Repair Instructions - Husqvarna Automower 420 Technical Manual

5 Repair instructions

All repairs to robotic lawnmowers should be done in-
doors on a clean work bench to protect sensitive compo-
nents from moisture and dirt.
All screws in the robotic lawnmower must be fitted using
the correct tightening torque according to Table 3: Screw
Fasteners on page 82.
IMPORTANT INFORMATION
Oil, grease and dirt on electrical
connections can cause intermittent
faults on the robotic lawnmower. These
faults only occur at times, which make
them difficult to find. Never touch
sensitive electronic components with
your fingers, for example, connectors or
components on a circuit board.
To avoid electrostatic discharge in
electronic components always earth
yourself, for example against a radiator,
before you start to work on electrical
components.
Always disconnect cables from a
component by pulling the connector. Do
not pull the actual cable.
Never use any form of silicone or the like
when repairing a robotic lawnmower.
If possible test that components work
before completely assembling the
robotic lawnmower.
Always set the mower's main switch to
0 before connecting or disconnecting
any connectors (for example HMI cable
to main circuit board). If the main switch
is left in position 1, there is a risk the
circuit board will be destroyed when
connecting.
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5. REPAIR INSTRUCTIONS