Technical data

Series SPB Audio Boosters Manual, Revision A
6-1
6 Operational Procedures
The Series SPB Audio Boosters do not have specific operating instructions. When the Audio
Booster is properly connected to the voice evacuation panel, it automatically functions properly
unless there is a trouble condition. Under normal operation, the green AC LED indicator (D11) is
ON, and the yellow TROUBLE LED indicator (D73) is OFF.
• The TROUBLE and AC LED indicators identify the condition of the Series SPB Audio
Booster. The yellow TROUBLE LED indicator is ON whenever there is a trouble
detected by the panel. If no troubles are detected, the green AC LED indicator is ON.