Hey there,
i have a b&g zeus 2 board here which works fine, except a complety non functional CAN-BUS/NMEA2000 System.
Bus Diagnose Shows BUS-OFF and 255 TX Errors.
I checked the CAN Transceiver (ON Semi AMIS 30660) and Isolator IC (ISO7221), all look fine but i do not have the proper Supply Voltages.
12V Comes in via a small 3 pin Transistor(?) and then through a standard 7805 regulator.
i see 7805 IN 2.7V and OUT 1.2V. so i assume we have some power issue here.
Close to the 7805 i see a burned Resistor, but cant identify any possible value. 4009? Would be way to much i guess.
Resistor currently measures 15kOhms.
Thanks for any educated guess

Max