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14
Replacement of back-up battery
User qualification, installation of the secondary module: Elec‐
n
Ä Chapter 2.4 'User qualification' on page 14
trical technician
1.
Disconnect the system from the power supply.
2.
Open the transparent cover, .
Fig. 130: 4 screws
3.
Use an appropriate screwdriver to loosen the 4 screws.
4.
Disconnect the connecting ribbon cable between the lower
circuit board and the upper part of the device.
Fig. 131: Button cell battery (1)
5.
Replace the button cell battery (1).
6.
Connect the connecting ribbon cable between the lower cir‐
cuit board and the upper part of the device.
7.
Use an appropriate screwdriver to tighten the 4 screws.
8.
Close the transparent cover, .
Replacement of back-up battery
A2995
1
A3049
121
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