Husqvarna Automower 420 Workshop Manual page 21

5. Disconnect the power cable/cables (A) from the
main circuit board.
B
CAUTION: Always disconnect the power
cable first to prevent current spikes that may
harm the circuit boards or the battery.
6. Disconnect the HMI cable (B) from the main circuit
board.
7. Remove the upper chassis.
8. Install in opposite sequence.
1191 - 001 -
A
9. When you connect the cables make sure to put the
cables in the cable holders. To put the cables into
position in the upper chassis:
To put the cables into position in the lower chassis:
Note: Attach a new warranty seal. The warranty seal
must be included and unbroken for the warranty to be
valid.
CAUTION: The cable routing is important to
avoid disturbance of the loop sensor board.
CAUTION: Always connect the HMI cable
before the power cable to avoid current spikes
that may harm the circuit boards or the battery.
CAUTION: Make sure that no cables are
pinched.
CAUTION: Replace the sealing strip each time
you install the upper chassis.
Repair instructions - 21