Automower 220AC no loop signal

[Plexi]

Sorry if I write in English,
after winter recovery the robot does not get any signal from the charging station.
Green led is ON
Checked with AM receiver ,the radio signal is there.
All values of loop sensors at 0 : AR AF and quality .
That leads me to a defective board in the charging station ,but the green light and radio signal present make me doubtfull.
by the way ,try to change PIN ,but no contact with the station
done a factory reset with no avail.
I do not have any other idea
Could be the main board on the robot ?
Thanks for your kind interest
Mauro

[Razmoket]

Hi

I already repaired plenty of motherboard, but I did never encounter a problem related to loop detection. However, it can happen.
There's an easy check for Base station: if you disconnect the boundary wire, the green led should blink. If it does, the base board is probably OK.

Another important item : does the mower detect a signal near the base (N and F signals)?

I can have a look at your motherboard. Send me then a message via the forum messaging system.

[Plexi]

Hi,
no N and F signal ,all 0.
When i disconnect the boundary wire the led blinks.
Mauro

[Razmoket]

If the led reacts to boundary situation, it means the Base is probably OK. As F and N signals are generated in a different circuit, it means also, that a problem on the base is unlikely.

On the motherboard, loop signals circuitry is located on the edge, with 2 TTL circuits, one double op-amp and one LDO. This is where to look at...

[Plexi]

Solved
it was a faulty mainboard.