184 OPTIONAL UNIT INSTALLATION Optional unit installationInstall the optional unit as follows:q Rotate [VOL] to turn the power OFF, and remove the batterypack. (p. 3)w Remove the unit cover.NOTE: Use a flat head screw driver or a similar flat instru-ment, and insert into the hollow of the chassis, then lift andtake away the unit cover. (The removed cover cannot be usedagain.)e Install the unit as shown below.r Replace the unit cover and the battery pack, then rotate [VOL] toturn the power ON.NOTE: The optional UT-109/UT-110 SCRAMBLER UNITS requiressome PC board modifications. Please refer to the additional in-stallation as at right.*This illustration isdescribed with theUT-110.