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TROUBLE SHOOTING
Circuitboard with CPU
The circuitboard together with the CPU (microprocessor) are
the lawn mower’s “brain“ and handle all functions, commands
and path selections the lawn mower decides on, based on the
input data provided by the keyboard, sensors, solar panels,
microswitches (collision detectors) and the batteries charge
status.
To check whether an operating disruption is due to an error in
the microprocessor start by resetting it 3 times (preceded by
charging in daylight for at least 1 hour). That is, remove and
reconnect one of the batteries connectors 3 times, allowing 5
seconds to elapse in between.
Also check that the fuses on the circuitboard have not blown
and that they make good contact in the fuse holders. Replace
fuses carefully.
The voltage between the fuses and the earth can also be
measured and should be the same as the actual battery
voltage. (The main power switch in position “1“.)
I
f this does not solve the problem you can try replacing the
microprocessor with a microprocessor that you know functions
correctly. The processor must be lifted out using the processor
tool, otherwise there is a large risk of damaging the processor
pins.
NOTE! All work on or in connection with the circuitboard
must take place with the batteries disconnected to avoid
short circuiting. Static electricity can also damage the
microprocessor.
Buzzer
The lawn mower has a buzzer on the outside of the box that
generates a beep, which the machine uses to interact with the
user. The buzzer's volume can be adjusted using B0 - B9,
where B9 gives a louder signal and B0 mutes the buzzer. If
these setting have no effect on the volume, try replacing the
buzzer. Connect 12 V DC to the buzzer to check whether it
functions; it should sound.
There is also a buzzer on the circuit board, which has a fixed
volume. If you wish the machine to be completely silent this
must be blocked. This is done by pressing silicon into the hole
on the top of the buzzer. Note this will also mute the beep heard
when pressing the keys.
Main power switch
The main power switch ensures that the lawn mower does not
start when it is switched off. The code must be entered in the
lawn mower every time the main power switch has been
switched off, even some commands are reset (see the Opera-
tor's Manual). Note that the switch does not cut the voltage from
the batteries and solar cells. Accordingly, the batteries' connec-
tion cables should be disconnected when working inside the
box and during the winter storage period.
The main power switch can be checked by measuring its
resistance. The resistance should be 0 ohm respective infinite
resistance depending on the position of the switch.
Magnetic switch
The magnetic switch is located by the hinge between the front
and rear solar panel halves and ensures that the lawn mower
does not start until the rear solar panel has been lowered.
The magnetic switch can be checked by putting the power
switch in the “on” position and then lowering the rear solar
panel. When this is done a click should be heard from the relay
on the circuit board and the machine indicates “start-up” (1
beep/second) for 10 seconds. If you hear this the magnetic
switch functions correctly.
If the “start-up” does not start, temporarily strap the connection
screws on the magnetic switch. If the “start-up” now starts the
magnetic switch is defective.
For information on how to replace the magnetic switch refer to
service notice tab 5, 96.016.
When trouble shooting, a microprocessor with the article
number 535 04 90-01 can be used, all have the code “A 00000
B“. This microprocessor shall only be used for trouble shooting
and repair work.
All other trouble shooting (in addition to replacing the
circuitboard) consists of checking that connectors and cables
are connected correctly on the circuitboard, even dampness
and dust can result in faults, which is why cleaning with a dry
brush and drying indoors can solve basic problems with short
circuiting. Ocular inspection can also reveal the reason for a
fault.
Eng-SOL VERK 98-01-15, 10.079