Husqvarna Automower 420 Technical Manual page 93

6.2.3 Symptoms during docking
Table 7: Symptoms during docking
Symptom
The robotic
lawnmower detects
the F signal, but
cannot dock
The robotic
lawnmower drives
straight into the
charging station
6. TROUBLESHOOTING
Cause
Dirt/leaves/grass have
accumulated in the charging
station and are preventing the
mower's charging strip from
making contact with the charging
station's charging strip.
N signal from the antenna plate
is faulty.
The cables for the charging
strips in the mower are not
connected or connected
incorrectly.
The cables for the contact strips
in the charging station are not
connected or are connected
incorrectly.
The mower cannot detect the
F field and therefore does not
turn in front of the charging
station.
Action
Clean the charging station.
Check N signals, see 2.6 Tool menu, functions on
page 28.
Check that the cable lugs for the charging strips
are intact and properly connected. Ensure the
correct cable is connected to the right charging
strip. Remember that plus and minus must be
correctly connected. Refer to 5.6 Replacing the
charging strips on page 64.
Make sure the cable lugs for the contact strips are
intact and properly connected. Ensure the correct
cable is connected to the right charging strip.
Remember that plus and minus must be correctly
connected. Refer to 5.6 Replacing the charging
strips on page 64.
Check the LED on the charging station. Refer to
6.4 Troubleshooting the loop signal on page 95.
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