Getting started
19
Installing the doorbell with an existing wired doorbell
If you already have a wired doorbell installed, follow the instructions below to install
your new IS7121 doorbell unit.
Turn off the power supply to the existing wired doorbell.
Follow Step 1 through Step 5 in Doorbell installation on pages 14-16.
Insert a cross-head screwdriver to the side of battery compartment on the right,
then twist and lift to loosen the screw and the metallic plates. Using a wire, slide
one end of the metal part of the wire underneath the metallic plate, then twist the
screws to secure. Connect the other end to the transformer.
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