Husqvarna GARDENA SILENO MINIMO Instruction manual

GARDENA®SILENO minimo
Flymo®EasiLife GO
Workshop manual

Contents
1 Introduction
1.1 Document description............................................ 3
1.2 Servicing tools........................................................3
2 Safety
2.1 Safety definitions....................................................4
2.2 General safety instructions.....................................4
2.3 Special safety instructions......................................4
2.4 Symbols on the product......................................... 4
3 Product and installation
3.1 Main components for installation............................6
3.2 The loop system's control signals.......................... 6
3.3 LED indicator lamp on the charging station........... 6
3.4 Boundary loop........................................................ 6
3.5 Guide loop..............................................................6
3.6 Charging station..................................................... 7
3.7 Circuit boards and sensors.................................... 7
3.8 To do a test of the installation................................ 7
3.9 SensorControl/LawnSense.................................... 8
3.10 Safe operation in slopes.......................................8
3.11 New loop signal....................................................8
4 Autocheck service tool
4.1 Installation and login.............................................. 9
4.2 Product connections...............................................9
4.3 How to use Autocheck 3...................................... 10
4.4 Programming a new main circuit board................10
4.5 Demo mode..........................................................11
4.6 To recover the PIN code...................................... 11
5 Repair instructions
5.1 The body system..................................................12
5.2 The upper chassis................................................12
5.3 The lower chassis................................................ 12
5.4 The cutting system............................................... 13
5.5 To mount screws..................................................13
5.6 To remove and install the body system................13
5.7 To remove and install the lower chassis.............. 14
5.8 To remove and install the upper chassis..............14
5.9 To remove and install the STOP button............... 15
5.10 The circuit boards...............................................15
5.11 The battery system.............................................17
5.12 To clean and replace the ventilation filter...........18
5.13 To replace the body suspension parts............... 18
5.14 To replace the keypad........................................18
5.15 To replace the cutting module............................19
5.16 The wheel motors...............................................19
5.17 To replace the sealing strips.............................. 20
5.18 The charging station...........................................20
5.19 To mount screws in plastic.................................20
5.20 To mount thread plugs....................................... 21
6 Service
6.1 Service schedule..................................................22
6.2 Screw fasteners................................................... 22
7 Troubleshooting
7.1 Messages.............................................................24
7.2 Symptoms............................................................ 28
7.3 Loop signal...........................................................30
7.4 To find a break in the boundary loop....................31
7.5 Battery test........................................................... 31
8 Transportation, storage and disposal
8.1 Transportation...................................................... 33
8.2 Cleaning............................................................... 33
8.3 Winter storage......................................................33
8.4 Environmental information................................... 33
8.5 Removal of battery for recycling...........................33
9 Technical data
9.1 Technical data......................................................34
21595 - 001 - 01.02.2021

1 Introduction
1.1 Document description
The Workshop manual is intended for dealers and
service personnel, and is a supplement to the Operator’s
manual. The following system is used in Workshop
manual to make it easier to use:
• Text written in italics is a text that is shown on the
display or in the menus in the Autocheck service
program.
• Text written in bold is one of the buttons on the
keypad of the product or a button on Autocheck
service program.
1.2 Servicing tools
Always use original tools recommended by the
manufacturer.
1595 - 001 - 01.02.2021 Introduction - 3

2 Safety
2.1 Safety definitions
Warnings, cautions and notes are used to point out
specially important parts of the manual.
WARNING: Used if there is a risk of injury or
death for the operator or bystanders if the
instructions in the manual are not obeyed.
CAUTION: Used if there is a risk of damage to
the product, other materials or the adjacent area
if the instructions in the manual are not obeyed.
Note: Used to give more information that is necessary in
a given situation.
2.2 General safety instructions
WARNING: Keep your hands and feet away
from the rotating blades. Never put your hands
or feet close to or under the machine when the
motor is running.
WARNING: Apply a new warning label if a
warning symbol on the product is damaged or
missing.
WARNING: The original design of the product
must not be modified without the expressed
permission of the manufacturer.
Unauthorized modifications and/or components
can result in serious disruptions and the risk of
personal injuries.
Only use original spare parts.
2.3 Special safety instructions
2.3.1 Maintenance
WARNING: The product must be switched off
before any maintenance is done. The product is
disabled when the indicator lamp on the
ON/OFF button is not lit.
CAUTION: Never use a high-pressure washer
to clean the product. Never use solvents for
cleaning.
2.3.2 In the event of a thunderstorm
If there is a risk of a thunderstorm, all connections to the
charging station must be disconnected. This is done to
avoid damage to the circuit board in the charging
station.
2.3.3 Battery safety
WARNING: Lithium-ion batteries can explode or
cause fire if disassembled, short-circuited,
exposed to water, fire, or high temperatures.
Handle carefully, do not dismantle, open the
battery or use any type of electrical/mechanical
abuse. Avoid storage in direct sunlight.
For more information about the battery, refer to
Technical data in the Operator's manual.
2.4 Symbols on the product
These symbols can be found on the product. Study them
carefully.
WARNING: Read the user in-
structions before operating
the product.
WARNING: Disable the prod-
uct before working on or lifting
the product.
4 - Safety 1595 - 001 - 01.02.2021

WARNING: Keep a safe dis-
tance from the product when
operating. Keep your hands
and feet away from the rotat-
ing blades.
WARNING: Do not ride on the
product. Do not put your
hands or feet close to or un-
der the product.
Use a detachable power sup-
ply as defined on the rating
plate next to the symbol.
This product conforms to the
applicable EC Directives.
It is not permitted to dispose this product
as normal household waste. Ensure that
the product is recycled in accordance with
local legal requirements.
The low-voltage cable must not be
shortened, extended or spliced.
Do not use a trimmer nearby the low-
voltage cable. Be careful when trimming
edges where the cables are placed.
1595 - 001 - 01.02.2021 Safety - 5

3 Product and installation
3.1 Main components for installation
The robotic system involves 4 main components:
• Robotic lawn mower
• Charging station
• Power supply
• Loop wire
Go to the manufacturer's website or read the Operator's
manual for further descriptions about the product and
the installation.
3.2 The loop system's control signals
The loop system consists of boundary wire and guide
wire connected to the charging station. The loop system
essentially comprises these different signals:
• A signal, sets the boundary for the working area.
• F signal, is generated by a loop in the charging
station so that the product knows that it is in the
vicinity of the charging station.
• Guide signal, leads the product to the charging
station, but can also be used to guide the product
from the charging station to a remote area.
To check the A, F and Guide signals, refer to the Loop
signal on page 30 .
3.3 LED indicator lamp on the charging station
The loop system’s status is easily checked using the
LED indicator lamp on the charging station. Refer to
Loop signal on page 30 .
3.4 Boundary loop
The strength of the A signal varies depending on the
distance. The strength of the signal is high close to the
wire. The strength subsequently diminishes the farther
away from the wire you get. Outside the work area the
signal is negative and its strength diminishes more
rapidly. Signal quality should always be 100% for
satisfactory function.
A
15 m/49 ft.
160
100
40
The strength of the signal is affected by the size of the
work area, islands, headlands, passages and corners.
The signal can also be affected by magnetic objects in
the ground or in nearby walls and buildings. Examples of
magnetic objects are iron fences, iron girders and
reinforcement bars. Grass areas laid on concrete roofs
can therefore lead to a weaker signal.
The A signal’s reception and amplification can vary by
+/- 10% from one product to another. This means that at
the same point in an installation, one product can
display A=90 and another one A=100. The charging
station’s circuit board and the product’s loop sensor can
also give certain variations between different products.
3.4.1 To test the boundary loop
The product displays the No loop signal message if an
attempt is made to start the product before the
installation is complete.
However, it is possible to test the product before the
installation is completed by doing one of the following:
• Connect a short, temporary loop around the product.
• Temporarily deactivate the product’s loop detection.
Refer to Autocheck service tool on page 9 .
3.4.2 Obstacles
To demarcate an obstacle, you can put the boundary
wire from the edge of the work area to the obstacle,
around it and then back.
CAUTION: The boundary wire must not be
crossed on its way to and from an island.
3.5 Guide loop
The guide wire, together with the part of the boundary
loop that comprises the return to the charging station, is
called the guide loop. The current in the guide loop
always goes from the guide wire to the left in the
connection between guide wire and boundary loop.
The strength of the guide signal varies like the A signal
depending on the distance to the guide loop. Inside the
guide loop the signal is positive and the strength
subsequently diminishes the farther away from the wire
6 - Product and installation 1595 - 001 - 01.02.2021

you get. Outside the guide loop, the signal is negative
and the strength of the signal diminishes more rapidly.
Note: The product always tracks the left side of the
guide wire when facing the charging station, i.e. the
product follows the negative values on the guide signal.
CAUTION: Do not lay the guide wire at 90°
angles or less. Lay the wire in two 135° angles.
135º
135º 90º
3.6 Charging station
The placement of the charging station must be well
planned in order to give the best installation and
operation of the product. Refer to
Installation - To
examine where to put the charging station in the
Operator’s Manual.
Note: The battery is spared if charged in the lowest
possible ambient temperature. Consequently, it is
beneficial if the charging station is placed where it is
shaded, especially during the warmest parts of the day.
When the battery level has dropped to 600 mAh or the
battery voltage has dropped to 17.5 V, the product shuts
down the cutting motor and starts searching for the
charging station.
3.7 Circuit boards and sensors
There are several types of sensors in the product:
2
1
1. Front sensor circuit board (front loop sensor and lift
sensor)
2. Main board (rear loop sensor, tilt sensor, STOP
sensor)
CAUTION: Some sensors consists of a Hall
sensor and a magnet. Since the magnets have
a south and a north pole, it is important that the
magnet is fitted correctly.
Note: There are no sensors for collision in the product.
Collision detection is registered from the power variation
of the wheel motors.
3.7.1 Tilt sensor
The tilt sensor is a sensor on the main board that
detects the product’s inclination in relation to the
horizontal plane. The X-angle indicates front to rear
inclination, and the Y-angle indicates left to right
inclination. The value from the tilt sensor is used, among
other things, to correct the speed of the drive wheels
when mowing in steep slopes.
3.7.2 Lift sensor
The lift sensor detect if the product is being lifted off the
ground. This is done with the help of the mechanical
design and magnets. If a lift signal is indicated, the blade
disc stops immediately. The product tries extrication
maneuvers by reversing and turning several times.
3.7.3 Loop sensor
The loop sensor measure the signals that the charging
station sends through the boundary loop (A signal), the
guide loop (Guide signal) and the baseplate (F signal).
The signals are used to control the product and keep the
product inside the work area. The product can only
detect the signals if it has been paired with the charging
station. Refer to Loop signal on page 30 .
3.7.4 STOP sensor
The STOP sensor detects if the STOP button is pushed
down. If the STOP signal is indicated, the product and
the blade disc stop immediately.
3.8 To do a test of the installation
Note: Turn off ECO mode before you do the tests.
With the Lawn coverage test you can do a test of the
selected installation settings.
3.8.1 Test: Lawn coverage
The Test: Lawn coverage function is used to test if the
product can follow the guide wire or the boundary loop
at the selected corridor width out from the charging
station.
The Test: Lawn coverage can also be used to measure
the distance from the charging station to a remote area.
The distance, stated in meters, is shown in the app
1595 - 001 - 01.02.2021 Product and installation - 7

when STOP is pressed. How to do the test is described
in the Operator's manual.
3.9 SensorControl/LawnSense
Note: SensorControl for GARDENA® and LawnSense
for Flymo® are the same function.
When SensorControl/LawnSense is activated, the
product automatically adjust its mowing times based on
how fast the grass grows. This is decided by
continuously measuring the blade disc resistance and
comparing that to a mean value. If the resistance is
higher than the mean value, the product is allowed to
work for a longer time, and the other way around. The
mean value is continuously updated and whenever the
mower has collected enough data, the weather timer will
start affect the mowing time.
Note: The mean value will be reset if the settings are
reset.
The SensorControl/LawnSense does not make the
product work more than the timer settings, only less.
The product will always perform at least one mowing
cycle per day, only after that the mowing time is reduced
by the SensorControl/LawnSense.
3.10 Safe operation in slopes
The product adjusts its operation automatically based on
factors such as the slope angle and travel direction.
If the slope is too steep, the product moves rearwards
and turns to try to find a less steep slope. If after 2
attempts the product cannot find a less steep slope, it
stops and the product indicates that the stop is caused
by a steep incline.
Slopes that exceed the specified maximum inclination
can normally only be reached in very favourable
conditions. Accessibility on steeper slopes than
specified cannot be guaranteed.
3.11 New loop signal
In rare cases, there may be a reason to change the loop
signal. For example, if two nearby installations have the
same loop signal they can interfere with each other.
1. Select a new loop signal via the app.
Note: A new loop signal has to be generated when the
product returns to its ordinary charging station, for
example after service if a charging station other than the
customer’s has been used. Refer to Actions on page
10 .
8 - Product and installation 1595 - 001 - 01.02.2021

4 Autocheck service tool
Autocheck 3 is a PC tool developed for the service of
the robotic lawn mowers from Husqvarna Group. It is a
tool for troubleshooting as well as a database of sold
products and service history. Autocheck also includes
technical documentation and service bulletins.
Autocheck 3 supports all G3 (Generation 3) and G4
(Generation 4) products. Autocheck EXP is still
applicable for G2 (Generation 2). Autocheck 3 is
regularly updated with new functions and appearance.
The product is connected to the computer using short-
range Bluetooth® or a USB service cable.
4.1 Installation and login
Autocheck 3 supports Windows OS 7 and later.
Compatibility with other operating systems cannot be
guaranteed.
4.1.1 Getting log in credentials
The log-in credentials determine the set of capabilities
available within Autocheck 3.
To get Autocheck log-in credentials, either contact your
local sales support, or order Autocheck through the
Dealer Portal (requires access).
Note: Distributors can request access to Autocheck
through the Husqvarna IT service portal. Access to
Husqvarna IT service portal can be ordered through the
Husqvarna sales representative.
4.1.2 Installing Autocheck 3
Autocheck 3 is available for downloading from the
manufacturer's support site.
1. Select AFTER SALES – Autocheck 3 follow link to
SW installation .
2. Download Autocheck 3 according to the instructions
on the Support site.
3. Run the installation file.
4.1.3 Log in to Autocheck 3
1. Start Autocheck.
2. Enter your username and password, refer to Getting
log in credentials on page 9 .
Note: At the first log-in after installation, Autocheck
requires access to internet for user and password
validation.
4.2 Product connections
The product can be connected to Autocheck with both
Bluetooth® and USB service cable. Tests and firmware
updates are available with both connection methods.
USB service cable connection is faster and
recommended to use.
4.2.1 To connect the product with USB service
cable
1. Remove the rubber plug.
2. Connect the service cable between your computer
and the product:
3. Start Autocheck on your computer.
4. Switch on the product with the ON/OFF button.
5. After finishing the work in Autocheck, disconnect the
cable.
6. Install the rubber plug.
CAUTION: Make sure that the rubber plug
seals fully to prevent moisture inside the
product.
Contact between Autocheck and the product is usually
established automatically and confirmed through the
product's unique identification number.
If contact with the product has not been established:
• Check that the cable is correctly connected both in
the computer and in the product.
• Check that the ON/OFF button is switched on.
4.2.2 To connect the product with Bluetooth®
1. Start Autocheck on your computer.
2. Switch on the product with the ON/OFF button. The
product is now pairable through Bluetooth® for 3
minutes.
3. The product automatically appears in the list of
found devices.
4. Press the Connect button for the intended device.
The connection between Autocheck and the product
is established automatically. The connection is
confirmed on the Autocheck Home screen.
If contact with the product has not been established:
1595 - 001 - 01.02.2021 Autocheck service tool - 9

• Make sure that Bluetooth® is enabled on your tablet/
device.
• Switch off the product and then switch it on again
and try again. Refer to number 1-4 above.
4.3 How to use Autocheck 3
The program’s main functions are grouped in a number
of menus.
• Home
• Auto test
• Manual test
• Firmware
• Actions
• Log book
• Documents
• Customers
• Help
• Settings
4.3.1 Home
When the product is connected to Autocheck an
overview is presented in the Home menu.
Recommended actions are also shown, for example
recommended firmware updates.
4.3.2 Auto test
Auto test is suitable to use for a fast and overall status of
the product. In the Auto test menu you can select or
deselect tests. All tests run in a sequence after you push
Start Auto test . During the tests there are animations
guiding you what to do.
After the Auto test the results are presented in a list.
When clicking on a test there is more information
presented on the screen. It is also possible to print a
report of the test result.
4.3.3 Manual test
When using the Manual test you select, start and stop
the different tests by yourself. The result is shown live
on the screen and there are no test reports available.
Manual test is appropriate to use when you want to test
a specific component and allow it to work for a certain
period.
4.3.4 Firmware
In the Firmware menu Autocheck updates the product
firmware if necessary.
CAUTION: Always let Autocheck complete a
started programming process. An interrupted
programming can block the main circuit board.
4.3.5 Actions
The
Actions menu shows:
• Reset : Contains reset functions, for example Reset
charge cycles counter and Reset period time . Reset
charge cycles counter should be done when the
product has a new battery. Reset period time should
be done before the product is returned to the
customer (if there is a need to create a new loop
signal between the product and the charging
station).
• Unit replacement : Has the functionality to set the
product serial number if the main circuit board is
exchanged.
• Advanced mower settings : Contains additional
functions like Demo mode and Override loop
detection . It is also possible to get the Security code
from the product.
4.3.6 Log book
The Log book contains the Fault memory where, for
example, the product's error codes can be found.
4.3.7 Documents
When a product is connected to Autocheck, only the
relevant technical documentation for that model is
shown. It is however possible to uncheck the box for the
connected product and search for all available
documents in Autocheck, for example spare parts lists,
service bulletins, workshop manuals and operator's
manuals.
4.3.8 Customers
In the customer's menu a list of all the customers and
their products is available. The list is only saved locally.
It is possible to import, export and merge customer lists.
This can be used if you have a number of computers in
your organization.
4.3.9 Help
Here you can find more information about how to use
Autocheck. There are also Frequently Asked Questions
(FAQ), instructional videos and release notes.
4.3.10 Settings
Here you can enter dealer information, change
language, set date format and unit format. To apply the
new language or time format Autocheck must to be
restarted.
4.4 Programming a new main circuit board
If the main circuit board is replaced, the new main circuit
board must be programmed. The main circuit board
includes information about the product’s serial number.
Note: A new main circuit board may for safety reasons
only be assigned one serial number which is never
changed. It is therefore very important that the new main
board gets the correct serial number.
There are 3 options when programming a new main
circuit board:
•Select product from the Log book
10 - Autocheck service tool 1595 - 001 - 01.02.2021

Select product from the Log book and the serial
number and operating data is transferred
automatically to the new main circuit board. This
requires that the product previously has been
connected to Autocheck.
•Enter the serial number manually in Autocheck
If the product never was connected to Autocheck,
the serial number must be entered manually in the
Actions - Unit replacement menu. It is then very
important to enter the correct serial number.
•Use Service mode
If the main circuit board is replaced when
troubleshooting, and you are not sure if the main
circuit board will be kept in the product, it is possible
to temporarily skip to enter the serial number and
use the main circuit board in a so-called Service
mode . Only Autocheck can be used to control the
product in service mode.
WARNING: Do not return the product to the
customer in Service mode .
4.5 Demo mode
Demo mode is used for installations in shops or
exhibitions. The blade disc does not rotate and the
product alternates between short periods of operation,
docking and charging. Demo mode can be enabled and
disabled in Autocheck or with the keypad.
WARNING: Do not have blades installed when
the product operates for demonstration in public
areas such as shops and exhibitions.
4.5.1 To set the Demo mode using the keypad
1. Push the STOP button.
2. For GARDENA®: Push the Start button and the
Start/Schedule button simultaneously for 3 seconds.
3. For Flymo®: Push the GO button and the GO/
Schedule button simultaneously for 3 seconds.
4.6 To recover the PIN code
1. In Autocheck select Actions > Advanced mower
settings > Get security code to upload the security
code to the cloud.
2. Speak to the local sales support and tell them the
serial number. They can then identify the correct PIN
code.
Note: The PIN code will be with numbers 1-4 where
1 is the ON/OFF button, 2 is the Start/Schedule
button, 3 is the Start button and 4 is the Park button.
1595 - 001 - 01.02.2021 Autocheck service tool - 11

5 Repair instructions
This chapter describes how to repair and change spare
parts. Refer to the Illustrated parts list (IPL) at the
manufacturer's support website.
5.1 The body system
The body system differs between the models, both in
design and which parts that are included. The body
system is structured mechanically around the following
modules:
1
4
2
3
1. Top cover
2. Body
3. Rear bumper
4. Torx 20
5.2 The upper chassis
The upper chassis is structured mechanically around the
following modules:
4
32
1
5
1. Upper chassis
2. STOP button
3. Keypad
4. Front wheels
5. Body suspension parts
5.3 The lower chassis
The lower chassis is structured mechanically around the
following modules:
2
1
1. Lower chassis
2. Rear wheel
Note: There is a sealing strip between the upper and
lower chassis. Always replace the sealing strips when
the product is opened.
12 - Repair instructions 1595 - 001 - 01.02.2021

5.4 The cutting system
The cutting system is structured mechanically around
the following modules:
1
2
1. Cutting module
2. Blade disc
5.5 To mount screws
It is important to mount the screws correctly. Incorrect
mounted screws may harm the product. The screw
dimension is Torx 20 when there is no other information.
Note: Read the section about how to mount screws in
plastic before starting any maintenance. Refer to To
mount screws in plastic on page 20 .
Note: Always use the recommended torque to mount the
screws. Refer to Screw fasteners on page 22 .
5.6 To remove and install the body system
CAUTION: Clean grass and dirt from the
product before you disassemble it.
Note: This section describes how to disassemble all
parts of the body. For service or changing of spare parts
all steps may not be needed.
1. Push the ON/OFF button to disable the product. The
product is disabled when the indicator lamp is not lit.
2. The top cover is attached to the body by clips. Pull
the top cover up clockwise by hand and remove it.
3. Put one hand on the upper chassis and remove the
rear part of the body with a fast and short pull.
4. Locate the 2 positions where the body system is
attached.
1595 - 001 - 01.02.2021 Repair instructions - 13

5. Push the special tool down in 1 of the 2 positions,
and pull the body up.
6. Continue with the other position while holding the
body up.
7. Lift up and remove the body.
8. Install in the opposite sequence.
5.7 To remove and install the lower chassis
1. Turn the product up side down and put it on a soft
and clean surface to prevent damage to the product.
2. Remove the 10 screws.
3. Lift the lower chassis carefully.
4. Disconnect the cable from the battery from the main
board.
CAUTION: Always disconnect the power
cable first to prevent current spikes that may
harm the circuit boards or the battery.
5. Disconnect the cable for the cutting motor from the
main circuit board.
6. Install in the opposite sequence.
CAUTION: Replace the sealing strip every time
you assemble the lower chassis. A used sealing
strip does not provide a satisfactory seal.
5.8 To remove and install the upper chassis
1. Remove the body. Refer to To remove and install
the body system on page 13 .
2. Remove the lower chassis. Refer to To remove and
install the lower chassis on page 14 .
3. Remove the STOP button. Refer to
To remove and
install the STOP button on page 15 .
4. Remove the body suspension parts. Refer to To
replace the body suspension parts on page 18 .
5. Remove the front wheels and the wheel motors.
Refer to To replace the wheel motor on page 19 .
6. Remove the main circuit board. Refer to To replace
the main circuit board on page 16 .
7. Remove the front sensor circuit board. Refer to To
replace the front sensor circuit board on page 15 .
8. Remove the battery. Refer to To replace the battery
on page 17 .
9. Install in the opposite sequence.
14 - Repair instructions 1595 - 001 - 01.02.2021

5.9 To remove and install the STOP button
1. Remove the body. Refer to To remove and install
the body system on page 13 .
2. Use a flat screwdriver to loosen the 2 clips.
3. Tilt the rear end of the STOP button.
4. Pull the STOP button rearward and remove it.
5. Install in the opposite sequence.
5.10 The circuit boards
These are the circuits boards in the product:
• Main circuit board
• Front sensor circuit board
The circuit boards contain the electronics and software
required to control the product's functions.
The main circuit board contain firmware. If the main
circuit board is replaced, new firmware must be installed
from Autocheck.
The front sensor circuit board do not have any software,
and do not need to be programmed after a replacement.
CAUTION: Pull the connector and not the cable.
CAUTION: Always prevent damage to the
product from electrostatic discharge, ESD,
before you start to do work on electrical
components.
CAUTION: Do not touch the circuit board’s
components or pin terminals.
5.10.1 To replace the front sensor circuit board
CAUTION: Some sensors consists of a Hall
sensor and a magnet. Since the magnet have a
south and a north pole, it is important that the
magnet is oriented correctly.
The front sensor circuit board contains the front loop
sensor and the front lift sensor. The sensors cannot be
replaced separately. The entire front sensor circuit board
must be replaced as a unit.
1. Remove the lower chassis. Refer to To remove and
install the lower chassis on page 14 .
2. Remove the screw and the bracket.
1595 - 001 - 01.02.2021 Repair instructions - 15

3. Pull up the front sensor circuit board.
4. Disconnect the cable to the front sensor circuit
board.
5. Install in the opposite sequence.
5.10.2 To replace the main circuit board
The product's operating information is stored in the main
circuit board. The Autocheck service program saves this
information in the log book and then transfers it back to
the product again when the main circuit board has been
replaced.
1. Connect the product to Autocheck before replacing
the main circuit board. The operating data is then
saved automatically.
2. Remove the lower chassis. Refer to
To remove and
install the lower chassis on page 14 .
CAUTION: Always disconnect the power
cable first to prevent current spikes that may
harm the circuit boards or the battery.
3. Disconnect the cables from the main circuit board.
4. Remove the 2 screws.
5. Push the two clips and remove the main circuit
board.
CAUTION: If the board is to be checked in
order to evaluate the warranty, it should be
placed in a bag with protection against ESD
(electrostatic discharge).
6. Install in the opposite sequence.
7. Connect the product to Autocheck. Select the
correct serial number in the log book. Autocheck
automatically transfers the operating information
saved in the log book.
8. If the current product for any reason is not in the log
book in Autocheck, the serial number must be
entered manually. The serial number is printed on
the rating plate on the body below the top cover.
CAUTION: Check that the correct serial
number is entered. It can only be entered
once.
16 - Repair instructions 1595 - 001 - 01.02.2021

9. If the main circuit board is replaced when
troubleshooting and you are not sure if the new main
circuit board will be kept in the relevant product, it is
possible to temporarily program the main circuit
board in a so-called Service Mode. Refer to
Programming a new main circuit board on page 10 .
5.11 The battery system
WARNING: Use only original batteries
recommended by the manufacturer. Product
safety cannot be guaranteed with other
batteries. Do not use non-rechargeable
batteries.
The battery is considered to be fully charged when the
battery reaches 80% of the total capacity. To charge the
battery to 100% would take too long since the charging
current is low. The most rational way of using Li-ion
batteries is therefore to stop charging at 80%. The
maximum utilised capacity is thus 80% of the battery’s
total capacity.
The battery is maintenance-free, but has a limited life
span. The battery is expected to last for 3000 - 4000
charging cycles. The normal charging current is 1 or 1.3
A.
5.11.1 To replace the battery
1. Remove the lower chassis. Refer to To remove and
install the lower chassis on page 14 .
2. Disconnect the battery cable from the main circuit
board.
3. Remove the screw for the bracket.
4. Remove the battery.
5. Install in the opposite sequence.
Note: When replacing the battery, the charging cycle
counter should be reset. This is done in Autocheck.
5.11.2 To replace the charging plates on the
product
When the product’s battery does not recharge this may
be due to worn or damaged charging plates.
The charging plates are included in the main circuit
board. Refer to To replace the main circuit board on
page 16 .
1595 - 001 - 01.02.2021 Repair instructions - 17

Also check the contact plates on the charging station.
Refer to To replace the charging tower on page 20 .
5.12 To clean and replace the ventilation filter
Note: The ventilation filter needs to be cleaned regularly
and must be replaced if damaged.
1. Remove the body. Refer to To remove and install
the body system on page 13 .
2. Remove the STOP button. Refer to
To remove and
install the STOP button on page 15 .
3. If the filter is not damaged. Clean the filter carefully
with a clean and soft brush and move to step 7.
4. Remove the damaged filter.
5. Clean thoroughly around the mounting surfaces.
6. Apply the new filter, ensuring the adhesive surfaces
fasten properly to the chassis.
7. Install in the opposite sequence.
5.13 To replace the body suspension parts
1. Lift up the body suspension parts by using a small
flat screwdriver. Pull the screwdriver gently
backwards.
2. Put the screwdriver between the suspension system
and the lower chassis. Push the screwdriver
upwards and remove the suspension part.
3. To assemble the body suspension parts, install the
pin into the slot and install the ring into the correct
position.
4. Push the body suspension part into the hole in the
lower chassis.
5. Install in the opposite sequence.
5.14 To replace the keypad
1. Remove the lower chassis. Refer to
To remove and
install the lower chassis on page 14 .
2. Disconnect the cable to the main circuit board.
3. Remove the keypad from upper chassis.
Note: The keypad is glued to the upper chassis.
4. Clean the chassis from glue residue.
5. Remove the protective liner from the new keypad,
and press the keypad into position.
18 - Repair instructions 1595 - 001 - 01.02.2021

CAUTION: There must not be any loose
corners or air bubbles as this can cause dirt
and moisture to get in under the keypad.
6. Reconnect the new keypad to the main circuit board.
7. Install in the opposite sequence.
5.15 To replace the cutting module
1. Remove the lower chassis. Refer to
The lower
chassis on page 12 .
2. Remove the 2 screws for the blade disc.
3. Remove the 3 screws for the cutting motor.
4. Lift up and remove the cutting motor.
5. Install a new cutting motor.
6. Install in opposite sequence.
CAUTION: Make sure that the gasket seals
properly.
5.16 The wheel motors
The 2 wheel motors are brushless DC motors. The
motors are supplied as a unit together with gearbox,
wheel motor end cover, gasket, hub and cable.
Right and left wheel motors are identical and have the
same article number as spare parts. The motors have to
be replaced if they are faulty.
5.16.1 To replace the wheel motor
1. Remove the upper chassis. Refer to To remove and
install the upper chassis on page 14 .
CAUTION: Always disconnect the power
cable first to prevent current spikes that may
harm the circuit boards or the battery.
2. Disconnect the wheel motor cable from the main
board.
3. Remove the hub cap using a flat screwdriver.
4. Remove the nut and washer holding the wheel in
place and remove the wheel.
5. Remove the wheel motor by loosing the 4 screws
(Torx 20) in the wheel motor bracket.
6. Fit the new wheel motor and fasten the screws (Torx
20) with the recommended torque.
7. Install in the opposite sequence.
1595 - 001 - 01.02.2021 Repair instructions - 19

5.16.2 To replace the rear wheel
1. Turn the product up side down and put it on a soft
and clean surface to prevent damage to the product.
2. Push the 2 clips and pull the rear wheel up.
3. Install in the opposite sequence.
5.17 To replace the sealing strips
There is a sealing strip between the upper chassis and
lower chassis in the product.
CAUTION: A 5 mm sealing strip must be used.
Sealing may be deficient if the wrong sealing
strip is used.
1. Start by laying one end of the sealing strip in line
with the marking on the chassis.
2. Continue laying the sealing strip clockwise around
the lower chassis.
3. Lay the other end of the sealing strip above the first
end and then out of the channel. Fasten the sealing
strip in the retainer.
5.18 The charging station
5.18.1 To replace the charging tower
The charging tower consists of the contact plates and
the charging station's circuit board. These cannot be
replaced separately. The entire charging tower must be
replaced as a unit.
When the product's battery does not recharge or cannot
contact the charging station, this may be due to worn
contact plates in the charging station. Also check the
charging plates on the product.
1. Disconnect the power supply.
2. Disconnect all cables from the charging station.
3. Release the 2 clips with a flat screwdriver and pull
up the charging tower.
4. The cap is attached with one clip. Remove it by
gently lifting one side of the cap.
5. Fit the cap to the new charging tower.
6. Refit the charging tower on the baseplate.
7. Connect all cables to the charging station.
8. Connect the power supply.
5.19 To mount screws in plastic
CAUTION: If the screws are mounted
incorrectly, there is a risk of damaging the
threads in the plastic and thereby shortening the
20 - Repair instructions 1595 - 001 - 01.02.2021