To use this Studer card, first make sure your D21m Modular I/O System is powered off. Then carefully insert the card into the appropriate slot. When connecting your microphones or line - level devices, use the four available analog inputs. Remember to double - check all connections to ensure they are secure. As for maintenance, keep the card in a clean and dry environment. If there is dust on it, use a soft, dry cloth to gently wipe it. Also, don't expose the card to extreme temperatures or humidity. If you encounter any issues, refer to the system's user manual or contact Studer support.