Husqvarna Automower 320 Technical Manual page 95

3. Disconnect all connections from the charging
station and then measure the resistance in the
boundary loop. A value over 20 Ohm indicates
that there is a break. If the measured value
is less than 20 Ohm and the LED still flashes
blues, the fault is in the charging station's
cabling or the circuit board. See 5.21 Replacing
the main circuit board, charging station on
page 77.
4. Connect the charging station to the power
supply. Switch the connections between the
guide wire and the boundary wire in the charging
station.
a) Switch connections AL and Guide. Check if
the LED is flashing yellow.
b) Put AL and Guide back in their original
positions. Then switch AR and Guide. Check if
the LED is flashing yellow.
If the LED is flashing yellow (i.e. the boundary
loop is intact but the guide wire is not connected)
in test a) then the break is somewhere in the
boundary wire between AL and the position
where the guide wire is connected to the
boundary wire (thick black line in illustration A).
If the LED is flashing yellow in test b) then
the break is somewhere in the boundary wire
between AR and the position where the guide
wire is connected to the boundary wire (thick
black line in illustration B).
5. Put all connections back in their original
positions. Then disconnect AR. Connect a new
loop wire to AR. Connect the other end of this
new loop wire somewhere at the centre of the
installation. If the LED turns green then the
break is somewhere in the section between
the disconnected end and the position where
the new wire has been connected (thick black
line in illustration C). If that is the case, move
the connection for the new wire closer to the
disconnected end (approximately in the middle
of the suspected section) and check again
whether the LED has turned green. Continue
until only a very short section of the wire remains
which is the difference between a flashing blue
light and a solid green light.
6. When the break is found, the damaged section
must be replaced with a new wire. The damaged
section can be cut out if it is possible to shorten
the boundary wire. Use only original couplers
from the Husqvarna Group.
6. TROUBLESHOOTING
A
AL
Guide 1 Guide1
AR
B
AL
Guide 1
Guide1
AR
C
AL
AR
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