GAI-Tronics 723-905 User Manual - page 5
Pub. 42004-364C
Model 723-905 SmartSeries Remote Subset Amplifier
Page: 5 of 13
f:\standard ioms - current release\42004 instr. manuals\42004-364c.doc
03/11
Block Diagram
The P1 connector on the back of the Speaker Amp/Power Supply PCBA plugs into a socket in an
enclosure connected to the system cable, accessing the Page/Party
®
lines and ac power. 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 Handset
Amp/FSK/
µP PCBA. Connector J2 of the Speaker Amp/Power Supply PCBA connects to optional
external devices.
The Handset Amp/FSK/
µP PCBA has connections to the handset and the hookswitch via spade terminal
connectors E1 to E7, and it connects via J3 (connector) attached to the pigtail on the Speaker Amp/Power
Supply PCBA.
Figure 3. Remote Subset Amplifier Block Diagram