Replacing The Main Circuit Board; Replacing The Mmi Circuit Board - Husqvarna Automower 305 Technical Manual

6. Fit the battery cover. The sealing strip is
reusable and does not need to be replaced.
7. Tighten the four screws for the battery
cover (Torx 20).

5.9 Replacing the main circuit board

1. A mower's operating information is stored
in the main circuit board. The Autocheck
EXP service program saves this information
in the logbook and then transfers it back
to the mower again when the main circuit
board has been replaced. The mower shall
therefore be connected to Autocheck EXP
before changing the main circuit board. The
operating data is then saved automatically.
2. Remove the battery. See "5.8 Replacing the
battery" on page 58.
3. Disassemble the body, display cover and
chassis. See "5.2 Disassembling and
assembling the robotic lawnmower" on
page 54.
4. Disconnect all cables from the main circuit
board. Pull on the connector, not the cable.
Note the connector in which the cables are
fitted so that the right cable is in the right
position when reassembling.
5. Unscrew the three screws (Torx 20) that
secure the main circuit board in the chassis'
lower part.
6. Remove the old main circuit board. If, for
example, the board is to be checked in
order to evaluate the guarantee it should be
stored in a bag with protection against ESD
(electrostatic discharge).
7. Fit the new main circuit board.
8. Screw in the three screws that secure the
main circuit board in the chassis' lower part.
NOTE! Do not tighten the screws too tightly.
It can damage the circuit board. Do not use
an electric screwdriver.
9. Connect all connectors in the control card.
Check that the cables are located correctly.
10. Assemble the chassis, display cover and
body. See "5.2.4 Assembling the chassis,
display cover and body" on page 55.
11. Fit the battery. See "5.8 Replacing the
battery" on page 58.
12. Connect the mower to Autocheck EXP and
select Programming. The service program
will then ask for the mower's serial number.
5. REPAIR INSTRUCTIONS
Select the correct serial number in the
logbook. Autocheck EXP now automatically
transfers the operating information saved in
step 1.
If the current robotic lawnmower for any
reason is not in the logbook in Autocheck
EXP, the serial number must be entered
manually. For security reasons, the serial
number can only be entered once, and it is
therefore very important to enter the correct
serial number. The serial number is printed
on the plate on the inside of the cover.
If the main circuit board is replaced when
troubleshooting and you are not sure if
the new main circuit board will be kept in
this robotic lawnmower, it is possible to
temporarily program the main circuit board
in a so-called Service Mode. See "4.3.4
Programming" on page 46.
IMPORTANT INFORMATION
For security reasons the serial number
can only be entered once. You should
therefore ensure that the correct serial
number is entered.
13. Test that the mower works.
When the main switch is set to position 1 after
changing a main circuit board, a new start-up
sequence commences, which includes entering a
new PIN code.
5.10 Replacing the MMI circuit
board
1. Disassemble the body. See "5.2.1
Disassembling the body" on page 54.
2. Remove the display cover. See "5.2.2
Disassembling the display cover" on
page 54.
3. Place the display cover upside down. Place
the mower on a soft and clean surface to
avoid scratching the body.
4. Disassemble the cables for the stop
button's microswitch and keypad.
5. The MMI circuit board is secured in the
display cover by means of two snap
fasteners. Carefully bend the snap
fasteners and lift the MMI circuit board in
the edge on which the snap fasteners are
located.
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