GAI-Tronics 751-901 SmartSeries Speaker Amplifier - Manual (Page 5)

Pub. 42004-659L2F
751-901 SmartSeries ® Speaker Amplifier P AGE
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Block Diagram
The P1 connector on the rear of the Speaker Amp/Power Supply PCBA plugs into the socket in an
enclosure connected to the system cable, accessing the Page/Party
® lines and ac power. Refer to Figure 3.
The Speaker Amp/Power Supply PCBA contains the low voltage power supplies and the speaker
amplifier circuitry.
Connector J1A and J1B on the Speaker Amp/Power Supply connects regulated +5 V dc, +/−15 V dc, and
V
RLY
voltages along with control, monitoring, and line signals to the J1A and J1B on the FSK/
P PCBA.
Connector J2 of the Speaker Amp/Power Supply PCBA connects to optional external devices.
Figure 3. Block Diagram
Interfaces
The assembly interfaces to the system cable, an external loud speaker, and auxiliary devices via P1, a
16-pin connector. All connections to the system cable are made by qualified installation technicians
during the system installation. Direct questions about these connections to the GAI-Tronics Field Service
Department at 800-492-1212 inside the USA or 610-777-1374 outside the USA. Other connections on
the Speaker Amp/Power Supply PCBA provide quick connect/disconnect of subassemblies.
Connector J2 on the bottom of the Speaker Amp/Power Supply PCBA connects to optional devices such
as the SmartSeries
® RTU installed in specially designed enclosures.