VTech IS741 Manual - Manual (Page 12)

If you already have a wired doorbell installed, follow the
instructions below to install your new IS741 doorbell unit.
Turn off the power supply to the existing wired doorbell.
Follow Step through Step 5 in
Doorbell wall mount
installation from pages to .
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.
1.
2.
3.
Installing the doorbell with an existing wired
doorbell (optional)
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.
4.
Option 1: Ring the front doorbell of the existing wired
doorbell and the IS7121 doorbell simultaneously.
View
Right
Angle
Adjustment
View
Left
Chime/buzzer of
wired doorbell
Transformer
Rear Trans Front
View
Right
Angle
Adjustment
View
Left
Transformer
View
Right
Angle
Adjustment
View
Left
Transformer
View
Right
Angle
Adjustment
View
Left
Transformer