DS-540 (Camper) incorrect battery voltage

[Sunnyalex]

Hello people,

this is a desperate call for help.

I have a camper/caravan. It is from 2003. The entire electrical system is controlled by a pixsys control board with Motorola 68HC11 Microcontroller.
The pixsys board is placed inside a "relay box" type DS-540-HY, which comes from "CBE".

The issue is: the info display shows incorrect battery voltage. It shows <2 V for both battery circuits, where both batteries are fully charged (14 V).

Therefore, the control software goes into "battery protection mode" and deactivates all relays for all load circuits (e.g. lighting, water pump etc.).

Is there anybody who is familiar with that old system?

Are schematics of the PCB available?
Or signal tables for the RS-485 bus between the relay box and the HMI panel?
Are spare parts available?

I did some measurements on the pixsys board but did not find any issue (main 5 V regulator works, 2.5 V reference works).

I would be glad for any feedback.
Alex

[Pixsys tecnico 1]

Hi,
please contact CBE directly, we cannot provide information for custom boards.

[Sunnyalex]

Hi,
please contact CBE directly, we cannot provide information for custom boards.

Thank you for your message. Do you perhaps know somebody from CBE which I can contact directly?
Because I have tried to contact them already via their contact form on the website. However, the only feedback I received was that I should visit a local dealer/repair shop.

My local dealer just said that they cannot repair it, instead they would replace the entire electrical system in my camper (to the new CBE electronics generation). Or alternatively they would send the (probably) defective control board to CBE, but it might take 3 months to receive any feedback if it's broken and repairable.

As you might imagine, both of these options are not satisfying.

[Pixsys tecnico 1]

Have you already tried to write to

assistenzatecnica@cbe.it

or

info@alko-tech.com

?