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“.)
If 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.
When trouble shooting, a microprocessor with the article number 535 04
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.
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
If the
For information on how to replace the magnetic switch refer to service notice tab 5, 96.016.
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