
3. Remove the four screws and set them aside. The following photograph shows the loc-
ation of the four case screws.
64 Tableau TD2u User Guide Version 1.3.0
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