Loop Signal - Husqvarna Automower 420 Workshop Manual

8.2.4 Symptoms during charging
Symptom
Both the mowing and charging
times are shorter than usual
The product never leaves the
charging station
8.2.5 Miscellaneous symptoms
Symptom
The display is lit but but the
keypad does not lead to any
reaction
The display shows the Load-
ing program text
The display flashes or shows
incorrect information

8.3 Loop signal

Note: Refer to the Operator's manual for more
information about how to rectify errors.
When measuring loop signal strength the product should
be placed in the charging station. Use the
Loop menu function to check that the signal strength is
within the expected values. The test provides a quick
answer to if the charging station generates all signals
and if the product can detect these signals. Refer to
Tools - Info - Loop on page 10 .
56 - Troubleshooting
Cause
Low battery capacity.
The parking mode is activated.
Schedule settings are preventing the
product from leaving the charging station.
The product never becomes fully charg-
ed.
The power supply is faulty.
Cause
The main circuit board is faulty.
Faulty keypad.
The HMI circuit board is blocked.
The HMI circuit board is blocked.
Tools - Info -
Action
Battery test to determine the
Perform a
battery's capacity. Refer to
page 16 .
Restart the product on main or secondary
area.
Check the Schedule settings. Also check
that the clock shows the current time.
Check that the product is receiving the
charging power. Check that the value for
the current corresponds with the guide-
line values. If the charging strips appear
to be burnt or coated, clean them using a
fine grade emery cloth. Check that the
rear sensor module and the charging
tower are correctly connected, and that
they are not damaged.
If the problems remain, try the following:
• Replace the charging tower.
• Replace the rear sensor module.
Check that the product is receiving the
charging power. Check that the value for
the current corresponds with the guide-
The battery system on page
line value in
32 .
Action
Reprogram the main circuit board using
Programming a
Autocheck. Refer to
blocked main circuit board on page 16 .
Replace the keypad. Refer to
the keypad 420/430X/430XH/440/450X/
450XH on page 23 .
Program the product using Autocheck.
Program the product using Autocheck.
Auto test on
To replace
1191 - 001 -