Replacing The Main Board - Husqvarna WS440HF Workshop Manual

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REPAIR INSTRUCTIONS
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Replacing the Main Board

When working with
electronics, use an ESD
bracelet.
Be sure to document where
all the wires are connected!
First see: Opening the PP 490 (p.
124)
Note the running hours
before replacing the
mainboard. See:
Menu (p. 71)
First of all, start the power pack,
connect the remote and note the
running hours for the equipment�
Then, make sure that the power
pack is not connected to power! If
it has been connected let it rest for
at least 5 minutes as there are large
capacitors inside accumulating
power for some time� To be able
to successfully upgrade the power
pack a few things are needed�
1� Unplug the 4 contacts, the 6 wires
and disconnect the ground wire
that's mounted to main board�
2� Flip over the power pack on
the other side and unplug the 2
connectors on the mainboard�
3� Carefully unplug the antenna�
4� Unscrew the 6 screws that holds
the main board in place�
5� Remove the main board�
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RC Service
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