These are instructions for the AI-900AF, which allowed external speakers to be connected to an AI-900 Series system.
Note: This system has been discontinued. Technical and repair support are no longer available. These instructions are intended to assist with troubleshooting existing systems and analyze existing wiring during system upgrades. To discuss upgrade options with your local sales representative, see the contact information at this link: https://www.aiphone.com/sales/regional-sales