VTech IS7121/IS7121-2/IS7121-22 user manual Transformer, Chime/buzzer of wired doorbell, Rear

Installing the doorbell with an existing wired doorbell (optional)

If you already have a wired doorbell installed, follow the instructions below to install your new IS741 doorbell unit.

1.Turn off the power supply to the existing wired doorbell.

2.Follow Step 1 through Step 6 in Doorbell wall mount installation from pages 7 to 10.

3.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.

Transformer

4.Using another wire, slide one end of the metal part underneath the metallic plate on the doorbell, then connect the other end to the Trans terminal of your chime/buzzer unit of the wired doorbell.

Option 1: Ring the front doorbell of the existing wired doorbell and the IS7121 doorbell simultaneously.

Transformer

Rear Trans Front

Chime/buzzer of wired doorbell

12