Few members requested internal pictures.
This seems to be one of the latest E5810A according to serial number. Noticeable difference is power resistor mounted to cover connected to internal switching power supply.
Power supply check seems to be OK ( 5V,3V3,2V5).
P602 is RS232 port, P101 is GPIB port.
Any tips what can be P701 or function of jumpers P703 or P601?
USB does not have VIP/PID so it is completely disabled.