Husqvarna Automower 550 Workshop Manual page 23

3. Push the clips to the ultrasonic sensors and lift them
up.
4. Disconnect the cables of the ultrasonic sensors.
5. Install in opposite sequence.
6.16.6 To replace the ultrasonic circuit board
1. Remove the body. Refer to
the body on page 13 .
2. Remove the upper chassis. Refer to
install the upper chassis on page 14 .
3. Disconnect the 2 cables from the ultrasonic circuit
board.
4. Remove the 2 screws and holders that holds the
ultrasonic circuit board to the lower chassis.
5. Remove the ultrasonic circuit board.
6. Install in opposite sequence.
6.16.7 To replace the front loop circuit board
The front loop sensors are integrated in the front sensor
circuit board. The sensors cannot be replaced
1541 - 001 -
To remove and install
To remove and
separately. The front sensor circuit board must be
replaced as a unit.
1. Remove the body. Refer to
the body on page 13 .
2. Remove the upper chassis. Refer to
install the upper chassis on page 14 .
3. Disconnect the cable.
4. Remove the screw and the holder for the front loop
circuit board.
5. Pull up the front sensor circuit board.
6. Install in opposite sequence.
6.16.8 To replace the rear loop sensors and tilt
sensor
The rear loop sensors and tilt sensor are integrated in
the motor control circuit board. The sensors cannot be
replaced separately. The motor control circuit board
must be replaced as one unit. Refer to
motor control circuit board on page 20 .
6.16.9 To replace the lift sensor circuit board
The magnet on the joysticks must be installed correctly
for the correct operation of the lift sensors. If this is not
the condition, parts of the front joystick must be
To replace the front joysticks on page
replaced. Refer to
18 .
1. Remove the body. Refer to
the body on page 13 .
2. Remove the upper chassis. Refer to
install the upper chassis on page 14 .
To remove and install
To remove and
To replace the
To remove and install
To remove and
Repair instructions - 23