Husqvarna Automower 420 Technical Manual page 32

NB
! If you have to help the wheel to go
round by hand in order to get the wheel
motor started and if the wheel motor stops as
soon as the wheel is blocked, the fault lies in
the main circuit board and not in the wheel
motor.
NB!
If a motor fails to start and is very
difficult to rotate by hand, the fault may lie in
the main circuit board or the wheel motor.
Press BACK to exit the test.
Cutting motor
The battery voltage should be at least 18 V when
testing the blade motor.
Place the cursor on Start and press OK to start the
test.
WARNING
The blade disc rotates during
the test of the blade motor. Keep
your hands and feet at a safe
distance.
The following values are shown on the display:
• Speed: The speed is normally 2,300 rpm.
• Current: An indication value of how much
power is needed to sustain 2,300 rpm. When
operating the blade motor with blade disc
and blades fitted but without cutting grass,
the normal value is 350 mA +/- 100 mA.
• Voltage: The battery voltage should be at
least 18 V in order to evaluate the function of
the blade motor.
Press BACK to exit the test.
User interface
Keypad
The display indicates which button is pressed down.
Press BACK to exit the test.
Display
The display flashes on and off a number of times.
Press any key to exit the test.
English - 32
2. SPECIAL MENU FUNCTIONS