You have the configuration pin off right?

It wouldn't be the first time a person has placed the configuration pin on to set the tank parameteres and then forgot to remove it. The DBC2 and 3 are identical except the 2 uses a channel for servo recoil, and the 3 uses that as an interface with the Benedini sound system.

You can send the DBC back to me and I can check it out and return a functioning one. I think it is fair to say this chip has been exposed to some creative wiring<grin>