Husqvarna 420 Operator's Manual page 16

The STOP button on top of the robotic lawnmower is
mainly used to stop the mower when it is running. When
the STOP button is pressed a hatch opens, behind
which there is a control panel. The STOP button remains
depressed until the cover is closed again. This, together
with the START button acts as a start inhibitor.
The control panel on the top of the robotic lawnmower is
where you manage all the robotic lawnmower settings.
When the main switch is set to position 1 for the first time,
a start-up sequence begins which includes a number
of important basic settings, see 3.8 First Start-up and
Calibration on page 32.
Movement Pattern
The movement pattern of the robotic lawnmower is
irregular and is determined by the robotic lawnmower
itself depending on the appearance of the lawn. The
mower does not always mow in straight lines and one
movement pattern is never repeated either. With this
cutting system the lawn is mown without any mowing
lines after the robotic lawnmower.
If the robotic lawnmower enters an area where it senses
the grass is longer than average, it can change the
movement pattern. It can then mow in a spiral pattern to
faster cut the area of longer grass. This is known as spiral
cutting.
Finding the Charging Station
The robotic lawnmower can be set to search for the
charging station in one or more of three different ways.
The robotic lawnmower automatically combines these
three search methods to locate the charging station as
fast as possible but also to avoid as many tracks forming
as possible.
Using the manual settings options, the three search
methods can be combined to optimize the search for the
charging station for the shape of the yard in question, see
Installation on page 16.
Search method 1: Irregular
The robotic lawnmower operates irregularly until it gets
close to the charging station.
The benefit with this search method is that there is no risk
of tracks on the lawn from the robotic lawnmower. The
disadvantage is that search times can be somewhat long.
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